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Coming Between Twins	By : FairySlayer Category: +G through L > Gravity Falls Views: 22662 -:- Recommendations : 2 -:- Currently Reading : 0
Disclaimer: I do not own or have any association with Gravity Falls or Disney and I receive no compensation for this story. Alex Hirsch would probably kill me if he saw this.

Chapter List
- 1-Coming Between Twins
- 1
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It had been an extremely slow day at the Mystery Shack. No customers, not even to use the bathroom. And Soos had to drive Stan to Home Disimprovement to get rotted- and rusted- looking supplies to make the place a little more foreboding. The curmudgeon's tourist trap had become a much more joyful place ever since the precocious twelve-year-old twins Mabel and Dipper had arrived, and that wasn’t good for this kind of business.

So Wendy, the tall redheaded teen who "worked" there had been napping, leaning back in her stool, feet up on the high counter and her lumberjack hat pulled down over her eyes. She stirred when she heard bickering and occasional yelling in the distance. At first she put it out of her mind like she did with her brothers at home. However it was getting harder to ignore the commotion the kids were making as it grew ever louder.

“Well I found it so it's mine!” Mabel nearly roared.

“But I’m the one who knew where to look for the Citrouille d’Amour from the book. I could have gotten it myself, but like always you had to come along, and now you want to steal it from me!” Dipper growled.

At first Wendy just thought annoying kids, but then she snapped awake and sat up. She couldn’t believe those two could ever get so mad at each other. Sure Mabel and Dipper sometimes disagreed, but different as they were they rarely argued, and never so loudly. Though from the sounds of things this was heating up quickly and could easily turn nasty.

The thing was, Wendy had come to really like them. A lot. Dipper had a crush on her and would do her work for her, and Mabel was a real card, always finding ways to make her shifts more fun. Even when the twins attracted trouble it was usually the fun kind, or at least interesting. And Wendy was also a little jealous of their close relationship. With a gruff father and four brothers she was usually the odd one out. She'd never been close to anyone like these kids were, not even with her best friend Tambry. Wendy longed for that closeness too, sometimes finding herself wishing she, Dipper and Mabel were triplets.

“... well, when we get upstairs I’m drawing a line down the center of our room!” Dipper shouted.

“Fine, but Mr. Glowy Face will be on MY side!” Mabel screamed back.

Hearing them fight made the redhead sad, even a little disillusioned. She smoothed her hair back underneath her cap and got up to open the door. Rather than knock their heads together like she would at home, she loudly but pleasantly said, “Hey dorks!” She faked a smile. Mabel and Dipper glared up at her and Wendy continued, “What’cha two got there?” They didn’t answer and instead started shoving each other as they came inside. Or tried to.

Wendy couldn’t hold in her laughter as the two tried to walk through the door at the same time, jamming themselves into the doorway Three Stooges style several times in a row. They’d stop and glower at each other. Their cheeks were getting redder and their eyes narrowed, so Wendy grabbed them by their upper arms and yanked them inside. The redhead figured Dipper would gladly let her pull him towards her and then Mabel would follow. But she only ended up jamming them in the doorway even harder. Frustrated, she shoved them both back and grabbed the wagon’s handle, pulling it into the shop before they had a chance to get over the shock of being tossed around.

Wendy pulled the wagon to the middle of the store and waited as the two petulant children scrambled inside after it. Then Wendy saw what was causing all the trouble – It looked like some ugly misshapen black ball, but then she realized it was actually a large pumpkin, all black. Probably from being out in a frost. There shouldn’t be frost in summer, nor pumpkins even, but unusual things weren’t so unusual in Gravity Falls.

Soon as she’d figured out what it was the kids were all over it, both grabbing it from either side, trying to pull it away from the other. “Give it to me!” Dipper commanded through gritted teeth.

“I’m the oldest so I say I get to keep it. That’s the rules and...” Mabel barked back.

Dipper growled, “Knock it off with the ‘Oh look at me, I’m five minutes older so I’m so special’ thing, Ma...”

But Mabel was still talking over him, “...it’s about time you accepted it, Dip...”

Wendy plucked the heavy pumpkin from their hands by its stem. Skinny as she was, Wendy was Manly Dan’s daughter after all, and she had the strength to prove it. The twins gawked up at her, speechless as she dropped it in her free hand and then carefully looked it over. As she turned it she saw that it had been carved already, with a fancy and quite scary take on the standard Jack-O-Lantern face. And, more impressively, it was lit from inside even though the top was still attached. She held it to her face and turned it in her hands, trying to figure out how they got such a bright light inside.

“So, like, did you two do some Egyptian thing to get the guts out through the nose and stick the candles in with wires or something?” she asked, truly impressed. It was so cool that she forgot all about their arguing and just enjoyed the feel of it in her hands, the mesmerizing flicker of its wicked awesome smile. She was finding it hard to stop staring. She bit her lower lip for a moment. Then without looking away she told the twins, “If you two are going to act like little babies about it then maybe I’ll just keep it myself,” she said only half joking. Or maybe not, because the more she looked at it the more she really did want it for herself. It wasn’t just cool but it was really cool, and she started to understand why they were arguing so bitterly. However she didn’t bother to wonder why it was affecting them so much.

“Yeah, since you two can’t be mature enough to share,” As she stepped back behind the counter she added, “It's better if I keep it so you won't fight over it.”

“Wait a minute,” Dipper exclaimed as he and Mabel both reached for it. But she raised it up just out of their reach.

