I'm looking for a story set after-ish Bucky's recovery, where he and Steve are living/back together. Steve starts worrying about Bucky's behaviour, feeling like he's hiding something or acting shifty (I think one incident specifically related to him reading/not reading?) or just that there's something wrong and he can't figure out what. He ask the others if they know anything, but finds out nothing. Finally Pepper (or possibly Natasha?) takes pity on him and lets him in on Bucky's secret- he's been hiding the fact that he needs glasses for reading (it doesn't affect his sniping abilities) because he thought they made him look stupid/weak/dorky. Steve doesn't think they do at all, and reassures Bucky of that, and gets him to stop hiding them.
Edit: found it, chapter 6 of
this fic