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Friday, December 24, 1997

It was just past 8 o'clock in the morning when Matt woke up. He'd been hoping to catch up on some sleep while his cousin, aunt and uncle were visiting for Christmas; he'd thought it would be a break from the nightly disruptions to his sleep schedule caused by his sister Jennifer for the past month. But given what happened yesterday with his aunt Lindsey and cousin Ellie, catching up on sleep over the next few days seemed a lot less likely.

The short-statured Shire horse stretched his legs, his hooves not even reaching the far armrest of the sofa he'd been sleeping on. With one eye half-opened he could see the empty sofa where Ellie had slept. He was still tired and wanted to fall back asleep, but he could hear her and the rest of his family members chatting and the spoon-clinking sounds of breakfast coffee in the kitchen. They were in there and not in the living room out of courtesy to Matt while he was asleep, but he knew it wouldn't be long before they roused him if he didn't get up on his own.

He half yawned, half grunted as he stretched his arms and arched his back. He could feel, now, that his mostly-erect horse cock was up against his chest and underneath his shirt, which was not uncommon for him in the morning when he first woke up. He pulled down his pajama pants and redirected his massive shaft down one pant leg. He pulled his pants up, yawning one last time before throwing off the blanket. Time to get up.

Matt went upstairs to take a quick shower before joining his family for breakfast. He thought about jacking off in the shower to get rid of his morning wood, but by the time the water was hot he had gotten soft. It wasn't just what happened yesterday with his aunt and cousin; it was seriously like there was something in the air whenever he was near them that kept him rock hard. Ah well, he thought as he finished showering and dried off. Not worth worrying about.

He threw on some clean clothes from his drawers - another pair of plaid pajama pants and an old T-shirt - and headed downstairs towards the kitchen.

• -

"Good thing you stocked up on coffee creamer before we showed up. My two girls, they're addicted to the cream!"

Lindsey rolled her eyes as she poured more into her coffee mug.

"That's what they make it for, dear. I really don't know how you drink this stuff without anything in it," she said to her husband.

"Builds character," Bob said with a smile. He looked up from the stovetop he was standing over, cooking breakfast for everyone. "And speaking of 'character,' here's one now! Morning, sport!"

"Good morning Uncle Bob. Morning... everyone," Matt said, taking a seat at the kitchen table next to his cousin Ellie. She, her mom Lindsey and Matt's sister Jennifer were watching him intently as he pulled up his seat. Only his mom didn't have her eyes on him - she was staring down at the newspaper, pencil in hand.

"Morning Matt," his cousin, sister and aunt said, almost in unison.

"Like a Greek chorus! I didn't get a welcome like that and I'm the meal ticket! You'll have to teach me your secrets with the ladies someday!" Bob quipped. Lindsey rolled her eyes again, while Ellie blushed and Jennifer took a quick sip of coffee.

"Oh hey look, your shirts! You two are twins today!" Bob continued, pointing at Matt and Ellie before the mood became too awkward from his last comment.

Reflexively they both looked down. They were both wearing the T-shirts they'd gotten at the Shire family reunion they'd gone to years ago. The shirts had been way too big on them when they were little but were only slightly too big now, so they both wore them around the house and to sleep in. The shirts were unremarkable except for the words printed on the front in big, bold letters: 'Shires do it BIGGER ,' with the word 'bigger' in all caps and bold and 'do it' italicized in an exaggerated way.

They both smiled at Bob. They'd made way too many of the novelty shirts at the reunion and both families had a bunch of extras, so it wasn't too unusual to see one or two of them wearing them around the house at any given time.

"So... you finished that one yet mom?" Matt said to break one of the awkward silences Bob seemed to have a knack for creating.

"Hmm? Oh good morning dear!" Matt's mom said, looking up from the crossword puzzle she was working on. "Just about done with this one. One more to go before I can send them in."

"Send them in?" Lindsey asked.

"Mm-hmm! It's a contest the newspaper is running, Twelve days of Christmas thing. If you finish the crossword puzzles for the twelve days leading up to Christmas, you send them in and you're in the drawing for the prize!"

"No one ever wins those things..." Lindsey said dismissively.

"Always so cynical! I do the crossword every morning anyway, so why not? Plus I don't think they promoted it very well, and how many people do you think will actually finish the crossword for twelve days and send it in? So I figure I might actually have a pretty good shot," Matt's mom said.

"Sounds like a good plan to me. What's the prize?" Bob asked.

"Two tickets on all-expense paid Caribbean cruise!" She beamed.

"Two tickets? Who would you take if you won?" Ellie asked.

"You're not dating anyone..." Lindsey said, almost as an insult.

"What about Jennifer? Girls' adventure in the tropics, some mother-daughter bonding, that could be fun!" Bob interrupted, trying to soften his wife's jab at her sister, the single-mother.

"When is it?" Jennifer asked out of curiosity.

"Spring break week..." her mom answered, trailing up at the end to imply that the timeline would work.

"I mean... no offense mom but I can think of a couple things I'd rather do for spring break this year..." Jennifer said.

"Well then... what about Matt? You'll be off school at the same time, right?" Bob said.

"Yes sir," Matt answered.

"Bob, come on. He's a teenager now, he doesn't want to waste his spring break on a cruise with his mother," Matt's mom said.

"I don't have any spring break plans this year, actually. Probably just sitting around the house playing video games... I've never been on a cruise, could be fun. I'd be down for it," Matt said.

He'd said it without really thinking it through. His mom smiled at him, while Jennifer gave him dagger eyes. 'That would be a whole week where we wouldn't get to fuck, you idiot,' her look telegraphed to him.

"Well, if you'd really be okay spending spring break on a boat with your mom..." his mom said.

"Sounds like a date! You gotta teach me your secrets..." Bob joked.

Now Matt was blushing with embarrassment. He shifted in his chair - his erection was coming back again. Something in the air...

"Moot point, you're not going to win, those contests are rigged," Lindsey said, taking another sip of her cream-heavy coffee.

"Always the pessimist," Bob said.

"Balances out your eternal optimism," she said to her husband.

"And that's why we work so well together."

There were a few more seconds of awkwardness before Bob spoke again.

"So, any big plans for the day?" He said.

"I..." Ellie and her mom Lindsey said at the same time.

"I was actually gonna see," Ellie continued over her mom, knowing her time with Matt was limited, "if maybe after breakfast you might want to go exploring a little bit out in the woods behind the house? Like we used to when we were little. I was thinking about that old treehouse, is it still back there?"

"It should be, but I haven't been back there in years. Let's find out what's left of it after breakfast," Matt said. He thought he understood what Ellie was getting at - the two of them alone, away from everyone else in the house. Heck yes he was in for some 'exploring.'

"Well, don't you two spend too much time out there. Matt, I'm going to need your help with something today. After lunch," Matt's aunt said.

"Umm... sure Aunt Lindsey. What do you need?" Matt asked. After what happened between them yesterday he was leery about spending time with her, but he didn't feel like he could say no, especially if she was asking for something in front of the whole family.

"Well... to be totally honest, I haven't finished Christmas shopping..."

"Christmas Eve, honey. Gonna be a mad-house," Bob interjected.

"I can't take Bob because it will spoil the surprise, dear," she said at her husband, "and I need a strong stallion to help me carry some things."

"Why don't you take Jennifer, honey? She's stronger than..." Bob started.

"Why don't you_let _me decide who I need to help me dear..." Lindsey shot back. He had a point - Jennifer was definitely the biggest and strongest horse in the house. But the real point of the trip wasn't to shop for Christmas gifts. She had something else in mind, and if she was going to give Bob the gift she had planned for 9 months in the future she absolutely needed Matt.

"All right, fair enough," he acquiesced. "Anyhoo, who's hungry? Hot off the griddle, buns in the oven, breakfast's on!"

• -

"How long has it been since you've been back here?"

Matt thought for a moment, walking hand-in-hand with his cousin Ellie through the woods behind the house.

"Jeez, I dunno. I can't even remember. Maybe since me and you used to come back here. It's been a really long time," he said.

"Really? Never been back here with your sister?" Ellie asked, already knowing the answer.

"Definitely not! She's not into this kind of stuff or video games like us. She's more into... I dunno. Like, getting smashed at keggers with the football team and embarrassing herself. That's more of her thing."

They both laughed, squeezing each others' hand.

"Well she's been missing out. Going on adventures is the most fun thing! Especially when it's with you, Matty-doo."

She swayed her hips to the side, playfully bumping Matt so hard it almost knocked him over.

"Hey now, careful with that! You got some power in those hips you didn't have last time we were back here!" Matt said with a smile, regaining his balance.

"You saying I got a big butt, big meanie?" Ellie teased, turning around in her tight blue jeans to intentionally give her cousin a good look at her best feature, the lush black hair of her tail swishing to the side.

"Nooo, course not... but someone's gotta put the 'big' in 'Shire's do it bigger,'" Matt teased back.

"I'll show you how Shires do it!" Ellie yelled playfully.

Before Matt could react Ellie had tackled him down to the ground, and they were tussling like they used to when they were kids. Matt was able to grab Ellie's arm, but she turned around too fast for him to pin it behind her. She arched her back and wedged her leg between his. They rolled through the leaves a few times before stopping with Ellie on top of him, straddling his body. She had her hands around his wrists, pinning him to the ground.

"Your secret weapon, not fair! Your butt is too strong!!" Matt squealed playfully. He could probably throw Ellie off him if he tried, but he didn't much mind the position he now found himself in.

"Uh huh. Mighty Matt, defeated by a big mean butt," she said, leaning closer to him.

"How could I defend myself against something powerful? It's like your secret weapon."

"Hey now, I'm not the only one with a 'secret weapon.' Maybe not your butt, but something of yours has gotten 'bigger' since the last time we wrestled."

Ellie waited, but Matt didn't say anything. She could feel his 'secret weapon' through her blue jeans as she sat on him.

"Anyway, I won. The score is Ellie one, Matt zero. Now let's get to the treehouse," she said.

Matt didn't pick himself up off the ground for a moment even after Ellie rose to her hooves.

"Come on lazy bones! We don't have all day! I want to see if it's even still there," she said, looking down at him.

Soon they were back traipsing through the woods again, just like old times. They were almost running after each other towards the end, when they both knew the old treehouse in which they shared so many memories from their childhood was just ahead.

"There it is! Come on!" Ellie shouted back to Matt. She had been worried that after several years without any upkeep it might have suffered some damage, but it looked just like it did all those years ago, none the worse for wear.

Now they were climbing up the wooden slats nailed securely to the side of the enormous oak which led up to a trapdoor-style hatch on the underside of the treehouse. Matt was having difficulty focusing on the wooden slats, handholds and hoofholds, with Ellie's thick butt just above his head as she shimmied upwards.

Ellie reach the top of the improvised ladder and gave the wooden trap door a hard push upwards. The old hinges creaked loudly, the hatch swung up and open, and with a loud slap it hit the wooden floor on the other side. Matt closed his eyes and looked down as some dust sprinkled down onto him.

"Oh my god Matt!" Ellie exclaimed, peeking inside, "Matt look! Come up!"

Ellie lifted herself up into the treehouse and Matt could no longer see her as he climbed up the last few slats.

"What is it?" Matt asked just as he was pulling himself up over the ledge and into the treehouse.

"It's exactly the same, Matt! Nothing's changed!"

On top of her worries about natural degradation, Ellie had also been worried that over the past few years some other kids might have stumbled across the treehouse and ransacked it, stolen everything from inside, trashed the place. But that hadn't happened. Aside from a lot of dust and some dead leaves and pine needles that had blown inside, the interior of the treehouse was just as she remembered it when she'd left it for the last time as a kid.

"All our stuff is still here, look!"

On the far wall away from hatch was an antique toy chest. It was filled with all the superhero action figures they used to play with, plus an assortment of board games, baseballs, water guns, slingshots with rocks they had amassed to 'defend' the treehouse against imagined would-be attackers, along with a hefty pile of pine cones they stockpiled for the same purpose. There were no dolls or other 'girly' toys in the treehouse, those never appealed to Ellie.

They had also made a 'comics corner' in the far corner of the treehouse when they were kids, where they had spent countless hours hanging out and reading, talking, joking and laughing. There was an old shoe-rack that they had converted into a kind of bookcase for all the comic books they used to collect. Shoved in the corner were several old beanbag chairs and about a dozen old pillows, plus several blankets that were in remarkably good condition for being left in place for years. They'd spent more time than they could remember there, arguing the respective abilities and weaknesses of their favorite superheroes.

"Comics corner!" Ellie screamed with delight as Matt lifted himself fully into the treehouse and swung close the entry hatch behind him. He watched as she jumped headlong straight into the mound of pillows and blankets and beanbag chairs, just like she'd always done when they were kids. But she was a lot bigger than she was back then, and years of dust had accumulated on the pillows and blankets. A massive cloud of dust erupted from the pile when she flopped down onto it.

"Jeez," was all Matt said as he pulled up the hoodie he was wearing around his snout and face.

Ellie did the same with her 'Shires do it Bigger' shirt. It never got too cold down here, even in the winter. Unlike in the city far to the north where she lived, down here it never snowed. The temperatures rarely dipped even close to freezing. She'd gotten used to the colder weather since she'd moved away, so while Matt wore a hoodie she didn't feel the need for any winter clothes at all.

"So much dust! It's everywhere now," Matt said, his voice muffled from the hoodie over his face.

"Let's fan it out the window," Ellie said.

"With what?"

Ellie looked around, but then realized Matt was wearing the best tool for the job.

"Take off your hoodie and used that," she said.

"But it's cold," Matt said sheepishly.

"It is not cold, you big weenie! It's like, in the sixties."

"It was 55 degrees when we left the house, I checked the thermometer," Matt said.

"That's not cold!" Ellie exclaimed, equine snout still covered with her old T-shirt, not sure whether to laugh or not.

"Fine, fine, fine..."

Matt pulled off his hoodie with a single quick motion. Ellie stole a glance at his bare stomach for a moment as his identical T-shirt rose up with it for a moment. A moment later he had the hoodie in his hands and was fanning the dusty air out the window. But after just a few sweeps it was evident that this method wasn't terribly effective, and circulating the air inside the treehouse only seemed to be kicking up even more dust.

"You gonna help?" Matt said over his shoulder to Ellie, who was still laying on the pile of blankets and pillows.

"With what? You've got the hoodie," she said.

"Just take off your shirt and use that," Matt answered.

Ellie wasn't sure whether Matt was being intentional with getting her to undress or whether he has just said it without thinking through the implications. It didn't matter to her either way - she wasn't going to pass up the opportunity.

Before Matt realized it a topless Ellie, wearing only her tight blue jeans, was standing next to him at the treehouse window fanning the dusty air with her T-shirt.

"Oh..." Matt said, stopping abruptly. "I didn't... I wasn't thinking. Or I thought you were wearing..."

"You know I don't wear a bra. No boobs at all. If I need a bra then you do too," she said. She could see that despite her flat chest, Matt's eyes were fixated on her shirtless body. She also couldn't help but notice the long outline of Matt's cock trailing down his pant leg, as it had been since they'd left the house.

