I knew.

[even if steve could lie, he wouldn't, not to bucky. there's still a little tension in his shoulders, because try as he might, he just can't predict his friend's reaction. it's not violence that he's worried about, he doesn't want him to run.]

I wasn't sure, not at first. [steve offers him a lopsided smile, one thing that the serum didn't change.] You're good. I thought I might be [wishful thinking] imagining things. Something that might make me feel a little more at home.