Okay, so this is the first fanfic that I am (coughunwillinglycough) posting, so this might be a little horrible, but I guess it could be worse. Oh, & it's a joint fic with a friend of mine, so we'll be working back and forth hopefully we'll find all the errors in here. There is a lot of different languages used here, mostly for the word brother because I'm bored and felt like it would be fun to have two characters fluent in multiple languages (Honestly, I just got really bored of the English word brother). Lots of Mech on Human & Mech on Mech. Little bit of Twincest if you squint.

Prologue

Pressing against the convention hall wall, Keito hissed as he mentally muttered curses at the rude people forcing their way by. He may be dressed as the Undertaker, but it didn't mean that he had to act and force the smiles and insane thoughts continuously.

Fluidly slipping through the small gap that two people had left, Keito stopped by a pillar, out of the way yet still within the viewing area of anyone who might be looking for him. He was steaming from the inside out as the attitudes of many a person that he had met today.

"Kai?" Blinking when his bubble of dark thoughts was obliterated, Keito looked up, confusion set deep on his face as he looked for the source. Jumping when a set of hands grabbed his shoulders, Keito swung around, hands balled into fists in case it was another man thinking he was a girl. Again.

"Whoa! Easy Kai. It's just me." Snorting when Christian's pale, unblemished face came into focus, Keito allowed his brother to lead the way into a different area of the hall. Preferably without the waves rude people following them. Looking up at Christian's face, Keito held back a second snort as he saw the jet black hair framing Chris's face, instead of his usual dark brown.

"Lead the way, brother." Walking next to his older twin, Keito flicked the long strands of silver hair back over his shoulder, grabbing his hat before it tumbled off his wig and got trampled. He wanted nothing more than to take off his Undertaker wig, to free his shoulder length brown hair from the confines of the skullcap and remove his scar make-up.

Well here we are again,

It's always such a pleasure,

Remember when you tried to kill me twice?

Glancing up at Christian, Keito felt a smirk ghost over his face when he saw his brother's uncomfortable expression as a Grell cosplayer ran up to them, making the best impression of the love sick shinigami either of them had seen. Backing out of his brother's reach, Keito pulled his camera from his bag, ready to obtain more blackmail material on his sibling.

"Sebas-chan!" The glare he received from Christian told him of the payback he was going to receive later for abandoning him to the sharks. Waving the camera dismissively, Keito snapped the blackmail before his brother was released in favor for the Claude cosplayer jogging after an Axel.

Oh, how we laughed and laughed,

Except I wasn't laughing,

Under the circumstances I've been shockingly nice.

"I'm going to kill you one of these times Kai." Pouting up at Christian, Keito stuck his tongue out at the elder before stalking off, a stick of pocky hanging between his teeth. He could here Christian's shoes clicking on the tiled floor, trying to keep up with the brutal pace he was walking at, dodging between large groups and past long lines.

Turing sharply, Kai ducked into a small, shaded alcove. He may be solely dependent on his brother; it didn't mean that he wouldn't run off out of the blue on him either. Plopping down into his hiding place, Kai pulled out his sketch book, fondly flipping through the pages filled with different robotic figures and objects.

You want your freedom take it,

That's what I'm counting on,

I used to want you dead but,

Now I only want you gone.

"Kai?" Ignoring Christian's call, Kai stopped on a half finished drawing, pulling the pencil from the place it had been left. Pushing his sleeves up to his elbows, Kai pressed his lips into a thin line as he remembered what the finished character looked like in his mind. Between the two of them, he was the one who preferred drawing while Christian took more to acting and singing.

"Who is this one?" Glancing up at his twin, Kai sighed when he realized that he wasn't going to ever be rid of Chris – not that he ever truly wanted to be. Leaning against his brother's side, Kai closed his eyes for a moment, resting his eyes from behind the wig hairs brushing against his nose and the glass of his glasses.

Shaking his brother, Christian smirked when Kai groaned in annoyance at him. At least they were still on talking ground since his brother was still willing to groan and complain at his actions. He hadn't seen his brother's latest draws yet, and the one that the page was opened to was almost complete with no name on the page. Curiosity may have killed the cat, but it also brought it back.

She was a lot like you,

(Maybe not quite as heavy),

Now little Caroline is in here too.

"Knock Out. He's a Decepticon and the Chief Medical Officer. He's also as vain as the day is long, constantly buffing his armor and appearing new as possible." Adding the finishing touches to the drawing, Kai replaced the pencil and book into his bag. Standing from his cramped position, the brunette stretched out his cramped muscles. Holding out a hand to his black haired sibling, Kai smiled when their stomachs growled in unison.

"Come on. Let's go get something to eat. Sound good to you?" Nodding, Chris let his younger brother pull him up from the floor. Wrapping an arm around Kai's waist, Christian gave a soft possessive growl into his brother's ear when he caught the glance Kai gave to a scantily clothed girl.

