As siblings Michelle and her stepbrother find themselves alone, they succumb to their secret desires. Initially, they retreat to their rooms, Michelle fingering her wet pussy while he jerks off to thoughts of her. Caught in the act, they argue, but later reunite, naked and horny. Michelle takes in his thick, straight cock, fantasizing about it filling her tight cunt. Just as they're about to act, an intruder forces them to halt their taboo tryst.