A curious teen girl, alone and bored, decides to explore her body's pleasures. She tentatively touches herself, gasps at the new sensations, and begins to masturbate. Her brother, hearing her soft moans, investigates and catches her mid-act. They argue, but the tension between them shifts, and soon they're both naked, openly masturbating in front of each other. The brother's thick, hard cock catches the girl's eye, and she fantasizes about feeling it inside her. Just as they're about to act on their desires, a parent enters, forcing them to abruptly stop.