I am not sure if this is a cuckold or cheating story, or indeed something else. Either way, it has been true for about 10 years.
It started for me as I found myself interested in the cuckold world and spent time reading stories from that genre, and this grew into a fantasy that I could persuade someone to seduce my wife without her knowing about my involvement. He would turn her into his cum slut and share all the beautiful details with me without letting on to Jane (my wife).
Jane was in her late thirties at the time, very fit with a great body from the sport she did, despite having given birth to our 2 kids, who were teenagers. I am a year older and also reasonably fit, but my work took away a lot and also reduced the time I had for sport. While I was away, I often wondered if Jane was being faithful, but I had no reason to think she was anything other than loyal to me. We got on well, but there was a bit of staleness that had crept into our relationship, as with many marriages after 15 years.
After a while, I was chatting to a guy on one of the cuckold forums, and I shared my fantasy of engineering the seduction of my wife. We exchanged quite a few messages, and Ian was keen to make my fantasy come true. I was very nervous about whether I really wanted this to happen or if it was just a fantasy. I was worried about what would happen if Jane found out or if I would risk losing her to Ian. After several weeks of sharing pictures, I decided to go ahead. Part of me thought she wouldn't give in to a seduction attempt and was keen to find out.
Ian wasn't a particularly good-looking guy - he was 5'11", average build, and about 5 years older, slightly balding. He was, however, very confident he had a way with women and could seduce Jane and unleash her uninhibited side. He sent me pictures of himself, and I wasn't threatened by him. He had a nice manner about him, we exchanged numbers and started to talk to develop a plan. I could tell he was quite a charmer. I made him promise that under no circumstances was he to let Jane know I was behind anything if it did happen. I am not sure how I could be sure, but I developed a trust in him and was getting very turned on by the idea of actually making my fantasy come true.
We agreed I would introduce Ian to Jane as a work colleague who was staying in the area on his own and see where we went from there. A couple of times, I told Jane I was meeting him for a drink, and after a while, I invited him to the house to watch some football and share a drink. As he rang the bell, I was literally shaking with nerves and excitement. I let Ian in and introduced him to Jane. OMG, what a feeling as we stood in the kitchen with the guy who was going to try to seduce my wife.
I got us all a drink and excused myself to go to the loo. I left them while I went upstairs and virtually came in my pants without having to wank at all, I was so hot. I got my cock out and immediately shot my load. I headed back downstairs, and Ian and Jane were chatting away perfectly normally. He was very friendly and charming, and I could see Jane liked him. We had agreed to go slow so as not to tip Jane off, so we retired to watch the game and left Jane in the kitchen. After a while, Ian's drink was empty. I told him to help himself in the kitchen. He jumped at the chance and headed out of the room. After about 15 minutes, he still wasn't back, so I headed for a drink myself. Jane and Ian were standing quite close together, just chatting, laughing, joking, and clearly getting on. The evening carried on like that, with Ian watching the game and him taking every chance to chat and be alone with Jane. At the end of the evening, he said his goodbyes, kissed Jane on the cheek, and left.
Jane headed up to bed and stayed up for a while, swapping texts with Ian - he was so hot for Jane and said he reckoned he could persuade her. I was so horny chatting to him about the evening, what he thought of Jane, and plotting next steps.
I invited him to the house a couple more times over the next few weeks, and each time followed a similar pattern with Jane getting more and more comfortable with Ian's company. I noticed she was being more tactile with him, but only small, subtle things, no overt flirting. I asked her what she thought of Ian, and she said she found him very interesting and funny, and very easy company.

Ian and I decided to step things up and decided a neutral venue might work better than the family home. I told Jane that Ian had invited us to dinner as a thank you for all the hospitality. Ian picked a nice, quiet, small restaurant and confirmed the date and time. I told Jane I would meet her there as I was going from work, and I suggested she get a taxi as I would drive us home.
On the night we were due to meet at 7:30 pm, at 7 pm I texted Jane to say I was running just a little late, but told her to head over and I would get there ASAP. When I arrived, about 45 minutes late, Jane was sitting opposite Ian. She was dressed in a gorgeous, quite short black dress and looked amazing. They had already managed a bottle of wine between them, and Jane was acting very giddy. She was a bit grumpy with me for being late, but was very relaxed and chatty with Ian. More wine flowed, mainly for Jane, as I was driving and Ian was being careful. They were very much getting on, and for the first time, I noticed a bit more open flirting, a bit of footsie under the table, and a lot of looking into each other's eyes and smiling. I could hardly take it - sitting at the dinner table watching Ian slowly seduce my wife.
After the start, Jane got up and walked to the toilet, a little wobbly, but she looked good. Ian winked and followed her. I was left alone for about 15-20 minutes with the waiters hovering and giving me slightly odd looks. Eventually, Jane came back a little flustered, followed shortly by Ian, who looked like the cat that got the cream! The evening progressed with lots of laughing and bonhomie. Jane seemed very happy; she had her hand on my leg and was giving me as much attention as she gave to Ian, so I wondered if anything had happened.
As the evening came to a close, we left Ian waiting for a taxi, Jane gave him a hug (lingering slightly longer than normal), and kissed his cheek. Ian shook my hand and I felt him pass me something small and damp, screwed in a ball - and he winked. I took a sly look, and I had a pair of Jane's knickers in my hand. I hurriedly stuffed them in my pocket. I went to get the car and had a good look, and there was no mistaking these were Jane's knickers and were very damp with juices. I drove around, Jane got in, and we headed home. Jane was quiet and tired. I was rock hard, wondering what had happened all the way back, thinking of my wife's bare pussy on the car seat next to me. My phone was buzzing like crazy in my pocket.
When we got home, Jane said she was heading straight to bed, kissed me on the lips, and said she'd had a fun time and we should do it again!
I got myself a beer and started to read my messages. Ian's first message was "Well, that was easy." I had about 10 messages from him describing what had happened. He followed her to the bathroom and let himself into the ladies'. Jane turned and saw him, but didn't say anything, just looked at him. He took that as an encouragement, so he stepped forward and kissed her passionately on the lips, and she responded strongly. They moved to the stall and locked the door, kissing and pouring at each other. Ian said it was Jane who said to him, "fuck me please - now." She turned around, pulled her knickers down, lifted her dress, and Ian stuffed his cock straight in her. The next message was a picture of him with his cock halfway in her pussy, with her propping herself against the toilet seat. He looked similar, maybe a little wider than me. He said they were both so hot that they only lasted 5 or 10 minutes before they both orgasmed together. He said she had told him to cum inside her. When they finished, they just quickly smoothed themselves down and headed back without saying anything. That was when Ian had grabbed her knickers as proof for me.
OMG - he had done it, she had done it. He had seduced my wife, right in front of me, and fucked her doggy style in the toilet, cumming inside her. Jane had sat back at the dinner table full of his cum, having just orgasmed in a public toilet. My fantasy didn't disappoint. I wasn't jealous or upset - I was so turned on. I went upstairs to have sex with Jane and feel her wetness, but she was fast asleep, so I was left to wank myself in the bathroom. That certainly didn't take long.
