Hello all, looking for advice on swinging as its new to me, but my girlfriend has always been into it!

I, 30M and my girlfriend, 30F are a very sexual couple and of course, fantasies and dirty talk come out when we're having intimate time and her fantasies and scenarios always revolve around her wanting to either do it next to another couple while we're all doing it, or have me with another woman and her with another man in the same scenario, or threesomes.

She has never 100% been with another woman but is extremely into women, and has been since we got together 10 years ago. I wonder if the fantasies may not play out the same way if they were to happen in real life and things could change between us.

What can I expect if something like this were to actually happen? Comments and suggestions greatly welcomed. Thank you!