"Doesn't matter anyway. It's just us up here, right Matt? Who cares. Nothing you haven't seen before."

She kept fanning the dusty air with her shirt, and Matt started to do the same again with his hoodie. But now they were both distracted - it wasn't just the dust that hung stubbornly in the air, it was also the building sexual tension they were both feeling.

"This isn't working very well," Ellie said after a few more seconds of fanning.

"Maybe we need a new technique?" Matt said. By his tone Ellie could tell he was flirting with her now. Just like yesterday when they'd made their silly wager while playing video games, pretenses of both their intentions were slowly falling to the wayside.

"Got any big ideas, smarty pants?" she asked, tossing a sideways glance at her cousin.

"Hold off on the fanning," Matt said, letting the hoodie he was using for the task drop to his side.

Ellie stopped swinging the family reunion T-shirt back and forth, waiting for what Matt had in store next.

"The way I see it, the problem is here," Matt continued. He reached out to Ellie, who instinctively turned towards him. Matt's hands went to her upper arms, one hand on each, just above the elbow. "These little chicken-leg arms. No power!"

Ellie didn't resist as Matt's hands simultaneously traced up hers arms to her bare shoulders, then smoothly to her lower neck, then down without a hint of trepidation. She shivered as his hands glided over her flat chest and across her smooth black nipples.

"No muscle at all!" Matt said, continuing the ruse.

"Look who's talking! Your girly arms aren't any bigger than mine, doofus," she said with a smirk. She grabbed onto Matt's soft, undefined biceps.

"Maybe. But I'm a boy so it's like, more dense than a girl's arm. More strength per unit or something. That's science."

"Science_fiction_maybe," Ellie said. They were looking into each other's eyes now, and Matt's hands were still unapologetically on her chest. "So what's your big plan?"

"So you're lacking muscle in your arms and up here, but..." Matt said. His hands began to slide down Ellie's body past her stomach and to her hips. "But... you're not lacking muscle down here."

"My butt. You're talking about my butt."

"Yeah! You could..." Matt started.

"You want me to wiggle my butt at the dust?" She said, trying to hold back a laugh.

"No! Listen!" Matt said, beaming. He was trying his best not to laugh as well. The whole situation was silly, but they were both having fun being silly with each other.

"I'm listening!" Ellie laughed.

"Listen!" Matt said in a tone that emulated the fairy-companion of the hero in one of his Pretendo 64 games, a reference he knew she would get. "You've got the muscle down there, but you've also got a built-in fan!"

Now Ellie knew what Matt was trying to get her to do. His hand slid down from her waist over her jeans, over her thick butt and to her tail. Matt gripped the base of her tail lightly, the underside being a well-known erogenous zone for equines like themselves, then let his fingers slide lightly along its length. The fine black hair of Ellie's tail slipped between his fingers.

"Genius, Matt! Shake butt, use tail as a fan!" Ellie said playfully with a heavy load of sarcasm.

But she was eager to play along. She turned her body so that her backside was facing the open window and started swaying her hips back and forth, lifting her tail as much as she could. The long black hair hair of her quine tail swished back and forth, fanning air out the window.

"Don't just stand there, help me!" She said. Matt had just been ogling her.

Matt reached down to pick up his hoodie.

"Not like that! We need all the butt-power we can muster!" She said with a laugh. This whole ordeal was too funny to her to hold it back any more.

"But I'm..." Matt started in protest.

"We need our combined butt power!!"

Matt was giggling now too. He scooted up next to his cousin and began swaying his own hips as well, flicking his tail from side to side. In a moment he matched her speed and they were wiggling their butts and flicking their tails in unison.

By now there really wasn't much dust left in the air in the treehouse at all, but that wasn't the point any more.

"You're not lifting your tail high enough, your butt-power is sub-optimal! Your shirt is in the way!" Ellie laughed.

"Right!" Matt exclaimed. He grabbed the neck of his 'Shires do it Bigger' T-shirt and pulled it off, tossing it aside next to his hoodie.

Now they were both shirtless, wagging their butts and tails at the open treehouse window.

"Is it working?" Matt asked, testing to see what Ellie's response would be.

"I think so. Let me check," Ellie said, reaching over to Matt's butt while they swayed their hips and swished their tails. She slid her hand into the back pocket of his loose pants. "Not a lot of power in this little butt."

Not missing the cue, Matt reached over to grab Ellie's thick posterior. Instead of sliding his hand into her blue jean pocket, he went straight underneath the waistband.

"Yep, yours is the real powerhouse," he said, feeling her muscles tensing and relaxing with every motion. "But I think your true power is being held back?"

"My true power? How can I unleash it, oh wise Professor Z?" She asked, referencing an issue of one of the comics they used to read in the 'comics corner' when they were kids.

"Your jeans!"

"Of course Professor Z, my mutant genes!"

"No, Ellie! Not those genes, your blue jeans!" Matt laughed. "They're too tight! They're restricting your true power!"

For a few seconds Ellie just swayed her hips. She could feel Matt's hand underneath her tail.

"So I guess that means they're coming off," Ellie said, her voice a little lower and slower than it had been. It wasn't a question.

"Yep," was all Matt replied. But that was enough. She wanted to play this game as much as he did.

She wasn't swishing her tail as forcefully now, as her hand went to the front of her jeans to unbutton and unzip them. Her hips were swaying in time with Matt's, more like they were dancing without music than trying in earnest to fan the air.

"Would you unbutton my tail flap? Since you're already back there," she said.

Without a word Matt did as his cousin asked, unbuttoning the flap of denim that went over her tail. In a couple seconds he'd finished the job, and at the same time Ellie finished unzipping her jeans all the way.

What happened next was even beyond what Matt was expecting. Along with her jeans Ellie also gripped the hem of her panties, and before Matt could react they were both down to her ankles. His jaw went lax as she freed one leg and kicked both garments off her hoof into the corner of the treehouse.

"What? Nothing you haven't seen before," she said.

"Yeah, no, just... I wasn't expecting... your underwear," Matt stammered.

"They're_panties_. I'm a girl, girls don't wear underwear. Anyway, how could I unleash my true butt-power wearing panties?"

"You're right, what was I thinking," Matt said, regaining some composure. "So. Your true butt-power. Let's see it."

"Not so fast! Your butt may be tiny and pathetic, but we're going to need all the butt-power we can get. And right now yours is being 'restricted.'"

"Off?" Matt asked.

"Let's see it," Ellie answered, echoing Matt's words.

The fact that Matt's pants, unlike Ellie's tight jeans, were extremely loose didn't matter. The whole 'unleash your butt-power' game was just a silly excuse that both of them were using to get naked with each other, and neither needed any convincing. But there was a reason why Matt's pants were loose. There was a reason why all the pants her ever wore were loose. If he took them off something would be unleashed, all right, but it wouldn't be his butt-power.

"If that's what it takes. Can you get my tail flap?"

"Sure."

Matt turned so that his back side was facing towards his totally naked cousin. She unbuttoned the flap, then watched as Matt took off his pants. She didn't notice, at first, that it took him a little longer to do than it had taken her; his extra equipment that was currently obscured from her view required extra attention to detail. What she did notice was how similar his body looked to hers. Yes his butt was smaller, no he didn't have the same curves that she did, but aside from that it was identical. His gray-mottled fur, his black tail and black mane running down his neck and to the upper portion of his back - it was like she was looking over her shoulder at a mirror. No wonder everyone always said they looked like twins when they were kids.

Matt kicked his pants and underwear off his hoof, just as she did. She caught the slightest glimpse of the underside of his tail, his black equine tailhole that also looked identical to hers. But then her cousin turned to her, and all illusions that they were identical evaporated.

Matt's jaw may have slackened when he saw Ellie's naked body, but hers absolutely dropped when she saw his.

"Nothing you haven't seen before, right?" Matt said coyly, repeating what she had said moments before.

It_was_unlike anything she'd ever seen before, though. The fully grown stallions in the limited amount of porn she'd seen didn't have anything like that. When she had felt it the night before, stroked it up and down and had a full load of horse-cum blast her in the face, she'd never really gotten a good look_at it in the darkness. She could remember when they were little kids she'd seen it a few times, a little button in a black pouch with two marbles underneath. Not like _this. Not veiny and thick and down past his knees, with two massive balls as big as the oranges they had in their kitchen.

"It's just so... I mean it's..." Ellie stammered, eyes never leaving the thick black shaft with the half-dozen pink speckles.

"Shires do it bigger," Matt answered jokingly. "But there's no time to waste! Our powers are unleashed!"

Ellie snapped out of her lustful daze. She had almost forgotten why they'd gotten naked in the first place. Why was it again? The preposterous game they were playing, that was right. Butt-power and dust and swishing horse tails.

"Th-that's right! Our powers! My butt, and your..."

"My butt too!" Matt laughed, wagging his butt at his cousin.

"No, definitely not your skinny little butt, silly! But it will have to do. To the window!"

Ellie backed up to the window and started shaking her thick hips from side to side. Her lush black tail swept back and forth in a wide arc, fanning the air out of the treehouse.

"Come on, get next to me like we were doing earlier! Let our powers combine!" She giggled, quoting a line from cartoon show they had watched when they were little.

Matt sidled up next to Ellie and started swaying his much slighter hips in time with hers. Soon they were both swaying in unison, tails whipping back and forth.

But now something else was swaying along with their hips and tails. No longer contained with a pair of baggy pants, Matt's 14-inch horse cock was wildly flailing left and right in time with their hips.

What's more, that thing with his upper lip was starting to happen. At the same time the air in the treehouse was filling with dust, it was also filling with the odorless but pheromone-saturated scent of his cousin's fertility. Neither of them realized it, but Ellie was in the prime of her heat. Matt's equine cock was now nearly fully erect, not dangling down to his knees but pointing straight out.

"Your thingy is getting in the way!" Ellie squealed.

Matt thought it was really funny - and really cute - that, even though they were teenagers, Ellie still didn't use the 'grown-up' terms everyone else he knew their age did. She still used childish euphemisms. So it wasn't Matt's massive dick that was swinging like a pendulum, it was his 'thingy' or his 'weenie.' She didn't have a pussy, she had a 'cookie' or a 'muffin,' and under her tail she had a 'donut.' Matt didn't spray cum all over her last night, he 'spermed' her.

"Getting in the way?" Matt answered. "Oh no, now it's getting in your way too!"

He intentionally whipped it forcefully at Ellie, its length being so great that his cock slapped her upper thigh.

"Hey now..." she said, though Matt could tell she wasn't complaining. With his next hip sway he let his cock impact her again, this time on her stomach. At the speed they were both swaying their hips he was soon slapping her with his cock again and again, along her leg, hips and stomach, leaving little smears of pre-cum in her short mottled gray fur each time.

"Don't slap me with your thingy, you big dummy!" Ellie laughed.

"I can't help it! It's too powerful!"

"Gad zooks, Matt! Your thingy is draining all your power! We've got to contain it!"

"But how?"

Matt expected Ellie to answer with another silly quip. Instead, she grabbed hold of his cock when it was just about to slap against her thigh. Now they were swaying their hips and swishing their tails with Ellie firmly gripping his shaft, about halfway between the base and the tip. Neither spoke for a while - they both knew what they were doing.

"Good thinking. No more wasted power," Matt said before too long. "Just hold it steady to keep it from flopping around."

For almost a minute they continued like this, naked, part-fanning and part-dancing in front of the open treehouse window for anyone who happened by to see. But there was no one else in these woods on Christmas Eve.

Finally Ellie broke the silence.

"I think... I think maybe we could get more power if we were... if we were in line with each other. Instead of next to each other."

"You mean like, to focus our power?" Matt asked. He was more focused on Ellie's hand around his cock than finding faults in her plan.

"Exactly. We use my butt-power, and your... other power can amplify it," she said, knowing it made no sense. That wasn't the point. "So you need to be directly behind me."

"Good idea," Matt answered. It made as much sense as it needed to for him, which was precisely zero.

They didn't stop swaying their hips and flitting their tails as Matt shuffled over and behind the teenage filly.

"Back up. In front of the window!" Ellie said, continuing the ruse that wasn't entirely necessary at this point.

Matt backed up a couple feet so that he was shaking his butt out the open window, and Ellie backed up in step with him. Her thick ass pushed back into Matt, and they continued swinging their hips. Ellie's tail swished Matt's chin several times before it settled to his right side.

Throughout their change in position Ellie hadn't let go of her cousin's shaft. With Matt directly behind her, her arm was bent behind her awkwardly to hold onto it. She could feel the base portion of it, hot and hard, against her right butt-cheek. With nowhere else to go but sideways most of his length projected off to her right side.

"It's no good. We need to be in total alignment," Matt said, hoping Ellie would understand his meaning.

"Your weenie is messing everything up! It's ruining the harmonic frequencies!" Ellie said, flashing a grin over her shoulder. It was another reference to one of their favorite comics they'd read together years before in this very treehouse.

"How can we synchronize the harmonics?" Matt said, quoting the same comic. In the comic the super-heroes had been fighting a rogue scientist who was using a devious invention to disrupt the Earth's magnetic field, not synchronizing butt-power to fan dust out of a treehouse, but the situations seemed comparable enough to both him and Ellie.

"Leave it to me!" Ellie crowed.

Ellie gripped her cousin's cock tighter, tilting it slighly downwards. At the same time she lifted her right leg, balancing easily on one hoof. The unflared tip of Matt's equine penis smeared precum along the back of Ellie's thigh as she maneuvered it into the position of perfect alignment: right between her legs.

With a loud clop her right hoof dropped down again onto the wooden floor.

"Harmonics synchronized!" Ellie announced proudly. She looked down past her flat chest to see her cousin's massive 'weenie' jutting out in front of her, wedged firmly between her thighs and slightly parting the puffy lips of her 'cookie.'

"I said harmonics synchronized, Matt! Alignment achieved, butt-power maximized! Initiate protocol!"

She was repeating lines from the comic, but Matt barely heard her. It happened so fast and Ellie had his cock clenched so tight between her thighs that Matt couldn't immediately tell if he was inside her or not. It was only when she started swaying her hips back and forth again that he could feel that he wasn't.

Ellie was swishing her tail pack and forth again, the long black hair on her tail sweeping across Matt's chest in long arcs. Her tail was raised high - he had a clear view of her tailhole, or as she would call it her 'donut.'

"Faster! Faster!" Ellie commanded.

Matt wasn't even swishing his own tail. He was focused on keeping up with Ellie's rapid hip movements, staying in line with her not to 'harmonize frequencies' but to keep his cock firmly wedged between her legs.

Her motion was evolving now, though. With each sashay of her hips the movement less and less resembled the fanning they were doing earlier, more and more turning into a kind of erotic dance, the kind all the teachers had forbidden them from doing at the school dances.

What's more, Matt was having a harder and harder time keeping up with Ellie's sultry hips. And the more and more their movements desynchronized, the more and more his cock slid between her thighs.

"Is it working?" Ellie called back.

