David finds out the hard way that Cherilyn, his step-sister, is much stronger than she looks. Cherilyn likes to scissor, but she favors the grapevine simply because she can stare at her immobile and helpless step-brother. Helpless, he felt the sense of total humiliation and subjugation that swept over him as he was imprisoned in an embarrassing wrestling hold, a big step-brother held captive in the vice-like grip of a smaller and younger step-sister's thighs .