One day, my mother-in-law suddenly came to Tokyo while I was living with my wife. Apparently, she was scouted to become an underwear model and wanted to take on the challenge, so she ran away from her parents' home. My wife and I decided to have my mother-in-law stay at our house for a week to cool off. That night, on my way to the bathroom, I heard a noise coming from my mother-in-law's room. Thinking something, I looked into the room and saw my mother-in-law wearing lingerie. I couldn't take my eyes off my mother-in-law's bewitching expression and her underwear, which I don't normally see.