“Somebody help me!” Gina boohoohooed constantly, never having felt so helpless. Lying on her back, she still remained trapped between the fatty boulders as they undulated up and down, one after the other, with each of Penny’s pedals. One of the massively heavy weights would go up, grinding and even twisting Gina as they kept her so tightly compacted, and making her groan loudly in pain. Then, as she her tiny body drifted near where the cheek used to be, it was slam back down, squishing into the seat and forcing her weak body back into the crack, where Gina would be put through the same thing by the other cheek, and all of this was happening at what seemed to be such incredible speeds.

Of course, that was merely because of how little she was, as Penny was just humming happily while only casually pedaling on her exercise bike. Working out was always a pain in the butt, but now that the biggest pain was in her butt, exercising had become a delight. Just feeling fat buns so tightly packed into her shorts as they flexed and bounced with her work made Penny smile, always happy to have a fantastic booty, and she wanted to make sure it was comfortable as possible.

“Ooooh, this seat feels a little undersized. I don’t know, what do you think, Gina?” turning her head back, Penny kept smiling as she watched herself shift her butt on the seat, trying to get comfortable. One little girl was anything but comfortable as the undulating cheeks now suddenly began to shift and squirm and took her along for the ride. Gina found herself abruptly forced face first into the side of the left cheek, once causing her mouth to fill with greasy ass fat, as well as have it all push to roughly into her boobs and crotch and every other inch of her naked form. The next thing she knew, the butt thrust back and she went zipping between the chocolate orbs, ending with her head poking right out of the crack and outlined in the panties. A silent scream was depicted in that sight as she was sucked back in just as Penny began shifting from side to side.

“That’s it, I like that.” Penny whispered to nobody, still pedaling, but ‘enjoying’ this more and more. The tiny form of Gina Diggers was constantly digging into either of her ass cheeks as she squirmed from left to right, nearly sending half of her rump off the seat as she mashed her lousy friend. Licking her lips, Penny thought about Gina being tossed around in her crack, such a little powerless thing she had been reduced to, but this wasn’t enough. The little skank had been bounced around enough; it was time to be crushed!

Lifting her butt slightly into the air for half a second, Penny slammed it back down onto the seat, making Gina splat right from between the now relaxed cheeks and directly beneath them. She groaned and rolled onto her side, but brown boulders crushed her once more, making her stay firmly on her back now, and looking back up, Gina screamed as they came ramming at her even faster than before.

Penny acted like she was in a race as she put this bike to the test, going fast enough that smoke began billowing out from the machine. For Gina, it was like she was caught in a continuous barrage of the worst punches she had ever gotten. The giant weights pounded her so hard as so fast, she might as well have been being beaten by Cheetah. Every second was filled with this constant pummeling of butt fat and muscle, leaving Gina unable to do anything but just lie there and cry. It hurt so badly and she feared that she was going to die. Killed by a butt; what a way to go.

She knew it was coming, every blow felt strong enough to crush or flatten something, and she couldn’t even bawl as much as she wanted since her was also being slammed along with the rest of her, and somehow, things found a way to get even worse. As if the repeated pounding wasn’t horrible enough, Gina also had to put up with just how sweaty and disgusting things were getting now. Bad enough that she was stuck in a butt, but now Penny was really getting herself worked up and it all felt like a smelly, slippery furnace down there. The slick buns slid all around Gina’s body, soaking her in the heavy sweat and stinging her eyes along with the rank stench of ass and perspiration. This was hell, trapped forever and relentlessly assaulted by a giant she-devil’s rump. It made her gag painfully and the only thing that kept her from puking was the beating of the buns smashing her insides so much. It was all so horrible, but then she realized that it was also confusing.

Gina blinked in the midst of her torment, now unsure of how she got here. Obviously it was her inability to deny her pussy around Ace, but last time she checked, she had been under Penny’s rump and getting a beating. Now she was going through that but back in the crack, and for the first time since she was twelve, Gina felt a little flat.