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It’s been two years since I got married, and I’ve been living with my older brother and his wife, who moved to Tokyo for his job transfer. My brother’s wife—my sister-in-law, “Mami”—has a cheerful personality and is always friendly with me. Mami and I have a relationship we can’t tell our respective partners about: an “affair within the family.” Since I mainly work from home, we spent a lot of time together. She made the first move, and because we were so compatible, we started having sex that very day…