Disclaimer: I don't own anything.

"A demon!?" Morgan asked again in an incredulous voice.

"YES!" JJ said for the fifteenth time, not so patiently anymore. "Look, I don't know much about them except that holy water burns them and they can't get out of devils' traps. Which I have already demonstrated to you."

JJ gestured impatiently to the bored demon she had managed to enclose in an encircled pentagram hastily drawn on the warehouse floor. Its vessel was a kindly-looking middle-aged man, but they had found that whatever creature was inside had a quick temper a rude disposition. Then again… it was a demon, so maybe the alternative would have been more worrying.

"So… should we bring him in?" Prentiss asked uncertainly.

"No!" JJ sighed. She had left the hunting life for a reason - actually, for many reasons - and this was just the damn Winchester luck that she would find herself having to explain this to her colleagues. "It we so much as scratch a hole in the side of that circle he'll probably kill us before we blink or, if we're lucky, smoke out."

"Smoke out?" Reid's rather squeaky voice sounded. Like he had for the past fifteen minutes, he looked torn between absolute fascination at this unexplainable event, and utter fear since none of the many bullets they had put in this man had done any lasting damage.

"Yeah, uh… leave the vessel. That man isn't actually the demon he was just… unlucky enough to be its host." It had to be an adequate explanation for now.

"Oh please!" the demon complained. "If anyone here's unlucky it's me. I didn't even choose this loser myself but I've gotta say, I've never had a vessel that didn't even put up a fight with me. Pathetic!" he started studying his fingernails in a display of ennui.

"Whatever!" JJ rolled her eyes. "I'm gonna call my Dad."

"Your Dad?" Reid asked in shock. JJ hardly ever spoke about her family.

"Yeah, he works with this kind of thing, killing monsters. He'll know what to do," she said distractedly, scrolling through her contacts list. Was it bad that she was actually wishing this had been a regular psychotic serial killer who tortured and murdered victims for some sick personal reasons rooted in his childhood, often with a sexual component?

"Damn! Voicemail!" she hung up and looked conflicted.

"Okay well… you know anybody else in the same… business?" Emily asked. This was beyond a doubt the weirdest thing she had ever experienced, but if there was one thing she was good at it was adapting and solving the problem at hand. And whatever that thing was, it was definitely a problem that needed to be solved.

"I guess I could call my brothers," she said hesitantly.

That took everybody by surprise.

"You have brothers?" Reid questioned. He thought he knew most things about his best friend but it seemed she had been keeping some secrets… "Older or younger?"

"They're my half-brothers and they're younger. 18 and 23 but… I don't know it's just… I don't talk to them and last time I spoke to Dad a few months ago he said he doesn't hunt with them anymore."

"Well, it sounds like a… dangerous job so I guess that makes sense," Morgan reasoned. He thought he was being unreasonably reasonable, actually, considering the immeasurable strangeness of this situation.

"No…" JJ sounded more uncomfortable than they could ever remember her being before. "He wasn't scared for them, he was scared of them, I think. They still hunt, just together and not ever with other people. They're a bit… weird…" she trailed off.

"Weird how?" Emily asked uncertainly. She was pretty sure anyone who hunted monsters for a living was weird by definition.

"I don't even… really know," JJ pinched the bridge of her nose, trying to get rid of the chill she felt just thinking about it. And she hadn't seen them for years. "They just… like what they do a little too much, they… you know what, I'm just being melodramatic, I'll give Dean a call."

…

As it turned out, they were close by and promised to be there within the hour. They had even sounded happy she had called, though she couldn't figure out if it was because they would get to see her or because they would get to take care of a demon. Maybe a bit of both? Or maybe none of the former…

The four BAU agents waited impatiently. Rossi and Hotch arrived as well, but no alert was made to the local police station because… what would they say?

"So, princess?" the demon spoke after a good 50 minutes had passed and the two oldest agents had been updated on the situation and were trying to digest the information they had received. "You're from a hunter family then? That's fun, they're not very common. I know them all. I'll guess which one you're from, okay?" it didn't wait for an answer. "Campbell? Harvelle? How about Styne? They're a creepy bunch! Murphy? No, only one left there," the demon trailed off and appeared to think, so JJ decided to tell. What harm could it do if it made the demon shut up?

"Winchester," she said, and the demon actually flinched. For the first time they got a reaction other than mockery and - as had been the case when they threw holy water at it - mad pain filled laughter.

"What!?" there was definitely a tinge of panic to that tone. "Winchester?"

"Uh, yeah," JJ said slowly.

"And you said you called you brothers! You called Sam and Dean to come for me?" there was unequivocal panic now.

"Why do you know their names?" JJ asked in suspicion. That was a little more information than she was comfortable with demons having about her little brothers, no matter how odd and unnerving they were. She was sure she hadn't mentioned Sam's name even once.

"Oh God!" the curse sounded ridiculous on the tongue of a demon, but then the situation got even stranger as said demon started pleading. "No no, please! Please don't hand me over to them! I'll tell you anything! Anything you want! I'll smoke out and lay low for the rest of your lifetime, I swear, I'll do anything, I'll-"

A voice spoke just behind JJ, making her and everybody else whirl around as nobody had heard the two men enter. The shorter one interrupted the demon.

