Nozomi enjoys a happy marriage, but her sex life leaves her frustrated. Meanwhile, the father-in-law living with them still passionately fucks his wife every night. Driven wild by the perfectly timed pounding she hears through the walls, Nozomi finally slips into his bed and seduces him. His hesitation soon gives way to relentless, machine-like thrusts that keep her cumming as he creampies her again and again, even after her orgasms.