"It's working..." Matt answered with a weak voice. He could see the grin on Ellie's face as she looked at him over her shoulder.

"It's working for you?" she said. At the same time she was moving her hips forward and back now with each side-to-side motion.

"Yeah..." Matt said in a near-whisper.

"It's working for me too. It's working for me, Matty-doo..."

The facade they'd crafted of fanning out the dusty air, aligning their bodies and unleashing their powers was all but gone now. Matt didn't see much point in pretending any longer. He gripped onto Ellie's hips, holding tightly to halt her side-to-side motion. He started thrusting his hips forward and back now instead of back and forth, his long cock sliding in the tight triple-gap between Ellie's thighs and pussy.

"Your thingy is so big, Matty..." Ellie whispered, any semblance of the silly game they were playing now abandoned. She looked down over her stomach, seeing the veiny black rod jutting out from between her legs. From this perspective it almost looked to her like _she_had a 'weenie.' She couldn't understand how boys got along with those things dangling between their legs all day, and that was just the 4 or 5 inches she saw sticking out in front of her. Most of it was sliding between her thighs, she knew. What would it feel like for that to be inside me? How could it ever fit?

"Shires do it bigger..." Matt said. His hands moved up Ellie's body, from her waist to her stomach. One stopped there while the other continued upwards. Matt wrapped his arms totally around Ellie, pulling her back to him. Now his chest was against her back, his arm around her flat chest and fingers on her black nipples.

"Shires_do it..._" Ellie said, rolling her hips when she said the words 'do it.'

"Oh yeah? Shires do it?" Matt whispered, thrusting his hips hard enough to make an audible slap against Ellie's butt. Ellie's eyes were still fixed on the first cock she'd seen in real life jutting out in front of her from between her legs, teasing her pussy with each stroke.

"Oh yeah Matty, Shires do it. Shires do it, do it, do it, do it..." she said, repeating 'do it' like a mantra, and each time she said the words she pumped her hips and pushed back into Matt.

"Do it, do it, do it..." she repeated, wanting so badly for the cock stuck between her thighs to enter her and fill her. This was the plan she had since last month, she and her Matty-doo would lose their virginities together. Why not now, right here in the treehouse they spent so much time in when they were kids?

But her humping was having an unintended effect. With each push backward into her cousin, he was edging closer and closer to the open treehouse window.

"Do it, do it..."

With one last push back Matt reached the open window overlooking the forest 20 feet below. He started to lose his footing, his hoof skidding across the wooden planks.

"Ellie!" Matt shouted. She felt his grip around her tighten, and at the same time felt him pulling her backwards. Then, all at once, Matt's grip loosened and he started to fall away from her.

Ellie realized what was happening at once. She spun around, Matt's erect cock dislodging from between her legs. She caught the look of terror on Matt's face as he was beginning to fall out the window. But she wasn't going to let that happen. Like the superheroes in all the comic books in the corner of the room, Ellie was going to save him.

In a flash she grabbed hold of Matt's arm. His weight and momentum started to pull her out the window, but Ellie had a secret weapon - her butt-power. Ellie planted her hooves and, using the much-lauded strength of her butt and thighs, pulled Matt back into the treehouse with a mighty tug.

But, whether because of a panicked reaction or the incredible power of her butt, Ellie pulled Matt back into the treehouse so hard that she lost her balance. She staggered backwards, then tripped over one of the pairs of pants they had discarded earlier, falling on her back. Fortunately the pile of pillows and blankets that constituted the 'comics corner' stretched almost to the center of the room, so when she fell she landed softly and unharmed.

No sooner had her back hit the pillows then she saw her cousin tumbling after her. Pulling him back into the treehouse had a kind of slingshot effect, and he had tripped over the same pair of pants she had. There was no stopping his momentum. He was falling forward, right on top of her.

Matt did his best to avoid falling straight onto his cousin, spreading his legs so that his knees wouldn't hit her. Owing to his extra velocity he landed further up the pile than Ellie did, and at the same time his knees landed on the pillows to either side of Ellie's chest his citrus-sized balls plopped heavily on her chest, and his massive cock smacked into the pillow next to her face like a tree falling in the forest.

"Oh my god, are you ok?" Matt said, lifting his body up off of Ellie's face but remaining seated on her chest.

"Are you? You almost fell out the window!" She answered, looking up at him.

"We both did! You saved us!"

He tried to bend down to hug her, but he was sitting too far up on her chest. He shuffled back a few inches. Ellie felt the heat from his massive balls, she felt their _weight_as they dragged down her chest. Matt's cock was right next to her face, and it slipped across the fabric like a muscular snake.

Matt lifted his body back up after what would more accurately be described as an attempted hug than anything else.

"You saved my life," he said sincerely.

"I did not..."

"Yeah you did! I was gonna fall out of the window and you pulled me back in like a super-hero!"

"Super-zero," Ellie said, rolling her eyes.

"No, super-hero!" Matt laughed. "Ellie-Belly and her amazing super... butt power!"

"I can't be Ellie-Belly if my power is in my butt!"

"Ellie-Butt!" Matt yelled, beaming.

"No! That doesn't rhyme or end with a Y or anything!" Ellie giggled.

"Ellie-Butty?"

"Maybe Super Ellie-Booty."

"Hey, you said it, not me," Matt pointed out.

"I will, my trusty sidekick Matty-Doo," she chuckled.

"I'm the sidekick now?" he asked.

"Who saved who from falling out a window? You're the sidekick," she answered. The logic seemed sound enough to Matt.

"I guess that makes sense. But 'Matty-Doo' isn't a good name for a sidekick," Matt said.

"All right, now you'll be 'The Sidekick Formerly Known as Matty-Doo,'" Ellie said.

"No!" Matt said, trying hard not to bust out laughing.

"Fine then. You're 'Matty-Don't!"

"Nooo!!" Matt said, about to crack up. "It's gotta be something about my super-power, right? Like your super-booty. But I don't have anything 'super.'"

"You have a super-weenie," Ellie said automatically, without even thinking.

It was strange, but she realized at that instant just how comfortable and at-ease she was in this situation, and how impossible that would be with anyone else but Matt. Here she was, naked, an inexperienced virgin alone with a boy her own age. He was just as naked as she was, sitting on her chest, his balls resting on her bare skin and his fully-erect penis right next to her face. If he had been anyone else - a boy from her class, an acquaintance at camp, literally anyone else - her heart would be pounding out of her chest right now. She'd be freaking out. But with Matt she could be goofy and silly and fun. She could be herself. He was her best friend. What was there to be nervous about?

"I do?" Matt asked somewhat earnestly. Jennifer had told him how big his dick was, but he always had to take anything she said with a grain of salt. He still wasn't totally aware how much larger he was than normal.

"The adventures of Ellie-Booty and her trusty sidekick, Super-Weenie!" Ellie exclaimed rather than answering his question directly.

"That's not a good name for a sidekick!" Matt protested.

"You're my sidekick so it's my choice. You're Super-Weenie. And this," Ellie said, reaching next to her face and grabbing ahold of Matt's erect cock, "is Super-Weenie's super weenie."

Ellie looked up at her cousin and their eyes locked.

"I like your super weenie..." she said softly.

"I like your Ellie booty..." Matt said. His hands were behind him on Ellie's legs, and they crept down to her hips.

"Hey..." Ellie whispered. "Close your eyes. I wanna do something..."

Matt nodded weakly and did as he was asked. He felt his cousin lift his dick up off the blankets and press it against her face. At the same time he could feel her chest heave underneath his butt as she inhaled deeply.

Ellie didn't have to pretend any more. This was the first cock she'd ever seen up close, the first one she'd ever held in her hands, the first time she was free to feel it and explore it and have it in any way she wanted.

She pressed the end of Matt's cock harder against her cheek, like she was hugging it. With her other hand she felt along the length of Matt's shaft, starting near the middle and then down past the medial ring. Her hand paused for a moment at the base of the massive horse cock.

Matt expected her to start stroking it, but instead her hand continued to feel up the lower part of his stomach. Ellie's fingers brushed past his belly button, up to his chest, across his nipples, then back down to his stomach. Several more times she did this, hugging his cock against her face with one hand while groping his body with the other.

Matt didn't understand what Ellie found so interesting. The truth was that she was fascinated and more than a little aroused by the contrast and dichotomy, this almost unbelievably massive cock that blew away anything she'd ever seen in her porno stash being attached to such an unassuming, unmuscular and unremarkable torso - a torso which looked and felt almost identical to hers above the waist.

Her roaming hand once again reached the juncture where Matt connected to Matt's cock. It was weird that she was thinking of them as two separate things, she realized. Mentally there was her cousin Matt sitting on her chest, her best friend who she could be as goofy and silly as she wanted with, the friend she had known since they were born and who she felt more comfortable and relaxed with than anyone else in the world. Then there was that cock, that _weenie_on him, like some amalgam of the raunchiest videos in her 'secret' folder on the family computer and a sci-fi movie.

Matt cracked open an eyelid, hoping Ellie wouldn't notice. She had both her hands wrapped around the base of his cock now, her palms kneading it up and down while her fingers stayed on his body. He glanced at Ellie's face to make sure she didn't see him open his eye, but her gaze was solely focused on his cock, almost transfixed. He grinned; Matt had seen that mesmerized, cock-worshiping expression before on his sister Jennifer. She wasn't stroking it like Jennifer did, though. She was still just kind of toying with the base.

What Ellie was doing - though she didn't realize it either - was cementing the connection in her mind between her best friend and cousin Matt and that gigantic horse cock he had between his legs. It wasn't some nameless porno actor. It wasn't something that had to be hidden in a secret folder or that she had to be embarrassed about being attracted to. It was still Matt, all of it. It was just another part of the friend she trusted and loved more than anyone else in the world.

And that made it hot as fuck.

Now her hands went down below the base of Matt's cock. That little black coin-purse she remembered from when they were little kids had turned into this, like a black leather bag with two softballs inside it. Matt lifted himself up slightly so that his balls weren't resting on Ellie's chest, allowing her to fondle them with both hands, feel their weight and heft. Such was their size that they did, indeed, fill both of her hands.

Matt was in no rush. He could see Ellie was mesmerized by his cock, the same way Jennifer was. It reminded him of the way his sister idly played with it for hours last night under the blanket while they were all watching that movie in the family room. If Ellie wanted to spend all morning exploring his cock, he was happy to let her.

Ellie wasn't content with just fondling, though. She couldn't hold herself back any longer. She wanted this, all of this. She wanted to taste it and to feel it inside of her.

Her hands went now from Matt's mammoth balls to his pipe-like shaft. At the same time she rolled her head to the side where her cousin's cock was against her cheek. With the clumsiness and eagerness of the teenage virgin she was, she opened her mouth.

Matt didn't see any need to pretend to still have his eyes closed. Ellie was trying to suck his cock, but he was sitting too far forward on her chest for her to be able to - his dick was too long, the tip of it was up near her pointed equine ears. So he scooted back, dragging his butt and balls down her body until he was sitting more on her stomach and waist than her chest.

Ellie didn't waste a second. With the flat head of her cousin's cock even with her mouth, she immediately wrapped her lips around it and started bobbing her head.

Matt bit his lip. Jennifer had sucked his cock plenty of times, but this was different. Jennifer's desire for him was purely physical, a nymphomaniacal focus on his cock - and by extension, him - as a physical object to be used for sexual gratification. He was fine with that from Jennifer, since that was more or less how he viewed her when they were having sex. But Ellie was different. She was looking straight up at him, their eyes were locked. It was like she was seeking recognition and approval from him, not just the fulfillment of a biological need. Ellie's technique was non-existent, the way she was stroking his cock up and down while sucking on it could be described as inept. She could only get a few inches of the end of his cock in her mouth. But that look she was giving him, that vulnerability and that innocence - that was working for him far better than Jennifer's skillful blow jobs ever did.

At the same time she was bringing Matt closer to orgasm Ellie was nearing her own climax. Matt didn't realize it, but he was swishing his tail back and forth, and at the angle he was sitting the hairless portion near his tailhole was sweeping back and forth across Ellie's plump equine pussy. He was accidentally masturbating her while she was sucking him, and her pussy was winking uncontrollably.

"Ellie..." was all Matt could utter as he felt his orgasm coming on. He didn't want to cum yet - he knew from experience what blow jobs could lead to, that with Jennifer they were usually just a warm up for hard fucking. That's what he wanted; Ellie was a hot mare in heat and he wanted to breed her, fuck her down into the blankets and pillows of the 'comics corner' and fill her with his life-creating cum. But those eyes looking back into his... she was just so cute, and she was trying so desperately to please him. It was hot on a level totally distinct from anything he'd experienced with Jennifer.

"Ellie, I'm gonna..." Matt managed to exhale. He never told Jennifer when he was about to cum when they fucked, he just did it. This was more a last ditch effort to get her to stop before it was too late so that he could spread her legs and fuck her properly.

But Ellie didn't know that. At the moment Matt spoke Ellie reached her climax, spurred on by her cousin's tail flicking her wink-exposed clitoris. Her abdominal muscles clenched, her butt writhed, and a wave of crashing pleasure swept over her body.

"Ellieee..." Matt moaned as he reached his own point of release.

In an instant she felt the end of her cousin's horse-cock swell and engorge, flaring inside her mouth, forcing wide her jaw. A torrent of cum - 'sperm' as she called it - gushed out like a garden hose, filling her mouth. Juices from her own gushing pussy coated the base of Matt's tail as she swallowed almost the entirety of Matt's first thick jet.

"Nnnhh..." Matt grunted as he emptied another pulse of cum into his cousin's mouth.

Ellie wanted to swallow Matt's entire load, but the shear volume of cum pouring into her mouth made it an impossibility. Instead she opened her mouth wide and stuck out her tongue. Matt's shaft spasmed in her hands with each stream. Like frothy waves crashing over a beach he ejaculated all over her, covering her tongue and nose, cheeks and jaw. An errant stream of cum landed between her eyes, oozing over her the black hair of her mane between her ears. Even those weren't safe when another pulse landed squarely on her left ear, which she involuntarily flicked.

"Hahh... hahh..." Matt grunted when his ejaculations tapered off and, finally, ceased. His cousin's face was covered, absolutely covered, with horse cum, from her lips to her nose, ears and jaw down to her neck, even some on her chest. It was like a massive water balloon filled with Uncle Bob's clam chowder had exploded above her, a one-man bukkake. Still, as his cock went flaccid and receded, retreating back into his leathery black pouch-like sheath, he saw that she was smiling. And her eyes were still on him.

"Sorry... kind of a mess..." Matt said without thinking.

"I like it," Ellie answered.

"Really?"

"Yeah. It's from you, so I like it. Your sperm tastes," she said, licking her lips, "really good. And it's only for someone you love, so it's really special."

Matt really didn't know what to say in response to that. When he had sex with Jennifer, she was usually calling him a pervert and leaving to clean herself up at this point.

"Do you love me Matty-doo?"

This was _definitely_not something he'd ever hear from Jennifer. Still, it wasn't a big deal. He did love Ellie - not strictly in a romantic way, but definitely in a familial way, and now in a best-friends with benefits kind of way. What wasn't to love about that?

