I Just Can't Stop

I'm stuck in a good-bad situation. I've been married to my HS sweetheart for 10 years. We don't have any kids the wife can't bear children. We are cool with that. Neither of us really want them anyhow. We are both career minded and work a lot toward being the best etc... My wife is an advertising executive for a pretty big company. I have my own business that I started with my life savings about 5 years ago. It's very profitable and I've got it down to where I don't have to work 12 hour days 7 days a week. I have freedom and spend more time taking clients golfing than actually working.
My wife's mother is a very attractive woman. I always thought she was hot, like her daughter. They do look a lot alike. She's a natural redhead just like my wife and is very thin with small tits but long legs that go up to her awesome ass.

Needless to say after ten years of marriage and having only had sex with each other since we were 16 we don't have sex as often as we'd like and even when we do it can be fairly routine. Occasionally we get our juices flowing and knock out a few good rounds especially when she's been gone all week on business trips.
My father in law died a couple years ago from cancer and my mother in law moved in with us about a year later in the middle of COVID-19. I didn't mind because we have a huge house that has 4 bedrooms, two on one side of the house and two on the other side. I figured it would be fine I wouldn't lose my privacy and she's really cool. She likes to cook and cleans the house even though we never asked her to or expected it. I spend more time with her than my wife by a long shot. We started watching Netflix series Stranger things together and found ourselves snuggling on the couch eventually. I could tell or at least felt that we were getting closer to each other emotionally and one day she said to me... I hate to even go down this road, but I have to get it out. It's been over a year since Paul passed and I've not had sex for a lot longer than that. I said wow I never thought about that. I'm sure a beautiful woman like you would have no problem finding a suitable man. She said Bradley I really don't want to go out into the dating world especially now with this pandemic going on. Do you really think I'm beautiful? Yes of course I always thought you were Marion. Ever since I started dating Molly. She laughed and said she thought so and had caught me looking at her inappropriately many times. We both laughed. Then she said would you please fuck me? I know you're a good husband to my daughter and she'll never know. I was instantly hard. I had to think about it or made it look like I was. I said are you sure? I've not been with anyone but Molly since highschool. She said it's ok she understood and please don't say anything to Molly thinking I wouldn't do it. But I kissed her right then. A soft but passionate deep kiss that lasted quite a while. It startled her at first but immediately reciprocatef. I hadn't had sex in weeks and wanted her as much as she wanted me.

We tore our clothes off and were kissing groping and rubbing everything. She has beautiful tits - B cups with huge pink nipples that stick out a half an inch and are as big around as dimes with nice pink areolas. She must have been planning this a while because her pussy was shaved except for a small triangle above her beautiful pink pussy. I sucked on those nipples and fingered her sopping wet pussy and rubbed her very hard and pronounced clit. I had to eat her. I went down and just started devouring her. She was so wet and came over and over flooding my hungry mouth with her juices. We fucked all that night and into the morning in her bed.

Since that day we fuck every day my wife is out of town or is going to be out long enough for us to fuck.
She says she loves me and as long as we let her stay I can have her all I want any way I want. She won't interfere with our marriage and Molly will never know. The thing is I think I love her too. I know I love the sex. She's the first and only woman I ever fucked in the ass - her favorite and she'll suck me whenever I want or whenever she just needs to. She is an awesome cocksucker - something my wife hardly ever has done and never more than a couple minutes. Yeah I know sex and love aren't the same thing. But I just love being with her to be honest. Yeah she's 56 and I'm 34. But we click. We like the same foods, and movies etc... She loves to make me happy. And I love to make her happy.

The wife says she's so glad that we get along. She doesn't want her mom living alone. And thinks I'm the best husband on earth for making her mom feel so welcome and at home.

I'm dealing with a ton of guilt honestly. But as soon as Marion kisses me it fades away. I can't stop. I won't even try. If it came down to choosing one over the other... Yeah you know who I'd pick.