Just another Fix-it of Supernatural's ending.
Prologue - Nobody could bring Cas back, Dean was told.
But when he lost all hope, someone showed him a way out of misery.
Dean Winchester promised himself that he was done with the Military and Section 20. He had promised himself that he would never go back, not after what happened on his last mission.
But, that promise flew out the window when Sam showed up at his doorstep begging him to come back.
Memories and nightmares that Dean had been trying so hard to forget came flooding back. Until he met a certain blue eyed soldier who helped him see the light while he was drowning in the dark.