I'll start and put My response in a comment so as not to distract from the question.

I've had a handful of sessions which I would call peak experiences and in which I sustained Domspace for most of the session. I felt totally in sync with the person I was with and it felt like a Zen moment.

One was a roleplay which spontaneously evolved into something I had not intended. I started with one idea and suddenly one sentence brought Me in a different direction. I went with it, really let Myself become My character (I usually do for roleplays but this one especially clicked) and My creativity just flowed. It turned out to be one of My favorite scenes ever. It greatly helped that My play partner took to it like a fish to water and followed My lead perfectly. Part of the scene which I remember was an extended spanking which was not planned and left My sub looking very disoriented and drunk. Wow. So fulfilling.

Another was a beatdown which could have been less exciting if My play partner did not commit to it on the same level I did. Feeling his commitment allowed Me to not have to try to spend energy "convincing" him. He became like putty in My hands and I really felt like, by his energy, he was almost giving Me permission to do anything. Something about that was liberating and inspiring. Again, I flowed from one moment to the next without thinking. Super intense and gratifying.