JYMA-050 Brother-in-law Miki Horikita had sex with his sister-in-law who came to help with the housework while his wife was pregnant and on her way home.

Three years after we got married, my wife became pregnant. Her wife said she would give birth at her parents' house, so she decided to return 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 her with the housework. I met my sister-in-law for the first time in a while and she seems cute, and she has a good figure and is attractive, so even though I don't think she's good, I see her as a woman. I feel uncomfortable when I think of being alone in the same house.