The negotiation or consultation time before a session is when you lay out what your expectations are. You will be speaking with a mistress, master, or play partner. Of vital importance is that you are both on the same wavelength.
You should never assume anything. Assumptions are the first step to disappointment.
Words Matter
Do you want a beating or a caning? They are different words and have different connotations the mistress may interpret differently to you.
I hate the word ‘beating’ as it avoids my fetist for belts and straps. I ask for a strapping. Lots of strapping. The mistress knows where my fetish really is.
What About Play Other Than Corporal
The same rules apply.
I like bondage but with belts and straps. I never ask to be tied up. That can involve rope and chain. Neither of these work for me.
I ask to be strapped up in bondage. To be strapped down to the bench (not tied with rope of course). That sort of thing.
So I am careful to use the right words.
For you, what is your fetish, what is your desire? Make sure you use the words that highlight it, make it plain.
Dealing With A Happy Ending
This has never been an issue for me, but I know mistresses who have complained bitterly that a client only mentions tis at the end of the session.
Most mistresses don’t offer sex. Hand relief however is often available. Also mistress may offer other services via other staff. If you want sex then maybe a service provider is available for that.
So, when you are setting up a pro dom session, make sure you are explicet and have no ambiguity.
Asking for a happy ending is not a very specific request. I am sure all the mistresses I have seen would query you and ask for more information.
Words Matter!