So they grabbed onto her instead. Mabel whined, “Wendy! That is so unfair!” The two tried to stop her, with Dipper attempting to block her while Mabel grabbed her shirt so hard it came partially untucked.

“Dipper! Mabel!” she shouted when she realized how roughly and inappropriately they were grabbing her. “Cut it… OUCH!” she suddenly felt the pumpkin grow very hot in her hands and saw the face brighten significantly. “Damnit!” she muttered. She thought maybe it was lit by an oil lamp and she’d just spilled a bunch of hot oil in it. Wendy quickly put it on the counter and the face dimmed back to normal as soon as she let go. She leaned down and tried to look through the mouth hole but then realized that the twins were still clinging to her. “Cut it out!” she hissed at them, but they wouldn't stop.

However they weren’t going for the pumpkin – they were going for her, slowly pawing her the way boys tried to… and then Wendy realized Mabel had finished pulling her flannel shirt out of her pants!

“Whoa, what’s going on!” her voice boomed in surprise. Then she saw a strange and even terrifying look in their faces, big glassy smiles as they adored her, worshipped her with their eyes and ever more so with their hands. “What are you two dorks doing!” she demanded.

“Like you said,” Dipper replied in a slow, dreamy voice, “We’re trying to be more mature.”

“Yeah,” Mabel added as she yanked hard on one of Wendy’s belt loops, getting her attention, “So we’re not fighting anymore because you’re so much, much more important to us, so now...”

Then Mabel and Dipper said together, “… we’re more than happy to share.” They briefly glanced at each other, a little in surprise, and both giggled.

Dipper suddenly hugged Wendy around the waist, resting his face against her stomach. He sighed. Meanwhile Mabel pulled herself up onto the counter. After thoughtlessly pushing away the black pumpkin they’d been fighting over it glowed fiercely at her. “Don’t give me that, Mr. Glowy Face,” she tried to scold through her giggles. Then Mabel pulled Wendy’s hat off and put it on the nonplussed gourd. “Here, this will keep you nice and warm while we play with Wendy.”

The tall redhead was still trying to peel Dipper off of her front when Mabel’s comment finally registered. Before she could react Mabel was running her little fingers through Wendy’s long, red mane, carefully petting her head with her fingers as if easing any snags out of her hair. But quickly the little girl started to pull on it, just a little bit harder.

Wendy reached up to stop her, but Dipper suddenly slipped his hands into hers, instantly lacing their fingers perfectly. He started rubbing the sides of his face against her belly. He let his arms go somewhat limp, so it was hard to find a way to free her hands without doing something that would hurt him. As she tried to shake him off Mabel chimed, “Wendy, catch!”

Wendy turned her head back just in time to see Mabel in a diving pose at the edge of the counter. She fell forward, making Wendy gasp and lurch back to stop her, but that was exactly what Mabel wanted. The little girl pounced on Wendy’s back and wrapped her arms around to the front of Wendy’s shoulders, pulling Wendy’s upper body back as Mabel’s feet returned to the edge of the counter. Now the teen couldn’t move forward, and Dipper was still somehow managing to keep her from using her hands at all.

And that was perfect as far as Mabel was concerned. It made it so much easier to start unbuttoning the teen’s flannel shirt. The redhead gasped in utter disbelief. After undoing the first few top buttons Mabel had to stand on tippy-toes to reach over. Then she nearly climbed over the teen’s shoulder to reach more. Wendy shook her hands furiously but Dipper’s seemingly gentle hold still wouldn't give, and the twins' combined actions made the redhead lose her balance. Wendy thrust her elbows behind her back onto the counter just in time to keep from falling down hard onto her bottom. By then Mabel had gotten all but the lowest buttons and she had to yank up the front of Wendy's shirt to get them. Her undershirt got pulled up with it, leaving the unshakable little boy’s face against her bare tummy. The moment he felt her warm, naked skin he started kissing her tummy and around the bottom of her ribcage, exaggerated with Wendy’s back arched in that awkward pose.

“Cut it out, you two retards,” she snapped so loud she even scared herself, but the kids didn’t seem to notice. She resisted with all her strength yet Dipper easily moved his hands around her waist, trapping her hands behind her ass. Mabel pulled Wendy’s tee shirt over her head and yanked that and her shirt down to her elbows, trapping her arms. Now the teenager was stuck with her back arched painfully and only her small bra covering her upper body. Dipper found her outie belly button and started kissing and licking it in earnest, giving Wendy a series of uncomfortable shocks. Each time his tongue pressed in hard and swished it felt like her insides wanted to clench but couldn’t. It hit her hardest in her nether regions, though it wasn’t arousing and the pangs disappeared in an instant. Still, Wendy was surprised at how very weird it felt. She let out some uncomfortable grunts and occasionally shuddered from the uncomfortable tingles.

Mabel wrapped an arm over the redhead’s neck and held on loosely. Wendy thought she felt Mabel's fingers dart into the top of her bra cups for an instant. Mabel scrunched up her eyes and shook her head, using her face to push the long red hair from Wendy’s neck before kissing it. Slow, lingering kisses at first, but soon she started to suck and bite a little too. Mabel bent her knees and slid her upper body off the teen, clumsily caressing Wendy’s upper chest and neck as she did. Finally she knelt forward on the counter, one knee on Wendy’s bunched up shirt to hold her in place, and pulled Wendy’s hair over to one side. Then she and Dipper gave her very hard play bites at the exact same time. Wendy squeaked and bucked in surprise, even a little pain. The twins giggled and then resumed kissing and licking her, tasting her all up and down. Mabel suckled her way up to Wendy’s ear and took it into her hot, very wet mouth; Dipper kissed up her tummy, stepping up on his toes to reach her breastbone. It was kind of a relief, but despite herself Wendy was feeling flush and perspiring more as the kids’ clumsy attentions started to arouse her.

