All I can remember is that Tony is in his lab and maybe he is drunk and he says "I'm sorry, I can't make nine more of me" to Steve and Steve feels super bad about about his "worth ten of you" comment.
Or any other fics about Tony feeling super worthless and Steve/ the team don't realise for a while and then when they do, they try to build him up.
Or any abuse to Tony.
Or Tony becoming young
Or Tony being kindnapped
(I love Tony)