A brother and sister, left alone together, find themselves drawn to self-pleasure. The sister, Michelle, fingers her wet pussy and strokes her big ass, trying to stay quiet. Her brother, excited from a workout, bursts into the bathroom, catching her in the act. They argue, but later, they confess their mutual attraction and masturbate openly in front of each other. Michelle's eyes widen at the sight of her brother's thick, straight cock, fantasizing about it plunging into her tight cunt. Just as they're about to act on their desires, someone enters, forcing them to abruptly stop.