"I do," Matt said. He realized that kind of sounded like a marriage vow, so he added, "I do love you."

"I love you too, Matty-doo," Ellie said. "I want to tell you something. Promise not to tell anyone?"

Matt nodded, unsure where Ellie was going.

"I want my first time to be with you."

Matt's eyes widened before Ellie continued.

"I... don't want to just give it away to anyone, you know? I want it to be special. I want it to be with someone I love and trust, and who loves and trust me too."

Ellie didn't see any reason not to lay all her cards on the table.

"I kind of had this plan... I figured since we're both virgins, it would be special for both of us. We could both lose our virginities at the same time. With each other. Would that be... would you want to?"

Now the first thing Matt thought of was, of course, the fact that he was not a virgin - he'd had sex several times a day, nearly every day, for the past two months. But Ellie didn't know that. And she didn't need to.

"Yeah. Yeah, definitely. Yes. For sure, yes," Matt said, nodding his head. "If you had told me a few minutes ago we could have..."

"Yeah... that's okay. We still had fun. And we still have time," Ellie said.

"So... not right now. Later?" Matt said, testing the waters. He might be able to go again, but not immediately. It was getting close to noon, as well, and their family was expecting them back for lunch any minute.

"How about tonight, after everyone goes to sleep," Ellie said. That had always been her original plan.

"That works," Matt answered.

"Awesome," Ellie said, smile beaming across her cum-blasted face.

"Now let's get you cleaned up," Matt said, reaching over for one of the two matching 'Shires do it bigger' T-shirts for Ellie to wipe her face off with. Matt grinned. That night he'd show her exactly how shires do it bigger. He'd give her first-hand experience on how shires really do it, do it, do it.

---

They were about halfway to the store now, just the two of them riding in the station wagon, and they'd barely spoken a word to each other. He didn't seem to suspect anything yet.

Then again, Lindsey never thought of her nephew as being especially intelligent. Or hard-working, for that matter. She didn't think he was stupid or lazy, he was just kind of... how could she describe it? Unfocused. She thought of her nephew Matt as a follower, not a leader. Someone who just kind of drifted aimlessly. And she didn't think it would serve him well in life.

Not like her daughter. Ellie had a bright future. Ellie was going places. Her life might have been on the same track as Matt's, but then Bob came into their lives and whisked them out of this backwater. Ellie would go to the best university while Matt would be lucky to get into the local community college. After med school Ellie would go on to a lucrative career as a surgeon, or maybe a hospital executive. Lindsey had everything planned out. What would Matt be doing when Ellie was a world renowned doctor? Probably still in this two-bit hick town, scrounging together what he could.

That's what she'd still be doing if she'd never met Bob. She'd still be just trying to make ends meet as a single mother in the middle of nowhere, and Ellie's prospects would be nil. Ellie wasn't Bob's biological daughter, but he always treated her as if she was, and he was a better dad than Lindsey could have ever hoped for. She owed him so much that she could never repay. But there was one thing she could give him: a foal of their own.

This, unfortunately and regrettably Lindsey thought, was where her nephew Matt became woven into her plans. She was sure he'd be mopping floors at some fast food restaurant years from now when Ellie was performing open-heart surgery, but he had a purpose to serve today in her master plan.

As much as she loved Bob, and as much as they tried, they'd never been able to conceive together. Last month, when she'd been visiting for Thanksgiving, she witnessed the unthinkable: her nephew and niece having sex, raw and unprotected. If she could get this little slacker in the passenger seat to do to her what he saw him do to his sister, then if she could have sex with Bob while they were here to make the timeline believable, Bob would think the foal was his. They'd finally have their perfect family. It wasn't cheating if she didn't even want to do it, she kept telling herself. It was just a means to an end. No one had to know. And with the dirt she had on her nephew, she could make sure he would never tell.

"I think it would be faster if you turned left at the next light, Aunt Lindsey," Matt said, breaking several minutes of silence. The events of the previous night kept running through his head, when his aunt had undressed right in front of him and ended up sucking his dick. What the hell was up with that? And why had she been so insistent that he join her on this shopping trip?

"I know how to get there, thank you," his aunt answered. She was impossible to read.

She continued driving in silence, and after a few more minutes they were pulling into the parking lot of Big-Mart. Just as Bob had warned, it was indeed a 'mad-house,' swamped with shoppers on Christmas Eve.

The only open parking spaces were far away from the entrance. Matt kept quiet for a while as his aunt drove past them, continuing on towards the front of the store where he knew they would never find a spot.

"I don't think we're going to find a spot this close," Matt suggested.

"We can park in the back," his aunt answered, like it was a normal thing to do.

"In... the back of the store? You can't park back there," he said.

"We can."

She noted the confused look on his face as she drove around the side of the mega-retailer, past the garden section and around back. She went past the loading docks behind the store, down to the far end where several dumpsters were lined up side-by-side next to the store's back wall. She stopped next to them, looked around to make sure no one else was around and backed the station wagon in snugly between two long dumpsters, totally hidden from anyone who might happen to be in the back of the store unless they were right in front of the car.

"Aunt Lindsey... I don't think we can park here..." Matt said.

She breathed in deeply, turning the key to shut off the station wagon. The time had come. The stage of her plan for the big reveal was now at hand, and once she started there was no turning back.

"We need to have a little conversation about what you did yesterday."

Matt gulped. Lindsey saw her nephew was looking straight at her now.

"I know what kind of a colt you are. A little pervert. What happened last night... spying on me while I undressed? Getting a stiffy from it? Forcing me to suck your... thingy..." Lindsey said. She habitually avoided using actual profanity and used euphemisms whenever possible. Cursing was unladylike, she'd always told her daughter, and so Ellie also avoided using profanity. That's where her habit of using childish euphemisms came from.

"It wasn't like that! I didn't force..." Matt started.

"Oh, so it's my fault you're a little pervert, lusting after his own aunt? I'm to blame for your disgusting behavior? All my fault? What if I told your mother what you did? Whose side do you think she would take?"

"That's not what happened and you know it! I wasn't peeking, you took off your clothes right there, in my room, and then you started dancing like a... a stripper! I didn't make you do that!"

Lindsey had anticipated Matt might be a little difficult, but she honestly was not expecting this level of resistance. In her best-case scenario she could threaten to tell Matt's mom about what had already happened and that would make him pliable enough to do whatever she asked. Maybe she could even frame what she was about to do as a 'teaching moment,' as ridiculous as that would have been.

But that was out the window now. There was only one choice left if she was going to get what she wanted from Matt, the perfect family with Bob and Ellie, only one way to make sure he never spoke a word of it to anyone.

Blackmail. Pure blackmail.

"Okay. Stop. Listen Matt. Listen good to what I am about to tell you and don't interrupt."

Matt immediately took note of the drastic change in his aunt's voice. She was speaking lower, softer - she wasn't arguing with him any more. And that scared him.

"I know what you've been doing with your sister."

Matt's jaw drooped open, and he felt his heart and stomach dropping down to his hooves.

"Aunt Lindsey, I... what do... I..." Matt stammered. She hadn't actually said it yet. Maybe she meant something else?

"When we were visiting over Thanksgiving, I got up from bed to use the restroom. I heard some noises coming from Jennifer's room."

No, she definitely didn't mean something else.

"The door to Jennifer's room was cracked, so I looked in. Matt, what I saw you and your sister doing... you know what I saw."

Matt was frozen in place. She knew. His aunt knew. This was the end, the end of everything.

"Now. I didn't tell your mother. I thought about telling her, and I really should have, but I didn't. Do you understand?"

She could tell by the aghast look on her nephew's face that he didn't understand. She really was going have to spell it out to him. He wasn't the brightest...

"I didn't tell your mother what you and Jennifer have been doing, but I could have. And I still can, you understand? I still can. Do you want me to tell her, Matt?"

Matt shook his head 'no.'

"No, of course not. And you know what? I don't _have_to tell her. She doesn't _have_to know. She never has to find out. Would you like that, Matt? Would you like for me to keep your secret from your mother?"

Matt nodded his head 'yes.'

"Good. I can keep your secret, Matt. I promise I will. But..." she said, and this was the key pivot point of her entire scheme, "you have to do something for me. Can you do something for me, Matt?"

Again, Matt just nodded his head.

"Is that a yes?" Lindsey asked her nephew.

"Y-yes..." Matt finally managed to say.

"Good. Good. Now here's what's about to happen," Lindsey said. "I'm going to get out of the station wagon and I'm going to drop the tailgate. While I am doing that, I need you to take off your pants and your underwear."

"I... what?" Matt stammered.

"Once you have your pants off, get out of the car and come around back to where I am. I will be bent over the tailgate with my pants around my ankles."

"Wh-what??" was all Matt could say.

"Don't say a word to me, don't look at my face. Just get behind me. Get behind me and... and do what you did to Jennifer. Do that to me."

"You want me to... you want me to fuck you?!" Matt blurted out.

"Shhh, language! Don't say that word!"

"You want me to... you want to have sex?"

"What I saw you doing to your sister, I need you to do that to me." Lindsey said, dancing around the terminology mostly for her own sake. That was why she told Matt not to talk to her or look her in the face. If she just bent over, spread her legs, closed her eyes and let her nephew pump her a few times, she didn't have to think of it as cheating on her husband. If she didn't call it sex... if she didn't enjoy it, if she never even saw it, then it was like it never happened.

"Aunt Lindsey I... I don't understand. I don't want to..."

"Listen here, young man! Do you want me to tell your mother what I saw?" she snapped. "Then do as I say and don't ask questions!"

With that she opened the driver's side door and got out of the car. She'd managed to wedge the station wagon in between two dumpster that were pretty close together, so she wasn't able to open the door all the way. She managed to wiggle out with the door against the metal wall of the dumpster.

Matt's mind was racing as he watched his aunt through the rear-view mirror. She lowered the station wagon's tailgate. He couldn't see it, but he heard her unzip her blue jeans.

"Are you taking your pants off?" she barked at him.

"I..."

"Do you want me to tell your mother what you did? Do as I say! Take your pants off and get back here!"

There didn't seem to be anything he could do. The choice was either have his biggest secret exposed and his life ruined or fuck his aunt. Not much of a choice. So that was it. He'd have to do it. He'd have to fuck his aunt.

Matt unzipped his pants, lifted his butt off the seat and pulled them off for the second time that day. Just a few hours ago he'd done it for Ellie, and now he was doing it for her mom.

But there was a problem. In the confused, scared and startled state he was in, Matt's cock had retreated back into his sheath. This wasn't sexy, this was scary. How could he fuck his aunt if he couldn't get hard?

"Hurry up!" she demanded.

Naked from the waist down, Matt cracked open his door and shimmied out of the station wagon. He was only wearing his hoodie with nothing underneath - when Ellie cleaned his cum off of her a few hours ago she'd used the 'Shires do it bigger' shirt he had been wearing under it, and she had worn the clean one back to the house. They'd eaten lunch and he never had time to change into anything else before his aunt made him come with her on her 'shopping' trip.

The scent of putrefying garbage inside the two dumpsters on either side of the station wagon permeated the air. Matt reached the back of the station wagon and saw his aunt. Her pants weren't around her ankles - they were totally off and sitting neatly on one side of the tailgate. She was bent over, her butt in the air, legs spread wide with hooves firmly planted on the asphalt. Her black tail was lifted high.

"Well? Get behind me and do it," she said, her voice muffled. She had buried her face in her crossed arms. She didn't want to look at Matt at all, so she didn't see that he was still totally soft.

"Aunt Lindsey, I'm not..." Matt protested feebly.

"Shut up and do it!!" She yelled.

"It's not hard!"

Against her better judgment she peeked back to her nephew.

"Oh for Pete's sake..." she said. What was his problem? That kid had a boner 24/7, she could see it outlined in his pants constantly. What the hell was wrong with him?

Don't panic, she told herself. Think. Think!

A-ha, of course!

She rolled over on her back, lifting her legs while laying on the station wagon's tailgate. She put her hands back over her eyes so she didn't have to look at her nephew.

"All right Matt, listen. Come over here... come over here and stick your face between my legs," she said.

She'd remembered that she was in heat. It was simple horse physiology - a couple deep huffs near her 'muffin' and this little colt's nostrils would be full of fertile mare pheromones. He was a guy, after all - it was all but biologically impossible for him not to get hard when that reptile part of his brain was flooded with those chemical signals that screamed 'equine in estrus.'

"You want me to what??"

"You heard what I said! Do you want your mother to find out what a pervert you are?! Just do it!!"

Matt slid between the painted cinder-block wall and the back of the station wagon. His aunt had parked so that there was barely any room between the end of the lowered tailgate and the wall, a couple feet at most. He shuffled sideways, hooves clopping on asphalt with a distinctive sound, until he was right in front of his aunt.

Before him he saw what would have been unimaginable to him this time yesterday. His 32-year-old Aunt Lindsey - his mom's sister and Ellie's mother, he reminded himself - was naked from the waist down, laying on her back on the tailgate of that old station wagon he'd ridden in a million times. She had her hands over her eyes, her shirt pulled up a little around her neck, and her legs spread wide open.

Matt looked down at her. The thick tip of his cock began peeking our of his sheath as his eyes traced the contours of his aunt's body. In a way she looked similar to Ellie, and in a way she looked similar to Jennifer, unsurprising since they were all so closely related. Her body coloration was the same as theirs, the same as Matt's, dappled gray with lighter splotches on the haunches.

But there was a striking difference. Matt knew how serious his aunt was about fitness, but even knowing about the endless hours she spent at the gym he somehow never expected her to be this... well, fit. She wasn't muscular or bulky, not like a female bodybuilder or even a stallion might be. It was just that everything was so lean, cut, like she had almost no body fat at all. Her shirt was raised a little above her belly button and he could see her well-defined abs, and a little lower he saw the toned V-shaped ridges of her lower torso and pelvis. She looked like one of those fitness models wearing bras and panties in the department store catalogs Matt used to use to jack off before they got dial-up internet at their house. He used to see those V-shaped lines on those catalog models' midriffs and wonder what it they led to. He had to use his imagination back then, but now his aunt with the fitness model's body was baring it all for him and he could see clearly what was always covered up in those old catalogs.

Aunt Lindsey's pussy looks familiar, that was the first thing Matt thought when he stopped ogling her body and focused directly on it. It was the feature his aunt shared with Jennifer and Ellie, that familiar stretch of bald, black skin stretching from the base of the tail and tailhole to the genitals. Take away his aunt's body and he could believe he was looking at Jennifer's pussy, which he knew so well. So warm and inviting, so tight, practically begging to be filled. Matt's cock was half-erect now, emerging from his sheath at the sight.

"Are you listening? Put your muzzle between my legs!"

Matt glanced up at his aunt's face. Her hands were still over her eyes, but she had taken a peek between her fingers to see what the heck was taking her dumb little nephew so long. For a split-second their eyes met, and the instant it happened Lindsey's fingers closed together again to shield her eyes.

"I mean now!" she demanded.

