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Her husband was assigned to a single job, and Hinami was living a life of repeated cheating without being able to endure loneliness. However, one day, her son-in-law Yuichi sees her having phone sex with her cheating partner. Sweat dripping from a plump body, dripping drool, and lewd juice overflowing endlessly from the crotch. Yuuichi is more lustful than angry at the too obscene sight that his mother-in-law showed. Yuuichi makes an unexpected proposal to Hinami. "I'll be your partner instead of your father."