A few years have passed since her husband passed away. Kyoko had been living alone in the countryside, but her son and wife were worried about her and asked her to live with them. Kyoko moved to Tokyo and started living with her son and wife. Both her son and wife were nice to her, so Kyoko was able to live happily every day. As their life together settled down, Kyoko also remembered her husband and felt lonely when she saw her son and wife. She masturbated to fill the gap, covering up the days when she made love with her husband. Today, while she was masturbating thinking about her husband, her son saw her and attacked her and penetrated her. Since then, Kyoko has been having sex with her son on a daily basis. At first she was reluctant, but Kyoko was given the joy of being a woman and gradually became her son's woman. One day, Kyoko noticed that she was not tired of her period. After investigating, she found out that her period had ended and she had stopped. Kyoko told her son that her period had ended and that she was no longer a woman, and asked him to end their relationship. Then her son's eyes lit up, and he leaned over her, saying that if that was the case, he could cum inside her without any worries. Yes, Kyouko had been having sex with her son, but she hadn't allowed him to cum inside her. With mixed feelings, Kyouko opened her body. Her son finally released his semen into his mother. Kyouko had already climaxed with her son, but this time, being released inside her brought her a sense of climax, satisfaction, and happiness, and she was once again mired in the quagmire of incest that she had once used for sex with her son...