I like to bust balls and do CBT on men.
Before the men get riled up...it is harmless fun and the woman can go as hard or as extreme as you/she wants.
Sounds are fun to use too cock rings pulled tight.
If you are with someone EXPERIENCED in this- the sky is the limit.
You REALLY don't want to do this with an amateur.
Pushing a sound, or pulling a dick in a vice is so much fun.
What kinds of CBT are fun for you?