JYMA-070 - While my wife was pregnant and I was returning home, I had sex with my big-breasted sister-in-law for insemination, and had forbidden sex with my beautiful and seductive body-sister-in-law, Sui Usami.

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 my wife's older sister came to help me with the housework. When I meet my sister-in-law for the first time in a long time, I find her voluptuous body and mature charm to be stimulating, and even though I think it's no good, I end up seeing her as a woman. I don't feel at ease when I think of being alone in the same house. At that time, when I was looking into my sister-in-law masturbating, our eyes met, and from then on...