You posted to Boston, too, in advance of traveling there. No one can answer how YOU will respond to the experience.  
.
For me, it feels OK but I don't like it. I don't want to be kissing and DFKing the same mouth that has been licking my ass. If I sense the action going in that direction, I actually ask my hostess not to do it.
.
If rimming is new to you, I have a different recommendation. Instead of making it the raison d'etre of your selection, why not search TER Reviews for ALL of the things you are looking for -- age, hair color, MSOG, -- and include rimming (one of the data fields in the searchable database) in your criteria.  
.
That way, if you are disappointed with the rimming experience, you still have everything else going for you.