At the house where I live with my wife, my stepmother came to visit from out of town. She had apparently received an offer to become a panty model from an acquaintance and decided to come to Tokyo. My wife and I agreed to let her stay at our place, and that evening we spent time together as a family. But late at night, as I headed to the bathroom, I noticed light spilling from my stepmother's room. She hadn't given up yet, wearing alluring and sexy lingerie. Mesmerized by her figure, my hand instinctively moved toward my crotch. That night marked the beginning of a new relationship with my stepmother.