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Fistbump (a Pinecest story)	By : Edward_or_Ford Category: +G through L > Gravity Falls Views: 13063 -:- Recommendations : 1 -:- 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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The twins left the museum shortly after, and took the MAX streetcar train back towards downtown Portland. After a quick transfer, they were crossing the bridge back across the river, heading toward an afternoon of shopping at the mall.
Dipper was grateful that Mabel had respected his desire to not discuss the “incident.” He nudged her leg with his knee. “Hey,” he said with a small smile, “I am sorry for freaking out back there. I guess … that was as uncomfortable for you as it was for me.”
“Yeah,” Mabel replied, thankful Dipper had broken the ice. “It was pretty intense.”
“But I’m done with that,” Dipper continued, smiling bravely. “This is our day together, and I want to have a good time, and not be a stick in the mud.” Dipper looked at Mabel’s face for agreement. “Are … we okay?”
Mabel paused for several moments, seemingly for dramatic effect. Finally, she answered his question. “That depends,” Mabel replied craftily. “How good of a shopping buddy are you going to be for me?”
Dipper sighed, but knew he owed her one. “I will do anything a “shopping buddy” needs to do,” he promised.

Being a shopping buddy sucked.
For Dipper, the first part of the visit to the mall was fine. He and Mabel sat at the food court and ate lunch, reminiscing on the previous summer’s adventures. They stopped by the Apple store and browsed in the Game Stop for a while.
But they found that this was a fairly upmarket mall, with stores that tended toward the high end. As much as Mabel liked to admire the “shiny” things in life, she knew she couldn’t afford most of the clothes and jewelry they were seeing, and they really didn’t suit her well anyways.
So Mabel dragged Dipper around downtown. She found smaller, funkier stores, where she could find stuff that were more to her offbeat tastes, and her more modest means. Not ignoring her brother, she made sure that he found a nice sport jacket and tie, which she knew would go perfectly with his shirt and pants back in the hotel room. But the majority of Dipper’s time was spent waiting on Mabel to look around in a store, try a thing or two on, be forced to offer his opinion on how it looked (and then have the opinion ignored), then on to the next store. The only thing that kept him from losing it on Mabel was his promise to her that he had made on the streetcar.
It was getting late in the afternoon, and they were headed back to the hotel, when Mabel saw one more store she had to visit. It was advertising an end-of-summer sale, and she told Dipper that since fall weather in the Bay area could be as warm as summer in Oregon, she couldn’t resist. Dipper grudgingly followed, under the weight of Mabel’s bags.
While Dipper was looking for a place to unload the bags on the floor and rest his arms, Mabel looked at the “summery” clothes. The shirts and blouses all had such low necklines, and the shorts and skirts looked like they showed a lot more leg than she was used to. She found some of the more suitable pieces she could, and told Dipper to camp out near the changeroom.
Mabel strutted around in front of the large mirror with some of the outfits she had chosen. The girl who looked back at her from the reflection appeared far more mature and urban, and even Dipper offered that she looked good. Mabel grinned, and found a pair of high-heels to compliment the clothes. She was a bit unsteady on the stilettos, but when she got the strut down, the shoes certainly added to the look. Heading back into the dressing room, she told Dipper she was almost done.
Yawning broadly, Dipper was examining his phone. It was getting late, they’d have to hurry along if they were going to have time to change at the hotel and get to the restaurant in time for their reservation. He heard the dressing room door open, and was putting the phone in his pocket as he looked up.
He was sure that it was not possible for his heart to stop, but it certainly felt that way.
Mabel was still wearing the high heels. She just wasn’t wearing much of anything else. She had put on a criminally small black bikini, which stood out in stark contrast to her fair skin. The fabric triangles were barely large enough to cover much of even Mabel’s small endowments. The strings that connected them were tiny, with knots that invited untying. The strings that held the bottoms were tantalizingly low on her maturing hips. The high heel shoes forced her into a pose that thrust out her breasts more impressively than she had thought possible.
She had a strange mixture of determined mirth and terror on her face as took two steps out of the changeroom. She turned, showing Dipper how her long brown hair hung impressively down her nearly naked back. Below that was, well, virtually nothing. The back of the bikini’s bottoms were merely strings, which served to draw attention to Mabel’s firm butt. Nothing was left to the imagination.
Looking back at her immobile brother, Mabel chirped, “Okay, I think I’m done now!” Then she strode back into the changeroom. Or tried to, as she stumbled over her high-heels on her first step and crashed into the small room. “I’m okay!” she cried out helpfully, and clumsily slammed the door.
Dipper’s heart eventually restarted, though his mouth was still agape. Holy shit! That was the only words he could think. The rest of his mind was trying to fathom the wondrous images relayed by his eyes. It was true that he had never in the flesh laid eyes on any girl so close to completely nude in his life. But it wasn’t just her face, skin, and her figure: it was more. It was the attitude, the seductive poses. It was the tiniest mystery of what was still hidden under the bikini. He was hard pressed to imagine anyone could have looked more desirable to him. She was stunning, his very definition of sexy! Everything about her had screamed out to him to ravage her, to forget any pretense of discomfort, any issue of embarrassment or moral questioning.
