So let me start by saying that this is true. I'm on a burner account and I've wanted to get this off my chest. Names have been changed which might be obvious.

So I have been married for approx 5 years to Lilly and having an affair with her mother for the best part of 4 years. It's an addiction we both can't seem to kick, so I'll tell you about how it started.

So at the time I was 25 and my MIL was 52

My MIL Michelle is quite curvy, she has big boobs and quite a nice round ass. We have always got along. Not exactly a flirty thing, but we have built a good relationship over the years and are comfortable with each other.

My wife travels for work a fair bit and Michelle always bobs in and out of the house when my wife is and isn't there.

Over the years as I said we have gotten comfortable with each other and have alluded to sexual history, which I always playfully teased her with as she always alluded to never having anything but vanilla sex, and well my taste is a bit more wild, not that I ever stated specifics but me and her daughter have quite a few kinky toys that we incorporate into the bedroom.

Well one day when she came over for tea, we were just chatting and had a few drinks with our take out when she nipped to the toilet, but I hadn't realised that some of my wife's sex toys hadn't been put away and we're on the side in the bathroom.

So when Michelle comes back she looks sheepishly at me and makes some comments about "not knowing I had a dog" didn't get what she meant but my wife's sex collar and leash had been left on the side.

Eventually when I realised what she was getting at. I apologised and tried making some excuses for them, but she kept getting a little red and teasing about it, until I told her that it was her daughter's collar for the bedroom.

I thought I may have stepped over a line, but she looked strangely intrigued and pressed me for what exactly we do with it.

I told her a little too freely about the kinky things we do, after which Michelle excused herself and rushed away.

I thought I had gone too far and was working on an apology and what I would say, when I was suddenly called into the other room by Michelle.

When I got up and looked she was in her underwear with the collar on and was red in the face and offered me the leash to hold onto.

We were both somewhat drunk by this point and told her, that she should get on all fours if she was serious, and she did instantly.

We proceeded to use the living room as our base camp for the night and had sex a number of times.

She was so enthusiastic and tried to keep her moaning to a minimum, and I took great pleasure in getting her to break her silence with loud moans. The only time I tried to silence her was when I was close to cumming and I would choke her with the collar and leash, which seemed to give her extreme pleasure.

She explained to me afterwards that her own sex live was so very vanilla and that her husband barely touched her anymore, and they would only do it missionary and never branch out or even experiment with kinks. When she had found the collar and leash it had turned her on, and when she had rushed off to the toilet she had actually masturbated thinking of it being used on her, and in her drunken state she then put it on, wanting more she dared to come out with it on to see my reaction.

She stayed over that night like she had done so many times before. However this time she was being filled in by me.

Since then after we had sobered up we decided that it was going to be a one time thing. However that didn't last long at all. About half a day. I have since opened the doors for her kinky side and she is very enthusiastic about exploring her kinks with me. We've agreed to rules, and only indulge in our affair when my wife is out of town, and both agree that it is just sex. We aren't in love, it's just I have opened sexual doors for her she never thought she would get to try such as bondage, anal, tit fucking and CNC.

If anyone would like to hear more then let me know and I'll add some more of our sex stories as there are a fair few.