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The dalmatian girl sat tersely before her vanity mirror. There was no doubt in her mind now; she'd felt the extra weight on her back and shoulders early in the morning, but now it was fact. Her tits had swelled two, maybe three cup sizes. They simply didn't fit in her shirts anymore; she hadn't even needed to take her crop top off to reveal them to her mirror. It was humiliating having her tits falling out of her shirt around her little brother. Holly leaned back in her chair and cautiously watched the lewd faces her reflection was making as she fondled her breasts.

"Why is this happening," she whimpered. Even her areolas had become more prominent, and her nipples were enjoying her constant fondling far too much. Touching them was like the connection to an electrical circuit, or more aptly, a button straight to her clitoris, and the more it throbbed the wetter her panties got.

Holly was no prude; she'd fucked and sucked with the best of them well before college. But she had never before responded so violently to simple touch, especially not from herself, especially not from feather-light strokes and extra gentle squeezes. She thought for a moment that her face was hot and her reflection confirmed she was flushed, and she wondered if something might be wrong with her. But she had little time to contemplate, for not a moment later she heard a knock at the door.

"Holly?" came the voice of her little brother, Kyle.

"What do you want?" Holly called crossly.

"Can I come in? Please? It's important."

"How important?"

Thud! Holly could only presume he'd leaned into the door, and awfully hard at that. "Please!" he cried. "I mean it! It's important! I need your help!"

Holly sighed and pulled up her shirt. She wasn't wearing a bra, so the shirt itself wasn't really much cover for either her stone-stiff nipples or her boobs. Still, she figured, it was nothing Kyle hadn't seen before. She yelled, "Come in!" and transitioned to her bed, mostly so she could pretend he had bothered her in the middle of reading.

Kyle fumbled with the doorknob and then all but crashed inside. He too was flushed, and he gasped for air like a marathon runner. Holly was about to ask what his problem was, but then she gasped, and she didn't need to ask.

Holly was a little shaggy for your standard dalmatian, but she was a tall girl with the loveliest coat of perfectly round, black spots. Kyle, on the other hand, was liver-spotted and very freckled, and perhaps a tad too small for his age. Maybe that contributed to her shock, but the majority of it was the egregious sight of her little brother's erection all but bursting through his pajama pants. The bulge was not only monstrous in size, but it throbbed against the material violently enough to be a monster trying to scratch its way free. It send shivers from her neck to her clit.

"What are you doing in here -" she struggled a moment to cough up the right words, but she eventually managed it with an accusing point at her little brother's tented groin. " - like that?"

"That's what I need help with," he panted.

"You're shitting me." Holly felt like she'd taken a kick to the face. Kyle had always been the best brother; he was never gross to her, or disrespectful, or invasive, or any of the other numerous little brother sins she'd heard from her friends. Why would he do this? "Ugh! Go jerk off or something, jeeze!"

"I've tried! I've jacked off ten times in the past three hours, and I haven't gone soft the whole time."

"You liar!"

"I am not!"

"It's not possible." She shook her head and wagged a finger at him, as if she could merely scold her point into reality. "Dicks have a refraction period. You can't -"

"Holly, the proof is literally right there." Kyle gestured to his groin, and for the first time, Holly realized that in the middle of the fat bulge, a wet stain was crawling across the front of his pajama bottoms.

"Gross!" She pretended to recoil and shield her eyes, but actually, she peaked through her fingers, too absorbed in the hastening spread of the wet spot to ask herself why. Was it precum? She couldn't help but lick her lips.

"I can't stop it!" Kyle threw his hands in front of his crotch, and Holly felt the pang of disappointment in her heart and in her crotch. "It won't go down. I took a cold shower for twenty minutes and I got off twice during."

Holly's suspicions finally narrowed and locked onto a culprit. She remembered her brother taking pills from a purple bottle a few hours prior, and she had a sinking feeling she knew what those pills had been. "Kyle, you didn't take any of dad's pills, right? You know, the purple ones. Mom and Dad told you not to take any of their pills if they weren't home!"

Kyle squirmed uncomfortably and his pitched tent shuddered appropriately. "I had a headache," he admitted. "I might have fucked up."

