Imitating a porn scene

A married couple whose father-in-law passed away and decided to live in his wife's parents' house. However, I couldn't get excited about my wife because I lived with my mother-in-law who was too beautiful. I had an invitation from my wife again today, but I turned it down. My mother-in-law was cleaning as usual. I was staring at such a mother-in-law, repeating the delusion of tampering with her mother-in-law. One day, my wife went out and was alone. My mother-in-law was taking a nap and was defenseless. I can't stand it anymore and caress my sleeping mother-in-law's body...