My wife's mother is beautiful and charming even with her age. She was asked to do some work as an underwear model, and she came to Tokyo with excitement and decided to stay at our house. Although I knew it was wrong, I sneaked into my mother-in-law's room in the middle of the night and found her practicing posing in her underwear in front of the mirror. I couldn't control my male feelings in front of her fair skin and seductive lingerie, and my desires ran wild and I ended up cumming inside her! For several days after that, I spent my days drowning in sexual desire.