Simpson's Treehouse of Horror XXX
Millhouse's torn and bloody face looks into the Camera, his glasses askew as he smiles. "Thank you for joining us tonight, The following show is not for the faint of heart....speaking of which." He picks his up from the floor and puts it into his pocket. "The show contains things that no child should see....let alone you adults..." He suddenly screams and runs off camera, followed closely by Santa's Little Helper.
It had been quite some time since Marge had run over Flanders, turning their quiet suburban life into a run through hell for that week. It had left Homer very much dead and Bart with a nasty bite on his calf. Flanders had turned up a couple days later alive and well vowing to Marge to make it up to her, that was at least after she stopped screaming in terror. Within a week Marge, Lisa, Maggie, and Bart were moving into a large cabin on the edge of town, while Maud, Rod, and Tod moved into an insane asylum thanks to them screaming about a known to be dead Ned talking to them. Ned showed up not too long before the next full moon, convincing them that he had turned Bart as well. Ned had shaved, no longer needed his glasses, and completely changed his hair around so that the Simpsons even had a hard time recognizing him.
Over the next seven years they turned into a happy family, even though the two men had a tendency to eat someone on a full moon. Bart and Lisa had grown very close as brother and sister, especially after he had nearly killed Jimbo and Erny when they tried to haggle Lisa out of her lunch money. Bart had even offered once to give Lisa a small bite to turn her, but she had quickly turned him down. Lisa was still top in her class, while Bart had turned his grades around some to average out at middle to high B's. None of the three children had any worry about the family income, mostly since Mr. Burns paid Ned a fat weekly check since he had turned him on his death bed.
Lisa rummaged through clothes after getting home from Bart's graduation dinner, stripping off her dress before looking at herself in the mirror. She stood about five foot three with her blonde hair streaming down around her shoulders, her hands slowly went to cup her average chest. She quickly put on a pair of pajama pants and a pink tube top, since there was no need in modesty since they were home. She went downstairs and smiled as she watched her aging mother hug Bart, almost chuckling as she watched Ned walk into the cabin wearing his cross necklace again. Her eyes wandered over Bart for a moment, smiling as she watched her hulking brother shake hands with Ned. "We're gonna miss you guys." She quickly hugged her mother, before shaking Ned's hand. "Have fun at the lake."
Bart locked the door after their mother and Ned left, following the rules Ned had left for them. He turned to face Lisa and smiled some at what she was wearing, though he was only wearing a pair of stretchy pants. "Ned is going to turn mom tonight, he said she finally gave into his offer."
Lisa chuckled as she moved over to the computer, powering it up as she looked back at Bart. "I'm actually amazed it took this long, especially since they screw like animals almost every night." She forced away the image of their mother and Ned screwing, though a light blush came to her cheeks. "Out of just statistics he should have changed her by accident by now."
"I know that sis, but you know Ned is excruciatingly careful about that now." Bart checked his watch and sighed, knowing he only had an hour before moon rise. "I'm going to take a shower, be sure to check on Maggie. I put her to bed a little bit ago, Kitty is with her too." He said as he leaped up the stairs.
Lisa chuckled to herself as she moved towards Maggie's room, thinking of the Timber wolf she had named Kitty at the age of four when Bart had rescued it. She gently opened the door and smiled as she saw the nine year old curled up, hugging Kitty like a giant teddy bear. She moved back to the living room and got on the computer, figuring she could check a few sites before Bart got out of the shower. She logged into her account and typed in a few different passwords, before her list of favorites finally popped up. Her virgin folds dampened as she logged into one of her favorite sites, letting her free hand dip into her pajama pants. She slipped her headphones on as she opened a video, her hand diving back to her folds as she knew her brother's showers would normally give her ample time.
Bart finished his shower and dried himself, before wrapping the towel around his waist. "Ten minutes to spare..." He said as he checked his watch, turning his head some as his keen ears picked up a soft moan. "What is Lisa doing?" He gently opened the door and made sure not to step on the creaky floor boards as he moved to the stairway. His jaw dropped as he saw his sister sitting back in the computer chair with her hands stuffed between her thighs, quickly noticing she had headphones on. He silently crept down the stairway and moved behind her, the sound of his named being moaned stopping him short of her. As he got right behind her he watched her entire body tremble, knowing she had just came. His mind began to get very clouded knowing he hadn't gotten laid in a good while, making images speed through his head of Lisa on his cock. He decided to give it a whirl as he watched her slump back in her chair, her scent causing his cock to grow stiff.
