In 1945, Steve Rogers trades himself to the Red Room in exchange for the Winter Soldier. They accept his offer, but don't let Bucky go. After all, their supersoldiers come as a matched set.
This fic has some kickass powertrips in store, just you wait. It's remarkably uplifting despite its dark nature.
Great - Oh but Steve and Bucky are incredible in this, deeply in love and no matter what the world throws at them they're the one thing neither of them can forget. Very well done.