I remember reading a fic a looong time ago that was a non-powered-AU, where Steve and Tony (and Clint, Bruce, Natasha, etc.) had known each other since they were kids and had a pretty strong table-top game group going. Possibly Steve had moved away for a while and then came back and re-joined Tony and everyone else. There was lots and lots of pining by both Tony and Steve, but they get together in the end. I think because Steve discovers Tony's box of stuff-Steve-had-given-him-over-the-years.
Ring any bells?
ETA: Found. Link in comments.