Two devout sisters, Michelle and her brother, find themselves in a tense situation when their mother leaves them alone. Bored and frustrated, they turn to self-pleasure, but their encounter escalates when he catches her masturbating. They argue, but soon they're both naked, Michelle admiring his thick, straight cock. She fantasizes about feeling it inside her, and they're about to act on their mutual desire when someone enters, forcing them to abruptly end their erotic encounter.