Years after the death of my father-in-law, I learned that Kogiku, my late father-in-law's wife who lived in the countryside, would be coming to Tokyo again after a long time. Kogiku was still in her forties, with a plump, soft body and fair skin. Ever since our marriage meeting, I'd secretly been attracted to her. Although my wife was cute and we had children, I had always suppressed my feelings. But when I heard Kogiku would be staying overnight at our home, I became incredibly excited, unable to sleep as I kept imagining seeing her again. My wife wasn't particularly interested in sex, while Kogiku seemed to want a second child. One day, I saw her underwear lined up in the laundry basket, and my self-control vanished—I couldn't help but sniff them. In that instant, my cock painfully hardened, and I started jerking off wildly, only to be caught by Kogiku herself. She left me with a stern "just this once," but that only intensified my desperate desire to have sex with her. What will become of our relationship from here? A gripping story unfolds, drawing the viewer in.