Bored siblings Michelle and her brother find themselves alone, resorting to masturbation to pass the time. Michelle's moans alert her brother to her pleasure, leading him to catch her mid-act. Angered, Michelle calls their mother, but later, they reconcile. Naked and aroused, Michelle watches her brother stroke his massive cock, fueling her desire. Just as they're about to give in to their taboo urges, a visitor interrupts, forcing them to halt their incestuous encounter.