I was enjoying living alone for the first time in a long time. My wife was pregnant and had gone back to her hometown. My sister-in-law Miyuki came to check on me, worried about me being alone. I was fed up with the messy house, so I took this opportunity to invite her in, but then Miyuki suddenly said something strange, with a suspicious smile on her face. "They say that men are most likely to cheat when their wives are pregnant. Maybe it's just building up inside you?" She said this and looked at me as if she was targeting prey...