"All Over Again by teddy91205"
When Tony snaps his fingers he knows he won't survive which is why he doesn't expect to wake up. Especially not at the bottom of a mountain in the 1940s right after Bucky's fall. When they're taken by Soviets and later Hydra Tony and Bucky will need to try and escape but it won't come easily or quickly. It will take a long time to come home if home is what it ever was.
One thing they have in common is that they both have a very long coming home story.