My advice would be to start small. When I first told my T it was just that I was attached and afraid she would abandon me. That was SO HARD but she was super cool about it and kind of already knew but appreciated me bringing it up so we talked about that and it made it easier to bring it up in the future whenever it becomes an issue. I fight against any serious attachment so when I start acting out, it's usually attachment related and we go from there. I have some pretty serious sisterly feelings toward her and is something that we explore fairly often.