Caught in the throes of teenage hormones, step-siblings Michelle and her brother find themselves alone and bored. Michelle retreats to the bathroom, touching herself tentatively, her breath hitching as she imagines her brother's thick cock. He bursts in, catching her mid-act, and tempers flare. Later, they make amends, masturbating openly, their bodies on full display. Michelle's eyes widen at his size, fantasizing about his cock filling her. Just as they're about to succumb, an intruder forces them apart.