Lindsey heard his hooves clop on the asphalt as he got down on his knees, the only way he'd be able to get face to face with her sex. This wasn't going exactly how she planned, but if she could get him hard it could still work. She felt his warm breath on her 'muffin.' Good, she thought. Just inhale.

Her eyes shot open and she nearly screamed as she felt her nephews broad, wet tongue press against her vulva.

"Don't lick it you idiot!"

Matt almost bit his tongue as his aunt's hands shot out to his muzzle. She grabbed onto the end of his long equine snout with both hands, holding his mouth closed with a vice grip while directing his flaring equine nostrils to her sex.

"Just breathe in!" she commanded.

The scent of his aunt's heat was having an effect on Matt. He was mostly erect by now, his nose just an inch away from the source of those mind-altering pheromones. He breathed in deeply, prompted by an urge he did not fully understand and was powerless to control, his nostrils filling with the chemical signals of a mare ready to be bear foals.

"Good... good... just like that... wait stop! Don't touch!!"

One of Matt's hands had darted up from underneath the tailgate, skimming across her bare, muscular thigh and up to her body. Matt felt the ridges of his aunt's abs before she snatched him by the wrist.

"Don't touch! You're not allowed to touch me like that!!" she yelled. Aunt Lindsey's rules seemed completely arbitrary to Matt, whose actions were guided both by instinct and by his experiences with his sister.

"Okay, good, breathe in... like that... I said don't touch you little pervert! Don't touch me!!"

She'd thrown his groping hand aside, but it went back to her stomach immediately. This time she clenched onto it even tighter, and Matt felt the sting as her wedding ring dug into his wrist. Defeated, his arm slid back down below the tailgate, this time to his own cock, which by now was fully erect, rock-hard and dribbling precum onto the asphalt.

Lindsey watched him inhale deeply again and saw his lip curl involuntarily, exactly the response she was hoping for.

"Are you hard yet?"

"Mmph... Mm-hmmph," was all Matt could grunt out. His aunt was still holding his mouth shut with the hand that wasn't fending off his roaming hands.

"Is that a yes?"

Matt nodded.

"Okay... okay... good, okay..." she said, mostly to herself. A bump in the road, a necessary action to give her loving husband the foal they always wanted together. That's all this was. It's not cheating. Don't think about it. It'll be over soon. Just a few pumps and it will be all over.

She pushed Matt's face away from her pussy forcefully and rolled over on her stomach - she felt her nephew's cock brush against her leg. Her hooves hit the asphalt with a loud double-_clop-clop._She lifted her butt and tail and spread her legs, offering herself to the young stud to be mounted and bred from behind like a farm animal so she wouldn't have to look at him while he did it.

Now she felt her little nephew's hands on her butt. She almost slapped them away and thought about yelling for him not to touch her, her first instinct being that of indignation and disgust at her sister's teenage son grabbing two handfuls of her ass. It reminded her of those cigarette-reeking creeps at the strip club she briefly worked at. But this was necessary. She wouldn't let him touch her boobs or even her stomach, she thought she would puke if he tried to kiss her, but she could compartmentalize what he was doing back there. All of it is for a purpose, she told herself. A necessary evil, an ordeal she...

There it was. So big that if both Matt's hands weren't on her ass, Lindsey would have assumed it was his arm pressed against her inner thigh. But it was unmistakable. That massive black rod she'd seen a month ago plunging in and out of her niece - now it was between her legs.

She bent her knees to allow Matt better access to her 'muffin.' Compared to Jennifer or her sister she was small, but she was still a Shire, and at 6'2" she was still more than half a foot taller than the colt standing behind her.

Lindsey felt the heat of the cock as it crept up her thigh. Lowering herself an inch or two more and it was there, right between her legs - right on her pussy. She braced herself, holding her breath, ready for him to jam it deep inside her any second. Any second. Any second...

He wasn't putting it in. He was right there, but her dumb little nephew wasn't putting it in. What the hell was his problem?

"Are you stupid? Put it in! Hurry up and do it! Do it!"

Matt was reminded of what Ellie had said a few hours before in the treehouse. Shires do it bigger, shires do it, do it, do it. And here he was, unexpectedly and bewilderingly about to 'do it' with Ellie's mom, the mare whose daughter he'd promised to take the virginity of that very day.

But there was a problem. It wasn't the incest. Matt didn't think anything of that now. It wasn't that he was thinking about what screwing her mom would mean for Ellie - he'd already lied to her about being a virgin himself and he was planning on going back to fucking Jennifer as soon as they left, so what did it matter if he fucked Aunt Lindsey too? No, those weren't the problems.

"Is it safe?" Matt said.

"What?" she answered. Lindsey could almost feel his heartbeat from the throbbing horse cock nestled against her pussy. He was right there. What was he talking about?

"Is today a safe day?"

Now she understood. He must have picked up from somewhere, maybe Jennifer, that having unprotected sex wasn't risky if it was a 'safe day.' Of course that wasn't true - there were less risky days, but there was always a risk if you weren't using contraception. Maybe Jennifer had tricked him the night Lindsey saw them having sex, telling him it was a 'safe day,' and that's why he came inside her. Maybe they were both really that clueless. Whatever, she thought. Doesn't matter. If that's what he believes, it could serve her well.

"Absolutely. Today is absolutely a safe day. The safest. As safe as it gets," she lied, knowing that it was the riskiest time of the month possible for her. That was the point. "And tomorrow is safe, and the day after that, too, okay Matt? It's safe the whole time I'm in town. Totally safe. So you have to finish inside me, okay? It's absolutely impossible for me to get pregnant while I am visiting so you have to let it all out inside me. Every drop. Or else I'll tell your mom about you and your sister."

She waited for a reply from her nephew, but he didn't say a word. Maybe she had poured it on a little too thick. Was she too patronizing? Would he realize she was lying? Would he...

"Guh, uh...!" Lindsey grunted, unable to form words. Her eyes widened, her muscles tensed. Matt had rammed the flat-headed tip of his cock inside her.

Matt's lip did that thing again that it always seemed to do when he was horny. It hit him all of a sudden and he couldn't explain why; in the car he had been totally flaccid, his dick fully retracted into his leathery horse's sheath. But within just a minute or two of seeing his bottomless aunt and getting a face-full of her pussy, he was hard as a rock. He'd barely been able to contain himself long enough to ask her if it was a safe day. With that assurance given, his brain stopped calling the shots and his cock took over.

Aunt Lindsey was so much tighter than his sister. _So_much tighter. She was almost two feet shorter than Jennifer, and a tight pussy made sense given how lean, fit and tight her body was. But given that a nearly 8-foot mare with a stupidly big pussy was his only frame of reference, Matt was still in awe of how his aunt's sex seemed to clamp down on his cock and almost pull him in.

He pushed as it pulled, slowly, inch by inch.

"Guhhh, unnhh..." Lindsey groaned. Her nephew was only a little more than halfway in and it was already far more intense than she was expecting. She may have worked as a stripper when she was younger, but she had never been very sexually adventurous, and in her life had only slept with a handful of stallions. Bob's 'weenie' was thoroughly average, not small or large by horse standards, about 8 inches long and a few inches thick. That was her frame of reference.

The major shock was the _thickness_of her nephew's cock. It was like he was shoving his arm inside her, stretching her out from the inside. She'd never felt anything like it, and her body was responding in a way she hadn't expected.

Matt felt his aunt Lindsey's pussy start to wink uncontrollably. She was dripping wet - she had been since she shoved his face between her legs. She was dripping onto the asphalt below, between the dumpsters behind the big-box store, a puddle beneath her growing with every wink that tightened around the gigantic cock her body was begging to be filled with.

He looked down at his slick, mare-juice covered cock, now buried in his 32-year-old aunt nearly to the hilt. Ass up, tail-lifted, black donut-like tailhole staring back at him, a mare offering herself freely with his cock fully enveloped - Matt had always thought this was the most beautiful sight in the world. Before this moment he'd only ever seen it in person with his sister, but she wasn't so special. This was just as good. This might even be better.

Slowly - just as slowly as he had pushed into her - he started pulling out. He got out about halfway, his now glossy, slick shaft emerging to his medial ring, the pink interior of his aunt's the folds gripping it tightly as if begging it not to leave. And so he obliged, pushing back into her. Out, then in, then out, then in, faster now, faster. Shires do it bigger. Shires do it, do it, do it. Shires fuck. And he was fucking his aunt Lindsey.

She felt like her body was rebelling against her mind. This was supposed to be strictly business, close your eyes and count to a hundred type of deal. But she'd never been stretched and filled like this. Not ever. That reptile, animal part of the brain she'd exploited in her nephew, the part that just wants to eat, sleep and fuck - she had that too. And right now it was screaming at her. Whatever stud this is you've managed to snag, it said, whatever dick this is pumping in and out of you, it's in a different league than the one you've been taking for the past several years, that one that can barely get hard and has been trying and failing to put a foal in you for almost a decade. This is what we deserve, it said to her. This is what we_need.That other one may be your mate, but this one is your _stud, the one you_deserve_. This one will be the one to put a foal in you.

"Guhh... uhhnnh... guhhh..."

Vaguely she was aware that Matt's hands were sliding up from her butt to her back. Her 'no touching' rule was forgotten as her nephew, still thrusting, his cock sliding in and out of her rhythmically and smoothly, dipped his arms down from her lower back to the sides of her stomach. She instinctively lifted herself up from laying on the floor in the back of the station wagon. This is a stud that doesn't come around often, her body told her. You won't get this opportunity again. Give your body to him.

He wrapped his hands around her stomach, pistoning faster and harder. He covetously ran his fingers over her chiseled abs, up and down and up at least a dozen times. Once he got his fill with that part of her anatomy his hands ran up her body underneath her shirt, past her ribs and to her chest. Unlike her daughter, Lindsey always wore a bra - A-cups, heavily padded to make her feel like more of a mare, since her breasts weren't much larger than the total flatness of her daughter. But the colt breeding her from behind didn't seem to mind. She let him run his hands underneath her bra, offering no protest as he massaged and groped and fondled them, pinching her black nipples and then grabbing their fullness with both hands.

Matt continued rubbing his aunt's tits for another minute, maybe two, never slowing down in his almost mechanical thrusting. Whether it was his sister's massive boobs, Ellie's flat chest, or these perky little tits on his aunt, he wasn't picky. He liked them all. His aunt's body, he thought, his hands retreating now from her chest, back down her body and over those crazy defined abs, back up to her thick butt and hips - her whole body is something else. Wild.

His gaze now returned to his cock, sliding in and out of her, her teardrop-shaped horse pussy winking around his shaft, that cute little puckered black tailhole bouncing up and down in sync with his motion... the most beautiful sight in the world.

"Oh... ohhh... oh... ohhhhh..." she was moaning beneath him, totally in his control.

Lindsey was still looking down at the floor, at nothing in particular, lost in pleasure with her focus on her other more carnal senses. But then a glint of light caught her eye. Her gaze darted to her left hand, to the ring on her finger.

She covered it with her right hand, out of sight and out of mind. She was doing this Bob, but she'd already crossed the line. There was no reason not to enjoy it now, right?

Now she looked up, out the front windshield of the station wagon. She saw her face reflected in the rear-view mirror and barely recognized herself. Her jaw was slack, her tongue was half-lolled out of her mouth. That wasn't her in the mirror, that was a cock-hungry slut, the kind of whores she worked with at that strip club who made extra money on the side. And behind her...

It wasn't the tall, handsome, sexy stud that her body, relying only on the size of his dick, was telling her she was being taken and ravaged by. It was her dumpy teen nephew, that little aimless pervert with no apparent goals or aspirations. It hadn't taken a sophisticated and successful stallion with riches and class sweeping her off her hooves, taking her to exotic locations abroad to get her to cheat on her husband - she was giving herself to a horny teenager between a couple dumpsters in the back of an old station wagon behind the Big-Mart for free. All those hours at the gym every day, all that smug attitude, yet here she was.

Matt's head was still down, his eyes focused on nothing but his dick pounding his aunt's pussy, darting up every few thrusts to her tailhole. He was close to cumming now, really close. The fact that he'd soaked Lindsey's daughter with cum just a few hours ago didn't matter. He knew from all the experience with his sister that he could go several times in a day, and if even just a few hours had passed he would cum just as much as if he hadn't ejaculated for a week.

He didn't know it, but that was what all this was for. His aunt needed as much of it as he could produce inside her, on a day that was anything but 'safe.'

Lindsey could feel her nephew gripping her butt tighter, almost kneading it with his hands. She couldn't see his face, bent down as it was gawking at her nethers, but she could see his nostrils flaring. She hadn't slept with a lot of stallions, but she'd had sex enough to know what it looked like and felt like when one was about to cum.

"Inside! Finish inside!!" she screamed.

Characteristically, Matt gave no overt indication that he was about to cum.

"Are you close? You have to..." Lindsey started, but the rest of the words never came.

Deep inside her, deeper than any stallion had ever been, the bulbous tip of her nephew's cock bloomed, ballooning out and stretching her from the inside in seconds. It was accompanied by an intense, body-filling wave of heat from the same source.

This wasn't a new experience for Lindsey. She was a mother, after all, and she and Bob had been trying to have a foal for years. But his cock was puny compared to Matt's, and his flare was wasn't in the same ballpark. It wasn't on the same_planet_. Whereas the flares of the handful of stallions who had cum inside her in the past felt warm and fulfilling, her little nephew's was an all-encompassing mind and body altering singularity, a claiming of property, of a mate. This..._this_what it felt like to be mated.

Her eyes rolled back as a wave of pleasure engulfed her, her body's reward to her for fulfilling her biological imperative. The heat she was feeling, she knew, was Matt's cum - his 'sperm' as she called it, and as she taught Ellie to call it - and it was filling her womb. Millions of his little swimmers were shooting into her with each pulse, each one looking to create the new life she lied to Matt about, telling him it wasn't possible, the new life she planned lie to her husband about and trick into raising as his own.

"Oh... oh... ohhh... ohh..." Lindsey repeated like a mantra, letting the warmth spread inside her. Her eyes came back into focus and she saw her nephew again in the rear-view mirror. He was still looking down at his own cock tensing in regular intervals, pumping his seed into his aunt like fuel into the station wagon's gas tank.

He began to pull his cock out of her, just a few inches to get a better view.

Lindsey felt Matt start to slide out, not knowing he didn't intend to pull out completely. Both her mind and body - the part of her that hatched the master plan and the animalistic part of her awakened by feeling thick horse cock deep inside her - were in agreement. Her stud wasn't finished yet, and he couldn't be allowed to pull out.

"No!" she yelled, lifting her butt and pushing back hard. Matt was lifted off his hooves and slammed back into the cinder-block back wall of the store.

"Inside! All inside!" Lindsey yelled, still refusing to look back at her nephew. She'd pinned him between her butt and the wall, hands on the frame of the station wagon to give her more leverage. Her stud was trapped now, no choice but to finish filling her with every drop he had.

