Busy with housework, her relationship with her husband has cooled, and her ripe body is wasted, Fumika, a mother, masturbates almost every day to console herself. One morning, in her son's room, Fumika sees his crotch erect. She pulls down his pants unnoticed and tastes it as she desires, but her son wakes her up in the middle of it. Fumika hurriedly hides and sees her son masturbating when he wakes up.