Well, I gotta tell you. This was a painful one. I ended up rewriting it like 3 times, and I'm still not happy with it. But I was determined to get it done, so here you go! I hope it's alright at least :)

Thankyou so so so much to everyone who's reviewing, following, favouriting or even just reading this story! You guys are great, and I hope this story is living up to your expectations. If not, I always welcome advice on how to improve! Just let me know :D

This chapter is dedicated to The Lilac Elf of Lothlorean for letting me use her phooft idea ;) And of course, as always, Tosca's Prayer.

Dean looked up from where he leaned on the desk, attempts at getting the chair forgotten, as Gibbs walked back in. Not a word passed between them as Jethro walked around to the corner of the table and unlocked the handcuffs keeping Dean in a hunchback position. The young man rubbed his wrists subconsciously as he looked questioningly to Gibbs.

"This mean you believe me old man?" Gibbs gave a sideways glance at him. "Uh… Sir?"

"This means you're seeing your brother, nothing more." Dean's expression lit up, though he quickly tried to hide it with nonchalance.

"About time," he said enthusiastically. "I swear, it's like you have a rule against keeping suspects in the same room."

"I do actually," replied Gibbs as he led Dean into the hallway. "Rule one."

"Right…" Conversation was cut short when Gibbs opened the door to where Sam was sitting, drumming his fingers against the desk.

Dean smirked. "Hey kid. I see they're keeping you entertained."

Sam grinned back, his features visibly relaxing. "Dean. Thank god. I saw…" he glanced at Gibbs, standing by the doorway. "You know. Last time I saw you, you weren't… Looking too good."

"Yeah, I know." Dean didn't want to imagine what Sam had seen in his vision, but he had a vague idea. He headed over to Sam and spotted the chain linking his brother to the chair. "You gunna get rid of his too or what?" He asked, looking back at the silent agent.

Gibbs walked slowly into the room and over to Sam's handcuffs, producing a key. "I still don't trust you," he stated matter of factly. "Either of you."

"Aw, but Agent Gibbs, we have such innocent faces!" exclaimed Dean as Gibbs unlocked Sam's handcuffs. Gaining an all too well known eye roll from Sam was worth every word.

"Right. Of course you do," replied Gibbs. He left, closing the door behind him and locking it before going into observation. Abby was already there, looking from Gibbs to McGee.

"So? What did you want to talk to me about?" After a moment's silence she pointed at Gibbs, her finger right in his face. "You're warming up to my theory aren't you? You so are!" Her voice was rising with excitement.

"Show her the interrogation McGee," commanded Gibbs without looking away from Abby's inquisitive glare. Abby immediately turned and walked over to the computer screen as McGee sighed and typed on the keyboard. Soon enough the video was playing again, first of Dean leaning over the water, then Tony interrogating him, then Dean chucking the water and…

"Oh my god!" Abby's hands went up to her mouth in shock. It still freaked Gibbs out himself. "Is Tony ok? Where's Tony?" Abby looked frantically around, her hysteria increasing when she noticed for the first time he wasn't there, nor was Ziva.

"It's ok - Hey! Abby!" Gibbs put his hands on her shaking shoulders, breaking through her panic. "He's alright. Ducky's checking him out downstairs now. He's alright Abby. Ziva's with him." Abby slowly calmed down, closing her eyes and breathing deeply. Gibbs kept his hands on her shoulders, making sure she had settled. Suddenly her eyes snapped open again.

"You realise what this means, Gibbs? I was right! My theory was right!" She turned to face the brothers, who were chatting quietly, Dean's back to the mirror. "That means it's all real. All of that supernatural stuff…"

McGee looked at her questioningly. "I thought you always believed in it anyway."

Abby only spared him a glance before going back to studying the brothers. "It's one thing to believe, Tim, it's a whole new level when it's actually proved to you."

"Abby, we don't know for sure that's what happened yet," stressed Gibbs. "We just want your opinion. You're professional, scientific, informed opinion."

Abby nodded. She knew this was her chance to prove things in the dark exist, and that these boys were innocent. She would do it right. Her face set, Abby walked out and right into the now empty interrogation room. Gibbs and McGee watched her quietly. The scientist slipped on some latex gloves from her pocket and ran a finger along the edge of the mirror, the table, the turned over chair, the floor. This was all done in silence. Finally she stood up and nodded, showing her finger through the glass.

"Sulphur!" Just like at the other crime scenes.

"What does that mean Abs?" McGee spoke through the microphone that projected into the room.

