There could be so many things going on with you. Asking for your expertise, in person, could be stirring up your desire to not have things revealed about you that you aren't ready to reveal, or that feel they are being somewhat forced (by way of a T's position) out of you. Feeling so suddenly outed, exposed, and extremely vulnerable could be awfully triggering.

You have more to talk about concerning this with T. He needs the opportunity to clarify, to know how you are feeling, to reconsider, to hear you say "No, this doesn't sound like something I want to do. I have a boundary that feels like it's been crossed and it doesn't feel good at all. I feel frightened and panicky about all this."
Or something along those lines.

Please don't try to figure this all out on your own. It is about both of you, about your relationship and your therapy and it's the two of you who can get this sorted out, as I have all the faith in the world that you will. It's only uncomfortable for now.