He nods slightly against Tony's collarbone more so he can feel the motion than see it. "I know." Trust is the only thing that will get them through this. "I won't pretend I'm not conflicted." Bucky is whole here. It's so tempting to leave it all alone and just live a life here. It's everything he could want right now just given to him without a fight. "But, I'm with you no matter what happens next." As little sense as it makes to have Bucky from two separate eras in need of his help, he knows he can't abandon the deeply traumatized one in desperate need of his best friend's protection against the whole world. He can't abandon the Avengers and Sam either for that matter. He just wishes he could wrap his head around how this is possible to begin with.