Three years into our marriage, my wife is pregnant. She decided to return to her hometown to give birth. While I was thinking it would be nice to have some time alone again, my wife's younger sister came to help out with housework. Seeing my sister-in-law again after so long, she's all grown up, with a great figure and an alluring presence. I know I shouldn't, but I can't help but look at her as a woman. Being alone with her in the same house makes me uneasy. One day, I caught her masturbating and couldn't resist approaching her...
