As Michelle's untouched pussy dampens Jake's shaft, he can't help but thrust gently, eliciting a soft moan from his sister. Their bodies move in a sinful rhythm, haunted by the knowledge of their taboo lust. Michelle's hands, once clutching her clothing in fear, now tentatively explore Jake's body, tracing the lines of his abs and the curve of his ass. Jake, driven by primal instincts, grinds against Michelle, his cock sliding along her slick folds, teasing her untouched entrance.