Matsuki, who lost his wife and lives with his son. His son is busy with university and part-time jobs, while Matsuki himself is not in good health and is recuperating at home, so he hires a housekeeping helper, Yoko, three days a week. However, every time she diligently takes care of him, her plump ass drives Matsuki wild… One day, reaching his limit, Matsuki rapes Yoko. Confused by the sudden event, Yoko nonetheless gives in to the pleasure. Afterward, Yoko can't forget the sensation of Matsuki's unstoppable dick and eventually starts offering erotic care herself. However, all this is being watched by her son…
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