My therapist has never used any terms of endearment with me. And come to think of it I don't he's ever said my name during my session.
However, adhering to boundaries prevents me from calling him any form of term of endearment. There is a slew of stockpiled names (endearments) that I would love to say to him during our session!
Outside of therapy, I have oodles of terms of endearments/nicknames for people and animals. I kind of like naming things!
Bunny (my nickname)