I don't know your history but navigating with teens is tricky for any parent and since you've had your boundaries crossed, it is even trickier for you. I'm glad you talked with your T about it for two reasons.
1) It is important that you have a sounding board for any "dumb" questions - that therapy is a safe place for you to ask things, even if you assume you should know something.
2) Parents tend to parent like they were parented. So breaking any cycle - abuse, permissiveness, super strictness, whatever -- means talking about it, recognizing it and learning how to do it differently. So it was really important that your T checked in with you about how you were feeling and what your questions were. Things get triggered and then get in our way with our kids. I wish more Ts would ask about their client's kids.

Your T modeled exactly what we should try to do with our teens - pick up on their vague comments, ask questions and encourage them to ask questions. And give straight forward answers instead of lectures or quizzes.

Good work - you and T!