One night, the couple's activities are seen by their son and daughter. - And the distorted sex education of the Shoda family began with a word from her daughter Mari, "Does dad sex feel good?" - In the bath, she teaches blowjobs, and in the children's room, a mother gives her son a sex lesson and a father gives her daughter a sex lesson. - And I practice what I learned with my brother and sister before my father and mother watched over me.