I'm curious as to why your T thought that it was your mother who had been sexually abusing you. What you mention about your father doing now and the memory about the nipples (which, as others said, is abuse, even if it was you doing that--your father should have just said "no" and not allowed it). It makes me wonder if, assuming some sort of abuse took place, it could have actually been your father? I think you had talked about a fixation on maternal figures, right? If that's the case, maybe it's because your mother wasn't protecting you from it? I think you should definitely bring all this up with your T.