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Fistbump 2: Unspeakable (a Pinecest story)	By : Edward_or_Ford Category: +G through L > Gravity Falls Views: 21283 -:- Recommendations : 0 -:- Currently Reading : 0
Disclaimer: I do not own Gravity Falls or its characters. I will not earn any money from this story.

Chapter List
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After they fumbled their way back to Dipper’s bedroom between clumsy kisses and groping, Mabel pushed Dipper down to sit on the edge of his bed, then she made herself comfortable sideways on his lap. They were necking and fondling heavily when Mabel broke the kiss suddenly.
“Seriously, Dip!” she panted. “We’ve got to figure out what in Sweet Sally we’re going to do here ... because, you can’t end up inside me tonight!”
Dipper idly massaged one of Mabel’s breasts. “I know,” he replied. “I had a sixteen-point plan on how the condom rollout was going to go, but I never had any opportunity to plan for this,” he said with a straight face. Mabel regarded Dipper, trying to decide if he was attempting to be funny or not. She decided that it was a hugely dorky comment either way, so it didn’t really matter.
The truth was that although the twins had tried a few positions for performing intercourse while in Oregon, they actually had very little experience with other means of pleasing one another, beyond simply fingering each other. They were too young to have developed a liking for kinkier ways of sex. Using toys or other objects were out. They didn’t even know that anal sex was “a thing”, and both would have immediately been grossed out by the idea in any case.
They decided that taking turns with oral sex was their only option. Dipper had tried pleasuring Mabel orally a couple of times, and while she had more than enjoyed it enough, he had found that she had tendencies that could make it somewhat painful work for him. Mabel’s experience with fallatio was limited to two attempts, the last episode substantially less successful than the brief first time. Still, they were both game to try it again that evening.
Dipper slid Mabel off his lap and onto the bed. He gently guided her down onto her back, lightly kissing her neck along the way. He traced his fingers all over her body, paying close attention to those spots that he knew were Mabel’s joy buzzers.
Then he climbed over her, straddling her thighs as he continued his light massage. Mabel hummed happily while busying her hands on Dipper's chest, hips, and legs.
Slowly, Dipper lowered his head to Mabel’s chest. With agonizing deliberation, he ran his tongue up her breastbone between her small mounds, up to her throat. Then he swiftly latched onto the sensitive spot of her neck below her left ear with his mouth, while his fingers deftly found her nipples and lightly pinched them. The combined actions produced a sharp breath from Mabel, then a long moan as she reached for Dipper’s penis.
He quickly pushed his stomach down, blocking her access. He raised his face from her neck to look directly into her eyes. “Nuh uh!” Dipper lovingly said, their noses and foreheads resting together. “I’ll get my turn later. This is for you!” Then he mashed his lips onto hers as he gave her nipples a harder pinch and twist. Mabel squealed in pleasure and surprise into his mouth.
Emboldened, Dipper decided that he would get his sister off in a different way than he had tried before. He wanted to try bringing her to her climax as quickly as possible, then slowly work her way back to more after that. He wasted no more time. Breaking the kiss suddenly, he scrambled down her body, tracing his tongue to both of her breasts and her navel along the way. In seconds, his face had arrived at Mabel's shaved vulva. He planted kisses and small licks to the top of the slit, as his knees released their grip on her thighs and he eased her legs apart until she was spread wide open for him. Then without an instant's further hesitation, Dipper sucked her clitoris into his mouth, working it over firmly with the flat of his tongue, while sliding his left middle finger into and out of her vagina.
Seconds earlier, Mabel had been wondering why Dipper was in such a hurry. Now she didn't care, she just craned her neck back and closed her eyes. Her breathing quickened, and she produced a series of moans that was rapidly escalating in volume.
Dipper loved that they didn't have to be quiet. Hearing Mabel's sounds of arousal allowed him to know right away that he was doing something correctly. He redoubled his efforts with his mouth and gave her clitoris gentle nibbles, while adding his index finger to the sawing motion on the front wall of her tunnel.
"Oh my God you're so good at that!" Mabel cried out. Or at least she tried to, as she was only capable of uttering incoherent babble. Dipper's right hand slid up her stomach to find a nipple, and with a pinch she shuddered even harder. His ministrations were sending her over the edge faster than she had ever gone, her days of pent up sexual energy helping to push her along.
Barely a minute later, her orgasm erupted. She rode out the first few waves of what she knew would be a long tsunami of ecstasy. She would gladly drown in this ocean of pure pleasure. Time seemed to stand still. There was nothing left at all in the world except her love for Dipper, and the unbelievably intense feelings he was giving to her. Nothing at all ...