"Oh my god." Holly threw up her hands, closed her eyes, and shook her head. "How many did you take?"

"Four or five. My head really hurt!"

"Oh, my god." She took a deep breath and counted to ten and told herself that she was going to wake up from this bizarre nightmare.

"Holly, look at it," Kyle whimpered.

She did. He had pulled his erection, knot and all, through the front of his pants. It was veiny and throbbing - had her little brother always been so goddamn big? Her forearm was smaller!- and it was deep red, just starting to tint purple. Seeing it caused a sensation in her that she didn't expect: a sympathetic throb between her own legs. The tank top tightly squeezed her tenderized tits and caressed her pert nipples and Holly knew she too was sexually frustrated to a breaking point.

Kyle said, "I think I need to go to the hospital."

Holly's heart fluttered as her little brother continued to gaze on helplessly at her. The fact that he was in this pathetic state, dick and tail between his legs somehow sparkled a carnal lust in her. She realized he was staring right at her tits and his nose was tingling with her scent, and that heightened the feverish feeling overtaking her.

Slowly licking her lips, she said, "God, if you do, Mom will find out you took Dad's boner pills on my watch, and she'll never trust me again."

Kyle unabashedly began weeping in front of her, gripping her door frame with one hand and gripping his penis with the other. "Holly, it hurts! I don't know how else to make you understand how bad it - aaahhh..." Holly gripped her thighs together. Her little brother was masturbating in front of her, his paws wetly and noisily stroking the swollen head until it oozed pre-cum on her carpet, and it made her pussy quiver to her core.

"I'm sorry, I'm sorry," he cried. He closed his eyes tight, too ashamed to notice that Holly had undergone an attitude change. "I can't stop. If I stop, it hurts." His paw was going fast and his lower abdomen was beginning to spasm erratically. He took his free hand from the door frame and allowed it to carelessly pluck his nipples, unaware that his sister was now doing the same. He panted, "Please help me; I can't take this anymore."

"Alright," said Holly.

"Huh?"

"Yeah, I guess you've really twisted my arm." Kyle opened his eyes just in time to see Holly stand and kick off her shorts, revealing tiny pink-striped panties underneath. She rubbed her slick cunt through them, reveling in the proof of her arousal before kicking them off in Kyle's direction. They both watched his cock bounce with anticipation, but still, he protested.

"Won't we both get in trouble for this?"

"Not if no one finds out," she assured him.

She spun around and crawled onto her bed, hands and knees, and then presented herself to her little brother. "Hurry up, just until you finish, and don't tell anyone." She peeled apart her vaginal lips, swollen and steaming with pheromones, and it was too much for Kyle.

"Oh god, Holly," he whimpered. "Uhhnn! Oh, oh, oh fuck!"

Holly looked over her shoulder to see her little brother gripping onto the door frame for dear life as his dick spat jet after jet onto her carpet. She rolled over to witness the erotic sight: the way his knees shook during the peak of the squirt, the way his chest heaved as it subsided, the way his eyes bulged as another pulse began.

Holly whined. She couldn't help herself; she leaned back and peeled her vulva open and gasped when she encountered her own flood. Hot - it was so hot, like sticking her fingers in boiling water! The relief forced a squeal out of her, and then she couldn't stop fingering herself in time with his orgasm.

The quiet, guilty noise coerced Kyle's gaze. Shamefully he gaped at the disgusting yet perversely titillating sight of his sister greedily cupping her own tits and fingering herself. Tongue dangling, Kyle gripped the base of his cock, and though he was nearly finished, it was enough to give what was left a sudden surge of life, and the last of his ejaculate sprayed across her tight crop top. Somehow she wasn't mad; instead, it prompted another submissive yelp.

Kyle leaned against her door frame. The orgasm had taken a huge toll on his energy, but as promised, his boner refused to flag. Kyle was beginning to feel light-headed from the blood rush, but the fiery lust had not abated.

"So, are you really still hard?" Holly asked.

God, was he! He wasn't quite at the same level of desperation as he'd been when he walked in the door, but he knew from experience it was only a matter of time before the urge became too much. "Oh, god, Holly, yes," he breathed.

