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Takuya, a son who looks into the body of Yumi, a mother full of flesh, from behind. The feeling of respect for her mother was distorted, and she couldn't control her desire to own herself as a woman. "It's a gift for my mother." One day, Takuya attacks Yumi and wears a chastity belt in her crotch. "From now on, I will manage my mother's sexual desire." Yumi couldn't even talk to her beloved husband, and her growing desire soon reached its limit.