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In the middle of my forties, I married my childhood friend, my younger wife. My wife doesn't respond to night activities because she is busy with work, contrary to me who is impatient to make children. In the end, I was told that I would put up with it for a month. And a month later, I couldn't have sex with my wife, so I went home to celebrate the enrollment of my sister-in-law, Ichika. While spending time suppressing the sexual desire that seems to explode, one of my sister-in-law approached me many times with a fearless smile.