It's pleasant, isn't it? Like, it's too pleasant for god damn prison, and Bucky's last two roommates have set such a bad standard that he can't help but feel wary. It's that last little quip that sets Steve over the line - too easy, too agreable.

Too attractive, and friendly, and possibly smart although Barnes hasn't had any real confirmation for that. Too good to be true, the roommate lottery, so he points accusingly.

"Alright, what's the catch? What's your deal? I'm not gonna walk in one day to find you licking my shoes or something, right?"