Project Phoenix (слэш)

“They told me you were enemies,” the girl said blankly. “They told me I had been forged in hatred.”
Neither Bucky nor Steve said anything for a long time. The girl stayed with her hand pressed to the glass, waiting. This time, the question was there, even if she hadn't asked it outright.
Bucky cleared his throat, tearing his eyes away from Steve's and pushing down on the handle. “Well, they lied,” he said gruffly, and strode out the door without looking back.

Post-TWS, Steve and Bucky's lives are just starting to resemble some kind of normal when a young Hydra agent shows up in the lobby of the Avengers' Tower, claiming to be their daughter.