... except for the realization that Dipper's expert cunnilingus and fingering had stopped some seconds before. And that he was presently fighting to pull his head back from her thighs while prying desperately on her hands. Thighs that were squeezing Dipper's head securely to Mabel's genitals. Hands whose fingers were tightly wound into the hair on Dipper's head. With a startled yelp, Mabel relaxed her legs and released her grip on Dipper's head.
Dipper immediately fell backward, gasping wildly for breath while furiously massaging his scalp. He didn't know which sensation has been more uncomfortable, the suffocation or the hair pulling. She'd done both to him a couple of times before, but this had been all kinds of worse! Weirdly, he knew that this had also been a kind of compliment to his skills, but it was small comfort at that moment.
Mabel scrambled to where Dipper lay crumpled up at the foot of his bed. "I'm sorry! ... I'm so sorry!" she cried, still very much out of breath herself. She laid down and hugged his heaving body to her own. She kissed the top of his head around the movement of his hands, panting apologies. Moments later, the urgency had passed, though Dipper was still trying to catch his breath. Mabel kissed him tenderly on his temple. “You’ve been studying up … from the Internet … haven’t you … you big nerd!” she breathed raggedly into his ear. "Do you see ... what you do to me?"
Dipper turned and looked at Mabel's smiling face in astonishment. "... Seriously? ... You're saying ... that this ... was my fault?" He managed a smile with the last breath of the sentence.

A minute or so later, Dipper took Mabel’s head in her hands and kissed her warmly. “I pronounce myself fit to return to duty!” he declared proudly, and he started moving his hands down her body.
Mabel brought him up short, grabbing his wrists. She had already decided it was her turn to take control. “Oh, no! Doc Mabel’s in the house, and she says that a full examination is in order. Starting now!” She launched her hands to his sides, and set her fingertips and thumbs loose on Dipper's ribs and stomach, with flanking attacks on his armpits, inner thighs, calves, feet, and anywhere else she could reach to reduce him to a ticklish, quivering mush.
There was a method to Mabel’s madness. She wanted him defenseless so that she could get access to his penis. She hoped that Dipper wasn’t apprehensive, as she had accidentally scraped her front teeth along the length of his shaft the last time she’d tried this last week. That didn’t do much for the mood. She vowed to be more careful tonight.
In the back of her mind, she was also curious. Mabel was really liking the idea of taking Dipper’s semen in her mouth for the first time. She had a long history of tasting and eating practically any edible (and sometimes inedible) things she laid eyes on. This one was new, and bound to be pretty different! She knew blow jobs were something lots of girls did, surely it couldn’t be that bad!
Dipper tried to wrestle back, but he was no match. Laughing and shaking pitifully, he shrunk down to the bed and wrapped his arms around his lower torso, attempting protect his sides and stomach from Mabel’s assault. She pinned his body down under her chest, and pushed his legs apart with her hands, leaving her target directly in front of her face. She grinned in anticipation: he must have liked the tickle warfare, because Dipper was hard again.
She carefully wrapped her mouth around the head of the penis, swirling her tongue around it. Then she opened her jaw wide and slowly lowered her head down, reaching most of the way to the base before the tip of his four-and-a-half inches reached the back of her mouth. Then she pulled back, creating suction, using the saliva on her tongue and lips to glide fluidly over the smooth skin.
Dipper had barely processed where Mabel was headed when her wet warmth surrounded the tip. His body continued to shudder, transitioning from laughter to arousal as his sister seemed to swallow him whole. Seeing her thigh beside his face as she crouched over him, he managed to pull the leg up over his head, reached up to grab the cheeks of her butt, and pulled her sex down to his mouth. Mabel moaned loudly as his tongue found her clitoris again.
The sixty-nine position can be a bit “busy”, and the twins were finding this out. Receiving and giving oral pleasure can be hard to do at the same time for the inexperienced. Mabel would stimulate Dipper in a particular way, and he would pause to tense and moan. Then he would focus, and a special lick or nibble would cause sparks to start flying behind Mabel’s eyes, and her attention to Dipper’s genitals would stop.
No, Mabel decided enough was enough, she would not be distracted. Dipper had already brought her to a tremendous orgasm, and she would concentrate on him no matter what wonderful thing he would do to her. She pulled off with a mighty vacuumed smack, then started pistoning her head up and down on his penis. There was enough spit on it already that she didn’t have to think about producing more. She moved as quickly as she could, keeping up the lip and tongue pressure. All the while, she was lightly tickling his scrotum with her fingertips.
Dipper tried in vain to remember what he should be doing for Mabel, but his brain was on overload. He was massively turned on by the fact that Mabel was sucking him off, and that she seemed determined to see it through to the end. They hadn’t talked about it, but Dipper really wanted Mabel to swallow his sperm. Getting a blow job had been his earliest fantasy since he started being interested in sex.
