Okay, so I want to explain a few things about this story before you begin. First of all, this will be yaoi. Secondly, there is a warning hidden in the title of this story. It's a play on jail bait seeing as Rin is only 16, so if you're not comfortable with that you should turn back now. I also want to apologize to anyone who has read the manga for Servamp as I have not and all of my knowledge of World End comes from the internet. Hopefully I didn't mess anything up to much, but if I did please don't hate me! Either way, please review and let me know what you think! I always try to pick the perfect pairing for a character based on personalities and likes which is why I have a few cross over stories. Enjoy!

Disclaimer: I do not own Servamp, Blue Exorcist or any of the characters!

Chapter 1

Rin had gone on his first solo mission after receiving his knight meister and he had managed to screw it up, just like everything else in his life. The demon he had been fighting had gone deep into the woods and, since no one was around, he had flamed up in order to defeat it. As soon as he had sheathed his sword, Kurikara, Kuro warned him that they were surrounded by a large number of humans.

"Who's there?!" He demanded. Kuro stood at his feet, tensed and prepared to switch into his larger form if needed.

'There!' Kuro told Rin and pointed his body toward the trees just to the left and behind them. Rin turned and saw a thin, brunette man walking toward him, wearing what looked like a lab coat. As he walked the man reached up and adjusted his glasses, looking completely calm. He stopped about 10 feet away from the pair.

"Hello. My name is Syuhei Tsuyuki. I'm with an organization called C3. We have a proposition for you."

"I'm listening," Rin responded. Both Kuro and his gut were telling him not to trust this guy.

"Since you are an exorcist, we were wondering if you would come and have a look at our facility? We've been having issues with demons for a few years, but now someone has gone missing." Rin still hesitated, but he couldn't ignore a plea for help when someone might be in danger.

"How long have they been missing?"

"Two days now. Will you help?"

"Why not call a more experienced exorcist?" Rin asked, eyeing the man suspiciously.

"You are the closest one to our facility and this is rather urgent. Please?" The man looked sincere in his worry for the missing person so, reluctantly, Rin agreed and allowed himself to be led to their facility.

It was a long walk to C3's facility and it was nearly night by the time they arrived. Kuro, who had ridden most of the way on Rin's shoulders, tensed as they neared what appeared to be a back door.

'I don't like it Rin. I smell a lot of creatures in there,' Kuro informed him. To hide their telepathy Rin gave a gentle nod in response and they both prepared themselves to fight. They were led through two sets of heavy doors and down a long corridor before they turned left to stop in a room that looked like a laboratory. This was obviously Tsuyuki's office as he fit right in and looked very much at home here.

"Before we go any further there is one policy we have to have you follow." Rin furrowed his brow. "All animals are required to wear a tracker beyond this point. It's a safety thing." The man shrugged apologetically, but held up a small, metal collar.

"It's a tracker?" The man nodded. "And it comes off as soon as we're ready to leave?" Another nod. "Fine then." Kuro narrowed his eyes at Rin, clearly unhappy, but he allowed the collar to be snapped in place around his neck.

'Rin, watch out!' Kuro suddenly tried to warn him, but before he could react arms had wrapped around him and hands were tightly gripping his arms, preventing him from moving. His sword and its sheath were removed from his back and a metal collar was snapped around his neck as well.

"What the hell?!" He screamed as he struggled against the people that held him.

"First of all, I'd like to make it clear that I spoke no lies. Tinker goes missing all the time, but she always comes back. We do have issues in this facility, but the issues are our inmates. You see, this is a prison." Mephisto suddenly appeared in a puff of smoke and Tsuyuki clenched his fists angrily. Rin glared at the two men who were standing side by side.

"Sorry Rin! They're after me too and I can't stop them. I'm actually going back to Gehenna to avoid the same fate as you. Bye!" He disappeared and both Rin and Kuro growled at the spot he had just occupied. Tsuyuki was glaring at the same spot and sighed in frustration.

