Yuka's libido has been steadily increasing with age, but her relationship with her husband gradually turned sexless. One day, she discovers his infidelity, and their marriage quickly falls apart. Deciding to divorce, Yuka arranges to meet her son to tell him the news. When she reveals the divorce, her son aggressively advances on her. "No... stop," she protests weakly, but her resistance is futile. Her son ruthlessly thrusts his erect penis into her, and Yuka is instantly overwhelmed by intense waves of pleasure.