note,

Dean just got back from Hell. He awoke in a field, bloody cuts and covered in dirt. When Dean finally found his way back to the bunker, Sam opened the door before he could knock or walk in himself.

"Dean..." A sigh of relief exited the younger brother, but he was still tense. This might not be his brother.

"Hey, Sammy." Dean tries to stay standing, but falls onto his brother. Sam holds him up and leads the eldest brother to his bedroom. Dean passed out immediately. He was exhausted from the walking.

Meanwhile, Castiel was preparing to tell Dean something. Something he's been keeping since the day he raised the man from perdition. Since the day he laid his crystal blue eyes on those emerald green ones.