"Oh my," he said in a cold, mocking tone. "If I didn't know any better I'd say you were scared of us."

He was standing shoulder to shoulder with a taller man who almost looked more like a boy, but who had a matching look of content and murder in his eyes and smirk on his lips.

"Dean. Sam. You scared me!" JJ said, trying to catch her breath. And yes… they had scared her… and continued to scare her…

"Sorry sis. Thanks for calling!" both brothers' smiles turned slightly less predatory as they took in their sister, but they remained where they stood, side by side, scrutinising her with uncomfortable intensity.

"Oh, um, thanks for coming. I've never dealt with a demon so…"

"That's no problem," Dean continued. Apparently he acted as the mouthpiece. "This here's Greg," he gestured to the demon like they were old pals. "He's been a pain in our asses for a while. Haven't you, Greg?" he said, stepping closer to the demon, Sam mirroring his moves with effortless ease, like they were one organism. Neither of them paid any attention to the other agents, who seemed to have forgotten how to speak. And move. Emily wished she hadn't pushed JJ to call these… men? She wasn't entirely sure that's what they were.

"Please, I'm just a low-ranking bureaucrat! I don't know anything," the demon practically whimpered.

Sam huffed in amusement, but Dean was still the one that spoke. "Now that's hard to believe. Bureaucrats see all kinds of papers, all kinds of plans. Let's have a chat, shall we? Sammy's got a new toy I'm sure he can't wait to use."

Sam grinned and pulled a large knife with an ancient looking handle from the lining of his jacket. Yep, that was a whimper.

"Guys," JJ started, then gulped when they turned to her again, but she ploughed on; she had changed both of these boys' diapers for goodness sake! "I just needed you to exorcise it or something not… you know…. torture it."

They both frowned at her. Disapprovingly, like her behaviour was disappointing to them. Then Sam spoke for the first time and his voice was so calm and reassuring it actually sent chills up her spine.

"We understand Jen, but there's a pretty serious situation brewing among the demons and we need to try and get it under control. The more we can find out the better. This is an apocalypse style disaster we're talking about. Besides, it looks like that vessel has already been shot a few times so an exorcism won't save him."

"Oh."

"Don't listen to the hell-spawn!" the demon - Greg, apparently. He probably didn't choose that himself either - yelled out, half in desperation half in disgust.

"Really Greg? 'Hell-spawn' is what you're gonna go with?" Dean chuckled coldly as Sam approached, caressing the blade of the knife almost lovingly. Dean stayed back, arms crossed over his chest and regarding the scene with a smirk.

Sam scraped the knife along the inside of the demon's wrist, drawing blood. Then he dragged his thumb along the cut, letting the blood pool, and he brought his thumb to his mouth, tasting the blood slowly and humming with pleasure. Greg whimpered again.

"I think you know what I want to know," Sam said in that same hypnotic tone. "You can make this so easy. You know how it's going to end."

The demon was almost hyperventilating, panicked eyes glued to Sam's like he couldn't tear them away.

"Ruby! It's Ruby! She's the traitor!" he squeaked, and both Sam and Dean looked disappointed again.

"Pathetic!" Dean scoffed as Sam stood up and took a step back so he was standing shoulder to shoulder with his brother once more. Neither of them said anything, but apparently they had their own way of communicating - or maybe they had just done this countless times before - but as if on cue Dean started rolling up his sleeves and Sam handed him the knife.

"What happened to you arm?" JJ heard herself saying, cursing internally when her brothers' eyes snapped to her in unison, giving her unsolicited goosebumps.

Dean followed her glance towards the inside of his underarm where he had revealed something which looked like a brand shaped like the Nike symbol with opening quotation marks inside. He looked up at her again and smiled, and this time she couldn't suppress the shiver.

"Just a little something to help with hunting," he said vaguely, and exchanged a look with his brother, making Sam chuckle. Like they were sharing some inside joke or… something.

Dean approached the demon again. "That was a very disappointing display of willpower, Greg," he tutted, shaking his head. "I expected more from you."

Then he shoved the knife forcefully through the demon-vessel's chest, and something like electricity sparked through the vessel's body before it slumped forward, dead.

Dean wiped the blood from the blade on the dead man's jeans, then handed it back to Sam who looked between him and the blade in a silent question.

"Nah, I like my own blade better," Dean said, and Sam shrugged, tucking the knife into an inside pocket of his jacket.

They both turned back to their sister who couldn't conceal her horrification at these… creatures her brothers had become. Sam's amused reaction to her expression made her stomach churn.

"All done!" Dean said lightly.

"Uh, yeah," JJ spared a quick glance at the corpse. "Should I salt and burn it or… something?"

"You shouldn't need to," Dean shrugged. "We're off. Call us if you need us again."

JJ watched as her two younger brothers walked out the door. She watched as her colleagues came out of whatever stupor they had been in for the past few minutes. She watched as her own fear was reflected in their eyes.

And she knew that she would make sure she never needed them again.

A/N: I'm not sure if I will write more of this, but for now it's a one-shot. I would love some feedback, so please review if you have the time :)