I would suggest... Don't. Two tales.
We did ffm first and though my wife was happy with me both kinssing and doing it the other female, afterwards my performing oral on the other really got to her.
My wife and I tried this mmf with a man we knew and trusted. Or so we thought.
Though ground rules were established, including his use of a condom. It got rather out of control. Taking her from behind he began to finger her ass roughly. And then called her filthy things. Then it got scary I have to say, reallybscary. Mid penetration he withdrew, pulled off the condom and ejaculated all over my wifes vagina before quickly pushing his unprotected penis into her.
Do not bother I say