Title: The Boy is Mine.
Author: Navigate Me.
Rating: T. Rating may go up.
Warning: Swearing, sexual innuendo, suggestive themes.
Summary: AU. And you thought an over-protective older brother was bad? Try an over-protective twin sister.

Chapter 1: The Beginning.

A/N: I am aware that Izaya may seem ooc, but I'm trying to make him as ic as possible, while still actually caring for his sister... I'm trying to make his relationship with his sister kind of like the twins' in Ouran, but without it being too creepy and, like I said, with Izaya as ic as possible... If that makes any sense. In my headcanon, Izaya is less experienced when it comes to relationships and stuff, while Shizuo is much more experienced, which means there will be a lot of scenes with Shizuo making the 'first move' and stuff. Heheheh. I'm sorry for starting a new fic, "orz. This isn't as serious as Substitutions and yeah

—-

It was silent. Not a thing was heard but the sounds of the busy city outside the window, soft, even breaths that belong to peacefully sleeping figures, and quiet drops of water that fell from the ceiling. The sun had begin to rise after a long night of heavy rain, that left puddles across the city that varied in both depth and size. They were inviting, and soon enough kids would be splashing around in them. There was a crack in the high ceiling, in the corner of the spacious bedroom. The leak was not large, but was big enough to give an entrance for some water to drip through.

Nestled in bed together, 6 AM, their raven locks bedridden and messy from tossing and turning, they unconsciously huddled closer together, savoring the warmth that the other provided. The nights were surprisingly cold, and with the heater broken, they had to find various ways of keeping warm without it. Whether it was wearing extra layers at home, or walking around with a blanket around them, it was no problem. They had shared a bed since they were born, so, even if the heater had still been running, they would've slept together anyways. Now, they had an actual reason to do so.

Like they actually needed one.

While she laid sound asleep, sporting a spaghetti-strap, black night gown that hugged her every curve perfectly, lying next to her, was him. Cool air mingled with his bare chest, giving him goosebumps. He mumbled something about ootoro under his breath. He was having a wonderful dream, eating his favorite food with his favorite person. Absentmindedly, Izaya had moved closer to the girl next to him. Their limbs were now tangled with one another's, and he softly groaned as sunlight hit his closed eyelids. There was an uncomfortable stinging sensation that left him seeing orange and red as he woke up, eyes still closed.

There was a tiny crack above the bed, and a small drop of water fell. It had hit her forehead, waking her up instantly. She blinked her large, sleepy maroon eyes open, and sat up as she gently rubbed them. She opened her mouth to yawn silently, and raised her hands above her head to stretch. There was a small crack that came from her back and she winced. Whoops.

"Noo… That's my ootoro…" His voice was like music to her ears, and she looked down to the sleeping male next to her with a fond smile. Her messy, dark hair fell down one shoulder as she leaned down.

"Wake up, sleepy head." Her soft, melodic voice floated through the air. Her warm breath tickled his ear as a small hand came to rest on his arm to shake him. He tried to shake her off, but she kept still. "You'll be late. Wake up."

"I am awake." He grumbled sleepily. He slowly turned over to face the opposite direction, as if ending the conversation at that. The warm, white sheets that once covered his upper body were then pulled over his head to cover him completely. He was awake. He just did not want to be.

"Izaya, get up." She poked his cheek several times. He raised a hand to lazily swat her hand away as she pulled away. A small smile spread itself across his pale features at the sound of her laugh."Haha, we have to go get ready for school now. Come on; up you go."

"Ugh…" He spoke through a yawn he did not bother to cover. "You go take a shower and get ready first; I'll go in after you."

"Fine." The bed shifted from under her slim figure as she crawl off the bed. Izaya felt cold instantly. His thick blankets failed to protect him from the chilly room, and he reached forward to pull back his most effective source of warmth. Izaya's hand wrapped around her small wrist loosely, and tugged weakly. "I take it back, come back; I'm freezing."

The raven opened his eyes slightly. "School isn't until 8:30. And it's what? 6:40?"

She smiled and placed a soft hand over his larger one ffectionately. "The early bird get's the worm?" It sounded more like a question than a statment

"You suck." Was all Izaya said, and he pouted. He watched her make her way towards the bathroom with another yawn.

Deciding he might as well make them some breakfast now that he was fully awake, he sat up tiredly. While she gathered her towel and things in the corner of his heavy eyes, for a moment, he thought to himself. What to make for breakfast today? Should they have their usual rice with side-dishes and miso soup? Or should he try to whip up something with a Russian feel? They had spent the previous night watching a Russian food network. The episode they had watched had focused on breakfast recipes, and he had memorized a few he found interesting while she fell asleep next to him.

"Hmm… I wonder if we have any olive oil…" He mumbled thoughtfully. Quickly, he rolled out of bed. The floor was cold, making him wince. But he adjusted to it, and lifted his arms above his head to stretch. He turned his back sharply, making it crackloudly.

"Cracking your back is bad for you." She said as she walked over to scold him lightly, towel, uniform, and clean underwear in her arms.

