It took me probably three months to tell my t that I used to do it and then another month after I started doing it again (I just told him yesterday, that I was doing it again)... I was actually very suprised with his laid back reaction towards it. It was the hardest thing that I have told T so far... It scared him b/c he was just getting up to end the session and I said there is something I need to tell him before we end the session and he said okay sat back down and sat there quietly waiting for what I had to share.

So, I waited until I was comfortable enough with T to share.. If you are feeling comfortable enough to.. go ahead, it will help your T understand you a bit more, I think.