Dipper deftly slipped his fingers from Wendy’s and began rubbing and squeezing her ass hard as he could. He was all over the place, feeling up to her waist sometimes and other times his greedy fingers tried to work themselves into the crease below her ass cheeks. Meanwhile he resumed kissing her belly even harder and was trying to work his tongue, if not his entire face, down the front of the redhead’s pants.

“Enough!” Wendy exhaled, a failed shout, as she tried to grab him, but Mabel had her arms trapped good. Then she felt something else and looked back to see that Mabel had threaded the "Perfectly Preserved Mystical Madeinchina Mummified Snake" between her elbows. As Wendy turned back Mabel was able to pull the teen’s elbows together enough to tie the rubber snake tight. True panic set in. “Let me go NOW!” Wendy cried.

They didn’t notice. “Hey Dipper, watch what I can do!” Mabel chimed before pushing her face into Wendy’s back. She licked and scraped her teeth into the redhead’s skin, making her squirm and squeal and even grunt as the girl's braces occasionally scratched her. “Catch!” Mabel cried out an instant after she'd unclasped Wendy’s bra with her teeth.

Dipper threw his head back and caught it in his mouth. Wendy looked down at him in shock. He smiled up at her, his eyes widening for a moment as he returned her look. But then she realized his gaze was actually fixed on her very firm breasts. They were about orange sized, just big enough to crease if she were standing up straight, but with her back arched they protruded proudly, and her already hardening nipples went fully erect as the cold air hit them.

He snapped his head aside and practically spat the bra into the wastebasket before looking back up at her with a dreamy face. Then he drew his hands roughly up the sides of her chest while standing on tippy toes to get a better view. “No Dipper,” Mabel complained, “Now you have to do it too.”

He wasn’t the least bit upset at her order. He instantly dropped back onto his feet, returning his mouth to the front of her corduroys. This time though he started mouthing and biting around the top button. He slid his fingertips into the front of her pants to hold them steady. He struggled and growled and bit at the buttonhole side until he managed to pull it free. Wendy was too flabbergasted to speak as his teeth gingerly tugged her zipper several times until it was mostly down. Wendy could feel his hot breath and his face brushing against her sex through her plain white panties.

Then he made haste in pulling her pants down past her knees. Wendy wanted to spread her legs to stop him, but she was afraid of what would happen if she exposed herself like that with his face right there. He and Mabel were really scaring her enough already.

Dipper glanced up and traded a knowing glance with Mabel, who immediately jumped off the counter and grabbed one of Wendy’s elbows; an instant later Dipper stepped away from Wendy’s legs and grabbed her other. The two yanked her flannel and tee shirts off her arms, making her elbows slip off the edge of the counter. Wendy’s feet slid forward. “Guys! I’m falling!” she cried out, but the twins had just enough strength between them to let her bottom hit the floor with only a soft impact.

Before the redhead could recover both twins were each gripping one of her ankles in both hands. They pulled with all their might, dragging Wendy forward half a foot and almost making her head fall back onto the floor. As she struggled to sit up they did it again, and on the third tug again she laid back on the ground rather than risk hitting her head. They stopped when she was about four feet from the short edge of the counter and then traded satisfied smiles. Then they eagerly untied her boots. Dipper pulled so hard on one that he fell on his butt as it came free. Mabel giggled, and so did Dipper as he got up and helped her with the other boot. Then they turned back to Wendy with big, satisfied, yet still glassy-eyed smiles. A bit of drool escaped Mabel’s lips, sending a cold shiver up Wendy’s spine.

She started to struggle and kick at the twins, twisting her legs wildly in a vain attempt to keep them from taking her pants completely off, even though she was just about fully exposed already. Despite her kicking and wriggling the children freed one of her legs. Wendy knew she could probably stop them if she used all her strength, except she could never bring herself to actually hurt them. No matter what. Soon enough Mabel wrestled Wendy’s free leg to the ground and sat on it while Dipper pulled Wendy’s pants completely off. Though Mabel’s skirt covered it, Wendy could feel Mabel’s hot sex pressing into her shin, and while Dipper grabbed Wendy’s free ankle his sister began to grind herself on Wendy’s lower leg. Mabel let her head fall back and closed her eyes while letting out a dreamy moan.

Still grinding, Mabel worked her way up to sit on Wendy’s thigh, and Dipper sat on her other. Then in perfect sync the twins fell forward and wrapped their mouths around her nipples. Mabel sucked hard on one teat while roughly massaging the mound with one hand, and with her other she roughly pawed at and even pulled hard at Wendy’s long red hair again. The little girl wrapped her legs around Wendy’s thigh and humped herself against it even harder, her panties now soaked through.

Meanwhile Dipper made a point to kiss and lick all around Wendy's firm little tit, furiously sucking and sometimes scraping it with his teeth. At the same time he rubbed up and down her belly with one hand, drifting ever closer to her mons and her panties, yet with his other hand he caressed her face, her cheek, her ear, very tenderly. It wasn’t long before he slipped his fingers into the top of her panties and started fingering just above her vulva, ever bolder in his exploration. Mabel suddenly yanked Wendy’s hair extra hard, distracting her while the youngster grabbed Wendy’s panties too and both twins quickly pulled them down to her mid-thighs.

