I was fine about where we used to sit, but one day we had to move to another office for our session. T sat closer to me.

I sent her a mail during the week leading up my next session, and in it I told her how much nicer/safer it had felt in the smaller office with her closer to me.
Now she makes an effort to sit close to me, she even notices in the middle of the session if she's sitting too far away and moves closer.
It is not easy asking for what you want, but especially in therapy we find that T's are very understanding - we under-estimate them, and expect a certain response based on responses from other people