Bucky is now an Avenger, after being saved from Hydra by Steve. Bucky spent 70 years at Hydra and is now 106, but looks 23. Steve nor Bucky know that Steves little sister and Buckys girlfriend, is still alive as well

Bucky was walking to the training room, when he hears a familiar voice in Tonys lab. And he follows the voice

he sees Steves sister, long blonde hair and blue eyes. But she's different? She's got a metal arm as well as he does