Furrowing his eyebrows, Kai looked between his brother and the girl that had just passed them. He knew that Chris could get a little… jealous… but that was ridiculous. He was probably never going to see that girl again after the convention. Elbowing his brother in the ribs, Kai smirked under his wig at the surprised and pained grunt from Chris.

Served him right for being overprotective.

"Be nice." Kai admonished his brother as they headed to the main entrance of the convention center. They paused and maneuvered around pictures, only stopping when they were specifically called out too. They may have been hungry, but there was no need to be rude to other convention goers. It was against the rules of convention etiquette and they weren't too keen on the idea of having the same rude attitude shown to them anytime soon.

One day they woke me up,

So I could live forever,

It's such a shame the same will never happen to you.

"Finally! I thought we would never get out of there!" Snickering at Christian's exclamation, Kai readjusted his falling wig as they walked away from the commotion surrounding the convention and into the city itself, looking at the different restaurants as they did. They weren't picky on what they ate, not after some of the gruel that they had suffered through before, so choosing was going to take some time.

"What about there?" Pointing over to an oriental restaurant, Kai looked up at his brother to see if that seemed like a good choice. He really didn't care either way, but it did smell good from where they were standing. The strong scent of foreign spices wafting through the city air.

You've got your short, sad life left,

That's what I'm counting on,

I'll let you get right to it,

Now I only want you gone.

"Hmm… I don't know… I was thinking maybe something more along the lines of Italian." Shrugging, Kai looped an arm with Chris, the elder taking the lead. It really didn't matter what they ate, just as long as they ate at some point.

"You know… I really do think we should take off this make-up at least. People might think we have mental problems if we walk into a restaurant with this on." Pointing at the fake scar across the bridge of his nose Kai smirked when Chris laughed at the expression of insanity that he gave to make his point.

"Yeah. With the way you express things, they might call the cops on us." Sticking their tongues out at each other, Kai grabbed Christian's hand, lightly tugging his sibling in the direction of the crosswalk. There was a park near-by, meaning that there was a public bathroom close.

Goodbye, my only friend,

Oh, did you think I meant you?

"Come on silly." Pressing the button to change the light, Chris smirked as Kai rocked on the heels of his boots as they waited for the signal to cross. They were both hyped up on sugar from the ramune and pocky they had consumed earlier in the day.

"Yeah. As if you don't look as bad as I do. Niisan- koi." Glancing in both directions as the light flickered from a red hand to a walking stick figure; Kai smirked as Chris lingered on the sidewalk for a moment. Laughing at the dumb-struck expression on 'Sebastian's' face, 'Undertaker' took off across the street, the timer on the sign showing the seconds left.

"Come on Zwillingsbruder! You're going to get stuck over there until the next light change! " Shouting from the median, Kai smiled when Chris checked to see if anyone was turning before bolting across. Riling up Christian was a fun but hazardous if you didn't know how to do it correctly.

"Kai! Watch where you're going!" Dodging a speeding car, Kai stepped back into the median. Looking in all directions to see if there were any others flying down the street. Taking a cautious step out onto the asphalt, Kai took a glance up at the remaining time.

6 seconds.

That would be funny if it weren't so sad,

Well you have been replaced,

I don't need anyone now,

When I delete you maybe I'll stop feeling so bad.

"RUN!" Snapping his head up at the shriek, Kai froze as the black and white mustang sped at full speed towards him. Stepping on his cloak, Kai flailed his arms to try and keep his balance, failing miserably. Falling on his butt, Kai stared at the car in shock as he caught sight of something that he was so sure didn't exist in the world outside of his imagination.

The saleen mustang had no driver.

And it looked eerily similar to Barricade.

"Barricade?" Closing his eyes as his impending death closed in on his position, Kai crossed his arms in front of his face, a feeble and unmistakably human attempt to save his life. An effort he knew he shouldn't have bothered with. A car speeding at the over 100 mph would kill anything it hit. He could hear Christian screaming from the other side of the road.

Go make some new disaster,

"Fratele!"

Arms wrapped around Kai' waist, pulling him close. The momentum of the person's body tugging his along with theirs; his hat rolling off into the road. Rolling along with the unknown savior, Kai unconsciously tucked his head under the other's jaw. Grunting as they crashed into a wall, Kai and the stranger parting as they each rolled to their knees, gasping for breath.

"Jack! What were you-?" Tossing his head back, the wig readjusting to hang down his back instead of over his face, Kai looked up at the two teens that had run up to the male next to him. A long sleeves gray shirt and a pair of jeans covered the boy's lithe form. Jack tossed his head back, looking around warily with his gray eyes, his black hair moving in the wind.

A younger boy with brown hair and glasses wore loose jeans, a white button-up, and a plad vest stood off to the side, touching Kai's shoulder with a worried expression written over his features. A Japanese girl wearing a black t-shirt, leggings, a matching blue shorts and tank top had her back turned to them, snapping pictures of something on her phone. Her hair was pulled into two ponytails as well as a braid, and there were pink highlights adorning her pony tails and bangs.

