My mother-in-law, who had been living in the countryside, came to stay at our newlywed home for the first time. She had recently become deeply passionate about yoga, and when I saw her practicing, I was struck by an unexpectedly sensual charm. She looked youthful and carried an alluring, erotic presence. With my sex life with my wife having stalled, I found myself fantasizing about my mother-in-law and indulging in masturbation. That night, she accidentally caught me in the act. Afterward, she made me a surprising proposal—one driven by complex emotions like maternal responsibility and compassion toward me. And so, a forbidden relationship began to blossom between my stepmother and me.