"Well, if we're going with the fact that I'm right about all this, which I am, then it means it was a Demon." Abby's eyes widened, her professional mask slipping for a moment. "A demon possessed Tony! I have got to ask him what that was like!"

"Focus, Abby," muttered Gibbs, taking the microphone from McGee.

"Right, sorry." Abby then went to the abandoned plastic cup now lying on the floor. After examining it she picked up the rosary beads. "These are just like the ones in the jar of holy water in their trunk Gibbs!"

"Is there any water left in the cup?"

"There are dregs," she replied after a moment of looking.

"Ok, bring it in." Abby walked back to observation with the rosary beads and plastic cup. "I want you to test the water, see if it isn't full of some acidic chemical, or anything that could have done that to Tony."

Abby's face fell. "Gibbs - "

He silenced her with a hand. "If it's just normal water, with absolutely nothing special about it, then it'll prove your theory. Right Abs?"

Her face once again shone with excitement. "Right! I'll call you with the results." She headed for the door, turning back to face them as she left. "And Gibbs, when I'm right, you owe me so many Caf-Pows!"

If you're right, I'll buy you a lifetime's supply, he thought. Turning back to watch the brothers, he gestured to Tim. "Turn up the volume McGee." Their voices became loud and clear as they muttered to one another.

It was a strange conversation.

"So they don't know about your..?" Dean asked his brother quietly.

Sam laughed nervously. "About how I knew where you'd be, because we planned it earlier?" He nodded his head in the direction of the mirror slightly and said pointedly, "Yeah dude, they know."

"Right," said Dean, getting the message. "Good call."

"So you're ok?" asked Sam. He didn't know how close a call it had been and wanted to know if there were any new injuries to worry about.

"Yeah man, those NCIS agents are pretty efficient." Dean grinned reassuringly, before turning serious. "So what do we do now college boy?"

Sam sighed. "I think that depends on what Agent Gibbs decides. Hopefully we'll be able to get the message across to them - so wait what happened anyway?"

"You don't know?"

"All I know is they saw something on our level of expertise. Did it have to do with Yellow Eyes?"

"Dunno, but it was a demon, so it's possible. Used the guy interrogating me as a meat suit. They didn't take my rosary beads off me though, so I managed to get rid of the guy with a cup of water and Bobby's old chant." Dean seemed pretty proud of himself.

"Wow, you finally remembered it huh?"

"Damn right I did. Not looking so smart now, are we Sammy?"

"So where are the beads now? We might need them in case the demon tries again."

Dean's face fell. "Oh. Yeah, I, uh, kinda dropped them. Back in the other room." Sam sighed and rubbed his temples. But Dean could tell the difference between an exasperated Dean-is-an-idiot gesture and a my-head's-killing-me gesture. "You alright Sammy?"

"Yeah, I just… My head's a bit sore. From, you know. Today's events."

Dean again looked back at the mirror, paranoid about who was watching on the other side. "Yeah, I get ya." Sam knew Dean was worried about the same thing he was. It was one thing to see your friend be ridden by a demon, and then to have to accept the whole supernatural gig, but they didn't want to overcomplicate things by bringing to light Sam's abilities. It often gave the wrong impression. Can't imagine why. There was a moment of silence where Dean studied Sam worriedly before calling to the agents he knew were on the other side of the glass. "You guys got anything for a headache?"

Soon enough Gibbs was walking back in, McGee by his side. Two pills were placed on the table.

"Tylenol," Gibbs muttered simply. Sam nodded his thanks and took the tablets.

"What, no water?" Dean couldn't hold back on the smartass comments.

"I'd rather not get another one of my agents writhing around on the floor," replied Gibbs.

"Hey, I saved that poor bastard's life." Of course Sam had already swallowed the painkillers, so the argument was basically invalid. "How's he doing by the way?"

"We're getting him looked at now," said Gibbs vaguely. To his slight surprise, this caused the brothers to groan in unison.

"No, man, you don't get the ambos involved!" complained Dean. "You really expect to explain that one to them?"

"I never said he was at the hospital," muttered Gibbs impatiently. "I know when to be discrete." McGee quickly looked away, trying not to laugh. Discrete was never a word he'd used when describing his boss.

"So what's going to happen now?" asked Sam, putting aside any questions he had on 'being discrete'.

Gibbs sat down across from them, folding his hands together. "We're going to be doing a bit of research, see what we're dealing with."

"It's just like a classic hunt Sammy," muttered Dean, shaking his head. "I can't believe you guys need more proof. You saw black smoke fly out of your agent's mouth! What more proof do you need?"