"My, my, you are such a caring sister, Kanra-chan." Izaya replied smugly.

"I know, right?" Kanra made her way towards the empty bathroom. "Now, go make us something to eat."

She began to skip into the bathroom.

"You're in an awfully cheerful mood."

"Is that a bad thing?" Kanra pouted.

"Who knows?"

"Hey!" Izaya snickered.

—-

"So, how was your day?"

"Boring, as usual." Replied Izaya in an indifferent tone. He dropped his moderately heavy schoolbag onto the black leather couch before dropping onto it lifelessly. When he heard her walk away to go into the kitchen to fetch them something to snack on, he reached forward for the television remote. The black device slipped from his hand as he reached for it on the coffee table before him, and cursed.

The raven turned on the large flat screen. He was immediately greeted with loud, auto-tuned singing with an equally loud, synthesized beat. Judging from the words, it was a Westen song in English. He changed the channel immediately, an annoyed scowl on his face. Regardless as to whether it was a Western or Eastern song, the song fell under a genre he was not too fond of. Just how could people listen to such mindless garbage? Did they lack the part of the brain that had the ability to differentiate the sound of a real voice from a computerized one? And that song. What in the world was a 'Super bass'?

"Awh, why'd you change it? The song was kind of catchy." Kanra placed a tray of chocolate chip cookies and two glasses of milk onto the coffee table. She snickered at the expression that washed over her brother's features, almost as if asking what was wrong with her. Motioning for him to sit up, he did as he was told and let her use his lap as a pillow. Giggling, she said, "I'm kidding, Izaya. Of course I don't like that song; it's irritating and gives me a headache."

He reached for a cookie and broke it in half. Izaya placed one half in his mouth, and fed the other to his sister, who took it happily. "I was worried for a second there."

"Abou'?" She mumbled, her mouth full of cookie.

"That my sister actually liked that song."

"No worries, Iza-chan." She reached for another cookie, and broke it into two halves like Izaya had. She fed him once piece as she placed the other to her mouth. "Can I ask you a question?"

"What is it, dearest sister?" He asked sarcastically.

"What is a 'super bass'?" Izaya opened his mouth to speak but closed it awkwardly, and shook his head, chuckling heartily. They were really like two peas in a pod. It was comical, how they were capable of being so alike without even trying.

"Who knows?"

Buzz. Buzz.

Turning his attention away from Kanra, who had begun to flip through the channels in search of something worthy of watching, to his school bag next to him, he unzipped it, and reached for his phone. A black, vibrating iPhone 5 came into view, and Izaya read the screen with lit eyes, and hidden excitement. He was calling. Izaya hated to admit the butterflies that welled up in his stomach, and quickly slid the arrow at the bottom of the screen, then placed the phone to his ear. "Hello?" His voice masked any signs of nervousness with a stoic, uncaring tone.

However, his sister had heard his voice waver ever so slightly, her ears perking up. She looked up at her brother curiously, a dark brow raised. Who was he talking to? And at this time? Everyone Izaya possibly knew was busy; she knew it for a fact, what with a school trip coming up. Most of them had been fundraising and going around selling chocolates, working at their jobs, and doing other various things in order to earn money for it. The Orihara twins would have, but Kanra and Izaya had been born into a wealthy faimly. So money was not a big concern of theirs at the moment. So, with the thought of earning money, who could he have possibly been on the phone with?

She suddenly heard a low voice emit from the phone. It definitely didn't sound like that Shinra fellow Izaya was friends with, nor did it sound anything like Namie. Her eyebrows furrowed and she sat up to place her ear next to the phone. "I see. Where did you say?" Izaya replied to the low, muffled voice. Through the corner of his eye, he saw his sister's figure move close to his phone. To her surprise, he turned away, and quickly made his way towards the door.

"Hey, Izaya? Where are you going?" Asked Kanra. Instead of answering her question, it had somehow been avoided. The way he waved his hand dismissively brought a small, concerned scowl to her pretty face. Ever since they were toddlers, she was always his first priority, just like how he was her first priority. So, it was safe to say Izaya ignoring her for the first time was a rather alien feeling, and a brand new experience. Like a quote she once heard, 'people cam't learn without experiences.' Or something like that. And she had learned something.

She had learned she really, really did not like the way he had ignored her.

"I'm just going out." Izaya said, and Kanra guessed she had not been completely ignored. But it was not as specific as she would have liked it to be.

"Well, when are you coming back?" She asked automatically.

"Later. Oh, sorry. I wasn't talking to you, I was talking to someone else." He turned his attention back to the phone. "So, where did you say to meet, protozoan? Russian Sushi? Okay, I'll be there."

Kanra watched as her brother opened the door, still chatting into the phone, and slowly disappear as it slowly slammed shut behind him. Kanra crossed her arms across her chest and pouted. They had done practically everything together. And going out was one of them. Even with friends; Izaya had always brought her to hang out with his friends and vice versa. For a moment, she contemplated staying home and watching some TV. But, with the growing desire to see what Izaya was up to grew to big for her to oppress. And so, she grabbed her bag, and headed towards the door.

