Hi! I'm looking for a fic where the Winter Solider was a separate personality from Bucky's and Tony keeps stumbling across "Bucky" in the Avengers Tower when he's actually the Winter Soldier. There was one part where Tony finds WS reading a book and then mentions it to Bucky later and Bucky freaks out because the book is about brainwashing. That's when Tony, Bucky and the other Avengers realize the different personalities.
I think I read it on AO3, but I can't find it for the life of me.
FOUND: Link in Comments!