I think you did a very good job of explaining it right here. I agree with KD that if you don't think you can tell her in person that printing it out may be easier. It seems like you believe you are ready to discuss it with your t but just have that last little bit of fear to overcome.

I don't know your t but mine just asked that I contact her if I felt I was going to follow through. It sounds in your situation that should not be an issue to promise that to your t.

Another option prior to revealing your feelings around this issue you could ask your t generically how they handle something like this and see what they say. Therefore you could decide at that time how much to reveal.

Good luck and stay safe.