Wendy wriggled and bucked to get the twins off of her, but it was no use. Now both of them were feeling up her sex, massaging her mound firmly and making her whole body heat up. Soon they were dipping their fingers between her pussy lips, both giggling as they reveled in the feeling of her moisture. Occasionally they seemed to relent a bit, but when Wendy looked up she saw that they were also caressing each other’s hands off and on too. It made another strange feeling spring up inside of her.

It was all way too weird, but she had almost no leverage, and as the two children attended to her with such fervor she found her resolve to stop them slipping away as well. When the twins suddenly let go and stood up she didn’t even move, half afraid of what they were going to do to her and half afraid that they weren’t going to do it.

“Shall we?” Dipper asked his sister. She nodded and the two unceremoniously pulled Wendy’s panties off in one quick motion, leaving her in nothing but her thick cotton socks. The teenager let out a cry and pulled her legs together in a vain attempt to keep them from seeing her vulva, but they had a perfect view of her labia and mons despite the wisps of red pubes not quite covering her genitals.

“Aww, don’t worry,” Mabel responded to Wendy for the first time, “We’re going to get naked too.”

“It’s only fair,” Dipper added breathily while staring up and down Wendy’s fully exposed and helpless body. Then he turned to his sister and dropped to his knees. He looked up at her with a big smile as he slid his hands up under her skirt. Mabel gave Wendy a quick sideways glance, making sure the teen was watching, and then gave a subtle nod. As Dipper slowly pulled down his sister’s panties she leaned forward and started kissing him hard on the lips. She put her hands on the back of his head and pulled him into it even harder, knocking off his cap. He responded by kissing her back deeply, lovingly. But every few seconds one of them would turn their eyes towards Wendy’s face, trying hard not to giggle upon seeing her eyes so wide, her mouth agape, and her pussy getting wetter by the moment. Wendy was too surprised by her own reaction to their sexual play to realize they were doing it just for her. Mostly.

Dipper helped Mabel step out of her panties, then she pushed off her shoes with her toes while Dipper reached around her waist and undid her skirt. It fell to the floor, leaving Mabel only in her long sweater which instantly fell almost down to the bottom of her butt cheeks. The sudden disappointment in Wendy’s face made Mabel laugh so hard she had to cup her hands over her mouth. She gave the teenager a look of pity. “Aww, is there something you wanted to see?”

Wendy quickly shook her head and then turned to face the side. “That’s too bad because we’d be happy to show you more.”

“Anything you want,” Dipper added. “Anything.” Wendy's body started to tingle all over and her breathing quickened.

Mabel giggled at her captive but then suddenly let out a gasp, making Wendy peek. Dipper was still on his knees and had lifted Mabel’s sweater just enough to press his mouth against her sex and fellate her. Mabel moaned over the wet smacking sounds as he licked and kissed his sister’s cunny. Then she noticed that Wendy was stealing glances so she held Dipper’s head back for a second. “I think she really wants to watch, Dipper,” she cooed, “so let's give her a better view.” Mabel slowly turned, waiting for Dipper to catch up, until Wendy could see them from their sides. Mabel smiled at Wendy, who now couldn’t help but stare. “This is all for you,” Mabel said before blowing Wendy a kiss, making the teen swoon a little.

Dipper pushed Mabel’s sweater up to just below her breasts as he continued licking and kissing her sex, and then he nuzzled and sucked his way up to her stomach, giving her belly button the same treatment he’d given Wendy. Mabel gasped and grabbed the sweater from his hands, quickly pulling it off and flinging it onto the floor. Wendy could only stare in awe at the very pretty, naked little girl. The redhead looked up and down the slightly chubby girl’s short form, drinking in the sight of her jiggly thighs, soft rounded bum, her chubby and completely hairless cunny, and the fleshy baby fat breasts where real ones would eventually be. Along with her face, Mabel’s whole body was more than a little flush.

She stopped rubbing the back of her brother’s head and helped him stand up before taking hold of his shoulders. Again, the sister and brother kissed each other deeply. Without breaking their lip-lock Mabel backed away just enough to start unbuttoning Dipper’s shirt, making both of them lean their faces in together. In returned he reached his hand that Wendy could see behind his sister and started squeezing and massaging Mabel's bum. His other hand cupped the side of Mabel’s face as she finished his shirt and started undoing his pants.

Mabel unceremoniously pushed him back and pulled up on his shirt. It took Dipper a few seconds to get it the rest of the way off by himself. Meanwhile Mabel knelt down in front of him and started to pull down his pants. She suddenly stopped and gave Wendy another glance, seeing that the panting teen was staring intently and was now rubbing her thighs together rhythmically. Dipper turned to see too and was enraptured by the sight. Mabel turned herself so that her bottom was facing Wendy as she knelt down again to pull her brother’s pants off. The brunette spread her feet apart and wiggled her ass, with a view of her spread her pussy lips, at the teen.

Wendy whimpered despite herself and dropped her head back. But only for a moment. When she looked again Dipper was pushing off his pants and shoes with his feet while Mabel gawked at and gently rubbed the large bulge in his underpants. Then the little girl suddenly yanked down her brother’s tighty-whities, snapping his cock painfully.

“Ouch!” he shouted while pulling his hips away. Despite the craziness of what was happening Wendy couldn’t stop herself from laughing. Amateur, she thought for a moment, but then she was stunned by her “normal” reaction in such a bizarre predicament.

