I can't remember anything more specific than that, but I hope someone recognizes it regardless. I do know that it's Steve/Tony and that I read it on Ao3. I want to say that it was a fairly long fic, but I'm not sure.
Also, any recs where Steve is dealing with PTSD from either Bucky's fall or his own icy crash would be most welcome. Thanks in advance!
Found: many names in history, none of them are ours Thank you, rakelnott!