Author's Note:

Yo minna! Gokigen yo?
I don't know what happened to me. It's unbelievable a plot like this could come from me really. (sweatdrop)

Anyway, I'm not the type of person to talk too much. Just want to say a few things. Firstly, as I have noted on my profile, I'm from Indonesia so English isn't my native language. Therefore, correct me if there are grammatical errors. Secondly, I'm sorry if my story is suck.

[Updated! Thanks to NoobInArmor as my beta. And speaking of which, I found a way to upload files to doc manager yeay~ Can you read this italic? It means someone's inner thought.]

(Disclaimer: All of the characters together with Toaru series belong to Kazuma Kamachi sensei. I just borrowed them for this story. This story however belongs to me.)

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Railgun is a Boy!?

Chapter #1 A Certain Unbelievable Fate

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Academy City, with a total population of 2.3 million of whom 80% are students, is located in the western part Tokyo. The city also known for its latest technology is said to have a gap of 20-30 years ahead from anywhere else in technological and scientific advantages.

The students here would also undergo Power Curriculum Program allowing them to have an esper power. Academy City will then rank the student's psychic power based on a periodic System Scan which later divides them into six group, from Level 0 to Level 5, in which Level 0 being the weakest from having no power to Level 5 being the strongest esper in the city.

The difficulties of reaching Level 5 make it only so that seven Level 5s exist amongst the top of 2.3 million student in Academy City. They are known as Accelerator, Dark Matter, Railgun, Meltdowner, Mental Out, Number Six, and Attack Crash.

Being a Level 5 means the Esper is treated as one of the most important person in the city. They gain higher social status than everyone else.

Gaining this status will sometimes make someone become more arrogant and act like they can do whatever they want to do in a bad way. However, there's an exception for some of them. That's why the city's public images is Academy City's Number Three, also known as the Railgun or Misaka Mikoto.

The Tokidawai's Ace never seem to care about her image or her social status, choosing to act like any other normal girls.

Together with her friends, she has encountered many interesting adventures with some of them being dangerous ones.

But this one adventure was nothing she would have imagined to have happened on herself, all because of a certain perverted Teleporter.

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"KUROKO!" A scream could be heard throughout the entire Tokiwadai's 2nd Dormitory outside the School Garden in the early morning.

The source of the voice was obvious though, coming from Room 208 where the so-called Railgun and her junior spend their time together days by days while they're studying in the Academy City.

"For how many times do I must remind you our Dorm's Rules, Shirai?" The tall spectacled women spoke, with the unconscious figure of a student at her feet.

Behind the glasses woman was another student who we knew as Tokiwadai's Ace, Misaka Mikoto, the Railgun. The said person was now sweating-dropping, her body shaking in fear from the various punishments that flew through her mental eye.

The Dorm Mistress was now shooting a glare as a warning to the brunette who just stood there after seeing her roommate get knocked out with a simple neck twist.

"You must know this Misaka. Our school, Tokiwadai Middle School, is a prestigious school that is admired greatly by other students in Academy City. And as the one who stands as Tokiwadai's Ace, you are the centre of the focus of our pride. I hope you understand where you stand so as to not ruin our public image to the world." With that, the Dorm Mistress gave her one last glare, before closing the door of Room 208 shut.

After her leaving, Mikoto, who couldn't control her balance anymore fell to the floor. Letting out a long sigh, she thought about what the Dorm Mistress had said to her.

Of course I know... how could I not? But expecting so much from me... I'm just a normal girl too you know... She thought as an solemn look appear on her face.

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The next morning, Mikoto was seen walking side by side with her roommate, Kuroko.

"How's your neck? Does it still hurt?" The older girl asked her junior who had a slight grimace on her face.

"Do you still find it necessary to ask me that after seeing me treated so horribly last morning, Onee-sama?" The auburn-haired girl gave her senior an exasperated look, before continuing the massage on her sore neck. "And is there a need for the Dorm Mistress to go such lengths like twisting my neck?"

