I am searching for a specific Dean/Cas AU story I read last year on AO3. It isn't tagged so I am unable to find it through the search filters there; hopefully one of you has it bookmarked!

I remember in it Castiel was a newly appointed teacher who was just dumped by his boyfriend Balthazar with no explanation. Castiel has very low self-esteem as a result of extreme bullying through high-school where one of his worst tormentos was Dean.

Dean is a newly-divorced dad dealing with his ex Lisa and son Ben moving on without him to a new family. He too, was blindsided by the dissolution of his relationship. He has a low self-esteem as a result of his abusive father.

The two meet again when Dean is working on Cas's new house, and Dean apologises sincerely for his treatment of Cas. They become friends, and eventually lovers.

I think there was one more chapter to go but the story stalled for quite a while, possibly abandoned? Does this ring a bell to anyone?

Small details I (think) I remember:
+ Dean discovers carpentry is his passion and he's very good at it.
+ Dean and Cas went on vacation together to some city (maybe Boston)? Castiel spotted Balthazar there.