Wedgie

After quite some time you let go and Rosie slumps face first in to the mat. Shes winded and having a hard time getting up.

You dont want to lose you position so you slide forward and spin around, so your sitting just under her arms facing her feet. You hear her grunt as you brace her torso with your legs.

You remind her that this is what she wanted, after all, she challenged you. She starts to say something but stops when you give her ass a hard slap.

She squirms for a second but then you grab her swimsuit and pull as hard as you can. Your Aunts giant ass is on full display as you give Rosie the biggest wedgie you've ever seen.

She stops squirming and starts kicking the mat pathetically. "STOP!" Rosie begs, she sounds like shes crying.

You ask her if she submits.