On the other hand, Mikoto only 'hmm'ed' at her junior's response, before taking a long swig from her juice —something she got from kicking a certain vending machine. Kuroko could only sigh at that, instead wondering how her Onee-sama failed to notice her lamenting over her misery last night.

"Nee, Kuroko…" Mikoto tried to come up with a new topic to discuss.

Kuroko looked up to the brunette, a simple 'hm?' escaping the tiny mouth of the Level 4 Teleporter girl as waited for the response from her senior. "What is it, Onee-sama?"

"It has been awhile since we hang out together, hasn't it? I just thought maybe since you and Uiharu-san have been working so hard on those Judgement cases and Saten-san with her supplementary classes, maybe we could just meet up, have lunch or whatever. It's not good for your health to be working so hard, you know." The Electromaster scratched her cheek as she spoke in a nonchalant manner, refusing to meet her junior's eyes as her cheeks tinted with a small blush.

Meanwhile, Kuroko could only stare at the girl, her mouth hanging wide open.

Mikoto sweat-dropped as she tried to shake the life back to her junior. "H-hey? K-Kuroko? What's gotten into you? Your face is like your soul has already left you behind and your body it starting become a statue."

A minute later, the said teleporter jumped in happiness as she suddenly teleported, making the victim – Mikoto – to shriek as someone appeared suddenly in her arms in a very intimate and misleading position. "Onee-sama~!"

"Cho-chotto, Kuroko–" Mikoto tried to balance the sudden weight in her arms while trying to shield her steadily redding face.

"For you to actually care about my health, ah~ Kuroko… Kuroko's heart is sud–AHHH!" Poor Kuroko, she couldn't finish her words as a sudden electric charge coursed through her body.

"If you ever did that again, I'll make sure I'm going to char you as black as charcoal so it would fit your name!" Mikoto shot a deadly glare at the twitching Kuroko. Can't deny it though, she was blushing madly at Kuroko's act.

"Ahnn~ To receive this love whip from Onee-sama… Kuroko is so hap-!?"

ZAAPPP!

Another electric attack —or love whip— was sent into a certain perverted Teleporter's direction.

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"Haaahh… Using my power like that seriously has a way to make me thirsty." The Electromaster complained.

"You just had a can of juice earlier, Onee-sama." Her junior deadpanned, rubbing her still dizzy head from her Onee-sama's special service.

"It's your fault so I have to use my power to somehow fix your broken brain!" Mikoto retorted in a tired tone. At the same time, her eyes caught something in the corner of the street. "Ah! Convenience store! You wait here, I will be back." And with that she left the poor Kuroko alone.

After her favourite electromaster was no longer in sight, Kuroko pulled out something mysterious from her school bag and grinned slyly at that thing. It looked like a normal capsule that one could often see in drugs store, but the look plastered on the teleporter's face could definitely change someone's mind.

I will make sure to teleport this thing inside Onee-sama's drink this time! She thought, drooling.

"What are you drooling for, Kuroko?" Mikoto asked hesitantly, no wanting no pry to much into that perverted mind of her junior.

"Nothing, Onee-sama~ Saa, since you've grabbed your drink, let's continue our date, neh~?" Kuroko immediately hid the capsule behind her back, before making the necessary computation to teleport the drug into her unsuspecting senior's drink.

"It's not a date!" Mikoto barked, tugging on her arm which was linked with the teleporter's. A visible pink tinting her cheeks as her outburst drew the attention of the passer-bys.

"Whatever you say, Onee-sama~" Kuroko merely gave her Onee-sama a small wink, before pulling Mikoto's arm closer.

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The morning after, Mikoto awoke to the sound of her roommate's voice calling her to wake up lest they be late for school.

Rather than doing so, Mikoto pulled the blanket over her head, growling lazily to her junior. "...five more minutes..."

At that, Kuroko sighed, knowing full well that Mikoto isn't a morning person, but staying in bed would only serve them more lectures from their Dorm Mistress. Suddenly an idea struck her mind.

"Alright Onee-sama, Kuroko will accompany you with your sleep for as long as you want~" She said as she teleported to Mikoto's side. Both of her arms slipped around Mikoto's waist before pressing her face against the Electromaster's back.

