Have the sub count down to their own orgasm, rather than you doing it for them. You'll have amazing results - I promise, and there are so many opportunities for praise, encouragement, humiliation, punishment, or straight up denial.

When your sub inevitably slips up and skips a number...

• "Oh, you wanted to do such a good job for me that you forgot a number. That's so cute! You're such an obedient girl..."
• "What a stupid cum-dump you are! You don't even know how to count down from 10... I'm not sure what I expected though, I can clearly see you losing brain cells even as we speak."
• "You're such a greedy little slut that you got in a hurry and forgot a number. Remember what I told you about not getting ahead of yourself? I guess I'll have to remind you with a few red marks on your ass."
  

Or interrupting before they get to 1...

• "Wait I didn't hear you properly, I guess you're gonna have to start back at 10"
• "You know what, I've changed my mind, I think you need to count from 20 instead HaHAhaHA"

You're welcome. 😋