If I were to divide things up into phases:

1. Very first session: The heart-pounding initial session with a new domme, has its own unmatched excitement... tempered by the fact that you need to earn each others' trust, see if there's really chemistry, explore how to take the written description of turn-ons and limits into something fun.

2. Roughly Second through fourth session: For me, this is absolutely magical. She's still got that new domme smell, but we've gotten past first meeting jitters, earned some trust, established some chemistry, got a feel for how each other reacts, etc. I typically am conservative about first-meeting activities, but really ratchet things up in this phase. The "new domme" plus flood of new activities = really magical phase

3. Everything beyond that: We establish deeper trust, compatibility, test limits, etc. It's fantastic, and my goal is always to get into the phase, as I tend to prefer a single domme I'm devoted to, rather than variety. It's awesome, I love it... but again, phase 2 is pretty magical