At the sudden contact, the older girl's eyes jolted open, blood rushing to her face, forming a deep blush.

Wh…what?!

Normally, Mikoto would have instantly electrocuted the teleporter into charcoal ashes. Yes, she would have but yet, her body remained in the same, stiff position.

What the hell is wrong with me!? Why I haven't electrocute her yet!?

"Ku-Kuroko! Get off of me now!" She shouted at Kuroko, trying really hard to hide her embarrassment.

"Ara? Aren't you enjoying Kuroko's body, Onee-sama~?" Kuroko said playfully, causing Mikoto to blush even harder.

Hm, is it already working? The teleporter thought while eyeing her Onee-sama curiously. Whatever the 'it' she refers to, it won't change the fact that it's something dangerous in so many ways.

"See? You even haven't electrocute me yet~ But Kuroko doesn't mind either to receive your love whip this early morn—"

ZAAPPP!

"QUIT IT ALREADY, YOU PERVERTED MORON!" Mikoto barked, unable to hold back the burning urge to give Kuroko some of her morning services.

"Seriously, what's wrong with your head and the perverted ideas?" Mikoto muttered as she got up hurriedly from her supposedly comfortable bed into the bathroom before Kuroko could see her steadily redding face.

Inside the bathroom, she couldn't help but look at her reflection on the mirror. Her face was seriously red.

What's wrong with me today... She thought as she cupped her cheeks.

Needless to say, her face felt really warm.

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After a few minutes of calming herself down inside their bathroom, Mikoto finally decided that she was ready to face that perverted teleporter. But the instant she opened the door, all she saw was a currently naked teleporter, with her body slick with lotion.

Mikoto stood in silence. Her hand still grabbing the door knob, her mouth hanging open from the shock, and her whole face growing tomato red from the sight.

After a few seconds of the awkward silence, Kuroko was the first one to speak. While on the outside she had her head cocked to the side with a confused expression on her face, inwardly, she was smirking like the perverted old man she was.

"Ara? Onee-sama? Why did you take so long in there?"

"… Wh-wha-" Mikoto stuttered, her mind still trying to compute whatever she was seeing while at the same time, trying to block out the various parts in which she wasn't supposed to see so clearly.

Kuroko continued to wait for the Electromaster's reaction to such bold action.

"What is it, Onee-sama?"

"WHAT THE HELL ARE YOU DOING, KUROKO!?" Mikoto shouted at the top of lungs, pointing her finger accusingly at her roommate. Electricity exploded from her bangs in Mikoto's failed attempt to look more furious than embarrassed.

But before either occupants of Room 208 could do anything else, the door slammed open, letting out a loud BANG!. The duo of the infamous room stiffened at the sight of their furious Dorm Mistress glaring at them behind those glinting glasses.

"Shirai." The Dorm Mistress spoke in a cold voice, the promises of many punishments laced in it.

"Y-yes, Dorm Mistress-sama?" Cold sweats rolled from Kuroko's forehead.

"Why are you naked here?"

"Y-you see, the sun outside is really bright. As a fine lady, I should protect my skin with this oil…"

"Oh? Can that oil protect your neck?"

"H-huh?"

Mikoto stood rooted to the ground and watched in fear as Kuroko stood there, unable to move an inch before the Dorm Mistress appeared behind her so suddenly that it looked like she could teleport.

In a blink of an eye, the teleporter collapsed into the older women's hands, her eyes rolling into the sockets as the Dorm Mistress glared at the Level 5.

Mikoto sweat-dropped as the Dorm Mistress dropped the unconscious Kuroko on the floor, before eyeing the other occupant of the room coldly.

Needless to say, the third ranked Level 5 was defeated by the Level 0 Dorm Mistress.

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A few days have passed since that certain incident, and Mikoto finally concluded that something was wrong with her body.

Whenever Kuroko acts all lovey-dovey around her, Mikoto found herself blushing uncharacteristically like a love-sick puppy. No more lightning attacks came out from her body, or to be exact, she found herself unable to focus enough to use her power. Her heart seemed to beat faster whenever she made skin contact with the junior, even seeing her from a distance caused the exact same thing to happen.

