Well it all happened a while ago - about 16 years ago when my (now ex) wife was 26. For a while she had been moaning about being unattractive, this continued no matter how I tried to re-assure her. I asked did she not see the other men eyeing her up? She did not believe they found her attractive.
When we were making love I'd complement her on her body saying how lucky I was and how other guys would love to be touching, kissing and doing all the things I was doing to her, again she doubted it, so I'd mention a number of guys we both knew as friends and colleges and how I knew they made admiring glances and would love to have her. Over time this advanced to Role play and seemed to help our sex lives as I would talk whilst we had sex about how one of our acquaintances would love to be doing what I was doing, describing how they would be exploring and enjoying her. This had been going on regularly for over 6 months.
Now to cut a very long story a bit shorter, I'd gone back to the city hundreds of miles away, where we used to live and when there had met and invited a mutual friend to travel back with me to visit my new work place and to stay with us in our new home for a few days and use it as a base to visit London as an inexpensive holiday for him. During the 8 hour drive back home together, we had got talking and he mentioned about a MFM threesome he had been lucky enough to enjoy. It sounded really hot and I mentioned that I'd love to try that one day with my wife, but doubted that she would ever go for that as she felt so bad enough about her image that would not consider that anyone could be remotely interested in her. He was incredulous that she could think that and quick to agree with me that she is hot and added that given a chance he would love to get with her and give her a good fucking. To which I chortled and said I doubt you'd get the chance, but I'd love it to happen and we left the conversation there.
We eventually arrived and after eating all spent a pleasant evening exchanging stories. My friend (I'll call him Ken here) was shown to the guest room and we all went to bed. After my time away my wife and I were soon getting it on and as usual I was telling her how our guest was enjoying eyeing her up. Once more she doubted me. I told her that he had been complimentary, how he had said he thought she was hot and how I thought he would love to get his hands on her - like this - as we once more role played. With me asking her to imagine it was Ken's hands on her and his mouth suckling her nice firm breasts, she responded well but said she did not think anyone would want to touch her, I followed on ensuring her he would love to and had said as much when we had been chatting - again she denied it would be true.
Now things turned up a notch as I said to her “I'll tie you here and let him come and run his hands over you” - she laughed and I took that as assent to play further.
5 minutes later, two bathrobe towling belts and number of old neck ties tied together as hastily improvised restraints and she was tied spread-eagled, face up to the bed. The role playing continued, I was telling her how it could now be Ken feeling her all over as I played the part, acting as if I was having my first encounter with her. (Now if I had thought it through I should have added a blindfold, but I didn't)
She was getting very turned on by all this as I pretended to be Ken. So I started teasing saying now you are tied like that there is nothing you can do, I could go get him and have him come join in. She part laughed part groaned saying you can't do that (no anger or "don't you dare" or “let me out now”). I teased more and feigned going out the bedroom door a couple of times, more playful than serious, but also testing. Coming back, doing a little bit more of the role play.
Enjoying having her restrained (the belts and ties were not merely symbolic, I knew my knots she could strain against them and they would hold) I would climb onto her, feel her all over, trail my mouth down her body as she squirmed against the ties, then slip my dick into her very wet pussy and enjoy just being there but doing nothing else, then pulling out and pretend to go get ken, actually opening the bedroom door and stepping out for a second or two before returning and doing it all again.
I was surprised and inwardly smiling that she was not freaking out when I played the game of going out to get Ken. Each time going a bit further and building it up and saying I was actually going to do it unless she demanded me not to. I needed to nip to the toilet which was right by the guest room and told her so, suggesting whilst I was there I'd bring him back. I moved to the door again - I did not get an explicit NO, but she did say "don't go waking him up"
I do not think she thought I'd actually do it, I think she was expecting this to be a further extension of the game we'd been playing and that I'd go to the toilet and pretend to come back with him. So I left the bedroom and took a few steps then returned, looked at her tied there spread eagled and completely exposed and told her "I'm going to do it" she tried to raise her head up as far as she could from the bed, "don't you wake him" she hissed at me in an almost threatening way. "I won't wake him, if he is awake I'll invite him" I responded and with a huff of exasperation she flopped resignedly back down, possibly getting weary of this on going charade.
After a quick pee stop, I woke Ken in the guest room and asked him to come join us in the bedroom, then headed back to out bedroom.
Stepping into the bedroom I stood for a second admiring her and drinking in the sight that I knew Ken was also about to enjoy, then got onto the bed beside her. I had a quick suck on one of my wife's nipples before moving up and kissing her hard on the lips as I ran my hands over her. When I broke the kiss I turned my head and there was Ken, bleary eyed at the foot of the bed by the door, contemplating what lay before him as he stood there in just his tracksuit bottoms. My wife let out a little “oh no” and looked to the ceiling, I leant back in and kissed her again and during that kiss felt a jolt that indicated that Ken had not run away, but that she had felt his hand touch her. I moved my mouth down and took her right nipple back into my mouth as I lay at her side giving Ken good access to her body. I felt the bed move slightly as he climbed onto the bed with us, his hands snaking up her body as she lay spread-eagled beneath him. Cupping her other breast, then moving up to join me as we both sucked on a nipple each. I looked up, she was gasping slightly, but not looking at us or saying anything. I moved out a little and Ken cupped the now vacated breast and took a taste of it too, whilst pushing down his tracksuit bottoms with his right hand as he lay between her legs. She had her head arched back, eyes open, breathing heavily as I took her hand. He took a look at her and pushed forward, my wife’s head jerked a bit and whilst I could not see, I knew from the reaction he had just entered her. He kissed her neck and few gentle yet self indulgent strokes later he asks her softly "are you ok with this?" (nicely done, he had enjoyed having her before risking the question - not that there was much she could do or say now his dick was already deep in her – she had already been taken - but this was asking for permission to continue) she nods almost imperceptibly, but certainly not saying no. So Ken takes that as a yes and starts to fuck her with slow, strong measured strokes at first before building up the pace. I lean in and kiss her hard again, feeling her respond and react to the good solid strokes Ken is now giving her. I love the reaction from her as I squeeze her hand and partly embrace her, feeling him fuck her as we kiss. I step back to enjoy the sight and to give Ken some space, he is clearly enjoying fucking my wife and she seems to have accepted it and is enjoying too. She tries to move her hands but is still restrained, he spots this and unties one wrist and together they release her other wrist and embrace as they continue to fuck passionately together until he comes deep in her.
I took a turn after that, she felt wonderful, I had never experienced her so turned on as Ken and I made her that night. We took turns fucking during the rest of the night, and it all went very well with the only brief off moment being when we tried DP, she did not like anal - in retrospect we should perhaps have tried DV that would have been more feasible (having seen the large toys she later played with) and real extra joy for her.
Since then I have always enjoyed 3 somes both as part of a host couple and also joining other couples. Whilst I enjoyed sharing her and watching or hearing her fuck others I would not consider my self cuckold, more a lucky man with a hot wife who liked to share good things!
Sorry this is so long, I've wanted to share this tale for a while but only now have got it down, I'll have to go through and edit it into a more readable form and repost.