Baring your soul to a stranger is difficult for some. You may trust your T, but maybe they aren't at that point yet. Do you think if it could be about a light subject the first few one-on-one's they could trust your T enough for that? Keep it light at first and allow the others to ask questions (keeping the ball in their court), until they become comfortable in therapy. And be patient. It took me six months to finally open up to my T. It took over a year for one of the others to become comfortable enough to talk to him, too. I still have several alters who refuse to talk in therapy but I figure they will be up for it in their own time.