The husband quit his job and drank alcohol every day. Reiko would clean the house after coming back from her part-time job. The husband, aroused by seeing Reiko's ass, pushed her down. Their son was peeping at this. Unable to climax due to the forced sex, Reiko masturbated. Her son was also peeping at this. One day, while Reiko was masturbating in the kitchen, her son came over and said, 'I saw you having sex and masturbating. I can't hold back anymore,' then pushed her down. From that day on, Reiko and her son began their forbidden secret affair behind the husband's back.
