After my wife's father passed away, her mother, Kozue, was left to live alone. Concerned for her, my wife and I decided to have her move in with us. Kozue treated me kindly, and our cohabitation seemed to be going smoothly. However, ever since we started living together, my wife began rejecting intimacy at night. As a result, I fell into a sexless marriage, and I gradually found myself indulging in fantasies about my voluptuous, affectionate mother-in-law. One night, unable to sleep, I peeked into Kozue’s bedroom and caught her pleasuring herself. My heart raced—I rushed to her side. We gave in to intense, long-imagined passion, reaching climax together. But we were caught in the act by my wife, forcing me to leave the house. A year has passed since then. I ended up divorced, living a dull, flavorless existence. One evening, on my way home from work, a familiar woman suddenly called out to me.