"Wow, those are some pills, huh?"

Kyle, however, wasn't up to joking. "Is this really okay?"

"I don't know."

"It hurts still, but, fuck, you just saw me cum," he laughed nervously. "And look at it, look at how it's -" She was looking at it. It still throbbed from top to end of its veiny length. "I'm not lying. It's not enough to just cum. I don't think it's safe to leave my junk like this."

"Me neither." Holly hesitated. "So I guess even if you fucked me, it wouldn't help?"

"I guess so," he answered shyly. "I really did just want you to take me to the hospital, but-" Kyle didn't finish his sentence.

Holly shrugged and gestured to her shirt. "Looks like I gotta take this off anyway, you know?" she said. "If we're leaving, I can't go out like this."

Kyle burned red. The white t-shirt, covered in four or five thick streaks of cum, was downright indecent the way it clung to her tits. He imagined the musky smell was invasive as well. He didn't blame her. "Sorry."

She pulled up. Kyle felt his insatiable dick bob and his nuts tighten as the white cotton swept away to unveil her soft, rotund tits. The cool air was enticing to her nipples, swollen and as black as the spots that patterned her. He shivered in sympathetic timing with his sister.

"I had no idea they were so big," Kyle whimpered.

"They aren't usually. Today they have a mind of their own."

"Why are you doing this?"

"I don't know," she repeated. "I don't know what I'm doing." One shy hand reached up to cup her breast, and she fondled it slowly, burning her stare into Kyle. "Do you like that?"

Kyle's hand began to stroke on its own accord. "Fuck, yeah."

Holly spread her legs, still fondling, now with both hands. She didn't even need to ask if he liked that; his erection answered for him, letting loose a potent stream of precum almost as hard as a stream of piss.

Holly partly laughed and partly scoffed at him. "I can't believe this! Did you cum again?"

Kyle chuckled nervously and released his hold. After that last embarrassing display, he wanted to last long enough to at least touch Holly. "No, it was precum. That's actually pretty normal for me; it just happens sometimes when I'm really turned on."

"Oh." Her finger disappeared inside her to its knuckle as easily as you please. Kyle could hear the accompanying wet squish as if it were screaming to him. He couldn't imagine how blissfully warm and wet that lucky digit was; he'd never come so close to sex before. Despite himself he oozed even more, this time all over his own stomach.

"Are you always so, um, leaky?" Holly giggled.

"Not like this, but dad's pills might have something to do with it. Sometimes-" Kyle considered not finishing his sentence, but the lewdness of his nude sister splayed out in front of him, legs open, convinced him. " -the first time I saw you in a bikini, I precame so much it leaked through to my jeans. Later, when I came while thinking about it, it reached the ceiling."

Holly squealed again. "You dirty little shit!" But she felt, and he saw, her thighs twitch at the thought. "So you've masturbated thinking about me?" she asked coyly.

Kyle, who had never told anyone these things, felt a sense of relief unloading, even amidst the bizarre situation he found himself. "No; I usually just cum a lot, without stimulation."

She scoffed. "You're such a dirty liar!"

"Really! I used to have to wear condoms to school or else I'd come home drenched every day. Before that I needed three pairs of underwear. Sometimes I've cum during really inappropriate moments," he admitted. "I couldn't help it. I never told anyone."

Holly couldn't believe it, and yet, she had to. "I have the same problem. All I have to do is squeeze my thighs just right. I used to change my panties a million times a day. Sometimes during dinner-"

"Oh, fuck, during dinner!" he laughed.

"-- when Dad is just going on and on and on -"

"And you're sitting there trying to think of something else just so you don't die of boredom."

"Of course, you start thinking dirty, and before you know it, you spend the rest of the twenty minutes of dad's lecture orgasming and trying to keep a straight face," she finished.

"I've cum on the underside of the table more than once. Sometimes it pokes out of my pants without noticing."

"Once I squirted on Mom's leg and she asked if the cat had licked her."

"In a manner of speaking, it did."

