A week of being invited by the shiny body of my stepmother who aspires to become a lingerie model...and drowning over and over again as instinct

A few years after I married my wife, my stepmother Shoko suddenly came to visit me from my wife's parents' house. Apparently she was scouted by an underwear model and after a fight with her father-in-law, she ran out of the house. To calm my mother-in-law, we decided to stay at our house for just a week. That night, I couldn't sleep and headed to the bathroom, and I was worried about my stepmother's room, where the lights leaked out, so I peeked. Then, behind the door was my seductive stepmother wearing lingerie. I can't take my eyes off the shiny expressions and lewd body that I've never shown before...