Bored and sexually frustrated, a brother and sister resort to masturbation to pass the time alone together. The sister, Michelle, fingers her wet pussy and strokes her big ass, trying to be quiet, but her stepbrother catches her in the act. They argue, but later, they decide to masturbate openly in front of each other. Michelle takes in her stepbrother's thick, straight, huge cock as he jerks off lustfully. She fantasizes about feeling that massive dick plunging into her tight cunt, and just as they're about to act on their mutual yearning, someone enters, forcing them to abruptly end their erotic encounter.