Three years into our marriage, my wife is pregnant. She's decided to return to her hometown to give birth. I was thinking it would be nice to have some time alone again, but my wife's sister came to help out with chores. Seeing my sister-in-law again after so long, her voluptuous body and mature allure were incredibly stimulating. Even though I knew it was wrong, I couldn't help but look at her as a woman. Being alone with her in the same house made me uneasy. Then, while I was catching a glimpse of her masturbating, our eyes met, and from that moment on, things took a turn...