Mabel glanced at Wendy with that playful yet glassy-eyed smile again. “If you knew that was gonna happen you should have told me, silly,” she tittered. Then she turned her attention back to her brother’s cock and stared for a moment before licking some more drool from her lips. “Yeah Dipper, you weren’t lying. It’s perfect.” She leaned forward as she pushed down his underpants, and just as her hands met the floor Mabel leaned in and grazed her lips over the tip of her brother’s erection several times, also letting it rub against her cheeks. Yet all Dipper could do was smile down at Wendy, whose eyes were fixed on their show as she wriggled her thighs enough to rub her dripping pussy lips together.

Mabel then snapped out of her revelry and leaned back onto her feet, still staring at her brother’s beautiful penis. “Not today,” she sighed. “After all, this is all for Wendy, right?”

“Right,” Dipper answered. The two naked children then knelt down on either side of the breathless teenager, both holding themselves over her the best they could. First Dipper started kissing Wendy fully on the lips, and the redhead found she couldn’t help but kiss back and even accept his inexperienced but eager tongue into her mouth. Then he pulled back and let Mabel take a turn. She was more excitable and could barely control her nervous giggling until Dipper rejoined them, making it an awkward but still enjoyable three-way kiss.

They went on like that for a few minutes. Mabel put a hand under Wendy’s head as she started to get the hang of adult kissing, and then after Dipper eased himself out of the kiss she put her other hand on the side of the teen's face. Mabel lifted her leg up over Wendy’s and hooked her heel behind Wendy’s knee, and then the brunette started slowly rubbing her hot, slick pussy against the teen’s waist.

Dipper took a good minute to suck and fondle Wendy’s breasts some more, drawing gasps and sighs from the teenager. Every little noise from the girls turned him on so much more that he also began to feel up and squeeze his sister’s breasts too. At first her eyes went wide in surprise, but she kept making out with the now very willing teen but couldn’t stop herself from letting out even heavier moans and sharp squeals at her brother’s attentions. Now the girls’ sounds of ecstasy made Dipper even crazier with lust.

Soon the boy couldn’t help but bring his face down to Wendy’s pussy, and he started off by kissing and licking the top of her slit, like he’d done with his sister. However Wendy almost immediately spread her thighs, revealing her swollen, dripping sex fully. The teenager let out a few pained moans as she raised and lowered her pelvis at his face. Though the redhead was angry and scared she was too turned on to resist. She knew that nothing was going to stop Dipper and Mabel from pleasuring her the best they could, once they figured out how. But as Wendy got into it and was now downright eager for his attentions Dipper got a funny thought. He was always waiting hard for her to see if she liked him in that way or what she really wanted from him. But now that it was totally obvious he realized that all the time he waited, thought about what it’d be like, the anticipation, only made this so much better.

So it was only fair to do the same for her.

Again, he kissed her on her pussy lips, mouthing the top of her slit and trying not to poke his tongue out, no matter how bad he wanted to. He reached two fingers up between her legs and started swirling them around her inner thighs and grazing her outer lips. Slowly. Wendy yanked her head away from Mabel’s ever more forceful kissing and cried out, “Dipper, please!” before the little girl started wrestling the teen’s head back down for another round of breathless face sucking.

However Dipper looked up at the girls and smirked, calmly saying, “Mabel, let’s let Wendy have a little air.”

Without hesitation Mabel pulled away and smiled at him. Wendy struggled to lift her head until Mabel helped her lift it to see. Smiling evilly, Dipper gave her a piercing stare as he pushed his fingers just barely inside of Wendy’s hot, juicy snatch, and then he suddenly flicked his hand up, making the redhead buck and gasp in shocked pleasure. He waited until she opened her eyes and looked at him again, then he deliberately raised his drenched fingers to his face, sniffed, smiled, and then slowly pressed them into his loosely closed lips. Wendy’s breathing became fast and shallow, and even Mabel was so awed that she stopped grinding.

At the last second Dipper opened his mouth and plunged his fingers the rest of the way in before sloppily licking and noisily slurping her juices from his digits. Wendy’s eyes half-lidded and she let out a slow high-pitched moan. Mabel felt a little lightheaded and all but fell on Wendy, and then she started feeling and sucking and biting all over Wendy’s shoulder and neck, drooling unashamedly all over the teen. She gripped one of Wendy’s breasts in her hand and started squeezing roughly and occasionally digging her fingers in. The little brunette spread her legs over Wendy’s waist and ever so slowly began rubbing her dripping, immature sex over the bump of Wendy’s pelvic bone.

“Oh, Mabel,” Wendy groaned between pained gasps, “So good. But Dipper...” Her pitch got higher and she trembled a little as she continued, “Please... Please don’t stop!” she whined. Much as he wanted to make her feel really extra-special good by teasing her, he knew that making her beg would break his heart. He returned his face to her pussy and started frenching it in earnest, taking as much of it as he could into his mouth and swishing his tongue all around and between her lips. Without thinking he pressed his fingers back into her pussy and pumped them slowly, swirling his fingertips inside of her. The teenager’s squeaks and anxious moans made his heart speed up and all the blood rush to his head, or at least all the blood that wasn’t already in his other head, and he found himself kissing and sucking and fingering her harder. He wished he could do it forever.

“Dipper!” Mabel stuttered, sounding almost teary. While still eating Wendy out he tilted his head to see Mabel slide down and lift her leg over Wendy, laying herself on top of the teen. With her free hand she grabbed one of her own ass cheeks and pulled it hard, revealing fully her most intimate places, glistening and almost dripping with her nectar. “Me too,” she begged.

