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One night, the couple's activities are seen by the son and daughter. And the distorted sex education of the Igarashi family began with the daughter Mari's words, "Does it feel good to have sex with your father?" In the bath, she teaches fellatio, and in the children's room, the mother teaches her son, and the father teaches her daughter individual sex lessons. And practice what I learned with my brother and sister in front of my father and mother.