I've posted circumstances of mine before, I've been PF for 10 years since I confessed to my wife of 16 years that I wanted her to sleep with another (or other) man / men. This did not go down well to begin! I assured her in the usual ways - this was just me wanting to see her enjoy other things etc, and eventually she understood but with a new child was very much not keen. We agreed that we'd see how long I could stay out of her pussy, both initially agreeing a month.
It has now been over 10 years and we gradually added CBT for me and no nudity / touching of her from me. We used to have a very active sex like and I have an 8" cock (not your usual cuck couple, huh?) but this has jsut been a huge dream of mine for so long, we both committed to doing what we were comfortable with... but my wife was always insistent that she wasn't keen on sleeping with anyone else, seeing it as a betrayal of sorts (despite my protests to the contrary!!!!).
Anyway, the months became years and before we knew it, we had a Mistress and slave relationship that we both enjoyed a lot and she had her toys and we had our version of 'fun' and got on with raising a child. Always blew my mind that we'd hit 10 years but it was easy enough to track when you've got kids. We agreed years ago that if my wife was to ever have sex again, it wouldn't be with me, but in my heart, I think I hoped more than believed.
Recently (past maybe 4 or 5 months) our dynamic seemed to change and my wife started instigating talk of 'her type' (I am younger than her by 18 months, but she's always said that ideally she'd prefer an older man). It turned out that after some poking and prodding (question wise!! :-) ) a new employee had joined her team in work (she works in an office in the legal profession) and it was pretty obvious she fancied the guy.
My wife is 41, slim, maybe you'd say skinny? But she has the most superb (and still very perky little breasts - well, they were the last time I saw them a couple of years ago

I didn't want to push this too much because over 10 years I'd finally managed to get her enjoying the role play aspect but she'd really not been keen on going further, or at least not until the daughter is older and likely moved out.
SORRY FOR THOSE WHO HATE LONG STORIES, BUT I HAD TO WAIT 10 YEARS, YOU'LL SURVIVE ANOTHER PARAGRAPH

Well, all that was completely true and something I just had to live with - until last weekend.
Due to easter and the school holidays, my daughter was away for the weekend and tbh, I was hoping for some kinky denial / teasing / caged action and had hinted as such. My wife was out with work for a meal on the Saturday due to a leaver, but otherwise it was just us two for the weekend.
Or, that's how it was SUPPOSED to go. I'd been texting through the night to see how things were going and been receiving updates but I didn't want to bother her too much. She was due to get a taxi back with a friend who lives close by around 10, but I'd not heard anything by 10:40 and wanted to check how things were. I was writing out a text to check on her when she called.
All she said was 'hi' and then 'is it OK if I go back to (we'll call him Steve!) Steve's'. I just assumed she meant a few of them, didn't really occur to me that she just meant her. I said fine and I'd wait up, no probs. What she said next honestly, I've replayed in my head about 50,000 times since! It was as simple as it gets: I probably won't be back until the morning.
Oh!
Ohhhh!
I sort of spluttered and we agreed and I went. I text her to say be safe and to text if any issues, received a 'x' in reply and that was it.
I have NEVER been so excited / nervous / sick in all my life :-). I didn't want to bother and I didn't get any texts. No pics. No updates. Nothing. Maybe in the future? But this was her stepping outside her boundaries. I just had to go with it.
She came home mid-morning on the Sunday and I was still alone. She took a long shower (during which time I was as nervous as I'd been since she gave birth!) and finally came out.
I've not got loads of details to share (she's going to have to get used to all this or be comfortable with it first and that's fine with me) but I do know that 'Steve' saw and entered parts of her that I've not seen for years. I was so jealous I could die and so unbelievably happy I could burst. Honestly, I felt like crying, I was congratulating her (I probably looked very lame) but this was the culmination of a decade's 'work' and it has finally happened.
Plans, I've been told are afoot for more and she's promised to share more info with me once she's used to it but I do know that he came inside her and MY GOD, I couldn't love her anymore.
Sorry this is so long - it's been a long time comin'!