It's been a year since my wife, my stepmother, and I started living together after my father-in-law passed away. Today, my stepmother suddenly said she wanted to be an underwear model. Apparently, she had applied without telling us, and when my wife found out after she was accepted, she firmly opposed it and ended the discussion. I was confused, but that night I happened to see my stepmother in lingerie through a gap in the room. I was immediately captivated by my stepmother's expression and posture, which I had never seen before…