That had been over an hour ago now. After Mephisto had left Tsuyuki had explained that the metal collars were trackers, but they were also suppressors designed to block demon powers. While wearing them, Kuro would be unable to transform and Rin would be unable to use his flames. The pair of demons had then been processed into the prison, known as Chiyoda City Confinement (or C3), and Rin had been given a prison uniform to change into.

The uniform was a pair of gray cotton pants, a white cotton tank top for an undershirt, and a gray button up shirt that matched the pants. Since it was summer the shirt was short sleeved. It would be long sleeved in the winter. He was given a new pair of black boxers and was told that he will be given fresh clothing after every shower. Rin had no personal items with him, other than his sword, but Tsuyuki told him he would be given a new book each week to keep him entertained. Kuro would be allowed to share a cell with him since the cat was a familiar and unable to be separated from its master.

Rin stared at the floor as he walked behind Tsuyuki toward the cell that would become his new home. For transport, after he had finished changing, they had cuffed his hands and feet together and a small chain had been connected between Kuro's collar and Rin's. Kuro rode on Rin's shoulder, glaring angrily at the guards that were surrounding them. When the guards finally stopped them, Tsuyuki opened the door to a cell that was lined with caging to contain something as small as Kuro. One of the guards removed the chains, unlocking the chain connecting Rin and Kuro last. As he did so, he leaned in to whisper in Rin's ear.

"Stay away from the left wall," he warned before stepping aside. Rin frowned, but quickly moved as the guards behind him prodded him into the cell. The door rattled shut behind him and a loud click signaled its locking.

"Supper will be around soon," Tsuyuki called as he turned to leave. When the footsteps died away and Rin thought he was alone, he slumped to the floor.

"Dammit, dammit, dammit! First that fucking crystal and the Grigori, and the True Cross Order torturing me, now this bullshit?! What are they gonna do to me now Kuro?" He covered his face with his hands, shaking his head in disbelief of his situation.

'Rin...' Kuro didn't seem to know how to reply, so the cat simply curled up on his lap and rubbed his head against his masters stomach, trying to comfort Rin.

World End had been intrigued when they led a new inmate into the cell that was connected to his. Since he had killed the last three, they had been leaving that cell empty, but something must have changed. Or maybe they wanted this inmate dead. Wor wasn't sure, but he was intrigued either way. The inmate had kept his head down as they walked up and the chains were removed. As Wor watched, one of the guards whispered a warning to the new guy before casting a quick sideways glance at him and he smirked at the man.

Once the guards were gone, Wor silently walked over to the side of his cell that was connected to the new guy's and watched as he dropped himself to the floor. He wasn't overly far away from this side of the cell and Wor suddenly felt extremely thirsty. If the holes in the cage weren't so small, he would have attempted to reach out and grab the navy haired man, who was still oblivious to his presence. When the man on the floor started speaking, Wor was snapped out of his thirst fueled thoughts. As he listened he began to wonder what this man had done and why he was here. He leaned forward and accidentally bumped his head on one of the vertical bars.

'Rin!' Kuro jumped up, hissing. Rin raised his head and glanced up at the man on the other side of the bars.

"Did you just say 'Kuro'?" The man asked him. He nearly answered when he suddenly remembered the guards warning. This man was on the left side of his cell...the side he had been told to avoid. There had to be a reason for that guard to warn him. He examined his neighbor cautiously. The man had white hair and pale skin. He was tall, nearly six feet if Rin guessed correctly, and his eyes were red. Rin wondered what he was, as he knew this facility contained only the supernatural. He also noticed that the man wore the same gray pants and white tank top of the prison uniform, but he was not wearing the button up shirt.

"Yeah, this is Kuro, and I'm Rin." He motioned to Kuro, who was still glaring at the white haired man.

"Is he actually a cat and nothing else?" The man seemed quite amused. Rin stared, slightly annoyed that the man hadn't responded with his own name, as courtesy dictated.

"Well, he's a Cat Sídhe, but yeah."

"Huh?"

"A demon," Rin explained, slightly exasperated at this man's lack of knowledge.

