Miki, a housewife who remarried her new husband and started a new life with her son, Junpei. Junpei is also fond of her husband, and she seems to be like a father and son who are connected by blood. However, perhaps because of their good relationship, her husband inculcates radical sexual knowledge to Junpei. Miki, who is worried about Junpei's future, tries to give her husband a correct sex education in her own way without telling her. How to kiss, how female genitalia works, and even insertion ... - She generously uses her plump body and big to teach her son loving sex.