Dean was in the library sitting at a table, nose in a book, and a tumbler of Jack Daniel's sitting on the table beside him. Sam had gone out to get away for a bit, Dean didn't expect him back until morning. He couldn't blame him really, after everything the need to just get away and lose himself in a warm soft body was certainly tempting...but all he could think about was the body of one Castiel, Angel of the Lord, and current skin suit to Lucifer. He was almost desperate to find a way to save his friend and that was why he was deep in the lore books instead of out with his brother.

Dean heard boots on the stairs but instead of looking he just called out. "Forget something?" He asked thinking it was Sam. It wasn't until Lucifer spoke that Dean's head shot up quickly and his eyes landed on the vessel of his once best friend.

"How did!?" He was up out of the chair in a moment, book on the floor as he faced off against the archangel. They'd warded the bunker, how had he managed to just stroll in the front door like he owned the place?