"A demon cat?" Rin nodded. Suddenly the man burst out laughing. He threw his head back and slapped one of his legs in his amusement.

"You got a problem with that?!" Rin angrily demanded. Kuro hissed again.

"No..." the man's laughter died down to chuckles as he tried to speak. "My brother...his name is Kuro. His animal form is a black cat..." He paused to laugh again. "I think it's funny and kinda ironic to meet an actual black cat who's a demon named Kuro!"

"What do you mean ironic?" Rin was still cautious of the man, but he still found himself wanting to know more about him. They were going to be here for a long time, so they may as well talk.

"Well, people always call us demons, but we're far from it. We're Servamps," the man explained, sounding like the explanation should be everything needed.

"Huh?" It was Rin's turn to sound dumb.

"Servant Vampires. We're the strongest vampires in existence. All other vampires were created by us as subclasses."

"Oh. You make us demons sound kinda lame," Rin laughed. At that comment Wor finally noticed the tail swinging lazily behind his new neighbor.

"So is that why you're in here? Because you're a demon?"

"Yeah. I exist so I get captured a by a lot of different organizations. I didn't choose my dad, but they still think I'm gonna be him one day, no matter how hard I try to prove otherwise!" Rin clenched his fists, and then realized that he probably shouldn't have said all that. Trying to distract the other man he asked, "How about you?"

"Well..." He scratched his head. "I'm World End, the Servamp of gluttony. I sorta stole a bunch of food, because I'm always hungry. That's how they caught me. They kinda starve me here. I don't technically need food in order to live, but since I'm the Servamp of gluttony...if I don't eat I get...testy and very, very hungry..." He paused, now looking at the floor, seemingly unsure of himself.

Rin moved to the back of his cell to sit on the uncomfortable looking bed. His gut was telling him that this man wasn't bad. Perhaps he had done a bad thing, which was highly likely according to how the man was now acting, but over all he was good. Kuro seemed to have the same feeling as the cat relaxed and jumped up on the bed, laying down to take a nap. Rin pulled his feet up on the bed and his tail wrapped around him as he sat, waiting for World End to continue.

"My instincts kinda took over and I killed the last three people that they put in that cell..."

"By killed you mean..." Rin motioned for him to continue.

"I drained every drop of blood from their body! I'm a vampire, it's what I do," he blurted out before burying his face in his hands and turning away from the bars to face the opposite wall, which was solid. He looked ashamed and Rin felt a sudden urge to physically comfort the man. He ignored the urge and offered some friendly words instead.

"Because they starved you, right? You don't actually like killing people do you?"

"Of course not! I just like food! I've never even had an eve. I don't drink blood ever!" Wor whirled to face his neighbor, preparing himself to see fear or horror or some other look of disgust on the man's face. He was not prepared to see the knowing and friendly smile that Rin was currently wearing.

"I get it. My instincts take over when I'm trying to protect people. That's how my friends found out I was a demon. I released my powers during a dangerous fight and they all saw. They hated me at first, but when they realized I wouldn't hurt them they came around. I don't think they can help me now though..."

Just then their dinner trays were slid under their doors, drawing both of their attentions. Kuro uncurled himself from his brief nap and all three of them dove toward their respective meals. Rin's tray had a smaller portion set aside for the Cat Sídhe and Rin set it on the floor for Kuro before picking up the tray and beginning to practically inhale his food. As he ate he glanced over to see that World End's tray was already empty, not a crumb left. When he and Kuro finished their meals he pushed the tray back out of the small hole under the door and made his way back to the bed. He noticed that World End was sitting on his own bed, clutching his stomach.

"You okay man?"

"So...hungry..." World End growled, his red eyes flashing as he rushed to the edge of the cell closest to Rin. His mouth hung open, revealing his fangs and Rin flinched back slightly. "No! No," the man seemed to scold himself. Stepping back, he bit into his right arm before gagging at the taste of his own blood. He fought the urge to vomit and then made his way over to his bed, laying down and facing away from Rin. He didn't speak for the rest of the night.