You're right geecrizz. We'd discussed Debbie cuckolding me (though I wasn't aware of the term back then) for a good 2 years before anything happened, from me first suggesting it, then encouraging her, persuading her, but also re-assuring her that I would still love her come what may and wasn't looking for an excuse to fuck other women. The build-up to her encounter with Chris, a 23 year old regular customer at the shop she worked in, was exciting and I remember taking her out for dinner on her 35th birthday and all we spoke about was the date she'd arranged for the following evening.
She met him after work for dr1nks, then went back to his place where she was soon naked in his bed and fucked eagerly 3 times. When she got home it was amazing having her tell me all about her evening and her plans to carry on seeing him for sex, a toyboy "bit on the side", a role he said he was more than willing to take on and I was equally keen for it to continue. A couple of days later though, the angst and insecurity hit me and hit me hard. We'd agreed beforehand that if either of us weren't happy with the situation, then it stopped and I asked Debbie not to see him again. Coupled to the fact that Chris hadn't contacted her since, this caused us to have a few quiet days with Debbie feeling dirty, used and that she'd been too easy a lay. I lavished love and attention on her and re-assured her that no harm had been done. I wanted her fucked by another man, she'd confessed to wanting to try a much younger guy and he'd wanted some mature, married pussy, so we were all winners at the end of the day. But, as said above, once she's been fucked by someone else, you can't ever change that.
Hindsight is a wonderful thing and in retrospect I wish I had held my nerve and let Debbie carry on seeing Chris and let things take their course. Another aspect you have to consider is the feelings and emotions of the other guy. You can talk and talk about how you expect things to work out, discuss various scenarios, but the other guy may have a different agenda. He may just want a one-night-stand and not even try to get your wife into bed again or he may be totally smitten and want her more and more.
Peter C