I remember the winter soldier turning back to Bucky for some reason and he couldn’t remember anything from his time as the soldier. And whenever they would fight and the soldier would come back out, he’d go after tony. Everyone tried to keep him away from tony bc they thought he wanted to hurt him, but the soldier really just wanted to return to him.
I hope that’s enough info for someone to recall this fic, I really can’t remember anything else specific. I read it so long ago