Jumping Jacks!

"Okay, first lets warm up with some jumping jacks!" Vanessa said. "Now, remember what I told you about giving your best effort Lauren."

Lauren remembered very clearly Vanessa's clear threats. She wasn't sure how Vanessa would make things even worse if she disobeyed, but she believed her sister could find a way. Her fear kept forcing her into more and more embarasing situations, but what could she do? So she stood in a semi circle with Britney and Vanessa, all in their matching workout outfits, although their bodies didn't amtch at all.

"Ready? Begin! One! Two!" Vanessa started a brisk pace of jumping jacks that her and Britney easily kept up. Lauren however, who'd eaten several oversized meals in the day and was utterly bloated, was struggling to keep up. It didn't help that her outfit was severely undersized, cutting into her body uncomfortably as she jumped and clapped.

"Seven... eight..." Vanessa went on, her and Britney smoothly doing the motions. Lauren stumbling along after them. Her shorts, which she'd struggled so hard to get back in place, instantly rolled back up between her cheeks. She felt the wedgie cutting into her backside. Looking down, Lauren was horrified to see the sheer amount of wobbling her body was doing. Every jump her stomach, hips and thighs shook violently. Just when they were about to stop she had to jump again. It was an unyielding display of the fine layer of fat over her form shaking wildly and non stop.

She looked up at Britney and Vanessa. They were unfazed, they're faces placid. They're toned bodies didn't jiggle. The only movement over their figures was their chests. Both of them had large breasts barely contained by the sports bras they wore. Every jump caused their huge mammaries to spring up, then shake their way back down.

Lauren looked down. Her chest, covered by a tight sports bra, looked comically undersized next to theirs. It was just about the only part of her body not shaking. What was there to bounce? Just two little mounds. Her nipples were vibrating, clearly showing through the fabric. But that was about it.

Mark watched the whole display in growing amusement and growing arousal. It was hard to say what was effecting him more: seeing the ice queen debutante shaking her scantly clad, surprisingly thick body with her bright red cheeks, or Britney and Vanessa, jumping with her firm curvy forms and large breasts. Either way he was quite happy to watch!

Finally, after twenty jumping jacks they stopped. Britney and Vanessa were unphased, though Lauren was breathing a bit heavy, hair wild, face red for more reason then one.