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Once upon a time Steve had believed he was destined to die alone. Bucky was going to marry some nice girl and Steve would have no one.
Going into the ice was almost peaceful. He always knew it would end like this. He just wished Bucky had a better life.
Then he entered the future and there was Sam and Sam was amazing. Everything Steve didn't think he could have.
And then Bucky came back. And they didn't make Steve choose. He could have them both. He could love them. Forever. And they loved him. Forever, too. It was heaven.