I'd suggest a proposed counteroffer:
(1) that in her mfm you would be one of the two men, and
(2) you also arrange an fmf wherein she is one of the women.
Just discussing these options might free up some of your inhibitions and help her decide whether or not she just wants to be banged by a couple of strangers or enjoy some mutual sexual adventures with you.
Yes, and then I would like to kiss her
We are already friends. so BANG whenever possible