Bucky and Natasha drive around the country, taking out HYDRA agents. Along the way, Bucky learns a thing or two.
Bucky accidentally becomes a surrogate brother to half the neighborhood, purely via the power of PBS.
Sam's had a lot of unexpected experiences and has dealt with a lot of shit. But all of that pales in comparison to what happens when he and Steve find Bucky.
(Or, Sam becomes a part-time therapist, falls in love, and gets some closure. Not necessarily in that order.)