When I first saw my last T I knew there was something good going on after my second session. I wouldn't call it attachment per se, but it was a sense that I would be able to trust her slowly. I could see where it was going instead of being unsure if it was going to work out. That ended up being the best stretch of T for me so far. As for my current T who I have been seeing for two months I know that I can trust her, but doing it is a whole 'nother thing. As I hardly ever trust anyone, each time it is a process to get to that point.
I'm glad that you are feeling a connection with your T. That is wonderful.