In a college dorm room, Piper Perri's frustration boils over, leading her to masturbate wildly, panties aside, fingers deep. Carter Cruise, her stepsister and roommate, enters, catching Piper in the act. Aroused by the sight, Carter can't help but join in. They engage in a heated, rough scissoring session, Carter's face buried in Piper's dripping pussy, their moans echoing through the room, until a sudden noise forces them to freeze, their taboo play interrupted.