Rieko has been married for over 20 years. Just when her son got a job and she was thinking about preparing for retirement, her son came home physically and mentally exhausted from his work at a black company, practically a wreck. Worried, Rieko called out to him, but he was rude and the mood became tense. Rieko used to masturbate when her son wasn't around, but recently she hadn't been able to do it and her body was aching. So she invited her husband to have sex for the first time in a long time. She had no idea that her son was watching her. One day, Rieko was raped by her excited son. From that day on, her son...