Frankly, it's maybe a little sad how much that look is Steve's favorite look. Maybe because it means Bucky's not freaking out. Maybe because it's viscerally familiar. Maybe both, or neither.

Either way, "Oh," Steve says, softly, because - "Okay." He thinks he gets what Bucky's trying to say, anyway. He hopes so.

Even if, "If you wanted to. That would be okay. I just want you to be okay." If that means pulling himself out of Bucky's life, well. Steve won't pretend that might make things easier, in a lot of ways. Even if not all of them.