Okay but when Steve looks up and meets Bucky’s eyes, Bucky squeezes Steve’s shoulder so tightly, pressing his thumb into Steve’s collarbone. He’s trying so hard to express something that he can’t say in words, something more meaningful than “I’m with you ‘till the end of the line”.
And as soon as Steve locks eyes with Bucky, he goes from amused smiling to something softer. Something that’s expressed more with his eyes than with his mouth. They have an entire conversation without words, of everything they feel but can’t say.