New Abnormal Sexual Intercourse: A Forty-Year-Old Mature Mother and Son, Part 5. A lustful mature mother, Yamaguchi Reiko, is overwhelmed with ecstasy after being embraced by her adoptive father and raped by her son. (SMOM-007)

Kiyo (Reiko Yamaguchi)'s husband is away on a post alone and rarely comes home. Her son spends all his time locked in his room. Kiyo begins to discuss family matters with her adoptive father. Although encouraged by him, she still indulges in masturbation due to loneliness and isolation. One day, she confides her dissatisfaction with her husband to her adoptive father. Under his gentle comfort, they kiss and have sex, seemingly drawn to each other. All of this is witnessed by her son in the hallway. The next day, her son confronts Kiyo, verbally abusing and assaulting her. Then, summoned to her son's room, Kiyo is forced to promise "anything," resulting in everything from oral sex to intercourse…