Changing Positions

My favourite position at the moment is lay under my wife in a sixty nine, as she sucks my cock.
Thrusting into her pussy then her arsehole and back again from behind as I stare up at his balls slapping into my wife and occasional my face, is her lover Andy who has a much larger cock than mine.
Every now and then he'll slide out of my wifes holes and press his cock downwards, giving me the opportunity to suck his beautiful erection.
Once Andy's ready to cum, he'll make sure he's fucking my wife deep, then when he's emptied his balls, it's my turn to pleasure my wife as I suck out Andy's cum, often making my wife orgasm all over my face.
Another position we occasionally perform, is Andy fucking my wife missionary in long slow thrusts as I bury my face between his arse cheeks and tongue his arsehole.
There's a position my wife wants me to try, but I'm not sure I'm ready to try it just yet. And that's me fucking my wife as Andy fucks me.
I know Andy's up for it ( Pardon the pun) as he's openly bisexual, but licking and sucking his cock is as far as I've gone with a guy so far.