Constellations of Our Souls (слэш)

In the two years since Steve had come out of the ice, he's fought against two alien invasions and knew a bigger, more sinister one could come at any time. He's seen SHIELD turn to Project Insight in an ill-guided attempt to stave off the inevitable, and he's beginning to understand that the Avengers are not the close-knit unit he had hoped they would be after the battle of New York.
The last thing he ever expected was Bucky Barnes to be alive and trying to kill him on a bridge in Washington.
Bucky is slowly recovering from his time with HYDRA, gaining back bits and pieces of himself. It's easier when Steve's not around, though, which leads him to leaving the tower with a new friend as she sets out to learn more about herself.
It'll all lead to a happily ever after, though, because even if Bucky doesn't remember much he does remember vowing to stay with Steve until the end of the line. Even if the end of the line might come at the hands of a robot bent on destroying humanity.
A "Captain America: The Winter Soldier" and "Age of Ultron rewrite for the Infinity Saga Divergent/Our Souls' Constellation Series