I often fantasized about doing interesting things with my last therapist, traveling together, for example. Sometimes the fantasies felt obsessive but mostly they were comforting and pleasant. I think that as long as we don't use the fantasizing excessively to escape and avoid real things, and we don't fool ourselves into believing they will or can happen, it can be quite positive, like an internal soothing mechanism and safe place that does not require external influence in the moment, only memories of it and our imagination. For example, I sometimes imagined him as my brother. I don't have siblings or much family at all at this point so it can be comforting even knowing the fantasies have no real perspective. I also often wondered if I should share the fantasies with the T... sometimes I did, other times kept them to myself.