"That's it... good boy... good boy... good boy..." she exhaled, relief mixed with carnal pleasure. His pulses were much weaker now and she knew that he was almost finished. Soon his 'thingy' would soften and slide out of her on its own, but she was going to keep her inside as long as she could.

"Good boy... good boy... no, stop! Don't touch me!"

Matt, pinned between a concrete wall and his aunt's athletic butt, leaned his body forward and down so that it was pressed against his aunt's back. Before Lindsey realized it he was almost breathing in her ear, and his hands were reaching around her body to cop a feel of her boobs again. She grabbed her nephew's wrist and jerked it away from her chest. She covered her chest with her hand to protect it from her nephew's further advances, but Matt's hands went right back to her body, sliding lustfully over her washboard abs as an alternative to feeling her tits.

"Stop... Matt stop it! You're not allowed to touch me there!" She protested, not considering how absurd it was to tell the colt she had just allowed to creampie her and whose flared cock was still buried a foot inside her pussy that he wasn't allowed to touch her stomach. Still, she couldn't protect both her boobs and stomach at the same time with one hand, since she still needed one on the station wagon to keep him pinned against the wall.

"Matt... please stop... please..." she said weakly, her attention diverted from the indignity of her nephew groping her rippling abs. His cock was softening now, his flare gone, and now his retracting shaft was sliding out of her inch by inch.

It was done, Lindsey thought for a moment. Her devious plan to go outside her marriage to conceive a foal for her and her husband was done. She couldn't be sure, but she'd done everything possible, and there was a huge possibility - maybe even a probability - that she'd just been impregnated. She might have just been knocked up, right here in the back of the station wagon with the heavy scent of garbage in the air from the two dumpsters on either side of the vehicle. Not the most romantic conception, but Bob never had to know. Her new foal, sired by her sister's teenage son, never had to know.

"Guhh, hahhh..." Matt heard his aunt grunt.

His cock slid out of her entirely, drooping downwards like a wet noodle. In the same instant a torrent of his cum, which his cock had been keeping inside his aunt, gushed out of her like water from a fire hydrant.

Lindsey's hand shot from her breasts to her pussy, her instinct being to try to keep as much of Matt's precious cum inside her.

Now her knees buckled, and as she went down Matt was no longer pinned against the wall. He fell off to the side ignominiously, and there was a loud metallic clang as his shoulder hit one of the dumpsters.

He'd seen this from Jennifer before. It was mare physiology - sometimes she would cum right after his cock slid out of her and the obligatory wave of cum flowed out. It was her body rewarding her for a successful breeding.

"Aaahhhnn-hhnnhhh..."

Matt saw his aunt's entire body tense up as she came. His cum was dripping from between her fingers, despite how tightly Lindsey was gripping her own pussy trying to keep it in. A little stream of it was flowing from the seam between her middle and ring fingers. It took the path of least resistance, totally coating her wedding ring and channeling a steady flow of cum to the large diamond that symbolized her loyalty and fidelity to her husband. It dripped from the ring and the diamond to the asphalt.

Lindsey's legs were shivering, knees on the ground as her post-coital orgasm swept over her. Matt saw her hand finally drop away from her pussy, its task of keeping in all his cum impossible. Another gush of his seed spilled from her winking equine pussy onto the ground.

Slowly and in receding waves her orgasm passed over her and through her, until finally she was left with only the tranquil, torpid afterglow.

"Ahh... hahh... hahh..." she panted after her legs stopped shaking.

For a while Matt waited nearly motionless, propped against the dumpster, expecting his aunt to say something or do something. But she didn't say a word.

She didn't move or even look at him when his stood up off the ground and on his hooves again. Matt grabbed the pants he'd discarded earlier and put them back on. He looked over at his aunt, but she was still on her knees bent over the tailgate of the station wagon, breathing hard with her head wedged into the crook of her elbow, shirt on with no pants, her legs still spread and his cum still drip, drip, dripping out of her into the puddle that had formed underneath her.

Whatever, he thought as he zipped up and buttoned his loose-fitting pants. He shimmied between the station wagon and the dumpster, opened the passenger's side door and sat back in the seat. There wasn't anything he could do other than wait for Aunt Lindsey to recover. He wrinkled his nose after he got a whiff of the trash on either side of the vehicle.

For several minutes he waited until, finally, he saw in the rear-view mirror than his aunt was lifting herself up. Slowly and with noticeably weak legs she grabbed her own pants and put them back on. Matt stayed still as she lifted and closed the station wagon's tailgate, shuffled around her side of the car, opened her door and sat back down in the driver's seat.

Without as much as a glance of acknowledgment she turned the key and pulled out of the space between the two dumpsters where her 2ndchild had likely been conceived. Neither she nor Matt said a word to each other the entire ride home.

---

Lindsey spent nearly an hour in the shower after they got back to the house. She had avoided Matt the entire afternoon. That had been difficult, since he spent most of that time in the family room playing board games with his mom, Ellie and Jennifer. It was like he was totally unfazed by what had happened.

Dinner that night had been exceedingly awkward. Lindsey couldn't even look at Matt. Here was Bob, her loyal husband of many years, sitting at the table, joking and laughing like always. What would he say if he knew? While he was in the kitchen crafting a delicious meal for the whole family, she had been fucking a colt 30 years younger than him. Now her poor husband was serving food and smiling at that same colt who had cuckolded him just hours before. And Matt was acting like nothing was wrong!

Lindsey was so wrapped up in her own worries that she didn't even notice her daughter's strange behavior. While she wasn't able to even look at Matt, Ellie couldn't take her eyes off him. It never crossed Lindsey's mind that her daughter would see Matt as anything other than a cousin and friend. She didn't see Ellie was fidgeting and squirming in her chair, staring at Matt almost continuously. Today was the day for Lindsey, but it never occurred to her that_tonight was the night_for Ellie. Tonight was the night she would lose her virginity, and she could barely contain her excitement.

Lindsey took another shower after dinner. She was experiencing a deep sense of shame that she hadn't expected to feel. No matter how much she showered she still felt dirty. What was done was done and could not be undone. There was no going back. Her little nephew's sperm was inside her. Maybe she was already pregnant.

She decided that she needed to have sex with Bob that night. She told herself it would be a way to give him one last chance to get her pregnant instead of Matt, but really it was to create a kind of plausible deniability in her own mind. When the test said she was pregnant in a few weeks, it would be _possible_Bob was the father, right? Right.

It was time for movie night by the time she finished showering and went back downstairs.

"There she is! Mrs. Clean, Mrs. Clean, dun-da-dun-da-da-dun-dun!" Bob called up at his wife, singing his variation on a cleaning supply commercial. He didn't know why she had taken two long showers in the past few hours but he didn't think anything of it.

"Movie night! We almost started the without you, mom! We're watching 'Triassic Park!'" Ellie called up to her mother.

"Oh, that's a good one," Lindsey said without much enthusiasm, flicking the light switch and taking her seat on the couch next to Bob. Ellie pressed play on the VCR and went back to her seat on the other couch with her aunt, Matt's mom. In front of them on the floor for the 2ndnight in a row were Matt and Jennifer. Jennifer was sprawled out, her massive 8-foot frame leaning back against the front of the couch, and nestled between her legs leaning back against her was her little brother. A huge blanket covered them both. It would serve its purpose again tonight, shielding Jennifer's roaming, groping hands from view.

Almost the moment Aunt Lindsey flipped the light switch, Matt felt his sister's strong hands deftly and quietly pulling down his plaid pajama pants. By the time the dinosaurs made their first appearance in the movie her hands were exploring his body.

"So fucking horny... want it so bad..." Jennifer whispered as quietly as she could into Matt's ear, both hands converging on his hard, veiny shaft, stroking it slowly up and down. Matt exhaled, closing his eyes and smiling as his sister nibbled on his ear. He settled back into her, the most comfortable and accommodating seat in the house.

"Two more days..." he heard her whisper. Two more days before their relatives left and they could go back to fucking every night. Jennifer was counting the hours, assuming by the state of her brother's cock that he was just as pent up as she was. Assuming incorrectly.

She stopped stroking his cock, one hand gliding to his balls and the other up his stomach and chest. Just like the night before she wasn't trying to bring him to climax. She just enjoyed massaging his body, handling his balls and worshiping his cock. They couldn't fuck for another few days so this would have to do.

Uncle Bob's taste in movies proved yet again to be excellent, and the next few hours flew by for everyone in the room. Matt kept glancing over to his aunt, but her eyes never seemed to leave the screen. The only time she looked at Matt was the scene in which the actor Jeff Foalbloom delivered his iconic line, 'life, uh, finds a way.' Matt did not notice.

A T-Rex chase scene, a few dramatic escapes, several violent dinosaur-induced deaths and a thinly-veiled lesson about the folly of artificial genetic manipulation later, and the ending credits were rolling on the screen.

"Well kiddos, what did you think of _that_one? Pretty good movie, right?" Bob asked as he stretched and stood up from the couch.

"It was really good! The dinosaurs looked really real!" Ellie said.

"Definitely better than that gangster movie last night..." Jennifer said, helping her brother to stuff his cock back in his pants before they got out from under the blankets.

"I dunno, I think I like BadFellas more than Triassic Park," Matt said, guiding his dick down the leg of his pajama pants.

"You like it better 'cause you're a bad fella!" Ellie teased.

"Takes one to know one," Matt answered back, already knowing what Ellie would say next.

"You are what you eat!" Ellie said, finishing their inside joke.

"You two, you two. Silly, silly kiddo-saurs!" Bob said with a smile. "Any-hoo, it's about time to hit the hay, don't you think honey?"

"Yep," Lindsey answered tersely, already halfway to the staircase. She flipped the lights back on right as Matt was throwing the blanket off himself.

"Yep, yep," Bob repeated. He stretched and yawned as everyone else got up to get ready for bed, movie night over. "Big day tomorrow. Christmas day! Wonder what Santa's gonna bring..."

"We're too old for that, dad..." Ellie said, getting her blanket from the closet since she would be sleeping on the couch.

"Maybe so, but you get presents all the same!"

Talking about Christmas presents reminded Bob that the lights on the Christmas tree in the corner of the room were still plugged in, and they usually unplugged them before going to sleep.

"Leave the lights on, dad," Ellie said while Bob was walking towards the tree.

"On? That won't make it hard to sleep?"

"Just tonight. It's Christmas Eve, you know? It'll make it feel more... Christmas-y," Ellie said.

"Ah, more of the yule-tide spirit, a pinch of the old winter wonderland. 10-4," Bob said to his step-daughter.

"Mmm-hmm. And actually," Ellie said, thinking of how to make the mood in the room more romantic without her dad picking up on it, "could we also leave the stereo on tonight with that old Christmas music playing?"

"On? You can sleep all right with the music playing?" Bob asked.

"For sure. Quiet, not too loud, it's fine. More Christmas-y," Ellie answered, a justification that seemed sufficient for Bob.

"Okee dokee, Christmas tunes on, you're the boss!" Bob said in his usual, quintessentially 'Dad' way as he loaded the Christmas CD into the stereo system and hit play.

"Volume good?" he asked Ellie, turning the music down low.

"Perfect," she answered, the familiar lines about chestnuts roasting on an open fire coming from the stereo.

"All-righty, you're all set! Good night, daughter of mine! And good night to you too, Matt-o-saurus Rex! See you on Christmas day!" Bob said with a smile before making his way up the stairs, following his wife to bed.

Ellie tossed Matt his pillow and blanket from the closet while his mom and sister also started heading upstairs. Jennifer went up the stairs fairly quickly, saying nothing but giving Matt a look that only he understood. Just a few more days, she told herself, making her way to bed. Matt's mom waited for Matt and Ellie to finish putting their blankets on their respective couches.

"Night you two," Matt's mom said, turning the living room lights off once Matt and Ellie were underneath their blankets. The glow of twinkling, multi-colored lights from the Christmas tree provided plenty of light on its own for her to make her way to the stairs.

"Night. See you tomorrow," Matt answered to his mom.

Ellie and Matt listened to the clop of his mom's hooves as she walked to her bedroom door. They both heard the door creak and close shut.

Now everything was still and quiet aside from the Christmas music playing on the stereo system.

Ellie didn't move for several minutes. She was listening for Matt to say something, waiting for him to do something after what had happened between them in the treehouse earlier that day, but he didn't make a move.

For close to fifteen minutes Ellie waited, quietly watching the colorful dance of the Christmas tree lights. She was half afraid that Matt might be asleep, but also half afraid that if they got up to anything right after everyone went to sleep someone might hear them. But she couldn't take it any more. She was soaking wet and all she could think about was that massive 'weenie' she had in her mouth earlier that day.

"Hey... are you awake?" she whispered finally, as quietly as she could.

"Yeah. Are you?" Matt whispered back.

"Yeah," she answered simply, choosing not to ask why he would think she could talk to him while asleep.

She expected him to say something else, but he didn't. Another minute, maybe two ticked by. Another song started on the Christmas CD. The green and red and blue and yellow lights from the Christmas tree flickered on and off, filling the room with a warm, dim glow. The mood was right, the time was right. This was how she'd always imagined it would be for her first time. This was during the middle of her monthly 'super horny time.' Ellie couldn't wait for Matt to make a move. She couldn't wait another second. It was now or never, and never wouldn't do.

Ellie tossed her blanket off of herself, letting it fall to the floor. Still wearing the 'Shires do it bigger' shirt she'd had on all day along with only a thin pair of polyester Yumbro soccer shorts, she stood up from the couch and took the few steps to Matt's couch.

She was surprised when she saw, illuminated by the blinking lights on the Christmas tree, Matt was lifting up the side of his blanket as an invitation. Ellie didn't hesitate, sliding underneath with him, and she suddenly found herself laying on top of her cousin face to face, chest to chest, 'weenie' to 'cookie.'

For a moment she and Matt just looked into each other's eyes. Ellie could see the Christmas lights reflecting in them. Their lips were so close that she could feel the heat of his breath. Matt's hands had gone straight to her butt as soon as she flopped on top of him. She felt his hands squeezing her ass-cheeks, she felt his hard cock underneath her through their clothes.

"Hey, you..." she whispered in the kind of nonchalant, flirtatious way she had grown accustomed to around Matt.

"Hey..." Matt whispered back.

"Hey... I like you..."

"I like you back..."

"I like you back more..."

"How much more?" Matt said, playing the game along with his cousin.

"Lots and lots and lots..."

"Do you like me... this much?" Matt said at the same time he slid his hands underneath the thin polyester of his cousin's soccer shorts that she habitually slept in without anything underneath. His fingers traced the curve of her perfect teen ass before squeezing it with both hands.

"So much more than that. I like you this much..." Ellie said.

Already close enough to feel Matt's breath, she leaned forward a few extra inches. Their lips met, she felt Matt's tongue on hers, and less than a minute after crawling under the blanket with her cousin, Ellie and Matt were making out in the glow of the Christmas lights.

It was visceral, it was messy and frantic and lustful, both wanting to feel each other as deeply and fully as they could. They didn't need to play games any more, they didn't need to dance around the fact that they wanted each other.