Lisa slumped back in her chair reveling in the afterglow of her orgasm, until she felt a hand come down on her shoulder. Her eyes shot open as she looked up, blushing madly at the sight of her brother's smiling face. "How long have you been there Bart?" She pulled her hand from her pajamas as she turned to face him, feeling him quickly grab her wrist.
"Lisa...you know for being the smart one, you have no common sense sometimes." He leaned down and licked at the juices from her hand, finding that the tasted somewhat sweet. "You finger yourself silly and then moan out my name...on the first night of a full moon." He could feel the heat flooding through his body as he spoke, watching her eyes almost bulge as she knew he was right.
Lisa's mind ran rampant as she had failed to realize tonight was going to be a full moon, she opened her mouth to protest but found her words failing her. She felt his hand heat up against her skin, making her look up his sculpted body to his face. She decided to give into her lust and desires, yanking her hand from his grip. She had done that just in time, watching as her brother's body quickly changed before her. She watched as the towel fell away from his now furred body, revealing his twelve inch long and three inch thick canine cock to her. "My big brother, what a huge cock you have..."
"All the better to fuck you with sis..." He said before he reached down and picked her up, tossing her over his shoulder caveman style. He moved for the stairs and pulling down her pajama pants as he went, before he gripped her ass with his clawed hand as he climbed the stairs to his room. After a moment he dropped her down onto his bed, pulling her pants the rest of the way off her legs. He loved the view as she spread her legs and yanked off her tube top, revealing her perky breasts. He ran his claw tips over her bare slit, watching her shiver as he looked down at her. "Get on your hands and knees Lisa, mine as well do this proper since I'm like this."
Lisa rolled over onto her hands and knees, shivering again in anticipation as she felt Bart's claw tips run along the curves of her hips. "Now be a good big brother and fuck me like a bitch in heat..." She said as she spread her legs some, feeling his strong hands grip at her hips. She shuddered as she felt the tapered tip of his canine cock spread the lips of her pussy, only to feel him stop as it pressed into her some. She bit her lip as he suddenly lunged forward, stretching her tunnel to fit his cock. She bucked back against him as his second thrust pressed against her g-spot, hearing him grunt as he thrust into her again. Her jaw slacked as his final thrust pushed him through her previously abused cervix and into her womb, causing her to crash over the edge as she came around his cock.
Bart held Lisa's hips tightly as he let her ride out her orgasm, feeling her inner muscles clamping and milking at his cock. "Yep Lisa...you sure fell off your horse last week, and right onto his dick. Didn't you?" He asked as she finally came down from her high, watching her breath heavily as she blushed and nodded. He pulled himself nearly free and then slammed himself back into her, his knot slamming against her clit. He started to thrust into Lisa with surprising force and speed, grinding his knot into her pussy with each thrust. Her moans and cries of pleasure only drove him on, starting to pant as he picked up his pace.
Lisa was bucking her hips back to meet her brother's thrusts, nearly screaming out in pleasure each time his knot slammed against her clit. Pleasure racked her brain as she came once again, causing her pussy to try to clamp down on his cock. She shuddered as she felt his sharp fangs graze her shoulder, her mind not registering what he meant to do to her. Her legs grew weak as she kept feeling the tapered tip of his canine cock push in and out of her womb. She knew he wasn't as long as the horse, but he was sure as hell making her cum more. She felt his thrusting start to go erratic and started to use the last of her strength to slam her hips back against his thrusts, trying to make him cum.
Bart pulled himself almost totally free, before he gave one last brutal thrust into Lisa. He felt her abused pussy stretch over his knot, hearing the funny plop sound as it slipped inside her core. He lifted Lisa's body back against his own as he started short fast thrusts up into her body, while his large clawed hands kneaded and pinched her nipples. He felt his heavy sack pull tight against his body, sending a surge of hot werewolf cum up through his pipework. He raised his head up and let out a roaring howl as he came, before lowering his maw down to bite into Lisa's shoulder lightly.
