My T does not use terms of endearment, and I would not like it if she did. To me, it would feel patronizing or belittling. The power dynamic is already so skewed... if my T called my things like "sweetie" or "hon" or anything like that, it would feel like she was talking down to me, like she was taking advantage of her position of power.

That said, she doesn't use nicknames for me... it might be weird if she did, but I wouldn't mind it. That, to me, is endearment -- to be close enough with someone to use a nickname.