I've never had any partner client or otherwise ask to be called Daddy!I do have a client that calls me Mummy though and I do find it rather yacky but he is a quick and easy client and I just ignore it for the 20 mins he is with me.
I wouldn't immediately drop this client but would maybe explain to him that you don't like calling him daddy.Anything that goes on in a booking is totally your choice so whether it is common or not it doesn't really matter.

Maybe he didn't mean it in a pedophile type of manner.  I have had clients want me to call them " big daddy " while having sex.

"daddy" or daddie is also a urban street word that some women use for their significant other instead of baby or sweetheart " yeah daddie", big poppa, "fuck me harder big daddy " , "ok poppy or daddy" .  ... ...seen it used in alot of Latin and ebony porn.   Maybe he saw it in a porno too...... loool. 

including him eating it.

I have no doubt that he was and is a very clean person

and he booked to "report" what he did with another escort?  Regs do kill me, they really do!! Roll on touring!!!! 

I understand why it bothers some people and it did give me the creeps UNTIL I realized that I myself have said "now be a good boy and turn over" to some clients who get off being spoken to that way.  Never once did I think of them as a child and I have no desire to be with children

Because of that I'd be a hypocrite if I assumed everyone who enjoyed the word "daddy" had incest fantasies about children.

In the end I think we each have to do what we are comfortable with and if it bothers you that much then it's not worth keeping him as a client.

Hugs,
Mandy

thanks everyone I do feel a bit better about it reading some of the points on here. Its just that there is a significant age gap for him to actually be my father which I suppose stems the awkwardness. he hasn't rebooked yet but that gives me time to maybe consider what to do