Ellie relished the sensation of Matt's hands kneading her butt. He grabbed onto the elastic waistband and began slowly pulling her pants off, and Ellie accommodated, lifting her waist up off his. Matt's erection was so full that she felt it continue to press against her through his pajama pants even after she lifted her hips. When her Yumbro's were down to her knees she was able to pull one leg out completely, pushing her polyester shorts off with her hoof, leaving her wearing only her 'Shires do it bigger' family reunion T-shirt.

One of Matt's hands traced up Ellie's body. He was still fully clothed in his cotton pajama pants and a T-shirt, but Ellie felt him start to peel her oversized shirt up her body. Ellie went to pull it up and off herself, eager to get naked. They broke their kiss only when she had to pull it up over her head.

"That_is_lots and lots. But do you like me... this much?" Matt said to the now totally naked filly laying on top of him.

He gently moved his hand down the sides of her thick hips and to her stomach, then down between her legs, gliding over the her mons pubis and the bulbous ridge of her equine clitoral hood. He could feel the heat and the slippery wetness from her needy, hungry pussy, so ready to be filled. With two of his fingers he spread the puffy lips of her 'muffin' and slid his middle finger inside.

"Mmmm. I do like you that much, Matty-doo," Ellie said as her cousin worked a single finger inside her. "And a whole lot more..."

"How much more..." Matt said.

"This much..." she whispered. She could still feel Matt's gigantic arm-sized horse cock pressing against her bare leg through his pants. That just wouldn't do. She needed to free it and strip her cousin-turned-lover as bare as she was.

With Matt still fingering her she gripped the waistband of his pajama pants, pulling them down slowly. Matt lifted his butt up off the couch to help her, causing Ellie to have to lift her own butt up to make room. She pulled the soft cotton pants down, exposing the thick base of his hard shaft and his impossibly enormous balls, cradled between his thighs like two grapefruits in a bowl. When she got his pants down close to his knees she held onto the shaft with one hand, remembering what happened the night before, when it sprang up suddenly as soon as it was no longer hemmed in by pants.

"I like this too, Super-Weenie..." Ellie said whispered, now holding firmly onto Matt's shaft. Matt was able to wiggle his legs to kick off his pants entirely, pushing them against the couch's armrest with his hoof.

"You like it? How much do you like it, Ellie-Booty..." Matt said.

The next track from the Christmas CD started playing on the stereo, the familiar and appropriate 'Baby It's Cold Outside.'

"I like it this much..." she answered. With her free hand she lifted on Matt's hand, moving it from her pussy to her hips. With the other she maneuvered Matt's hard cock to the side and, lifting her hips even higher, under her leg and, then, allowed it to stand straight up against her naked body. She then started lowering her hips down again, pressing forward against the base of Matt's shaft.

"This much..." she repeated, lowering herself down onto Matt's body. His cock was now pressed against his chest over his shirt, pointing straight back towards his face. He looked down his body and saw Ellie's wet horse pussy on his cock, its puffy lips parting to straddle what it could of its girth.

"So nice and warm..." Ellie said, parroting a line from the song playing in the background.

Slowly she started grinding back and forth, rolling her hips gently hot-dogging Matt's cock. She was only working her pussy along a few inches of it, but she was so wet that she was leaving a trail of fluid shimmering in the multi-colored light of the Christmas tree.

Matt's hands wandered up her bare torso, over her stomach and ribs to her flat chest. He couldn't say a word of it to her, but he noted that she felt very similar to her mother, just a little less toned without the defined abs and without any boobs at all. He thought he liked big boobs when his sister was the only ones he'd felt, but he realized now that he liked his aunt's A-cups just as much, and Ellie's totally flat chest was just as nice. His taste in mares, he'd discovered, wasn't nearly as picky as he'd once thought.

"That much? That's a lot." Matt said, eyes on his cousin's pussy grinding on his dick, "but Shires do it bigger. Shires do it, do it, do it..."

"Shires do it, do it... oh, Matty, I want to do it so bad..." Ellie whimpered. Matt could hear the desperation in her voice. She wanted to fuck, and she wanted it right now.

"I want to do it too, Ellie..." Matt said, his groping hands feeling down her body again, down to her thick foal-bearing hips.

"I'm ready... I'm ready to lose it with you... our first time, both of us losing our virginity together... are you ready? Do you want it?"

"I want it," Matt answered without hesitation.

He never _lied_to Ellie, Matt could tell himself. She had just assumed he was a virgin like she was. Ellie didn't need to know that he had been fucking his sister every day for two months. Ellie really, really didn't need to know that he had fucked her mom earlier that day, filling the same hole she'd been born from with half a liter of cum.

"Take this off," Ellie said, grabbing the bottom of Matt's T-shirt, the only article of clothing either of them still had on. Matt quickly pulled it off himself, dropping it to the floor beside the couch, leaving them both completely naked.

"Ok... oh my god..." Ellie whispered. This was the moment she'd been thinking about for months. She stared down at the throbbing black horse cock she was sitting on, her bare 'muffin' right on it. The mood was right, the music was right, the lights and the timing were right. Most importantly the_col_twas right, her best friend who she'd known since she could remember, the one she trusted more than anyone in the world. Everything was perfect. They would share this magic experience together.

Matt stared hungrily at Ellie's pussy sliding up his shaft towards the tip, the same way he had looked at her mom's pussy earlier that day. His lip was doing that thing again, curling up on its own. Ellie was in heat, just like her mom, but Matt didn't understand. Ellie didn't either - as far as she knew, this was just her 'super-horny time' of the month.

"Oh my god... oh my god..." Ellie whispered to herself. She'd slid all the way up Matt's shaft, hips up near his chest. Now she held the very end of it in her hand. She pressed it gently between the folds of her equine pussy. It was dribbling precum, coating her fingers along with the juice from her own sex. This was it. This was the moment. One more inch and she would never be a virgin again.

"Shires do it..." Matt whispered up to her, sensing her hesitation. "Do it, Ellie. Let's do it."

"Oh my god, Matty, oh my... ohhhh..." Ellie moaned as the first few inches of her cousin's horse cock slid into her pussy, robbing her forever of her virginity.

"It's so big... oh my god Matty it's so big..." she panted. She'd stopped with only the tip of Matt's cock penetrating her - she'd never had anything inside her bigger than a hairbrush handle before now, nothing near the size of a regular stallion's cock, let alone the monster her cousin was packing.

"It's okay. You're on top Ellie, you're in control, okay? Go at your own pace," Matt said, trying to calm his cousin down. She may have thought it was his first time, but this really was hers, so Matt knew this wouldn't be the kind of wild, hard, balls-slapping fuck he was used to with his sister. This would be a slower, more sensual affair in the dim glow of Christmas tree lights with soft holiday music playing behind them.

There was another reason he was fine with Ellie taking it slow, too. When he woke up this morning he thought Jennifer's pussy was tight, but fucking his trim, toned Aunt Lindsey had shown him how much tighter than his sister's a pussy could be. Now, just hours later, his cousin's virgin pussy was showing him how much tighter it could get. It felt like a warm, wet vice was squeezing the head of his cock. Even just a few inches in, he knew that if he started fucking Ellie hard and fast like he did with Jennifer, he would cum in seconds.

"Okay... okay... oh my god it's inside me... oh my god..." Ellie whispered, her senses heightened and heart pounding. It was actually happening. This was sex. She was having sex. _Real_sex.

"Ellie. Relax. Just relax. It's me, okay? It's your Matty-doo..." Matt said to try to relax her. He saw her eyes come back into focus. They locked on his, and she was still for a moment. Then he saw her smile, widely, familiarly.

"Matty-dooo..." she cooed.

"Ellie-belly..." he whispered back.

"Guess what..." she said.

"What..."

"We're not virgins any more..."

"Oh my god..." Matt said, trying to sound sincere, trying to sound like this was a new experience for him like it was for her.

"Does it feel good?" she asked, seeking approval from her cousin, best friend and lover.

"Yeah, it does... does it hurt?" he asked her. He was worried she might not be able to take him more than a few inches.

"No. It feels really good. It's so warm..." Ellie said.

"Good. Good. You think you can take it deeper?"

"I think so..." she said.

Slowly, cautiously, Ellie moved her hips back. Inch by inch Matt's 'virgin' cock slid deeper into her, spreading her and exploring where no one had ever been before.

"Oh my god, Matt..." she exhaled. Now five inches of him were inside her. Now six. Now seven, half his total length.

"You're so tight..." Matt said, almost involuntarily and this time without any insincerity. He'd never felt a pussy like this.

"I gotta..." Ellie started, rolling her hips forward. She was wetter than she had ever been and precum was practically pouring from Matt, but she needed more lubrication to get him further inside her. She just needed his shaft to slide out some to coat it, then it could slide back in. A few inches of his cock slid out of her, then back in. Then back out. Then back in. Then out, in, out, in...

"Ellie..." Matt whispered, his grip tightening on her hips as they undulated, riding his cock.

"We're... we're doing it. We're really doing it. Oh my god, it feels... you're so big..." she said, as much surprised by her own actions as the situation.

"Shires... do it bigger..." Matt said, trying not to cum. She was so unbelievably tight that if actually were a virgin like she thought he was, he almost definitely would be on the verge of orgasm.

"Shires do it, do it, do it..." Ellie said, locking eyes again with Matt, "oh god Matty, I love you..."

Before Matt could respond to his cousin's use of the L-word to describe her feelings for him for the 2ndtime that day, her tongue was already in his mouth. He could unpack that later. For right now the fact that a sexy teenage filly was riding his dick while making out with him was good enough.

Matt again grabbed a double-handful of his cousin's ass while their tongues twisted and curled. She more than lived up to that funny superhero name from earlier, Ellie-Booty. Matt still couldn't believe how wide her hips had gotten in just a few years since they were kids. Puberty might have skipped over her chest for now, but it put in overtime on this thick, meaty ass. It had molded her lower body into a vessel for producing foals - all it needed was a colt to pump one into her.

"Mlahhh..." she sighed with wet lips, breaking their kiss, "it feels so good Matty... sex feels so good..."

"Can you take it any deeper?" he whispered to her. She was still going slow, and only half of his shaft was inside her at the most.

"I... I think so..." she said.

"Try it, go until you can't any more," Matt urged her.

Obediently she pushed further back into Matt's lap. Another few inches were inside her. Eight. Nine. She paused when his medial ring met her pussy lips.

"That's it Ellie, just like that... any further?"

"I think... maybe... ahhh!" Ellie whimpered, pushing back another inch before feeling a slight stinging pain and instinctively lifting her hips up.

"I'm sorry, that's as far as I can go... I can't do your whole weenie, I can only go to your ring-thingy..." she said, feeling embarrassed and hoping Matt wasn't disappointed.

"It's okay, it's fine. It's good. Only do what you're comfortable with, okay? Do whatever feels good..." Matt said.

In truth he was a little disappointed that he wouldn't be able to go balls-deep into Ellie like he had with her mom and had done more times than he could count with his sister. It made sense to him though, since Ellie was so much smaller than Jennifer and hadn't had a foal like her mom, which he supposed would also wider things out down there. In truth he didn't really know that much about it, but it still made sense. He was never going to shove his fist and arm into Ellie like he had with Jennifer, but that was fine.

"Okay... okay... whatever feels good..." she said, repeating Matt's words as she started rolling her hips again, riding his cock. "Oh Matty it feels so good... I'm so glad it's with you..."

She rocked and bucked on him harder, a little faster. It felt so much better than she ever imagined, but more than anything she was so happy that she was sharing this experience with Matt and not some random colt at a party. He made sure she was comfortable, he made sure she went at her own pace. He was the same colt she'd chased frogs by the river with and built pillow forts with in this very room when they were little. She trusted him. She loved him. Now, here, with him in this familiar room with the lights and the music - it was perfect.

It was _almost_perfect.

In her dreams of losing her virginity it wasn't her on top, riding a cock, it was always her on her back with a stud on top of her, taking charge and rocking her world. That's what sex was, right? And now that she and Matt knew how much she could take, she didn't have to worry about him going too far.

Matt was confused at first when his cousin lifted herself up. His slick cock slid out of her pussy, rebounding back onto his chest trailed by a string of their shared juices.

"What are you..." he started.

"Come up..." she said. Her words weren't enough to understand what she had in mind, but when her hands gripped his arms and she started leaning back, pulling Matt with her, he understood what she wanted.

"Get on top..." she whispered, dispelling any doubt.

They had been under the blankets before now, their incestuous coupling hidden, but by laying back Ellie was now on top of the blanket, laying naked on the couch. She spread her legs, pulling Matt up off his back as she leaned back onto hers.

"Let's do it like this..." she whispered.

"Yeah... yeah..." Matt answered, now up on his knees between his cousin's legs. She let one hoof drop to the floor, her other leg lifted high into the air.

The next track on the Christmas CD began to play, 'I'm Dreaming of a White Christmas.'

Ellie let go of Matt's arms. With his left hand Matt grabbed onto her ankle, just below her hoof, and with his right he gripped his cock. From his experience with Jennifer he knew his dick was too big and unwieldy to find pussy on its own - it needed to be guided into place. With one hand Ellie grabbed hold of the massive shaft as well, and together they steered it between her legs to her puffy, eager equine slit.

"Just like... yess..." Ellie breathed as Matt's cock slid back into her, no time wasted. He lurched his hips forward, thrusting into her nearly up to his medial ring, the limit he'd imposed on himself for how deeply he'd fuck her. Without waiting on another word from Ellie he started rocking his hips, his cock plunging in and out of his cousin's pussy.

Matt knew what she wanted, what she needed. This was her first time, and she thought it was his, but that didn't mean he had to act like it. Not any more. He wasn't going as hard or as fast or as deep as he would with Jennifer, but she wanted him on top. She wanted him to take charge. Just seconds after entering her, he was fucking Ellie in earnest.

"Oh god... oh god... oh Matt, oh, oh..." she started to moan louder than the Christmas music playing in the background. They were on top of the blankets, fully exposed in the multi-colored glow of the Christmas tree. If Lindsey or Bob or Matt's mom or Jennifer came down the stairs at that very moment they would be in full view, caught in the act, two cousins fucking on the couch, but they were both so lost in the moment that that risk never entered their minds.

Matt reached down to Ellie's body, his hand on the skin between her belly-button and pussy. He could feel it moving up and down rhythmically in time with his thrusts, distending slightly as his cock pumped in and out of her. His hand traced up her torso to her trim stomach, up to her flat chest, nipples without boobs.

"Hahh... hahh... hahh... hahh..." she grunted mindlessly as 'White Christmas' continued on the stereo.

Matt felt her grab his hand. His eyes had been locked on his cock plunging in and out of her up to that moment, but the way she grabbed onto his hand made him look up at his cousin's face. Their eyes met.

Something happened to Matt then that he hadn't expected. Looking down at Ellie's cute face, her ears twitching and mouth agape, he felt some kind of emotion that he'd never felt with Jennifer. This wasn't just a hot filly, this was his first and best friend. This was more than lust. This was...

