Here, at the End of the World: Masterpost -SPN

Summary: He isn't sure how long they sit there in the darkness, watching the heavens rip apart, the only noise the sound of Sam's labored breathing and the impacts of a thousand angels falling to the earth..
Rating: PG
Word count: ~1,300
Warnings: Major character death.

Part  1 | 2 | 3

Post-it Notes and Oil Changes -SPN

Ever since he'd returned to the bunker, Cas had taken to spending his spare time skimming through the vast collection of knowledge the Men of Letters had amassed. Some of it he knew already, and some of it was actually incorrect, but he was constantly amazed by how much these humans had been able to discern through guesswork and research. It was fascinating reading, all of it, and even though Dean mocked him for always having his nose in a book, Cas loved it. Sam said Dean was just jealous because Cas paid more attention to the library than to Dean. Cas hadn't been able to figure out whether or not Sam had meant this as a joke.

Either way, the library had become his favorite place, and while Sam and Dean slept (because they were human and needed their four hours - he understood that now, having been human), he would pour over book after book.