Girlfriend fantasy

I've always fantasised about the person I care about having some sort of sexual encounter with someone else. At 48, I'm in a stable relationship after a divorce 10 years ago and extremely happy. When my g/f and I have a rare night off together we get drunk and always end up watching porn, her choice as much as mine. Sometimes she looks at women and wants to touch and suck them, sometimes she looks at men and wants the same. I've often told her about my wish to see her show her breasts to another guy. I'd like to be out in a bar and get talking to another guy and be getting on with him. I'd suggest going to the toilet to have a talk together and after we'd done that but still in the cubicle, I'd feel her breasts and pull her top up and offer her nipples to him. I'd like to see her get turned on by him getting hard and see her rub him. Then I'd like to see her make him cum over her and see her rub his sperm into her nipples.

In another fantasy, we'd be back home having a drink after being out and have a guy we'd met having a late drink with us. My wife would be laying back on the sofa and when the guy went to the toilet, I'd say to her, 'we'd both like to have sex with you'. She'd act surprised but say, 'really?'. I'd tell her to go to the toilet and then I'd enthuse about my wife and ask the guy if he found her as attractive as I did. Since she's very fit and sexy, he'd clearly want her. Then when she got back, I'd stroke her gently on her tits which always gets her turned on. Then after a few minutes, I'd pull her top down and show her breasts to him. The moment when he touched them would be amazing. ME and the guy could then get our cocks out, both with an erection and she could rub us together. TO see him cum over her tits would be the final fantasy.

I think the guy cumming on her would be relatively harmless but still very erotic.