This sounds like an exact description of my relationship with my T. I've been to various therapists over the years and have probably gotten the most progress I'm going to get out of therapy, I mostly now use it as a tool to not perish of loneliness. I live with my family but they're toxic and I stay in my room avoiding them. I'm autistic and depressed and just don't have the energy to develop friendships right now. My T is the only person I have. Our sessions are either spent ranting about my toxic homelife or bonding over some random concept. We've talked about many things, philosophy, war, art, etc. I do really enjoy him as a person which is rare for me and I admittedly envy having not bonded with him in a different setting so we could have been real friends but I still appreciate everything he helps me out as the role of my therapist. Once I get out of the toxic home I'm stuck in right now, hopefully, I won't be so depressed and will have the energy to put into real friendships but for now, it's just T and I.