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With my wife Takako's pregnancy, my mother-in-law Mika came to Tokyo from her hometown. Although she helps with the housework, such as cooking and laundry, our relationship is getting worse day by day, and one day she even bans me from masturbating. For a day, two days, a week... Mika couldn't bear to see me endure the pain, and gently touched my crotch, saying, "I'm not prohibited from doing it with my hands, right?" Ever since that day, my mind was filled with thoughts of Mika, and one day, while she was cleaning, I was aroused by her ass...