Her remarried husband is busy, and her son-in-law is a recluse... Yukari, who is happy with her beloved but feels lonely, witnesses her son-in-law Hiro masturbating. Yukari, who is young and unable to hide her agitation and excitement from seeing his erect dick, secludes herself in the bathroom and soothes herself by masturbating. After learning that her step-son's withdrawal was because he was disliked by girls, Yukari decided to teach him how to handle women's bodies in order to overcome his trauma towards women. . Yukari, who had not had sex with her husband, was struck by her step-son's awkward touch with her body, and soon he saw her leaning forward and showing her his feminine face. ``Yukari'' is joined by her raw insertion, and her stepson's young and hard dick feels irresistibly as he shakes his hips violently, and is desired by Hiro-kun, who is absorbed in the sex she has just learned. I'm going to get my girlfriend back. ``Which feels better, Dad or me?'' ``I like your dick, Hiro!'' Driven by a sense of immorality toward her husband, mother and son love each other, devouring each other's bodies day in and day out. With forbidden incest, the barrier between parent and child has been crossed...