That's what I'm counting on,

"No time! Miko! Raf! Run!" Squeaking when he was yanked to his feet, Kai stumbled behind the three teens, his heels making running feel unnatural. Shrieking when he tripped over his own feet, Kai released Jack's hand, not trying to slow his progress as he face planted into the sand.

Wait…. Sand?

"What? There's no sand in DC!" Scrambling up from the ground, Kai dashed after the trio of similarly aged teens. He may not know what they were running from, but he certainly did not want to find out the hard way.

Catching up with the trio, Kai turned to Jack, his face set into a serious expression to show he wasn't joking around when he said this, even if it sounded like the most ridiculous thing ever heard. He wanted to know when the slag he was and he was going to get a straight answer damn it!

"Where the slag am I? And don't you give me any piece of crap like Sector Seven sent you, 'cause all of you are way too young!" The surprise and shock on Jack, Miko, and Raf's faces told him that they didn't understand what he had said.

"You're joking, right? Jack just saved you from being squished by Breakdown and you're asking where you are?" Furrowing his eyebrows in confusion, Kai glanced back at the battlefield that they were running from and how it was steadily growing behind them. This wasn't the greatest time to be having a shouting match, but he was so fraggin' lost right now.

You're someone else's problem,

"What are you talking about? I was about to get run over by Barricade! A character that I designed! He isn't supposed to exist outside of my mind!" Miko, Raf, and Jack turned wide eyes to the stranger following them.

This was a disturbing turn of events.

"Who the scrap is Barricade? There's no Decepticon or Autobot by that name here."

"Did you say 'Barricade'?" A teasing voice sounded above the quartet. Snapping their heads up, the four teens gaped at the cherry red Decepticon towering over them, Miko snapping a few pictures on her phone.

Eyes wide, Kai nodded slowly, his mind slow to process what he was seeing. Knock Out smirked at the dumbfounded teen he had never seen before. He was quite cute either way, but he seemed to be very lost and confused. He was even yelling and demanding answers from the Autobot's humans.

Now I only want you gone,

"You are quite darling for a human. And you seem to be very knowledgeable about the Decepticons. I think that I'll keep you as a pet. What do you think about that, human?" Squatting down the humans' level, Knock Out gave the Autobot's trio of humans a glare that would have turned them into dust if it were possible. Scooping the new human into his servos, the boy not even trying to fight against his superior strength, Knock Out stood back to his full height as the trio below yelled and screeched at him to release their newest friend.

They had caused the destruction of his perfect finish. He wanted to squash them, listen to their scream of terror as they saw their doom rushing toward them. But now was not the time. The human in the dark, odd clothes had caught his attention. He was radiating power like he had never sensed from any Autobot, Decepticon, or human that he had ever seen.

"Get away from my Niewiele brata!" Glancing over at the source of the voice, Knock Out and Kai stared at the dark form of another boy dashing through the warzone, his swallow tailed butler jacket flapping wildly in his mad dash to their location. Even with the bangs of the black wig framing and hiding is features, they could see his look of anger, worry, and fright.

"Fratele cel Mare!" Growling at the interruption, Knock Out pulled a syringe from his subspace, injecting the mild sedative into Kai's bloodstream. He didn't want his newest specimen getting overexcited and hurt itself. Oh no, that wouldn't do at all.

"Decepticons! Fall back!"

Now I only want you gone,

"Otōto!" Openly gaping at Kai's limp form, Christian felt his heart freeze in place as his brother's last cry rang in his ears, the sheer hope and desperation filling Kai's voice when he cried out to him. Glaring at the Decepticon that held Kai in his hand, Chris pulled a small knife from inside his sleeve (AN: I couldn't resist. I mean, he's dressed as SEBASTIAN! XD), throwing it with all his might at the cherry red paint of the Con as a servo wrapped around his body.

"Let me go! I'm not abandoning him! I'm not leaving my brother behind! KAAAAAI!" Holding the enraged human close, careful not to squash or drop him, Optimus looked from his CMO to the boy in his servo, worry set deep in his optics. Pulling a needle similar to the one Knock Out had out of his subspace, Ratchet swiftly injected Christian, sedating the boy's rage for the moment. Wincing as Chris continued to thrash in Prime's hand, Ratchet commed the other Autobots to take their charges back to base while he and Prime waited for the anesthetic to take effect.

"No… Kai…" Collapsing as he succumbed to the anesthetic, Christian mentally cursed at he watched his brother being carried off in the opposite direction that he was heading.

He broke his promise of always being there for him…

Now I only want you gone…

AN, translation of the foreign words used:

Fratele : Brother, Romanian

Zwillingsbruder : Twin brother, German

Niisan: older brother, Japanese

Koi: Love, Japanese

Niewiele brata: Little Brother, Polish

Fratele cel Mare: Big Brother, Romanian

Otōto: Little brother, Japanese