Yes, I've told my T that I felt romantic attraction toward her, and we're both female. She said once that she was flattered, and that it was okay to feel that way. I was embarrassed, so we talked about what it would mean if I were bisexual. I don't think I am, though. I agree that my feelings would be the same if my T were a man, that it's transference, mostly.

To answer your other questions, yes it was harder for me to tell my T because I didn't want her to think I was gay. It was positive for me to her because her acceptance of me is very healing, it also helped me to realize that I can tell her anything.