With my reg who is really into that type of play. I bind her arms to her body, blindfold her, insert commerical grade earplugs, industrial strength ear muffs and a ball-gag. After a few minutes of isolation and random acts of pleasure and pain she panics and realese a "safety ball" to signal me to stop. What happens in 10-20 minutes feels like hours in her mind? She'll have a sub-space expirance and not be fully coherent for a few minutes.
Afterwards we'll have a good hard/ rough fucking session
the cool thing about this is she likes it very much and offers me a very steep discount and 1-1/2 session sometimes 2hrs. It's a very interesting style of play for me
To me it's like artwork, just the endless possibility of play, the use of imagination and pushing boundaries.