Cape Town conundrum - Capetonians HELP - OR ANYONE

Hey Hey all the KaapStad Mense,

Right listen i am in kak street basically,

So there is this couple who i have joined on and off for the last few months for MFM threesomes,
The wife recently said she has a big favour to ask me as it is her hubbies fantasy, so i said yes i am all ears,
this is what they want to do .....

We would start off doing our normal threesome taking turns fucking her and doing WHAT we all like THEN ......

HUBBY WANTS TO RIDE MY COCK = this is it in her words

hubby want to sit on your cock cow girl style and ride you the he will lean back so that he is laying flat on his back on your legs, i will then suck his cock and then mount him, but i will be facing you so that i can kiss you as you fuck his ass and he fucks my pussy ..... what do you think can we do it that way ?

here is my dilemma i have never done a guy before !!

please people tell me what to do, i dont want to ruin this for any of us, those of you who have experience in this please give me some tips.