I read this fic which was part of a series where Dean was adopted/foster child. He had an abusive boyfriend (probably Crowley) who kidnapped him at some point. Cas was the friend who was trying to help. I remember Cas called the cops when Dean was kidnapped. There is a sequel where Dean and Cas are all grown up and well adjusted (mostly). Cas is a doctor and I think Dean is a social worker. They haven't seen each other in a while and I believe there is some villain from the past posing a threat. The fic ends with the villain taken care of using dubious means.
Also, Dean has tattoos.
I have been looking for this for so long, I am beginning to think I imagined it. Please help me out, good people of the internet. I know this is a very vague description, but this is my last hope.