Before I even met my wife, I knew and had had sex with my mother in law. It was never a relationship of any kind, just two horny people fucking whenever we got together. She was married at the time, but her husband was an alcoholic (He's dead now) and couldn't raise his head let alone his cock.
I'd fancied her for some time before we actually got to fuck, as she's a stunning looking older woman (forty seven now) Then at a party we chatted and she asked me about the rumor. I told her to find out for herself and ten minutes later were fucking in her mates back bedroom.
After that, we'd get together once or twice a week and fuck. There was no emotion between us, other than a sexual thing. She enjoyed my large thick cock and I loved her dirty mind and sexual habits. Practically everything was up for trial when we had sex, so it was always fun to be with her. We even had a mate of mine join us a couple of times and we both fucked her every which way.

Without knowing at all that Lucy was her daughter, I began to date her. We got along great and soon found we were not only fantastic in bed together, but also we became the very best of friends. It was about six months after first dating Lucy that I met her mother. We'd stopped having sex, mainly because she was moving between the UK and Spain after the death of her husband.
The look on her face when we met that first time, with Lucy introducing me to her was priceless. She smiled at me and didn't let on she already knew me. What she did say to Lucy right there in front of me was "You lucky girl".
Cutting the boring bit out. We dated for four years before we got married. Myself and her mother never once cheated during that time, although I will admit to tossing myself off to some of my memories of what we got upto together.
Not long after our marriage last year, Lucy asked me if her mum could move in with us for a while whilst she was having some work done on her home, to which I said of course.
With Lucy away on a training week with work, it left her mother and I alone all week. The inevitable happened and we ended up fucking. It was just as horny as before, if not more so. With my mother in law going crazy for my cock each and every time we fucked. In the week Lucy was away, I guess we fucked over thirty times. Sometimes it was full on sex, other times my mother in law had me licking then fisting her pussy and arse. By the time my wife got back home, I was totally knackered.

Out of the blue in May this year, after we'd just finished having sex, Lucy came right out and asked me if I'd ever fucked her mother. I was about to say something when she added "Don't lie to me, because we've spoken about everything". I spent the next half an hour or so relating what I've just put here, but adding more to it as she quizzed me. By the time I'd finished telling her most of what I could remember, Lucy was stroking my cock and I was ready to go again.
Inserting my cock from behind up my wife's pussy, she turned her head and said "Fuck me like you fucked my mum". The thing was, I always did and still do.
The next morning with Lucy singing away happily I asked her what happens next. I guess I'm the luckiest guy alive, because my wife said "I guess you've two horny bitches to keep happy". And that has been the case since May. Lucy often invites her mother over, or we'll visit her at her home and then Lucy will take a long hot bath. My mother in law takes total advantage of that time believe me, and when my wife reappears it's like nothing has happened. They chat about ths and that, but never mention the sex I've just had with my mother in law. However from something Lucy said recently, I now know they talk about every detail of what we get up to. And Lucy has begun to ask me to fuck her the way I often fuck her mother.