ERDM-181 "Just this once, promise me..." I did it with my wife's mother who is over fifty... Forbidden relationship for four hours

My wife went into labor and was hospitalized, so my mother-in-law came from far away to help with the housework. Honestly, she has a better figure and more sex appeal than both my mom and my wife, and I can't help but stare at her. No matter how you look at her, she doesn't seem to have passed fifty. Even though I know it's wrong to get aroused by my mother-in-law, I take advantage of the fact that my wife isn't home and invite her over...