Dipper moved Wendy’s knee to the floor and rested his head on her inner thigh as he continued to lick and suck and drive his tongue into the redhead’s cunny, all while still fingering her deeply. Then he used his free hand to reach between his sister’s parted bum cheeks and stroked her taint and over her chubby slit. “Oh Dipper!” She cried out immediately, making him stop for a moment. But he quickly resumed his attentions on the older girl, pumping and twirling his fingers inside of her while kissing her slit up and down in earnest. His head was swimming and he was starting to tremble from all the intense activity, but he again tried best he could to gently stroke his fingers up and down between his whimpering sister’s crack. Soon he found a gentle rhythm and her near sobs turned to delighted little gasps, and then she was contentedly, if sloppily, sucking and fondling Wendy’s breasts again.

Wendy was a little disappointed that Mabel now blocked her view of Dipper, in case he wanted to tantalize her again, which she now realized she wanted even more. The strange thought crossed her mind that Dipper was teasing her by not teasing her, but thoughts like that didn't last long in her hazy, lust-addled mind. Still, the sight of Mabel laying on top of her chest, nursing and groping her just seemed so sweet. Though she could feel Mabel wriggling her bottom and trembling with her butt raised, and after Mabel’s plaintive cries to her brother and knowing that both of Mabel’s hands were occupied made it obvious that her brother, even when making love to the girl he’d been totally crushing on, would go out of his way to make his sister happy too. Not only was it sweet, but the renewed thought of twincest suddenly turned Wendy on even more.

As Dipper worked he found one fleshy nub inside Wendy’s slit that, the first time he ran his tongue over it, felt very hot. He tried again but the heat was gone, however he realized that licking and kissing that place made Wendy squeak and sometimes her whole body would quiver. Fortunately whenever one of her knees jolted up from the shock it merely pressed his face harder into her sex for a moment, and within a few seconds her leg would wobble uncontrollably until Wendy could let it drop to the floor again.

Wendy was nearing the brink. The blood rushed in her ears and every flick of Dipper’s tongue, every pulse of his fingers sent stronger and stronger surges of pleasure and frustration throughout her body. But even as her climax neared she still wanted more… Something that would make it not just powerful, but epic. Just then Mabel threw her head back and choked out, “Oh Dipper, I love you so much! Please don’t ever stop. Make Wendy and me come together, HARD!”

Wendy had tried to deny it all along, even as her resolve failed, but that cinched it. She realized that not only did she love that Dipper and Mabel were so close, but she had secretly wanted to see them even closer, and in the worst way. “Guys, wait!” she gasped even as the twin pleasures brought her nearly to the breaking point. Like earlier, they were too engrossed doing her in their own ways to listen – until she added, “I know how to make it like a million times better!”

That got their attention. Wendy saw Mabel lift her panting face and stare at her through half-closed eyes, and an instant later Dipper’s flushed face, dripping chin and all, excitedly popped up over hers. “Mabel, turn around,” Wendy ordered in her raspy voice while barely noticing how easily she snapped the rubber snakes binding her elbows. She sat up and pushed Mabel’s shoulders away but also grabbed the butt cheek Mabel was holding to pull her bottom closer. The small brunette had trouble understanding through the lusty haze and near exhaustion, but Wendy grabbed Mabel’s hips and pulled the little girl’s legs up above her head, placing Mabel’s very sensitive pussy just above Wendy’s mouth. But Mabel’s face couldn’t reach Wendy’s groin. The little girl simply rested her face on Wendy’s belly and started to sob.

“Did I do it all wrong?” she asked her brother with pleading, watery eyes. Even with one hand half buried in Wendy’s pussy, Dipper brushed her hair from her face reassuringly and wiped away one or two stray teardrops.

“No, you’re doing good,” Wendy cut in before giving the girl a single loud spank. Mabel yelped but then was smiling again. “But let’s try it a little different. Dipper, get up here,” the redhead ordered while wriggling a finger in between Mabel’s pussy lips.

“But, what about...?”

Wendy couldn’t hide her giddiness as her plan came together. “Trust me, Dipping Sauce, this is going to be the best!” With that she pressed a finger all the way inside his little sister, making her suck in a loud breath. Mabel’s noises suddenly made Dipper painfully aroused, and it alone nearly pushed Wendy over the edge before she was ready.

The boy hurriedly got up and then knelt next to her head. Without warning Wendy craned her neck and took about half his erect cock into her mouth, then went up and down on it a few times. It was rock solid even though Dipper’s knees had turned to jelly. But before he could fall she made him get on his knees right behind his sister.

“Okay Dipper, I want you to do just like before but have Mabel help you, okay?” Wendy panted, now so close to making it perfect.

Dipper looked down at her, past his throbbing cock, confused and even disappointed. “So just our hands? You’re too tall for us...”

Wendy smirked at him while raising her long legs straight into the air and barely hooking her heels against the counter and the windowsill. It raised her pelvis more than enough to give the children easy access to her slender lips. Mabel found Wendy’s hot pussy in her face. Dipper gasped in amazement at her flexibility, not to mention the fully spread view of her sex directly under the light.

“Hurry!” the teenager urged, and Dipper was more than happy to comply. He leaned forward and put a hand over his sister’s, guiding it into Wendy’s greedy snatch. Then the two leaned in and started kissing and licking the teen again, and without realizing it they each put a hand on each other’s lower back. Wendy was caught up in how adorable that was, until Dipper and Mabel really started going at it, thrusting their little fingers in and out of her vagina while greedily licking and sucking all around her snatch. Dipper didn’t have to explain anything because Wendy had started pumping her fingers in and out of the little girl, in the same way Dipper had been doing to her, and Mabel followed the older girl's lead. Wendy couldn’t help but also kiss and lap up the juices from Mabel’s smooth, flawless pussy.

