I have been very attached to teachers and friends moms, therapists or anyone who will let me.
I never really understood it until I realised that my upbringing wasn't normal. I realised that my friends were loved by their parents, they were made to feel special and wanted. I had never felt that at home. I am now grieving the loss of not having a secure attachment and being loved. Being at my friends house was very painful because it was like they were showing me what I was missing in my own life. Therapy is like that now because the more I attach the more I know what I need in real life. I need someone to be interested and to care about me. I also know it's a professional relationship and that's tough.
So I know realistically my t cannot give me what I need but through the attachment/ transference I now know why I crave and long for them. T and I often talk about how I feel she doesn't like me or how I feel she wants to get rid of me. I project this onto authority figures.
It sounds like having someone to attach to and who is secure like your Mc will be healing for you lonesome. My t never flinches or runs away from my attachment. She is by no means perfect but she has really helped with my attachment issues because she has allowed me to attach to her and welcomed most discussion around it. Through talking and doing and processing all of this unmet needs and pain you have endured, that's where the healing is. Well that's just my two cents anyway. My t really values our relationship and will always be honest even when it will hurt me.