Matt leaned down, his body flopping on top of Ellie's. It was like his body was moving on its own as their lips met again. He felt her moan into his mouth as their tongues danced. His hand found Ellie's and they gripped each other, their fingers entwining.

His hips were still bouncing on their own as they broke their kiss, a bridge of saliva connecting their lips for a moment, his cock sliding in and out of the tightest pussy he'd ever felt. It was winking uncontrollably to milk out the cum he couldn't hold in much longer.

"Matty... oh god, Matty, I love you..." he heard Ellie whisper.

Their eyes locked again, only inches from each other, both staring deeply into the other.

"I... I love you... I love you Ellie..." he whispered back, words coming out on their own.

He felt her hand squeezing his and he squeezed back. His other arm wrapped behind her head, pulling her closer, and her free hand went down between her legs. Matt felt her fingers around the base of his cock, though it was so thick she couldn't wrap her fingers all the way around it. His thrusts were shorter now, right up to the edge of his medial ring, 9 inches inside her with her hand around the remaining few inches not inside her little virgin Shire horse pussy. He could feel the tingling at the tip of his cock and knew he was seconds away from cumming.

"Ahh... Matt... ahh... hahh..." she moaned, louder than the Christmas music, louder than the wet _schlipp-schlipp-schlipp_of equine sex, black horse cock sliding in and out of her.

"Ellie... Ellie I... hnnnhhh...!"

With a final buck of his hips Matt thrust forward, his plunging cock halted only by Ellie's hand around the base of his shaft. The end of his cock flared, mushrooming out deep inside his cousin's pussy.

Ellie's eyes rolled back, her tongue drooping out the side of her mouth. It was the same reaction her mother had earlier that day when she had the same thing happened to her, when the same gargantuan horse cock flared inside her, stretching and filling her to her core.

Ellie felt the base of his cock that she had her hand wrapped around contract, flexing like a muscle. That was it, the point of no return, though she didn't know it. That was the first and largest ejaculatory pulse, sending a torrent of her cousin's seed deep into her womb at the time when she was most fertile, most likely to conceive, most at risk of dashing her mother's dreams of her becoming a world-renowned surgeon and instead becoming the first teen mom in her class at school.

"Ohhhh! Ohhhhhhh!!" Ellie moaned, loud enough to be heard upstairs.

Ellie's body shook and spasmed in orgasmic ecstasy underneath Matt. She felt a strange, fulfilling warmth spreading inside her, a carnal need she didn't know she had being satisfied like the quenching of a fire. The base of the horse cock she gripped firmly at the entrance to her sex twitched again, and again, and again, and with each pulse the warmth inside her grow. Her trim stomach was distending further, stretched first by Matt's cock, then the flare, then even further as more and more hot horse cum was injected into her. That was the warmth she could feel growing inside her, not a drop escaping, Matt's flare creating a water-tight seal against her vaginal walls. By the time he finished, the last of his pulses waning, he'd dumped half a liter of his incestuous cum into her. Her stomach bulged so much that it looked like she was several months pregnant.

The feeling was familiar to Matt - Ellie was the third mare he'd bred in as many days - but it was still intense. He was panting, Ellie was still quivering. Matt was still looking into her eyes, which he'd seen roll back as she rode out her crashing, all-encompassing orgasm. Now he could see them coming back into focus and, then, that familiar smile he knew so well reappeared.

"Oh my god... Matt, oh my god..." was all she got out. Sex was so much more exhilarating than she'd ever expected.

That's when she noticed, looking down her flat chest, that she couldn't see the base of Matt's cock any more. It was obscured now by her stomach, clearly bulging from the massive amount of cum that her cousin had filled her with.

"Wait... did you... inside me?"

"Yeah..." Matt answered in a way that suggested that cumming anywhere else would be silly. He always finished inside when he had sex, why wouldn't he?

"You spermed... inside me? You spermed inside my muffin?" Ellie asked, eyebrows furrowing with worry.

"Yeah!" Matt said nonchalantly, trying not to chuckle at the childish words she insisted on using. What was the big deal?

"But how... What if I... I could get pregnant!" She blurted out.

Matt rolled his eyes. In his own mind he was an expert on sex at this point, knowing all there was to know about it and the risks associated with it.

"No, you can't. Don't worry, it's totally impossible for you to get pregnant," he said with the false confidence of a teenager.

"What? How? You spermed inside me!"

Poor naive Ellie, Matt thought. She didn't know how things worked.

"I did, but it doesn't matter. Today is a safe day, so you can't get pregnant," he explained to her.

"Safe day?"

"Yep. Girls can only get pregnant on one day a month. Every other day is a safe day. So even if I cu... even if I 'sperm' inside, if it's a safe day it's literally impossible for you to get pregnant."

"And today is a safe day?"

"Mm-hmm. So it's not risky at all. We could have sex all day and I could 'sperm' inside you a dozen times and there's zero chance you'd get pregnant."

The wheels inside Ellie's mind were turning. She'd never heard of this before, and it flew in the face of what little she did know about equine reproduction. Still, she trusted Matt...

"How do you know it's a safe day?"

Matt couldn't tell Ellie the truth, which was that he knew today was a safe day because her mom had told him so when he fucked her that afternoon.

"Because of my sister... she told me one time that the unsafe day is like, around the 15thof the month, somewhere around then. That was like, a week and a half ago. So today is definitely safe."

"But that's _her_safe day..." Ellie said, quite reasonably even if the underlying information was incorrect.

Matt sighed. Poor, sweet, naive Ellie. She really didn't understand equine reproduction.

"It's_everyone's_safe day. All girls have the same risky day. It's like, coordinated or something. I dunno how it works, but that's how it works," Matt said, confidently wrong.

At some point, for some reason, Matt had got it into his head the ridiculous idea that all mares' estrus cycles were synchronized. That meant that, in his mind, if today was a safe day for his aunt Lindsey, it must also be a safe day for_all_mares worldwide. That, of course, included Ellie.

His cock was softening inside Ellie now, his flare beginning to shrink back to normal size and his shaft starting to retract.

"Oh... I didn't know it worked like that..." Ellie said. "You're sure?"

"Positive. Absolutely positive. You don't have to worry about anything," Matt answered, oblivious.

Matt saw Ellie purse her lips, her brow remaining furrowed. She didn't seem totally convinced, but she didn't have enough sexual knowledge herself to refute what Matt was telling her. Then she remembered something - a phrase she'd heard a few times before - and it suddenly all made sense.

"Wait... so does that mean we had 'safe sex?' Is that what that means?"

Matt had never considered it before, but he had also heard the term 'safe sex' once or twice without really knowing what it meant. Surely that must be it, right? That had to be it. What else could it mean?

"Totally! That's exactly what it means!" he said excitedly, without a clue how wrong he was.

Ellie's face lit up. Dangerously, disastrously wrong as Matt was, equating his version of 'safe days' with the phrase 'safe sex' made sense to Ellie and convinced her that he was right.

"That's... wow Matt, we really did it... we really lost our virginities to each other..." she said, quieter and more subdued, the brief panic of a pregnancy-scare having passed.

"Shires do it bigger..." he said.

"Shires do it, do it, do it..." she whispered.

Matt's cock continued to retract. In just a few seconds his flare would have shrunk enough so that it no longer sealed the half-liter of cum he'd just poured into his cousin, right in the middle of her 'super horny time,' right when she was in heat and the risk of pregnancy was highest.

The song on the stereo was almost over, the one about a 'white Christmas.'

"I'm so glad it was with you, Matty-doo. I'm so happy we did it together. I'm so happy we did 'safe sex'..."

At the moment Ellie said 'safe sex' the dam that had been created by the shrinking flare of the horse cock inside her broke. All at once, spurred on by pressure from her distended stomach, a deluge of cum spewed out from her pussy. It splashed against her hand, still gripping the base of Matt's shaft, feeling like the faucet from a bath tub at full blast and sounding like a hose splashing water in a garden.

Ellie looked down he body, her stomach no longer slightly inflated. The soft length of Matt's cock that has still been inside her was ejected along with the flood of cum. Her hand was soaked along with her thighs and most of the center cushion of the couch. They'd have to make an excuse tomorrow for why the couch was so wet.

"Oh my god... so much sperm..." she said. Though Matt had convinced her it was 'safe sex,' the shear volume of cum that had poured out of her made her realize how much must still be inside her. Still, she trusted Matt more than anyone in the world. He said it was safe, so it must be.

The clock in the living room struck midnight. It was officially Chistmas day.

"Merry Christmas, Ellie-belly..." Matt said in the twinkling lights of the tree. He'd made it a white Christmas for her, and he'd given her the first gift of the day, a gift that had every probability of giving her nickname a new meaning, one that would take 9 months to open.

"Merry Christmas, Matty-doo..."

---

Lindsey looked at the red LED display on Matt's digital clock as she bounced on her husband's dick. She was trying to stay as quiet as possible, but she needed Bob to cum inside her if her plan was going to work.

"It doesn't feel right... sorry sweetie. It just doesn't feel right doing this on his bed. It's really disrespectful..." he whispered up to his wife.

"Shut up... shut up and focus, Bob..." she demanded.

She grabbed his hands and put them on her naked chest, forcing him to feel the A-cup breasts that she had forbidden her nephew from touching earlier that day.

"You love boobs, right? You're a boob guy? Touch them. Here, like this. Feel them. Feel them for me, Bob. Feel my boobies."

She was struggling to keep him hard. That was always a problem, but she couldn't quit this time like she had so often in the past. He had to finish. He had to cum inside her tonight, she had to make him do it. There was no other way.

She was bouncing on him wildly, riding him as hard as she ever had. The springs inside Matt's mattress were squeaking, the bedframe creaking.

"Lindsey! What on Earth... not so hard! It's making too much noise! Jiminy Cricket, what's gotten into you?!" Bob whispered as loudly as he dared.

"I'm in the mood, does it matter? And it's the right time of the month! We're trying for a foal, right? We can't waste an opportunity when I am in heat just because we're not at home," she said, still bucking her hips.

"But... ahh... on our nephew's bed?"

She could feel him getting harder, finally, and his voice was wavering a bit. Just a bit more.

"It's so naughty... isn't it exciting?" she suggested to her husband despite knowing he was as vanilla as they came.

"Not really..." he answered.

"Well then, just focus on these," she said, her hands on his to force him to squeeze her small, pert tits.

"This doesn't feel right..." Bob complained again, not feeling at all comfortable having sex in his nephew's on his bed.

"Stop whining! I'm in heat! You want a foal, don't you? We have to try every chance we get!"

"I... I guess so..." Bob said. Lindsey could feel he was staying hard now, and he was groping her boobs on his own.

"That's it... good... just close your eyes sweetie, pretend we're at home..."

She was in the groove, rolling her hips mechanically and smoothly. In her mind she was framing this as cover for the foal that might have been sired that day by her teenage nephew, creating a believable scenario and timeframe for her husband so he would never have to question that it was his.

On another level though, this was a way for her to atone for cheating on him and betraying his trust. This was one last chance for her husband to sire their foal, one last opportunity for his sperm to win out over Matt's. In a way it could create doubt in _her_mind, too. If, in 9 months' time, she gave birth, who was she to say it _wasn't_her husband's if he came inside her on the same day? Despite the odds, despite the years of failure, there was a shred of a hope that he could be the legitimate father, and that would be enough for her.

But this was wishful thinking, far more than she even surmised. She had no way of knowing it in that moment, riding her husband's cock, but it was already too late.

It had happened while they were watching the movie that night. At the exact moment Jeff Foalbloom uttered the line 'life, uh, finds a way' and she had glanced towards Matt, one of the millions of sperm cells he had dumped into her that afternoon behind the Big-Mart found and entered her waiting egg. That was the instant a new life was conceived inside her, the precise second in which she'd been knocked up by her nephew.

Bob could cum inside her now, but that egg had already implanted itself in her uterine wall, cells beginning to divide inside his wife even as she rode his dick. His sperm would search in vain, for he'd already been cuckolded, the love of his life impregnated by another colt.

"I'm close... I'm close, honey..." Bob whimpered, eyes closed, pretending he was at home like his wife suggested.

"Yeah baby? Let it out... let it all out inside me baby..." Lindsey urged.

She kept rolling her hips, not changing her motion at all.

"Okay... it's coming, honey... here it comes... here it comes... ahhhhh!!"

Lindsey felt her husband's flare expanding inside her, a familiar sensation from all the years they'd been trying to conceive. But it was nothing like what she'd experienced earlier that day. There was no body-quivering orgasm, no sense of being filled with warmth. She felt ashamed making the comparison, but Bob's cock was nothing compared to Matt's. Bob wasn't small, he was just thoroughly average, and though she didn't want to admit it she knew that after having her nephew's monster inside her earlier that day, Bob's cock would never feel adequate again.

Almost as soon as he came Bob's flare retracted back to its normal size. In a few seconds he was soft, and his flaccid, retreating shaft slid out of her. There was no voluminous fountain of cum trailing it like there had been when she'd gotten fucked by Matt. There wasn't even a drop. Whatever minuscule amount of cum he'd put in her, if any, wasn't even enough for her to notice.

"We shouldn't do it on Matt's bed. We're guests. What if we stained the sheets?" Bob said.

Lindsey unceremoniously rolled off her husband. She thought about asking him 'stain it with what,' but though better of it.

"They're going to wash them anyway when we leave," she said.

"Yeah, I guess. Still..." Bob said, leaving the thought unfinished.

"Fine, we won't do it on the bed any more," she conceded, not wanting to fight her husband on this. She'd done what she intended to do, the scenario in which Bob could plausibly be the father of her foal having played out. That would have to be good enough.

She closed her eyes and sighed, trying and failing to put out of her mind what she had done that day. Getting railed unprotected and taking two creampies from two different guys on the same day - that was definitely a first for her. But it was for a reason. It was all for a reason, and that made it okay. She didn't have to think about it any more.

But she couldn't stop thinking about it. She couldn't stop thinking about that mammoth rod going deeper and spreading her wider than any stallion had before, the absolute monsoon of cum that poured out of her after Matt filled her up. Her husband didn't compare. He couldn't. She loved Bob, but she knew that after taking Matt's cock, Bob's would never be the same. Matt's cock had claimed her, impregnated her and ruined her for any others. She'd never have sex again without thinking about it, and when her foal was born she'd never forget who the real father was.

Lindsey had no way of knowing it, but at the same time she was riding Bob, trying to coax whatever orgasm he could out of him, Matt's cock - the same one she couldn't stop thinking about, the same one that had put a foal in her earlier that day - was plunging in and out of her daughter's pussy. Just a few dozen feet away downstairs, her daughter was losing her virginity to the same gigantic cock that put her husband's to shame. And at almost the precise moment Bob spurted his pathetic trickle in her, Matt's flare was ballooning inside her daughter and pumping her so full that her belly bulged. The only reason she didn't hear her daughter moaning was because Bob had to _tell_her he was cumming; she might not have noticed otherwise.

Lindsey sighed, opening her eyes and looking at the alarm clock next to the bed. The red LED displayed 12:05. Christmas day.

"Merry Christmas, Bob," she said.

But he was already asleep.