But he couldn’t forget. Oh, he was very pleased with the display, and amazed that his sister had done this in front of him. But Dipper was at least aware of just what part of his body was sending signals to his brain. These were feelings of lust, and he knew it. That was fine for dirty pictures or porno movies. Someday, when he was older, he wondered if he may be okay with lust for a casual girlfriend. What was the term, a “fuck buddy”? Maybe someday. But this? No, he knew that would be very wrong to act on. Not at his age, certainly not with Mabel! He was simply incapable of debasing himself like that. Dipper’s moral compass easily overcame any urges that his hormones could possibly put forward. He would not be a slave to his penis.
Besides, it was a moot point anyway. Mabel would certainly not be interested in letting him touch her that way! And he cared about her far too much to do that to her!
So Dipper was left with wondering what was up with Mabel, and why she had put on this exhibition. He was thankful that the show had been brief, and that he’d had time to settle down a bit, such that he was now only half-hard. She emerged from the dressing room, carrying several of the clothes she had tried on, plus one pair of high heel shoes and two tiny black garments. Smiling sincerely at Dipper, she breezed by him and headed for the cashier at the front of the store.
“Wait, what was that all about, Mabel?” Dipper asked quietly as he walked after her.
Mabel stopped and turned. With a playful expression and genuine smile, she replied in an exaggerated tone, “Oh Dipper! I don’t want to have this conversation! Please, please can we drop this, at least for now?” She was mocking his words from earlier, but in a way so he knew there was no actual animosity. Mabel was in one of her silly moods, and she was telling Dipper he would just have to wait for an explanation.
“Don’t forget to bring all our shopping bags!” she said brightly, resuming her route to the cashier.

The short walk back to the hotel yielded no explanations to Dipper for Mabel’s sudden odd modelling choice. In their room, Mabel sweetly told Dipper that she would tell him everything soon, and that he should be in no hurry. They changed into their semi-formal attire, and Mabel pronounced them a very smart looking couple, indeed!
On their walk to the steakhouse, Mabel cheekily took Dipper’s hand, making no pretense of subtlety like she had that morning at the museum. As they walked, Mabel was prancing and swinging their joined hands higher and higher, all the while commenting on the beautiful weather between humming upbeat pop music. She was hamming up her performance tremendously, and Dipper had found himself more and more amused by her antics, in spite of his curiosity.
Mabel was very pleased with herself. Her off-the-cuff plan was working out perfectly.
The plan had taken just a few seconds to hatch, back on the streetcar from the museum. Dipper had just been apologizing for flipping out over his woody, saying he just wanted to have a good day and move on. Mabel still wanted to tell him that she liked it that he had been aroused by her, but knew that the subject was delicate for him, and bringing it up again now would make him really uncomfortable, maybe even angry with her. There had to be another way to show him.
Then the idea materialized. She would show him! Dipper obviously was turned on by her body, so she would make sure he got a real eyeful! Then he would have to know that she was okay with being sensual towards her brother, and that his erection had been not only forgiven, but welcomed! Then they’d be able to have a meaningful conversation, where she would try to bring up how she felt about him, that she loved him as much more than her brother. She knew that now, even more convinced of it than she was that morning in the shower. She wanted to touch him, hold him, love him: to be in a real relationship with him. Forever and ever.
But back to her plan. How could she arrange to have Dipper see a lot “more” of her than he was used to? And wouldn’t he call her on it when it happened? To be sure, she wanted to have that conversation, but it had to be done carefully. Maybe somewhere a bit public, so she would be sure that Dipper wouldn’t freak out and he’d have to listen to her. She remembered their dinner reservation before the show coming up that evening. The perfect place for their heart-to-heart! So Mabel’s grand reveal had to be just before that. The hotel room, just before leaving for the restaurant? Just get naked in the bathroom and walk out? No, that would be too much, Dipper would probably have a fit. Again, she needed a more public setting. How would she manage that? Well, duh, they were on their way to go shopping right at that moment, how about a skimpy bathing suit? Perfect! She informed her brother that he would be her “shopping buddy” for the day, to make sure he stayed close as she found the right moment.
Mabel got lucky, as she was not finding many bathing suits in the stores (given it was late in the summer) when she spotted the store with the end-of-summer sale. Her attention focused on the black bikini almost instantly, but she also saw the other clothes that she actually wanted to try on, so she couldn’t waste the opportunity. Besides, Dipper might see her pick up the swimsuit, and she wanted it to be as unexpected as possible. The high heels were a last-second addition to her plan. She waited until Dipper was engrossed with his phone before plucking the bikini (two different sizes, just in case) off the rack on her way back to the dressing room for the big change.
There was nervousness as Mabel put on the bikini. Oh my God, she thought, it was even smaller than she thought! There was very little coverage of even her breasts. The bottoms only stayed up with the assistance of magic, apparently: how else to explain that they just didn’t fall down over her hips? And the back! The bottoms didn’t cover her butt at all, just a string down her crack. How do they get away with making things like this? But she steeled her nerves, hoping beyond hope that this would work, and forced herself to open the door. Dipper’s reaction was priceless to behold, and it helped her to step out and show herself off to him. His wide-eyed and open-mouthed expression of shock told her that she effect was perfect, and her apprehension disappeared. She turned and struck a pose she hoped showed off her behind. Seeing where his eyes were focused on, she knew that she had succeeded. Mabel was delighted, and even losing her balance on her high heels didn’t dampen her spirits.
Mabel was pumped. Dipper held his tongue on why she did it, as she asked him to. As they approached the door to the restaurant, she was still sashaying around with anticipation. She would get him to admit his desire, and she would spill her soul to him. The plan was working out exactly as she wanted. How often does that happen?
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Fistbump (a Pinecest story)