On a lazy weekday, siblings Michelle and her stepbrother find themselves alone and horny. She starts by fingering herself in the bathroom, but he catches her mid-act, leading to a heated argument. Later, they make amends and decide to masturbate together. Naked, Michelle takes in his thick, straight cock as he jerks off, fantasizing about being filled by it. Just as they're about to act on their mutual desire, someone enters, forcing them to abruptly stop.