Between Mabel’s gasps, moans and ministrations, the kids occasionally licked Wendy’s excess juices off each other’s faces and traded short passionate kisses. Soon their tongues were playfully fighting for control over that little button Dipper had found earlier, and they giggled almost constantly as they continued to pleasure Wendy.

But the teenager still wanted one more thing to make it perfect. While the kids were busy she wrapped her thumb and forefinger around the base of Dipper's cock and guided his pelvis forward. Without missing a beat he walked on his knees until the redhead lined his tool up with Mabel’s dripping hole. Wendy pulled her wet hand away and quickly licked her fingers clean, which made Mabel lower and wiggle her hips, desperate for Wendy to resume licking her pussy. But the redhead had something much better for her. With her sticky hand she grabbed the top of Mabel’s inner thigh and pulled her back; meanwhile she pulled Dipper’s dipper forward and pressed its tip inside of his sister. Quickly she let go of the base and stuck her hand up between his legs, shoving his ass forward with her palm. In a second she’d forced them to couple, with Dipper’s cock nearly buried in Mabel’s love channel.

Both twins froze as Dipper’s pelvis slapped Mabel’s bottom. “I didn’t tell you to stop,” Wendy grunted, “and move it, Dipper!” she added while smacking him on the ass hard enough to make both him and Mabel wince. Then Wendy half clenched Dipper’s sack in her hand and motioned him to move back and forth as she kept a tight grip on Mabel’s upper leg. The boy didn’t dare disobey now. He started sliding back and forth into his sister. It took half a minute for them to get used to the feeling of actual sex. Mabel felt fully stretched at first, but as her brother moved in and out of her it got easier to bear, and Dipper was having trouble concentrating as his sister’s hot, slippery insides gripped his shaft so tightly. For just a moment the twins stared into each other’s eyes, a little confused and a little scared, but then they smiled. It was with someone they loved, and it was all right. Yet the whole time they didn’t, or couldn't, stop fingering and licking and sucking on Wendy’s steamy pussy.

And it didn’t take long until Dipper was pumping into Mabel on his own, and she happily pushed back against her brother’s thrusts. Though Wendy was already trembling and panting, electricity filling her body as she neared climax, the very close-up view of the twins fucking over her face made their “sexual assault” ten times better. Then the redhead went for one hundred by pushing herself up on one elbow and fondling Dipper’s ass with her opposite hand. Then she pressed her mouth against Mabel’s slit, first sucking around Mabel’s clit and then attacking it directly with her tongue for several seconds, and then she switched to suck on Dipper’s scrotum and balls, moving her head back and forth as he fucked his sister.

Dipper bit his lower lip and sped up his motions, now rubbing his face between Mabel’s flushed cheeks and Wendy’s pussy. Mabel gladly licked her brother’s face when it got in the way of Wendy's snatch, and she was soon panting and squirming herself. Wendy continued to alternate sucking at their sensitive parts as the children fingered her much more furiously and erratically.

“I love you Dipper, but...” Mabel gasped

“I love you too, Mabel, but...” he groaned as if in pain.

Then together they finished with, “We have to stop and take care of Wendy!”

“What? No! Not now!” Wendy panted as Dipper stopped pumping and tried to pull out of his sister.

“But we have to make you happy,” Mabel complained.

Dipper followed, “That’s the only really important thing.”

“Why...?” Wendy stuttered, even though she was about ready to burst.

“Because we love you, Wendy. More than anything,” the two answered in unison.

Wendy was just about out of her mind. “But watching you fuck is making me happy oh god you have no idea how much I love seeing you two doing stuff to each other and I didn’t either until today and please whatever you do don’t stop because it’s gonna be so perfect if you just...”

Wendy’s words worked like magic. Dipper gripped Mabel hard around the waist with his free arm and started fucking her with all his might, kissing and biting the back of her neck and shoulders. Mabel reached behind his head and clutched a handful of his hair to help steady herself. Yet both of them still managed to keep the fingers of their other hands busy pumping in and out of Wendy, and Mabel’s mouth attacked the teen’s pussy with more than enough vigor for the both of them.

Wendy let out a shriek of pleasure and buried her face in Mabel’s mons, struggling to suck and lick the little girl back with the same animalistic hunger while Dipper’s scrotum slapped into her cheek at an ever quickening pace – barely hard enough to make her wince but still very arousing.

Dipper let out a strangled grunt and forced himself deep into his sister, holding still for several seconds and then jerking his hips erratically for several more. His cock pulsed painfully hard, spurting more cum into his sister than he’d ever coaxed out on his own. Mabel gasped as the first hot blasts of his spunk shot deep inside her. The boy’s breathing was hard and he could barely move except to kiss the back of Mabel’s head while the warm rush overtook his body, leaving him in a groggy, half-dreaming state. Still, he let go of her and turned her face towards his, but at the first taste of Dipper’s spunk Wendy was suddenly like a woman possessed, driving her mouth onto Mabel’s young pussy harder than the teen thought possible. She also couldn’t stop herself from reaching down to grab and squeeze hard at the immature mounds of flesh on Mabel’s chest. The little girl’s back arched and she threw her head back, out of her brother’s reach. Desperate to kiss something Dipper returned his mouth to Wendy’s pussy, taking out all of his oral frustrations on it instead

Mabel and Dipper both started jerking their fingers wildly in and out of Wendy. It was hurting the teen but it also felt better than anything she’d ever known before. As more of Dipper’s cum and Mabel’s juices drizzled into Wendy’s mouth and onto her face she drove herself into Mabel so hard that Dipper could feel it in his tingling, spent cock too. He pulled his hand from Wendy’s snatch so he could grab tightly around the bucking teenager’s thigh and keep up his oral assault on her red hot pussy.

