Grapevine

Megan moved her legs down your body and intertwined them with yours, locking in a grapevine. "Ha, got you now! Let me know when you give up."

A small groan escaped your lips as your little sister stretched out your legs, causing significant pain in your groin area. But that wasn't the only thing happening down there. Because you two were the same height, Megan's pussy and lower stomach were rubbing all over your penis, only separated by a thin layer of thong. Shamefully, this made you start to get hard despite the action coming from your own sister.

"Come on big bro, I don't have all day." She had a sultry look on her face as she stared down at you, gaining more confidence by the second. Meanwhile, you were in agony at her submission hold.