Sam Winchester sat sullenly in the speeding Impala as his brother, Dean, smacked his calloused hands against the wheel, mouthing the guitar solo to an AC/DC song he'd heard at least a thousand times. Sam's patience began to wear thin, his pursing lips only a small sign of the impatience brewing inside of him.

"Dean," Sam snapped in his paternal tone, "why do you have to do that?"

Dean looked over to his brother with a confused furrowed eyebrow as he replied, "Do what?"

"That!" Sam gestured angrily at Dean in general, "Listen to stupid, old rock music and annoyingly tap your hands against the wheel right after a job!"

"Hey," Dean retorted, squinting his eyes and puckering his lips as he ignored the road and turned his attention towards Sam. Only Dean's "I'm-your-big-brother-so-shut-up" look could battle that of Sam's condescending paternal one, which he wore valiantly as he continued, "Like I said before, driver calls the shots for music. No complaining, Big Foot. Secondly, we did an awesome job on that case! Excuse me for wanting to celebrate a little."

Dean returned his gaze to the road, confident in every word. However, it was evident that Sam still didn't see eye-to-eye, although his tone had gotten a little more defensive now, "It was just a salt-and-burn job, Dean. No big deal."

But Dean didn't want to hear it. It was the same old routine over and over again, almost as old as "Back In Black". Dean would tell Sam that at least they were saving lives, and Sam would question if they were really making an impact at all, and Dean would tell him that of course they were and to shut up, but of course Sam would drag it out. Dean just didn't want to deal with that bull shit right now. He just wanted to get back to his room in their "Bat Cave".

So Dean dropped the subject as he turned the Impala onto the dirt road that you would miss if you blinked. The road twisted and turned along a forest, and then suddenly there was a cement wall and stairs leading down to the door that held their new home that had once been the "Men Of Letters" stronghold.

"You want a burger or somethin'?" Dean asked Sam as they made their way inside, trotting downstairs and to the foyer to drop off their bags as Sam turned on the lights and water.

"Yeah, sounds good!" Sam called down below. He waited a moment. There was no reply, not even a grunt.

"Dean?" Sam called again. No response.

Sam's jaw clenched as he rushed downstairs, calling out Dean's name again. He entered the foyer quickly, saying, "Dean, why won't you—"

His response was cut off by what he saw: Dean embracing Castiel.

Immediately, Dean noticed Sam and broke away from Cas, coughing and wiping at his eyes quickly as his gruff voice replied a little more weakly than Sam felt comfortable with, "Yeah, yeah, I'm here, Sammy. And Cas, too."
Sam decided to ignore Dean's moment of weakness as he walked over to Cas with a smile, patting him on the shoulder as he said, "Hey, Cas! Didn't expect you. What's up?"
"Well, currently the ceiling," Cas replied with his monotonous, deep voice, "However, if you return outside then it is the sky, and above that is—"

"Not what I mean, Cas," Sam said with a patient smile, "I meant, what are you doing here?"

"I fear you two are in danger," Cas said, his tone more serious than usual. Dean turned around and asked, "In danger? From what?"

Cas sighed strictly, walking around one of the long desks that filled the library hall as he said, "We're not sure. However, we are certain it involves you two—as usual—and that it is very dangerous."
"Well, what is it?" Sam asked. Cas's back had been turned to them, and he stayed that way, not responding to Sam and being as still as a statue.

"Cas...?" Dean asked softly. To Dean's call, Cas took a deep breath and turned around, obvious pain shown on his face as he replied, "It's killed ten angels."

"Ten?!" Sam replied dubiously, "That's not possible! Not even for vamps or werewolves! Not even an alpha!"
"Well, it is so. And it is making its way towards Lebanon, Kansas."

"That's here!" Dean acknowledged.

"Yes, so I have been sent to protect you for as long as needed," Cas replied.

"Of course, thank you, Cas. Really," Sam nodded, with a smile that wasn't all together there.

"Alright, so let's go then," Cas said, already walking towards the entrance. Dean called back, "Wait, Cas! We just got back from a hunt, can't we at least rest a while?"

Cas stopped and turned back quickly, "There is no time, it is moving quickly. We must reach Tulsa Oklahoma before sunrise. Hurry."

And with that Cas turned on his heels, a small sound of fluttering wings was created, and he had disappeared (presumably into the Impala).

"Damn angels," Dean muttered, "Ok, let's go, Sammy."

"Wait, wait, wait," Sam replied, holding Dean back as he started to walk away again, "We're just going to leave? We're not going to confront this thing?"

"Sam, you heard Cas, it killed ten angels. We'll go to Tulsa, do some research so we're a little more prepared, and it'll follow. Then we'll gank it. Now c'mon, let's go," Dean replied, starting to walk towards the entrance again. Sam held onto him, though, "Dean, doesn't this seem a little suspicious to you?"

Dean sighed and squinted his eyes back at Sam, always giving him the benefit of the doubt, "Ok, Sam, what do you want to do. Stay here and risk the chance of dying?"
"Well, you heard what Henry said, this was the Men of Letters' stronghold, the safest place in the world! Much safer than Tulsa!" Sam replied dramatically.

"Yeah, but if Cas is right then it won't be for much longer," Dean replied, feeling his anger build up dangerously. All Sam could do was sigh.

Dean took a deep breath and replied, "Look, I don't want to leave this place either, ok? But I trust Cas. And I think he knows what's best right now. We'll go for a few days until Cas thinks it's safe enough, see if we can find anything, and then we'll come back. Sound good?"

Sam sighed a little more softly this time, did a small eye roll, and then nodded. Dean nodded back and grabbed the bag he had just lain on the wooden desk from their recently finished hunt before replying, "Ok, get packed up and we'll meet you in the Impala."