While his wife was pregnant and visiting her parents' home, he engaged in forbidden sexual acts with his beautiful, voluptuous, brown-haired sister-in-law. (JYMA-081)

Five years into our marriage, my wife became pregnant. She said she wanted to give birth at her parents' home, so she did. I thought to myself, "Finally, I can enjoy some single life!" But then my wife's older sister came to help with the housework. My sister-in-law, whom I hadn't seen in a long time, was beautiful and charming, exuding a mature allure that made me unable to resist seeing her as a woman. Living under the same roof, just the two of us, made me uneasy. Just then, I secretly watched my sister-in-law masturbate, and she discovered me. From that moment on, we began our immoral...