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The Minami family is famous for being a mandarin duck couple. However, the wife, Shiori, has a dark side. One day, the caretaker wonders why a strange man is frequently coming and going from the Minami family home, so he sneaks in to see what's going on inside and witnesses a prostitution scene. When he visits again the next day, he finds the wife without panties, sticking out her ass and waiting for customers. The caretaker loses control at the shocking sight and thrusts his penis into her. He cums inside the surprised wife with all his might. From that day on, the innocent wife becomes the caretaker's masturbator wife.