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While my wife was on her way home, my wife's older sister, Konatsu, came to see how she was doing. I was happily chatting with a guest I haven't seen in a long time... but when Koji takes a bath, the situation changes completely. "Oh, sister-in-law, please don't come in!" Seeing Konatsu's defenseless and beautiful body in front of me, I thought it was no good, but my lust welled up.