I often lust after my mom-in-law since I have seen her in a thin gown with no bra on underneath while I was wearing wind pants with nothing on under them. I got very hard and she just looked at my crotch smiled and went back to what she was doing. My wife was in the next room so I couldn’t just make a move to see how she would respond. We haven’t been alone since, but I often fantasize about s** with her, especially since she has been separated and lived alone for several years.