To the gym, to train with the Fighting Twins

Your tiny body is **** to bear the brunt of Betty's gigantic ass as she heads to the gym, your head squished between its thick cheeks while your cock occasionally jabs against its jiggling flesh. The jiggling is especially bad since she's in such a rush to get there, keeping to a brisk pace. The bouncing eventually stops for a few moments when Betty finally reaches the gym and pauses to look around.

"Hey, Betty! Over here," a cheerful voice sings. Betty turns her head to see Sammy and Tammy Lee, the Fighting Twins, across the room from her. Tammy, clad in a gold sports bra and black spandex shorts, energetically waves to Betty while sitting atop a yoga ball resting on a small mat. Nearby, Sammy, wearing a silver sports bra with black spandex shorts, is in the middle of lifting weights on a bench nearby.

You feel the bouncing resume as Betty strolls over to meet them. "Hey, girls."

"Glad you could make it," Tammy says as she playfully bounces atop the ball.

"You're late," Sammy says plainly, mostly focused on finishing her set.

"I know. I'm sorry," Betty confesses. "I was in the middle of a phone call and lost track of time."

"It's just as well," Sammy says as she puts her weights down and looks at Betty. She gestures at her sister, who's still playing on the yoga ball. "Unlike me, this slacker over here still hasn't finished her warm-ups yet. She should be doing crunches right about now."

Tammy sticks her tongue out at Sammy for a moment, then says, "Well EXCUSE ME for trying to have a little fun. Maybe some of us just don't want to turn into musclebound meat heads."

"Whatever," Sammy growls at Tammy. She looks back at Betty. "Maybe now that you're here, she'll start focusing finally. Watching you going through your warm-ups might motivate her to finish hers. Once you guys catch up, we can all move on to the next part."

"Sure," Betty says before joining Tammy on the mat. Sammy returns to lifting weights, but, to her annoyance, Tammy still seems focused on playing around, even as Betty starts warming up.

Tammy might not be focused on Betty's exercising, but, thanks to your precarious position against her, it's all you can focus on. Standing in place, Betty begins a series of stretches, twisting and contorting her body into a variety of shapes, and each pose makes her glutes tense and flex, squishing your head even harder between them. The immense pressure makes you feel like you could pass out any moment, especially when ever she bends over to touch her toes, hiking your dangling body in the air as her round, full ass tightens around you. You feel even more lightheaded whenever your cock presses against her soft flesh amidst all the movement. Betty's ass cheeks continue to relentlessly grind you between them as she moves on to a set of lunges, only giving you brief respite at the beginning and end of each repetition. **** for freedom, you press your tiny hands against your unaware captor to pop your head out from her massive butt, but they can only helplessly sink against her pliant, overwhelming flesh.

Eventually, Betty finishes that part of her warm-up, giving you a moment to breathe (not that you've been getting much air from between her huge butt cheeks). "Great, now that I'm all limbered up, it's time to get the heart racing," she says before grabbing a nearby jump rope. Suddenly you feel weightless as Betty begins her set, bouncing in place with the rope while inadvertently making her plump butt jiggle wildly. Your head still held in place by her butt, your flailing body repeat swings into the air before crashing back against Betty's butt, your cock jabbing against it each time. Betty's butt bounces so wildly that you quickly feel dizzy, and, what's more, you feel that familiar shrinking sensation returning. You couldn't possibly shrink any further than this, could you. As Betty continues skipping rope, you can only hope someone finds you before you have to find out.

Before long, you feel Betty's tempo quickly increasing. She's really getting into this. You hear Tammy give a whistle in admiration, Betty's skill with the rope finally drawing her attention. "Wow, Betty, for a girl with your proportions, you're really good with that rope, and you put on quite a show with it too," she says, playfully referring to how much Betty's massive breasts and butt bounce while she quickly jumps rope.

"Haha, thanks, Tammy," she replies while still bouncing in place. "It's not as hard as you might think. I could show you sometime, if you like." After what feels like an eternity, Betty finishes with the jump rope, leaving you reeling while her jiggly body (eventually) comes to a stop.