But one not-so-small thing was working against Dipper: he had already come, barely twenty minutes before. Though the rest of his body was incredibly willing, his testicles simply didn’t have all that much to give. Mabel was making him very horny, but to force a second orgasm this quickly, much more physical effort would be needed on his part. His hips had been moving rhythmically up and down with Mabel’s head motions. Now his thrusting became more urgent, more pronounced. His grip on Mabel’s butt tightened, and his entire body rocked in tandem with his hips.
Although her jaw and lips were getting sore and her neck was tiring, Mabel kept up with Dipper’s rhythm. Pretty soon, now, she thought in anticipation. This is going to be so cool!
Dipper was getting close, he could feel it, but at the same time he could also feel that he might not quite get over the top. Just a little more stimulation, he thought to himself, and I can get there!
With a quick motion of his legs and arms, he pushed and rolled himself and Mabel over, so that he was now on top, his penis still securely in Mabel’s mouth. Then his hips took over and he pumped vigorously. Several moments later, he felt an intense tightening. Yes, there it is! Dipper’s thoughts screamed in his mind. Finally, with one last, tremendously tense thrust, he yelled out in exquisitely beautiful pain, as small quantities of semen jettisoned forcefully from the end of his penis into Mabel’s throat.
Dipper slowly recovered, kissing her inner thighs and giving her clitoris a few loving strokes with his tongue. He mumbled his love for her over and over, and between these proclamations he praised what she had done for him and how that was one of the sexiest things that he could imagine them doing together. His penis had softened, but he could still feel that Mabel had it in her mouth.
He then also realized that she hadn’t really moved much at all since he had finished. Her hands were gripping motionless on his hips. He could feel that her mouth was slack. Her lower body hadn’t moved in reaction to any of the attention that he had been giving her. And she wasn't making a sound.
Dipper lifted himself off, turning around toward her. “Mabel?” he asked, the first touch of concern blooming in his gut as he saw the look on her face.

Mabel had not enjoyed the end of that experience. At all.
She was not physically hurt in any way, but she was incredibly uncomfortable in a way she couldn’t describe, even to herself. She had gone in an instant from a situation where she was performing a loving act for her brother, to where she felt she had lost all control and thought she could do nothing about what was happening to her. Mabel had no reference to compare to as Dipper thrust his penis into and out of her mouth, shoving her head repeatedly against the mattress. She almost gagged when he pushed himself deep into the back of her mouth, and released his ejaculation into her throat.
She felt … violated!
Is this what … rape … feels like? she wondered as Dipper’s penis shrank slowly in her mouth.
No! she thought urgently to herself, vaguely aware that Dipper was speaking to her while touching and kissing parts of her lower body. This wasn’t rape! Dipper would have stopped if I’d asked! I could have easily pushed him off! Dipper did not rape me!! He wouldn’t rape me!!
Yet as much as she told herself that, she felt disturbed by him as he continued to stroke and caress her, and murmur expressions of love to her. No, not disturbed, she felt repelled by him!
No!! Don’t feel this way!! she screamed inside herself. Dipper loves me! And I love him!! Don’t feel this way!! DON’T FEEL THIS WAY!!! She kept repeating the demand in her head over and over.
Dipper’s face suddenly appeared directly in front of her. “MABEL!!” Dipper yelled desperately, right in her face, while he gently grasped her shoulders, snapping her out of her paralysis.
She focused on him. His face was contorted in shame and fear. Not the imagined Dipper of a moment ago, but her compassionate brother and lover.
"Dipper?" she cried weakly. Unwittingly, her lower lip began trembling, tears welling up in her wide eyes, her breath becoming shaky. She sobbed, a thousand emotions at work. Then she was unable to control herself any longer, and she completely broke down. Dipper held her tightly in despair, repeating apologies over and over through his own bitter tears.
Through her wracking sobs, part of Mabel wanted to tell him that it was okay, to tell him that she knew he hadn’t meant to do that, and that she knew he would never want to make her feel that way. But the words would not come. It was all she could do to hold on to him, to silently trust that the arms that held her would keep her safe.
Dipper was determined to assume every bit of guilt for what Mabel was experiencing. The touch of her naked body against his own felt shameful now, he was getting no pleasure from it.
They didn’t know how long they wept together. At some point Dipper had carefully pulled Mabel to a sitting position, holding her in a protective embrace. Their cries eventually faded to light sobs and sniffles. Mabel glanced at Dipper’s bedside clock, and saw that their parents were due back in less than a half hour.
“We have to get things cleaned up before Mama and Daddy get home,” she said softly into Dipper’s shoulder.
Dipper squeezed Mabel, and exhaled raggedly. “Okay …” he mumbled. Then he slouched his head down and got up, turning away, not wanting Mabel to even look at him.
“It’s all right, Dipper!” she managed to tell him shakily. “It’s okay!!” She willed herself to believe what she was saying.
