[ He doesn't flinch when Stark says he'll have to live through all the terrible shit he's done- Bucky has to deal with that on a near-daily basis, and near-nightly too. Nightmares are a pretty regular occurrence when he can sleep (all those years on the run makes his resting habits pretty sporadic, and light at that). Seeing the faces of all the people he's killed or the missions he's been on is something Bucky has come to accept as a form of penance; even if he wasn't under his own control, even if he was tortured and brainwashed, he still ended so many lives.

It's when Stark says that he might not be able to un-brainwash Bucky that Bucky's stomach drops through the floor, and he closes his eyes. The deepest fear he's had is that everything is permanent, that there's no way to undo the conditioning. That he'll be an automaton on a hair-trigger for the rest of his (un)natural life.

Before the despair can overtake him, a glimmer of hope. Or something cousin to that. Bucky looks up, daring to gamble. He can't help but sigh, and let go of the breath he'd been holding. ]

I don't have a way to pay you, or recompense you in any way... but I can do things. Anything, really. Whatever you'd need.