I haven't set up exactly this scenario, but I think it's perfectly possible to do with relative safety.
The main thing is to be confident that your partner knows her safe words and uses them, instead of just "accepting" things when it could be "awkward" to safe-word (or, just freezes up). It's also important to be able to recognise when there's something wrong, which just takes time and attentiveness.
I would recommend some "normal" gangbangs, time at a club, etc, so you can both build trust and experience - and I do mean both, you need to feel confident and comfortable too, not just trying to "live up to" her fantasies (and it's okay to say that, it takes time to learn someone such that you can take on riskier play with more confidence).
With all that said, if she is literally saying "I want you to surprise me with a gangbang" (not dirty talk, not fantasy talk - a sober, in all senses of the word, request), you don't need to treat her with kid gloves - especially if you're already in a place where you can trust her to use her safe-words and you can recognise when there's something wrong.
Only other piece of advice I'd give is that you're always better off disappointed than traumatised 😅 there's always next time, so agree between yourselves - if you haven't already - that both of you can call something off at any moment, and you'll support each other in that decision with no hesitation or equivocation. That means you, too - think one guy is starting to get a bit shady, but can't place anything specific? Call it off, shut it down, arrange one again next week.
Anyway, that was a long way of saying - stay relatively safe and have fun! |
. What kind of man would agree to even consider doing that? 