Lisa's mouth hung open in a soundless scream as she was suddenly filled with her brothers cum, the pain and pleasure of his bite only causing her to cum harder. She could feel every new surge of her brother's hot seed pump through his shaft, fighting the blackness off as she fought to stay awake.
After a moment Bart collapsed onto the bed, laying on his back with Lisa atop him. He lovingly licked at the bite on her shoulder while he panted, listening to her heavy breathing. "I love you Lisa..." He said softly as he rubbed at her lightly swollen stomach, while he felt her body already starting to warm. "And Welcome to the pack..."
"I love you too Bart." Lisa smiled as she heard his other comment, her hand going to her already healing shoulder. She felt his strong furred arms wrap around her lovingly and decided to enjoy it until her change took her. She heard the creak of the floorboards outside the room and decided to let it slide for now.
About fifteen minutes later a now fully changed Lisa grunted as she felt Bart's knot pop free from her pussy's grip. She smiled as she felt only a small trickle of their combined juices escape her abused hood, slowly getting to her paw like feet. She heard the creak again, only this time followed by a soft whimper. She stopped at the door to take a quick look over herself in the mirror, smiling as she noticed she had grown a cup size. She smiled seeing her entire body had a nice coat of sandy blonde fur, running her clawed hands through it for a moment. She moved to open the door, ripping it almost from it's hinges. What she saw made her tail flag, while her maw dropped in surprise. "Maggie?!"
Just outside the door laying on her side was another sandy blonde werewolf, her maw hanging open and her eyes glazed as she looked up at Lisa. Kitty was laying with his front legs still wrapped around her, licking the back of her neck lovingly. The two of them looked up at Lisa's new body, afterglow still glazing their eyes. Their attention then went to Bart as he walked up behind Lisa, though unlike Lisa he was smiling down at them. "You guys woke us up..." Maggie said before letting out a soft yawn, the warmth in her belly making her tired again.
Lisa turned and licked Bart's muzzle lovingly, before hearing the pop of Kitty's knot coming free. She turned to see him cleaning up between Maggie's thighs, finding herself some one turned on at the sight before her. Lisa leaned down and picked up Maggie, feeling her nuzzle into her shoulder. "Lets get you to bed little lady..." She said as she started for Maggie's room, with Kitty at her side and Bart on her heels. After reaching Maggie's room she laid her sister on her bed, before getting to watch Kitty join her. She and Bart watched as the two got snuggled together, before heading back up to Bart's room.
Three days later Lisa walked into her and Bart's room with a horridly beaming smile on her face, that made Bart raise a brow. He chuckled as he listened to his mother's joke on the phone. "Love you too mom, and don't worry I'm sure Lisa will be thrilled." He paused for a moment, noticing his Lisa looking anxious as she sat down on the bed beside him. "Ok...we'll see you in the morning then, Love you mom...bye." He hung up the phone and sat it down on his nightstand, turning to look at Lisa with his own smile. "It's official...Maggie's not gonna be the youngest anymore." He heard Lisa giggle and noticed her holding something tightly in her hand. "And what's got you so antsy sis?"
"I finally found out how Maggie got bit....you did it in your sleep two months ago. She's been hiding it ever since. Luckily for everyone she hasn't had her first period yet...." She tried to think of how to tell Bart, that beaming smile returning to her face. "And do you remember how when women live in the same place for a long time their cycles sync together?" She watched Bart roll his eyes, before it clicked in his head. She opened her palm and showed him the test, watching as his mouth dropped open at seeing the positive sign. "Congratulations Bart, your an Uncle and a Father...." She trailed off as he suddenly grabbed hold of her head, returning the deep passionate kiss he gave her.
After what seemed like an eternity Bart broke the kiss with Lisa, his hand moving to rub her lightly swollen stomach. "You know something sis....we've got one fucked up family." He said before they both burst into laughter, the test strip falling to the floor as they held one another lovingly.
/// this is going to be a one shot me thinks, couldn't get it outa my head till I wrote it.