During this whole exchange, Kyle moved closer and closer to Holly until he could just about touch her. She looked better than he'd ever dreamed, and it was because she was really there. The scent of her up close made him feel faint with desire, and he could feel her desire radiating off of her in waves.

"I can't believe what a dirty slut you are," Kyle breathed.

"Me neither. Let's fuck," she growled, and she pulled her surprised little brother on top of her. She wrapped her legs around his waist, pulling his fat, sobbing cock against her crotch to let him feel just how wet and welcoming of an offer she was making.

For a moment Kyle's eyes rolled into the back of his head, but still, he pinned his ears back. "But there's no way I can pull out in time, and a condom will break. I don't wanna, you know..."

"You said you've come ten, now eleven times, right?" Holly asked.

"Yeah."

"You almost definitely don't have any sperm left," she assured him. "Even if you can have multiple orgasms, sperm takes hours to regenerate. So we're safe. I mean, if you have to do it," she amended. "If you have no other choice, given your condition and all."

"Is that a fact?"

"It's common scientific knowledge," she replied. Holly's ears were pinned back too; she was nervous, they both were. But Kyle was sure about two things: Holly wanted his cock in her, and she was okay if he came inside. There wasn't anything else stopping him, right?

Kyle climbed on top of Holly and she tightened her leg grip around him. His tip found her entrance like two magnets colliding. They both whimpered as their sexes touched for the first time, his a stone rod and hers a sopping cavern, and then with no pretense, Kyle pushed inside.

Bliss! Euphoria! Nothing could describe that first virginal thrust into a wet and welcoming cunt. Holly not only knew it, she needed it, and she raised her hips to guide him as deep inside as anatomy would allow. She watched her brother's innocently expressive face with a wanton lewdness that made Kyle drool all across her chest.

Within a few seconds and a few pathetic thrusts, Kyle unloaded again, this time plunged as deep as he could into her pussy. His tip had asserted itself through her cervix, lodging itself safely inside to give complete access. Seconds later his knot was fully embedded in her, slipping in almost effortlessly with her streaming lubrication, and still he continued to thrust, the sensation too intense for words.

Holly barely had time to be disappointed by his quick load before she was cumming herself, legs twitching and stomach clenching in the unexpectedly fierce waves beating against her. It suddenly hit her just how massive his knot was! The hot bulbous flesh massaging her g-spot was unbearable; she had never taken a knot that could fill and knead her precious organs so vigorously. She clawed into his back until the whimpers waned, and already she knew it was the greatest fuck of her life. Every other dick paled in comparison to the way her brother's so gently and yet so thoroughly filled her, and she had never wanted it so bad!

They both gazed into each others eyes, their senses hyper-focused. Suddenly they were kissing, hungrily, and Kyle was gently handling her achingly tender breasts, and one orgasm wasn't nearly close to enough. He kissed down her neck and sucked her nipples, and Holly held his head and gasped with flushed cries. His hand slipped below and thumbed her clit, and still his dick seemed to grow inside her, basting in the combined heat of their juices.

The assault kept coming. Kyle never let his knot get more than halfway out of her; he rammed into her womb and squirt his seed nigh continually. Holly's greedy cunt had turned itself attentively to milking and squeezing Kyle's seed from him. She felt his warmth blooming in her belly, slowly smoldering, and in minutes there was a prudent bulge visible. It burned from her abs to her tailhole, and still she could feel his erection jutting into her, not for a second losing its rigidity.

"I can't believe you're still hard," she panted.

"You and me both." Neither of them sounded disappointed. Neither of them were.

Though it was difficult without pulling out, Kyle somehow rolled and changed positions with Holly. Now she sat on top of him and he sat straight against her wall for the pleasure of being buried in her soft, bouncing tits. Kyle wasn't even thrusting yet, but Holly couldn't stop grinding her hips, compulsively driving herself against his hard length again and again enough that she quickly and loudly came. And this time, Kyle had the pleasure of a front row seat to the sight of his infallible big sister drooling in mindless orgasmic disgrace.

