After three years of marriage, my wife became pregnant. My wife said that she would give birth at her parents' house and decided to return home. I thought it would be possible to live a single life for the first time in a long time, but my wife's sister came to help me with housework. My sister-in-law, whom I haven't seen in a long time, seems to be cute, has a good style, and is attractive, and although I think it's no good, I see her as a woman. It's uncomfortable to think that two people are alone in the same house. At that time, I saw my sister-in-law masturbating, and I couldn't stand it and approached it. Since then...