This is a Sabriel Fanfiction with just a glimpse of Destiel. Warning: sorry for any feels. (Art not mine)

S.H.I.E.L.D. has a new super human to worry about. At the same time, Bucky Barnes is introduced into the Avengers as the Winter Soldier. They soon find out that the new super human isn't so new; she's actually quite old, and a new super human isn't the only old thing they're dealing with...

An Anastasia Winter Widow AU "If you want to pass yourself off as Bucky, you gotta be a little more friendly," she accuses. "Oh no," the Soldier grumbles. "Don't tell me this Barnes guy is some sort of cheerful do-gooder." Natalia shrugs, shifting her bag over her shoulder, then slips it off and hands it to him. He takes it with his left, the stronger arm, and stares at her. "Bucky Barnes would hold a girl's bag for her," Natalia says and the Winter Soldier glares. "Would he," he replies dryly and Natalia just smiles at him smugly and turns back around. "Come on, Mr Barnes, we're almost to the station," she says and he follows her grumpily. Find on AO3 and FF.net