A few years after I got married to my wife, my mother-in-law, Shoko, suddenly came to visit from her parents' house. Apparently she had been scouted to be an underwear model and had run away from home after a fight with my father-in-law. We decided to let her stay at our house for a week to calm her down. That night, unable to sleep, I headed to the bathroom, but I was curious to see my mother-in-law's room with the light leaking out, so I peeked in. Behind the door was my seductive mother-in-law clad in lingerie. I couldn't take my eyes off her seductive expression and lustful body, which she had never shown to me before...