My T and I did the exercise about boundaries except she had ME put the string around myself on the floor so I decided where my boundaries were.
Your situation is confusing to me, so I imagine how it is for YOU! I can identify with wanting to know why she didn't tell you she's exT's superisor. I think you have the right to know that. How did you find that out, anyway? From ex T?

I'm not sure why she's showing you the explicit pictures. My T is open about sex with me but she'd never do something like that. I'd be triggered and upset if she did. Maybe she wants you to tell her she's crossing your boundaries, but a T should be more direct about something like that; something seems off! I hope you can tell her your concerns. TELL her you were scared by the pictures and it seemed like she crossed your boundaries. If she's also showing you boundaries, she's not going to be upset that you tell her what you posted here. It seems like that's the only way through it.