Need Advice
I don't think that would be a good idea if you love your girlfriend.
What if the other guy is better then you?
I’ve done this several times, I like it but it’s very easy to destroy a relationship. Talking is a must but be very careful especially if you love this woman because your feeling could get hurt so easily.
I had a hot adventure with my wife maybe six years ago where we met with a guy I picked and she gave us both blowjobs in his motel room and we fingered and played with her.
I'd say we all had fun but I hadn't reckoned on his dick being as big as it was. I'd say he was a solid 8plus inches and pretty thick. More or less red bull can sized cock.
Wasn't the slightest challenge for my wife who's an incredible cocksucker and can deepthroat a fat ten incher. But later that night and for maybe three or four days after I was kind of bummed at being just average myself.
Now my wonderful wife always makes me feel great and is always willing to do whatever I want.
I do want to have her do some slutty cocksucking again, but I'll be certain to get a man who's more similar to myself, older, average sized, cut and a guy who will be good at verbal abuse that gets her so wet. She likes being allowed to be a slut and under the right circumstances it is great.
Also, totally agree you need to talk about it and make it something that you're both gonna love or at least not regret.
Surprises have a way of frequently going off way wrong.