Do It All Over Again (слэш)

Betrayal was a feeling Tony was used to, had felt it when his parents died and left him alone. Had felt it when his second father figure tried to kill him, as he literally ripped his heart out.
But nothing had felt this painful, nothing had prepared him for Steve. Steve had known for gods knows how long who had killed his parents. But instead of telling him, he had left him with a shield in his arc reactor in Siberia.
Now here he was, slowly dying as his vision blurred.
That was until he found himself back in the past.
(I'm really bad with summaries. It's about Tony going back in time and becoming best friends with Bucky until it turns into more.)