The two fucked relentlessly. Holly's stomach soon swelled enough to accommodate a large watermelon, and she felt the strain of it in her back, on her organs, and everywhere in between. And god, the hot cum spilling inside every last crevice inside her! She didn't know how much longer she could last, but finally, Kyle pulled out of her with a shuddering cry. There was a moment of reprieve as the removal of his dick gave her some breathing room, but in an instant it was shattered.

Semen flooded from her gaping pussy, her legs thrashing in time with the forcible contractions vomiting up the viscous white goo. In moments, the bed was soaked from pillows to sheets in Kyle's plentiful seed, and Holly, still periodically squeezing out another serving of sperm, still sporting an unwieldy belly full of baby batter, couldn't stop cumming.

Kyle couldn't contain his excitement at the sight of his cum pouring from his sister's cunt shuddering. His hips involuntarily twitched, pumped, and - almost as if on accident - his softening dick slipped discreetly back into Holly. He sat up straight and held her tight, burying his muzzle into her supple breasts, gently nuzzling. Neither of them realized that the door to the bedroom was open, and it had been for some time. Their parents were both watching them with placid, approving smiles.

"I'm glad you two took care of business on your own," said their mother. "We were trying for ages to decide how to tell you -"

"Mom?!" they both yelped. They thought about running for cover, but what was the point? The intoxicating scent of unrestrained passion was suffocating the room. They were caught.

"I convinced her it was easiest for you to just figure it out," said their father.

"Figure what out?" said Holly.

Their father sighed. "Unfortunately, I can't make any more children. Your mother's odds are pretty low, too. But we always wanted a big family."

"Huge! I want dozens of babies and grandbabies to cherish," cooed their mother. "Kids, I cried for months when I learned we couldn't have more children ourselves. But then we realized, well, we have a son and a daughter, don't we?

Kyle gulped. He said, "So, wait a second. Are you saying you..."

"Yep. We've been planning around Holly's cycle for months. Today she's at her peak heat; she's almost sure to get pregnant. So we induced a migraine in you at breakfast to make you take a ton of aspirin. Of course, that's not what it was," he finished with a smirk.

"You planned for me to get pregnant?" Holly asked incredulously. "And for Kyle to be too horny to resist?"

"We love our children more than anything in the world," said their mother, "and all we want is more children to love. We'll take care of all your needs and theirs. If you want to still go to school and have a job, that's fine! Soon your siblings will help out too, when you have another litter after this."

"A litter after this?!"

Kyle shyly wagged his tail and spoke up. "I mean, Holly, you're almost definitely pregnant already. Why not be excited? I can't wait to see the pups. Will they have black or brown spots? How many will there be?" As he spoke, Kyle's erection began to reignite. He thought of the way his pointed tip had prodded its way inside her guarded womb. Yet, despite its resistance, it had taken and expanded with his every gush of virile seed. He thought of how Holly had begged, practically pleaded for him to fuck her. Had she subconsciously wanted to get pregnant?

Kyle's semi had given Holly some breathing room, but at full mast, the fullness of his meat injection allowed her to consider nothing else. She began a slow grind, and before they knew it, Kyle was thrusting again, first slow, and then with a purpose. Neither of their parents had left the room; they simply watched their son begin to breed their daughter anew. Kyle knew this of course, and he made a vow to both of them, and to his sister. "I'll keep breeding sissy's pussy until she's full of my puppies!"

Holly couldn't have refused if she had wanted to; her cunt was a fever and Kyle's dick was the cure. She had forgotten her parents were in the room in lieu of her brother's renewed thrusting. Her clit, stiff and suffering, throbbed with every chance veiny stroke. A fully devout mate, Holly greedily spread her legs apart and bounced on Kyle's cock until her bed was screeching nearly as loud as she was moaning.

"She already looks pregnant," chuckled their mother. "My, that tummy! He must've cum in her a lot. I hope they're okay."

"Let them be," said their father, finally closing the door on them. "It's going better than we'd hoped."

Sure enough, in one month's time Holly had yet another bump. She was staggeringly heavy with pups. She was as excited about the litter as her gentle partner Kyle and their doting parents. They promised to love and cherish her and every one of their progeny, however many there were now and however many there would be.