[JYMA-050] Miki Horikita, a brother-in-law who had sex with his sister-in-law who came to help with the housework while his wife was pregnant and on her way home. (Censored)

Three years after we got married, my wife became pregnant. My wife decided to return home, saying she would give birth at her parents' home. I thought it was okay to be single for the first time in a while, but then my wife's sister came to help me with the housework. I met my sister-in-law for the first time in a long time and she seems cute, has a good figure and is attractive, so even though I think it's no good, I see her as a woman. I don't feel at ease when I think of being alone in the same house. At that time, I saw my sister-in-law masturbating, and I couldn't resist it and approached her. After that...