Interesting question, thanks for posting it.

I like a little bit of chatter before the session starts. I am always a little stressed when I first arrive at the session and having a few minutes to relax and decompress enables me to just slide much easier into subspace. Doesn't have to be a lot of time spent in talking before the session, just a few minutes to help me relax and start to focus on what's to come.

Once the session starts I don't need chatter, but if the domme feels like talking that's fine with me. I do enjoy some verbal encouragement during the session, sort of like Domme cheerleading. Things like, "you slut, you know you can take more for me." A little bit of that goes a long way for me and can make a session even more special.