Does the expectation of the subs differ, depending on what session they have asked for and/or the session type you are doing? It is that more of them "expect" with a tease session, humiliation or GS, and less expect if being caned or other things?

One mistress I know in this city routinely includes tease-and-denial into most of her sessions, with real or predictable "accidental" results . . . a sub, to not have that included, would have to ask or specify a different type of session that he or she intends to take up the whole time.

She may or may not use the situation against the guy, depending on her mood and how well she knows him.