Don't Look Back, You Can Never Look Back. (слэш)

Tony Stark: billionaire, playboy, philanthropist, and, now, superhero.
It’d only been a few months prior that he’d revealed to the world he was Iron Man and life couldn’t be better.
That is…until he stumbled upon an old abandoned Hydra lab and kinda set off one of their machines by accident. A blast of blue light later and he found himself in the same lab…only it is seventy years earlier and it is full of Hydra agents.
Cue the entrance of the Howling Commandos led by Tony’s childhood hero, Captain America.
Suddenly, Tony is living out a dream. He’s joining up with the Commandos in the search to get Tony back to his right era. It’s the adventure of a lifetime and, at first, it’s amazing…but then he and Steve connect in ways more than just friendship and he finds that he is torn between wanting to stay with him or go back home.
In the end, whatever the result, he loses.