"The Falcon and the Winter Soldier" fanfiction.
Set in an alternate universe, Sam and Bucky work together (despite often butting heads) to take down John Walker while maintaining a positive public image for themselves. During a losing streak, their luck begins to turn as they stumble across a young psychic.
The socially-inept teenage orphan with great potential struggles to tap into her powers, and finds that working with the two avengers could be promising. Although she keeps much of the details of her story private at first, she eventually grows to open up to her new team. The young witch who calls herself "Angel" recruits her long-time mentor to aid in the struggle against the corrupt John Walker. Although the boys have a hard time understanding Angel and her ways, her mentor does her best to teach them before she must leave.
An action-adventure, sci-fi, fantasy, and comedic drama. If you like Doctor Strange, Scarlet Witch/WandaVision, Captain Marvel or Thor, you will most likely appreciate the plot and original characters of "Falcon, Winter Soldier, and an Angel."