One day, the mother witnesses her son washing the underwear that he had wet dreamed in. Not knowing how to do it himself, the enthusiastic mother takes out a medical book and teaches him how to masturbate. From this point on, the mother's sex education starts to go in the wrong direction... She enthusiastically teaches her son everything from how to touch breasts to how to penetrate, and even takes his virginity. In the end, she even gives sex education to her son's friends. The strict and overly enthusiastic mother drowns in pleasure with her son's penis...