To The Past Our Lives Began (слэш)

Three years since Steve Rogers had left. Three years since Bucky thought he could never adjust to this new world. Three years since it had all seemed hopeless.
Three years was a long time. Bucky had adjusted. He'd found his own place in the world, his own team. Steve had chosen to live his own life, and that was okay. If anyone in the world deserved to be a bit selfish, it was him.
That didn't stop Bucky from sometimes thinking, on the nights when the world somehow felt both heavy and too far away, what if. What if?
The decision had long been made, and it wasn't going to change. Steve was not coming back. What if? What if nothing.