I'm looking for a fic where Steve attempts to apologise to Tony for his remarks when they first meet on the Helicarier in Movie!verse. Tony rebuffs his apology, insisting that Steve doesn't know what he's apologising for. The rest of the fic was about Steve and Tony's developing relationship and Steve realising how awesome Tony is. He later apologises again, admitting that Tony was right -he hadn't known what he was apologising for.
The fic was Steve/Tony.
Status Update: Found! Fic in comments.