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Ryo, a mother who has raised her only son, Makoto, by herself since she broke up with her husband. Ryo gives Makoto an excessive education with an eye on the future, just as his ex-husband, who was in financial difficulty, becomes a teacher. However, as Makoto grows older, he gradually suffers from sexual desire and becomes distracted from his consciousness of studying. Ryo thinks about his son's future, and knows that it is contraindicated, but he uses his mouth to eliminate his desire. However, that act also ignites Ryo's hidden desires. Sex education escalated, not only the mechanism of the female body, but also the feel of the female genitals and the intense production act.