Bored siblings Michelle and her stepbrother Paul find themselves alone and horny. Michelle retreats to the bathroom, fingers her wet pussy, and strokes her big ass. Paul catches her, and their argument escalates until Michelle calls their mother. Later, they apologize and decide to masturbate openly. Michelle admires Paul's thick, straight, huge cock as he jerks off. She fantasizes about feeling it inside her, but their moment is cut short by an unexpected intruder.