Wife’s birthday present [FFM] + [MFM]

Apologies if this is a little long and rambling. I’m not much of a writer.

I organized a foursome [MFMF] for my wife’s 38th birthday.
We’re not swingers or in the life exactly, but we have had some 3 way [FFM] experiences.
Up to this point, we had used the multiple partner fantasy as a turn-on while in bed. There are times where she gets so insatiable that she says she would let me do anything to her, and I do. Sometimes I ask her, “How would you feel if another man walked in here right now, would you want him to fuck you?”. Yes was always her answer.
While a lot of this is fantasy talk, I also got the impression that she was as turned on and serious about it as I was. In the past, she’s loved kissing women and having her pussy licked and finger fucked which I always loved. I love seeing her being pleasured. Especially when her head tilts back and eyes close as they rollback. You know she’s feeling it all at that moment.