[Reducing Mosaic]JYMA-056 I ended up having seed-planting sex with my busty sister-in-law who came to help with chores while my wife was visiting her parents during pregnancy.

Three years had passed since our marriage, and my wife became pregnant. She said she would go back to her parents' house for the delivery. I thought maybe I could enjoy single life again, but my wife's younger sister came to help with household chores. It had been a while since I last saw my sister-in-law; she had grown bigger breasts and looked more mature and attractive. Though I knew it was wrong, I couldn't help but look at her as a woman. The thought of being alone with her in the house made me uneasy. Then, one day, I caught her masturbating, and I couldn't hold back any longer. From that point on…