A curious sister, hearing strange noises from her brother's room, peeks in to find him naked, his back to her, his hand moving rhythmically. As she watches, she realizes he's masturbating, his body tensing as he approaches his orgasm. She can't help but feel a spark of jealousy, wishing she could experience the intense pleasure he's clearly feeling. Their eyes meet in the mirror, and the tension in the room shifts, their mutual attraction impossible to deny.