... asking for a friend ☺.  Trying to make a new friend and getting *some* mileage out of Spanish/English translation sites, but I don't know if "arriba" or "versátil" are the appropriate terms in our context.
I think that "activa/activo" and "pasiva/pasivo" are common?  So would "Tu activa -  Yo pasivo" get the basic sense of "Please fuck me with that big beautiful cock" across?
Thanks!