Most ladies will offer it depending on time left and the readeness of you.  You  might inquire before you meet, or at  the start of the session.

Normally, if she likes you, she'll offer.

I've known providers that if you asked for coffee, they really would give you a cup of coffee...

Unless you are there for something other than servcces, that won't be the first sexual term you have used in the session, just be upfront and let them know that you like to both please and be pleased more than once.

If a lady can be multi-orgasmic, it should also be okay for the man to be, especially if he really tries to please her too, and THAT is the key to having a nice time in this hobby.  Try to make sure she has a better time than you do, and she'll usually take care of you in return.