When I met my mother-in-law, she was fifty and I was thirty. I am attracted to my wife and love her, but I've always fantasized about her mom. Over the first ten years, we grew to be good friends. She would always greet me with a nice warm hug and kiss on the cheek. About five years ago, I decided to see how she would respond if I got a little friendlier. As we greeted each other and no one was around, she gave me the hug and light kiss. I continued talking with her but kept my arms around her. I slid my hand down her back and rubbed her firm butt. She seemed okay with it, but it still seemed kind of innocent. As we were leaving from that visit, I made sure my family and her husband were not around. I told her we would be leaving and went to give her a hug. She leaned into me and began kissing me with her mouth wide open. We made out for several minutes before we heard the kids coming. The next trip was very interesting. She was bent over looking over the dinner in the oven. I came up behind her and began stroking her butt. She just froze and let me rub her. We continued this 'innocent' petting and kissing on each trip, while all the time acting as if it would never amount to more. One time as I was driving through her town, I called and asked if I could stop by. She said yes. She greeted me at the door with a passionate kiss. We made out for about ten minutes just inside the door. She pulled me into the bedroom where we made love all afternoon. Unfortunately, since then our relationship is very strained. I think the guilt is too much for her. We now greet each other with uncomfortable hugs.