One, Two, One two three

As a soldier, you're taught to accept that you may die. They never teach you how to handle it when you don't. AU Post Endgame, our favourite heroes are all alive and almost all moved on. Nat, Steve and Bucky must cope with being left in the dust. Wars are hard to survive alone. Victories? Even harder. Sometimes even two won't cut it, sometimes you need three. Eventual Throuple.