What's wrong with me? Blushing like nobody's business whenever she's around... Does it mean I'm becoming that kind of girl? N-no way r-right...? T-there's no I could l-l-like her that way! I-I mean s-she's always been my best-friend, n-no way I would fall in l-l-love with her or anything, right?

Mikoto shook her head furiously, trying to disperse the thoughts raging in her head. Right now, she was walking through the school corridor, her sudden action causing other students to turn their heads at her, whispering behind their covered mouths, wondering what the Railgun was doing.

After much thought, Mikoto decided that she would find the answer as to why she was acting so weird around a certain teleporter the next day, without knowing what the next day would bring.

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The next morning, the Level 5 woke up tiredly to the sound of Kuroko calling her name. Somehow her body felt so hot and her head felt so heavy. Sitting up on the bed, with one hand against her forehead as if trying to measure her temperature, she stiffened, feeling something weird about her body.

"Onee-sama, asa desu yo (trans. "it's morning already"). You didn't forget we have a meeting with Saten-san and Uiharu, did you?" Kuroko asked as she opened their dorm curtains, before walking towards the electromaster who still sat on her bed, a stiff expression on her face.

As she got closer, she noticed Mikoto's pale face, her open mouth and her wide eyes. Kuroko raised her eyebrow, curious as to what had happened to her precious Onee-sama. Is it happening...?

"Doushita no (trans. "What's wrong"), Onee-sama?" There was a moment of confused silence as Mikoto remains silent.

"Ku-kuroko..." When she finally spoke, her heart skipped a beat at the foreign, yet somehow familiar sounding voice that came out from her own throat. Almost immediately, a hand was clamped over the mouth, trying to stop any other words from leaving.

Kuroko also noticed the change in Mikoto's voice. "Onee-sama!? Your voice…" She squealed in joy silently, fully aware of what was happening.

Surprising both herself and the teleporter, Mikoto jumped from her bed and sprinted into the bathroom, locking the translucent plastic door behind her.

She pressed a hand against her chest in an attempt to calm her racing heart down, her mind noticing something wrong before she could actually pint-point it as she slid down against the door.

W-wait a second…

Mikoto swallowed nervously. Her eyes lifted from the ground, to her way-too-flat chest, before meeting those in the mirror.

For a moment, Mikoto could only stare at the mirror in confusion as her brain desperately tried to process the logic in her current situation.

When it finally did, she did a spit-take as her eyes widened comically. Wh-wh-what...

"WHAT THE HELL HAPPENED HERE?!" A piercing scream tore through the ear of the teleporter which before than had an ear pressed against the plastic door.

Pulling her head back so fast anyone would have thought she teleported, Shirai Kuroko's eyes glinted in unsaid happiness as she finally understood the situation, more-or-less.

Then she heard a loud thump!, like the sound of someone collapsing against floor.

"Onee-sama...!" Kuroko immediately teleported into the connecting room without hesitation.

Her bare feet touched the cold floor of the bathroom as she quickly flipped her Onee-sama over, her heartbeat racing faster and faster as she stared back at the face which could only stare back blindly.

Disregarding the whites of the Electromaster's eyes, Kuroko was very certain that the person in her arms is definitely her Onee-sama (Is it Onii-sama now...?).

Not only because she was certain Mikoto didn't wake up with the ability to somehow teleport, but also because the person in her arms looked exactly like Onee-sama.

The male had the exact tea-coloured shoulder length brown hair, cream-coloured slender thighs, slim yet deliciously athletic body and familiar looking chest.

If Kuroko's heart was not racing before this, it is definitely thumping hard against her chest now.

I have a chance now...!

Because today, Misaka Mikoto miraculously turned into a male. And in Kuroko's opinion, a decent looking one.

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An~~~~d~~~~ There it is, chapter one! More like a prologue though. I know this chapter is so short, but I want to save other stuffs for next chapter. Next chapter will be longer than this one anyway.

So, how is it? Do you like it, or not? I know this is a crazy idea, indeed. (rolling on the bed)