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Ayako Inoue is not worried about her son who is not interested in the opposite sex. - Because she thinks of her son too much, she decides to teach her sexuality herself. - Starting with her masturbation method and escalating, her Ayako's surname education eventually evolves into her son's writing brush. - Ayako, who was sexless and hungry for her husband, couldn't forget her son's cock, and the two fell into a forbidden relationship.