I think that can work very well (has for me) if as therapy goes on it becomes more "us" and less T. I still have a couple phrases in my T's voice that goes on in my head but mostly I have taken over the fantasies of talking with T so I talk to myself (so much healthier talking to one's self :-) and soothe myself. I guess because the reality of seeing T at some point has ended and it's not just between sessions, etc. and I had a bit too extreme a fantasy life (partly why I entered therapy in the first place).