These Days by the–mantling–dark:
Steve/Bucky, set immediately after ca:tws with some flashbacks to the 1930s/40s, focus on recovery with original plot points coming in later on, unusual and positive characterization of Steve’s relationships with Thor and Natasha, beautiful spare use of language, intriguing insights into Bucky’s and Nat’s thought processes and Steve’s characterization, minimal sex with no distinct top/bottom, just a really all-around good fanfic, definitely a keeper
Author isn’t on AO3, everything can be found on their Tumblr. Most of their fic is Thorki; I’m looking forward to reading more.