One day, my mother-in-law came to Tokyo to live with my wife and I. She had been invited by an acquaintance to be an underwear model, and she had decided to take a big decision. To appease my mother-in-law, my wife and I decided to let her stay at our house for a week. That night, unable to sleep, I headed to the bathroom and discovered light coming from my mother-in-law's room. It seemed she hadn't given up yet, and she was wearing seductive, sexy underwear. I was captivated by my mother-in-law and naturally reached for her crotch...