He stopped for a moment and closed his eyes. Then he drew a sharp breath and pressed the heels of his palms to his forehead. No, it’s not all right, he thought miserably as he left for the bathroom.

The twins washed themselves and got into their customary sleepwear, then got to work. They had to quickly clean up the dishes and correct any evidence of their activity in Dipper's room and the bathroom. Finally, they sat at the dining room table to finish up their homework together. They wanted to make sure that nothing seemed untoward when their parents arrived home, which would be any minute now.
An undercurrent of severe discomfort ran between the twins, as they worked in near silence. They had never felt anything like this before.
I'll be okay, Mabel thought to herself. I'll be fine! Dipper would never try to hurt me. I just really don't want to have to ever do … that again. What if that's a problem for him? I just need a little time, and I’ll be a-okay! … I hope.
What have I done? Dipper worried in his head. She says it's all right, but it's not! She doesn’t trust me anymore. Will she ever trust me again? I love her, but she deserves better than me!
In reality, what happened would not have been a big deal for almost any other couple. It was really just one of those things that didn't quite work out while having sex together. As Mabel had correctly determined, Dipper had not forced himself on her: she could have physically or verbally stopped him right from the instant he started turning them over, or anytime after that. But she had frozen. She was not prepared for anything like that to happen. And Dipper had no experience to guide him on how to moderate oneself when one’s sexual urgency gets too intense.
The truth was that the twins really had been extremely fortunate during their week-long romance in Oregon, especially since they were so young, and as this was the first sexual relationship of both of their lives. They had been spoiled by not experiencing a single uncomfortable or unsatisfying moment between them up to that point: their sex life together had been essentially perfect. Both had unrealistic expectations, thinking that sex would always be wonderful and phenomenal. Now that they had inevitably encountered a very awkward moment, it had hit them with that much greater force, and they both took it extremely hard.
When their parents walked in the door, Mabel’s game face was on, her long-term acting career as the family ham back underway. Their mother asked Dipper how the evening went, and got a polite but subdued reply. The parents chalked it up to typical teenage moodiness, nothing to really worry about.

Later, at bedtime, Dipper was crossing the hall to his bedroom after brushing his teeth, but stopped. He was compelled to go to Mabel’s room and her partly-open door. Mabel was on her bed, lying on her stomach and kicking her legs while reading a teen magazine. Tentatively, Dipper knocked on the door frame, and Mabel looked up. “Hi, Dip!” she said brightly.
“Hey,” Dipper replied gently, mildly surprised at her good mood, and allowing a small smile that reflected hers. He eased the door open further. “Bathroom’s all yours, I’m done.”
“Thanks, Bro Bro! I’m just finishing up this story on Creggy G, and his new solo career! He’s all big with the environmentalist movement. You know, the ‘tree huggers’? 'Dang, Girl!' Hah hah!!” Smiling widely at her own joke, she lowered her face back down to the magazine.
Dipper hovered in her doorway, a glimmer of hope flickering inside him. He glanced up and down the hall. Mom was in their parents’ bedroom, Dad was in the kitchen, both out of earshot. “Mabel?” he asked quietly.
Mabel looked up again with a smile. “Yeah?”
“... We gonna be okay?” Dipper asked hesitantly.
She paused for a tiny instant. "I think so, Dipper. Just give me a day or two, all right?” Mabel’s smiling face never changed expression as she again returned her attention to the magazine. She looked for all the world like she was the giddy teenage girl everyone knew.
Dipper’s eyes widened, the small smile on his face disappearing in a fraction of a second. This was her “Mabel” mask, he realized. He reeled, seeing that even in this private moment, Mabel wasn’t turning “Mabel” off for him. She’d never done that before.
And he couldn’t believe how painful that felt!
Dipper just wanted to let Mabel know how much he loved her. He could safely tell her in that moment, their parents couldn’t hear. He could quickly move to her and hug her, and even give her a few kisses! He could at least walk over to her and offer a fistbump. There were any number of ways to get that simple message across to her.
But at that moment, he was convinced she wouldn’t reciprocate. Nor should she, he thought to himself. The guilt Dipper felt was stronger than ever: he was now certain he did not deserve Mabel's love. The sting prevented him from saying or doing any of those things.
Instead, he decided she was better off without him.
“G’night, Mabel,” he murmured.
Mabel glanced up. “Night, Dipper!” she replied, seemingly happy.
Dipper slowly walked across the hallway to his room, not bothering to say goodnight to either of his parents. He gently closed the door.
The smile momentarily dropped from Mabel's face when she heard Dipper's door snap shut, as she tried to keep sadness and pain from overwhelming her. She forced the smile back again, and continued reading.
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Fistbump 2: Unspeakable (a Pinecest story)