I M (58) got remarried a couple of years ago after losing my first wife in an accident. My house held too many memories so I was happy to move into my new wife's home in a new city. My wife (55) had lost her father about 6 months prior to our wedding and as a result her mother was spending a fair amount of time at our house. Typically she would come over for dinner 3 or 4 nights a week. Wife would pick her mother up from her apartment in the afternoon, I would get home from work, we would have dinner and then one of us would take her mother (Anne) home by around 7 pm. It just happened that I ended up driving Anne home most nights. Anne was 85 and was still living by herself, but no longer drove. It was about 10 minutes drive and we would have some good conversations along the way. Anne was very religious and some of the conversation would revolve around that, but a lot of it was her talking about her dearly departed husband and their life together. Just to set some background, my wife had told me that when she was a girl there was no sex education in the house. Her mother and father never talked about. A couple of times that sex did come up, it was referred to as being happy.

Okay, back to my story. When I would drop mother in law at her apartment, she would thank me, reach over and pat me on the shoulder while I sat in the car and then get out. I would make sure that she got into the lobby and I would leave. One night, as we were driving back she put her hand on my arm as we were driving and started to tell me how much she appreciated me as a son in law. A couple of nights later, soon as we pulled away from the house, she again put her hand on my arm, but this time she started to stroke my arm. She rubbed back and forth the whole way to her apartment. I have to admit that it felt very sensual and little Rob down below was starting to feel really good. On the drive home I was so conflicted. How the hell did my 85 year old MIL rubbing my arm start a reaction in my loins.

I was away for the next couple of weeks on business and when I got back, my wife told me that she was concerned for her mother as she seemingly got confused and couldn't get into her apartment lobby one night. My wife said that she had started to walk her mom right to her apartment door. So that was my job as well when I took Anne home. Great I thought. That just adds a few more minutes to my drive back and forth.

The next night I was taking Anne home and she again was telling me how much she appreciated me and was rubbing her hand up and down my arm the whole drive home. As much as I knew it was wrong, my cock just hardened as it felt really good. I don't think Anne noticed during the drive, but I think that she saw as I adjusted myself when I got out of the car to walk her to her apartment door. I got her inside and to her door and she gave me a big hug and kissed my cheek. For a couple of weeks this became the routine. One night I didn't turn my cheek quick enough and she planted a kiss right on my lips. I was shocked, but didn't say anything.

Well the next time I drove her home, she didn't rub my arm, but she did take my hand and held onto it as we walked into the apartment building. She said that she felt a bit unsteady. At the door to her apartment she thanked me for being such a great SIL and this time the hug was very tight and up close. She then reached up and kissed me right on the lips. And my gawd, it wasn't just a peck. My cock was straining in my shorts as I walked out. The conflict was raging in my head.

The following week during dinner Anne was telling my wife how her computer was frozen up and not working. She couldn't get any email and her printer seemed to be out of ink. My wife volunteered for me to look at it as when I drove her home. Well, darn it if Anne didn't start stroking my arm as soon as we pulled away from the house. I dropped her at the lobby door at her apartment, parked in visitors, and came to the lobby. She took my hand, as she felt unsteady (right), and walked to the door of the apartment. Inside, she gave me a hug and kissed me and said that she appreciated me looking at her computer. She said that she had a couple of things to do while I worked on her computer in the living room. I fixed the issue within a couple of minutes and everything was working quickly. I called out to Anne to tell her it was fixed, and she came out of her bedroom in a nightgown. Where the hell is this going I wondered.

I could see her saggy 85 year tits through the nightgown and she came right over and pressed herself up against me. She started thanking me for helping her and said that she so appreciated me. She reached up to kiss me and I thought lets just go for this. I kissed and then I went in with my tongue. She started moaning a bit and said, "oh my my". I continued to kiss her and suddenly felt her hand rubbing against the front of my pants. She asked if she did that to my manhood. I stopped and told her that yes she did that to my cock. Oh, you are a naughty boy aren;t you she said. Such bad language. I told her that she seemed to be enjoying it as her tits were starting to stand out. She giggled and again called me a naughty boy. But kiss me again she said. This time she responded with a bit of tongue. I led her back to her bedroom, pulled off her nightgown and she gasped. Oh my, is my naughty son in law going to have his way with me she asked. Do you want me to stick my cock in your pussy? Is that what you want? She again giggled and said maybe. I quickly stripped and there we both were, naked. Me with an 85 year old woman; my mother in law. She reached out and said, oh your manhood is so big. (Now I am not big at all, maybe 6" fully erect and not very girthy). She started to rub my cock and then she laid down on the bed. I reached between her legs and through the gray, thinning pubic hair, could feel a lot of moisture. Here was an 85 year old woman that definitely didn't need lube.

She pulled me in towards her and said that she needed my manhood. Being a bit mean, I pulled back and said that she had to call it my cock. Finally she asked if I would put my cock into her. Well, in I went. She was super tight even though she was wet. I had only gotten two strokes in and she started moaning, shaking, and crying out. I asked if she was okay, if I should stop and she said that she had just had a happy thing happen and to keep going. I just started stroking in and out of her while rubbing those tits on those droopy breasts. Damn if she didn't cum again. When she started to say something about happy, I said that she had cum. Use the word cum. Oh, you naughty boy she said. I am now thrusting back and forth and feeling real good. I said to Anne, "I am going to cum shortly. I know that you can't get pregnant so I am just going to fill your cunt with my baby juice". At that she came again, this time getting so red in the face. Very quickly, I started to shake and had the best cum in years. I could feel my cock just shooting all that sperm up into my mother in laws very wet and hot pussy.

I lay there on top of her for a few minutes. She kissed me, this time with lots of tongue, and thanked me for making an old lady happy. I want to do this again she said as I got up and washed up before heading out.