Sam being in bad health doesn't exactly narrow down timelines, but considering Charlie's from after their time in Purgatory, it must have something to do with the trials. It's true that Sam had still been suffering from symptoms when Castiel first arrived here, but he's improved slowly but surely over time. Sam seems capable of bouncing back from just about anything, amazingly enough.

There are all kinds of terms that Charlie throws out which mean nothing to Castiel -- AUs, canon, shipping -- but he gets the general gist. People watch or read a fictional story and then write their own stories about the characters.

It's creative, though it strikes him as a waste of time, mainly because Castiel hasn't yet mastered the concepts of "fun" or "taking it easy." Though he does have to take a minute to wonder what Destiel is. There's no angel with that name, so did these amateur writers make that up? Strange.

Around the time that Charlie gets to speaking about song fics and Tool and Stinkfist, Castiel's lost both interest and any idea of what she's talking about.

"I see," he says once she's decided to stop talking. "I had no idea that the Winchester gospel became so popular." At least everyone out there thinks it's all fictional. Better that it remains that way.

A subject change is definitely in order, though. "... I can tell you where Sam and Dean's rooms are, if you need to speak to them."