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Yuka and his wife are working hard to make children for their father-in-law who has begun to suffer from cataracts. However, due to pressure, her husband Ji Po is useless and Yuka becomes frustrated. One day, Yuka discovers that her father-in-law, Ji Po, is erected while caring for her, and involuntarily indulges in masturbation. And gradually, Yuka's desire was solicited, and finally she started taking care of her father-in-law, Shimo.