You play the truth of Dare with Mommy because you think mom is a vampire. Mom IS a vampire and doesn't think you're a convincing slayer, and even a crucifix doesn't make her finch. No Slayer has ever found her spot, and if her son makes her cum first, then mom loses all power over him, but if he cums first, he is hers forever. Mother and son have a sex fight, and Mommy is so horny, and he needs to slow down; mommy can't take this, so she goes to bite him. Only to be staked in the heart. Mom and son continue to fuck until both cum and mommy passes/