I would take this as anything you have processed in your head since discussing it with him...( not details of what happend per se) such as did you think it was cathartic to share? Did you feel embarrassed by what you told him? Do you feel fear for revealing...etc..I think generally speaking, T's want to know the feelings that come up around the things we bring to therapy.

Going through this now with my own T and every session he asks...is it okay if I ask you....or can you go there for a moment....

The flip side would be far worse (for me at least) - talking about CSA and then having a T leave it completely at your will to bring up again. It's tough material and a fine balance for a T to show they care and you can share without feeling like they are pushing you too hard emotionally.