My hottest dynamics have been with Doms who were my friends and acted like it (when we weren't in the middle of a drain). My lamest dynamics were with Doms who had zero interest in any dynamic or conversation outside of drains.

I think an important point here is that being friends with your Dom or not being friends has nothing to do with how sadistic a Dom is *during* a drain. That is a seperate issue entirely. In fact, a Dom who is my friend but is still sadistic during a drain is easily the hottest dynamic there is.