This vid is based on this photoset and amazing short story by street of mercy on tmblr.
Title: 148 Days
Characters: Clint, Natasha
Summary: The mission should have been an easy one, but Natasha realizes too late that they had been set up. When she tries to reach Clint he is already gone, taken by the enemy. There's no reasonable chance to find him, but Natasha refuses to stop searching for him. Eventally she finds Clint, battered and broken. When he seeks comfort, his nightmares stay away for the first time in 148 days.
Song: The Machines
Actually I don't even know the Avengers - never saw the movie, just the scenes with Jermey and Scarlett aaand well, I do like their characters a lot. :3
I hope you enjoy! :D