Mabel let out a blood-curdling shriek and her whole body flailed so hard that Dipper and Wendy had to grab her tightly again, but the sound of Mabel’s first orgasm tearing through her small body triggered Wendy’s long-awaited climax. Both girls screamed and groaned and gasped loudly, their bodies quivering as their inner muscles contracted painfully and then released over and over again. Yet the warmth flooding throughout their bodies kept it from hurting as it pushed every thought out of their minds. Their thrashing and squirming pulled Dipper’s softening cock from his sister’s cunt and a flood of their hot mixed fluids spilled out all over Wendy’s face, driving the redhead to an even higher level of ecstasy.

Even though Dipper’s head was spinning and his body was still weak from the mind-blowing afterglow of his intense orgasm, he managed to wrap his arms around his tensed-up sister, so lost in her own orgasm. He was even a little worried until she finally grunted and let out a huge breath. He stroked her hair and laid gentle kisses on her forehead as she slowly returned to reality. A very strange and twisted reality, but also a very warm and loving one. Finally she opened her eyes and, seeing him, smiled brightly.

After a brief kiss on the lips they were compelled to turn their attention to the teenage girl lying underneath them. The twins wearily raised themselves up off of Wendy, grunting and wincing a bit as the pain and discomfort from their awkward positions and vigorous activities caught up with them. They turned around and got on either side of Wendy. Her eyes were closed and she wore a big smile as she took long, deep breaths. She’d passed out. Even with cum and spume all over her face and chest, her hair matted and mussed, she was still the most beautiful girl they’d ever seen. After trying their best to kiss her awake, with several pauses to kiss each other deeply, intensely too, Mabel and Dipper simply curled up on either side of her, resting their heads on her shoulders. They put Wendy’s hands on her stomach and each placed a hand over the teen's.

“Dipper,” Mabel mewled. “We have to do this again.”

“Yes,” he answered intensely, “We really have to.”

Then they drifted off to sleep too.

It was dark by the time the door opened, but neither the little bell nor the sounds of Stan and Soos carrying in the "un-building" supplies was enough to wake the exhausted trio. Grunkle Stan's attention was captured by the strange object on the counter, so he went over to check it out. After pulling Wendy’s hat off it he turned it around and stared into its smug, flickering face. “Hey, what the heck is this thing?” the old man said while picking it up.

“Oh wow,” Soos said when he saw it. “That’s the best Summerween Jack-o-lantern I’ve ever seen,” the tubby handyman answered. “It’s even politically correct.”

“Man, this would have been great to put out on Summerween. But it’s over now so get rid of it.”

Soos tried to explain, “Actually today is the real Summerween. We only celebrated it early this year because the Northwests didn’t want it falling on the same night as Pacifica’s cotillion.”

“Doesn’t matter,” Stan said. “It’s already going bad anyway, but nice job on the face. Looks like...” Stan put it down before finishing, “Mabel’s work.”

“Whatever you say, boss,” Soos acknowledged as he scooped it up and carried it to the kitchen. “The kids are in for a real treat.”

“Where are those little fiends anyway,” Stan grumbled. “And that good for nothing Wendy? We’re supposed to be running a business here.”

“You know kids,” Soos called from the kitchen. Then there were several chopping sounds.

Wendy and Dipper’s eyes immediately popped open and they bolted upright. They stared wide-eyed at each other, each making the shhh sign. Then they waited, terrified.

“They’re probably getting into some sort of wacky trouble,” Soos called out from the kitchen, “but it always comes out okay in the end.”

“Speaking of which,” Stan said while grabbing a copy of Curmudgeon Weekly Magazine and heading to the back of the house, “I gotta use the john.”

Once Mabel and Dipper were sure that Soos was busy carving up the strange pumpkin and Stan was otherwise occupied, they started to gather all their clothes.

“Oh my gosh, what did we do?” Dipper fretted in a raspy whisper.

“I have no idea,” his sister answered with a big smile, “But I hope we do it again.”

“This isn’t funny, Mabel. I really don’t know what came over us?”

“Oh Dipper, you silly, don’t you remember? We were the ones who came over her,” Mabel chirped. “Got it all over her face and everything.”

“Seriously Mabel, what’s Wendy gonna think about what we did to her? What’s she gonna do?”

“I think you did pretty okay for your first time,” Wendy said with a yawn before sitting up. She put her arms around the two and quietly whispered, “And what I’m going to do is teach you how to do it a lot better.”

She gave them each a quick kiss on their foreheads. “But we’d better grab our clothes and sneak down to the pond. We can go skinny-dipping and clean up.”

Suddenly, to Dipper, having a three-way with the girl of his dreams and his twin sister didn’t seem like such a big deal anymore. Skinny-dipping with Wendy, however, is what would make everything all right.

Dipper lost his frown and hurriedly picked up the rest of their clothes. Then the tired trio slipped out of the Mystery Shack, looking forward to a refreshing swim. And whatever was going to happen after that.

The End
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Coming Between Twins