Lincoln Bridge (Destiel)

When Sam Winchester dies in a car crash Dean’s life is shattered. His brother was all he had other than his father who was no more than a drunk. He blames himself and so does his father. He can’t help but feel guilty if it wasn't for him Sam would be alive. He falls into a dark abyss that he can’t seem to get out of. He wants to just all of it to end until Castiel moves to town. Who was this boy? And why was Dean so hell-bent to find out? Dean sure as hell didn't know but something about him made Dean want to know him, he felt like he was the only one who might be able to save him.