"I just want to make sure we have all the facts first."

Dean groaned, but Sam nodded and nudged his brother. "Like you said Dean, it's just like a hunt. We'd want to know if it was a skinwalker instead of a werewolf, right?"

Gibbs stared, but McGee couldn't help himself. "What's a skinwalker?"

"The point is," Gibbs said loudly, "we're going to have to verify a few things before I know you're on our side. And before I believe there are things on the other side. Like skinwalkers, werewolves and shapeshifters. You'll have to excuse me if I need a bit more proof." His eyes squinted in a sarcastic smile.

"I have it right here Gibbs!" everyone turned to see Abby rush into the room, her platform shoes scuffing the carpet and her shining black pigtails bouncing excitedly. "It's water! Simple, plain, unpolluted water." Abby turned to the Winchesters. "Hey Sam!"

Sam waved, keeping one hand by his head to rest on, as Dean's eyes scanned over the Goth in the miniskirt. "And this is?" he asked eagerly.

"Abby. Our forensic scientist." said Gibbs, eyeing Dean suspiciously.

"Wow. You're a scientist?" Dean seemed impressed.

Abby grinned. "The best! And I've just proved that not only are you guys innocent, but that you're just as sane as me or him!" she pointed to McGee overenthusiastically. She turned back to Gibbs. "You owe me a Caf-Pow! No, more like 30 Caf-Pows!" Dean was busy wondering what the hell a Caf-Pow was as Gibbs asked,

"So you tested it Abby?"

"Yep, and it's just plain water. Well, as plain as holy water can be."

Dean grinned. "This chick's smart!"

"That's because this chick is the top scientist in her field," said Abby pointedly, leaving Dean looking sheepish.

Gibbs sighed and rubbed his face with a hand, his eyes closed. Dean opened his mouth but Sam punched him lightly. Wait, he mouthed.

McGee was the first to break the silence. "Does that mean… It really was a demon?"

"Bingo!" called Dean happily. Gibbs looked up and studied the brothers.

"And you fight these things for a living?"

"Well I wouldn't really call it a living, but yeah."

"And that particular… Thing was a demon?"

"One of many."

Gibbs was suddenly looking exhausted. But he also looked resigned. Sam could see the man was finally accepting reality.

"So what the hell was it doing with my agent?"

Sam interrupted his brother's answer. "That might be easier to explain with your other agents here. It'll be simpler if we only say it once. We're sort of on a schedule." By schedule Sam of course meant running out of time to find the yellow eyed demon that killed both their parents, Sam's love and countless others. But, you know. Details.

"Fine." Gibbs stood up. "Let's go see how Tony's doing."

Said Agent Anthony DiNozzo was sitting rigidly on one of the cold metal tables in autopsy. His hands gripped the sides, ignoring the cold of the slab. Memories from being possessed were flashing on and off in his mind as Ducky regaled him and Ziva about a man he once met that had coughed up bile looking like black sludge. Ziva wasn't paying much attention to the story either. She was continuously glancing at Tony and wondering if she should ask him if he was ok for the 7th time.

"Ok, my dear boy, here are the x-rays," announced their medical examiner. They had explained the story to Ducky, who was taking the news pretty well. It must not have been so shocking when you weren't actually there to see it. It was probably less fantastic in Ducky's mind. Tony and Ziva finally zoned in, watching as Ducky put up the sheets on the glowing board to display Tony's lungs. "Now, don't worry about all of that scarring Anthony. That is simply remnants of your bout with Y-Pestis. This, on the other hand…" he gestured to what appeared to be light speckling spread out in the lungs. "I'm not particularly sure what that is… How unusual…"

"That'd be sulphur, Ducky!" Abby led the way into the room, followed by Gibbs, Dean, Sam and McGee bringing up the rear. Ziva and Tony tensed at seeing the brothers without handcuffs. Ducky just seemed surprised.

"What's all this, Jethro?"

"See that, Ducky? That stuff in Tony's lungs?" Abby linked her arm in Ducky's and pointed to the x-rays.

"Of course, dear."

"That's the remains of a demon possessing Tony!" she said happily.

PHOOFT.

I know, not my best work. Sorry. But I have a good feeling about the next chapter - oh my god! Guys, I think we're almost at the end! I think a few more chapters will probably do it. I'm both excited and sad.

Oh! By the way, that last chapter? First thing I've ever proof read. Because I absolutely hate proof reading. Just a little fun fact for you :) Ok, plenty of action coming up I think! See you soon!