"Hmm…" Kanra mumbled to herself. She opened the door and closed it behind her, using the key she kept in her bag to lock it. "I wonder where he went… No… Wait a second. He said he was meeting someone at Russian Sushi. Aha!"

—-

"Hey, I'm glad you made it."

He reached forward to place his hands on the other's hips, resisting the urge to let them drift any lower. With a small grin, he leaned forward, and placed a gentle kiss to the smaller teen's forehead, which resulted in a surprisingly dark blush to form on his cheeks. It made Izaya stutter, his hands finding a place on the other's chest instinctively.

"H-Hey, Shizuo-san, what was that kiss for? Why?"

Bleached blonde hair cupped his handsome features, falling just above his dreamy mocha eyes. The corners of his mouth quirked upwards, reveal pearly whites, an absolutely gorgeous smile, and a deep, hearty chuckle. The raven's eyes widened before quickly averting to the strong, shirt covered chest beneath his small hands. He felt his face heated up instantly. Why was he acting all love-struck like that? It was so embarrassing! All he did was smile.

"Hahaha, 'why?'" Shizuo asked through his laughter. "For being you. Why else?"

"Just wondering. Well, glad I can be here, Shizuo-san."

"Stop calling me 'Shizuo-san.'" Said male chided softly. "I thought we were close enough for you to address me less formally."

"But it's your name. What else may I call you, hmm? Would 'protozoan' be more suitable?"

"Grrr!" Shizuo pulled Izaya closer, and moved down to nibble at the other's ear, imitating the sounds of a growling animal. The raven laughed loudly into his chest, and made futile attempts to push him away. Anyone could tell Shizuo was much, much stronger than he was. But it was still cute to see him try. "So I misspelled my name once, that doesn't mean I'm as smart as a protozoan!"

"Sure. Sure." The blonde's hold loosened considerably, leaving enough room for Izaya to look up at him. "Then, Shizu-chan it shall be. How's that?"

"A little annoying, but at least it sounds like we're together now, huh?" He kissed the other teen's forehead once more.

Izaya's face turned scarlet. ""So… Why did you want to meet up?" He quickly changed topic, deciding it was best to just leave it at that. To his understanding, they were not actually together, or, as others would say, 'official.' Then again, what he had with Shizuo was the closest thing to a romantic relationship he had ever had, so this was definitely not his field of expertise. But still. His forehead was kissed once more, and he continued to blush red. The only person to ever kiss his forehead was Kanra. And, as of that moment, it was no longer the case.

"Do you need help with any homework?" Said Izaya, ignoring the rapid beating that was his heart, and willed his dark cheeks to return to the pale appearance it usually possessed.

"Not really." Shizuo's hands loosened on the other's hips until he had finally let go. Izaya moved his hands off the other's torso automatically, and the blonde took it as a chance to take his smaller hand into his. He laced their fingers together and watched the raven's fading blush reappear, darker than ever. Maroon eyes, that looked almost red in sunlight, looked up at him in nervous confusion. The blonde found it endearing on numerous levels, and could not resist the urge to press his lips to Izaya's.

When Shizuo's lips came within mere inches of his, Izaya quickly turned away, the other's lips connecting with his soft, pale cheek instead. The blonde chuckled once more.

Izaya was surprisingly shy, as reassured and full of himself as he seemed at school. In class, he was smug and blunt, sometimes talking back to teachers and correcting them, much to their dismay. Around their peers, he was bold and the center of attention. After all, how does one stir up as much trouble as he did without getting any sort of recognition? Pranking teachers every once in a while did seem to have that effect as well. It was something Shizuo admired about him. Not the trouble he caused, but the amount of confidence Izaya had to have had in order to pull it all off, and not to mention how incredulously smart he was. But, when they were alone, underneath all of it, was a shy, clueless guy when it came to things such as relationships and dating.

It had shocked Shizuo to see Izaya go his entire teenaged life without going on even one date. The numerous confessions he received on a daily basis were not shocking in the least bit, however.

Ever since Shizuo met Izaya in preschool, they had both had crushes on one another, starting from their very first day of Kindergarden, and continuing into their third year of high school. Izaya, surprisingly unaware the entire time, while Shizuo knew since the start of their first year at Raira, was shocked to find his feelings reciprocated. It was hard to believe someone as perceptive as Izaya could not pick up the subtle hints, glances, words, and 'accidental' touches Shizuo had provided. He even gave Izaya a special Valentine's Day card in the second grade! If that wasn't enough, then Shizuo did not know what was at that age.

"We've been standing outside Russian Sushi for a while now…" Said Izaya, pulling Shizuo away from his fond memories of his cute little raven, back all the way from elementary school. The raven leaned against the wall next to the entrance, eyes never leaving the taller teen's face. "Are we going in, or…?"

"It's up to you."

"What do you mean? You invited me here—It's up to you."

"To be honest, I just wanted to see you." He shrugged his large shoulders in an attempt to seem nonchalant. However, the light shade of pink that stained his cheeks said otherwise.

It brought a smile to Izaya's lips. "Oh? Is Shizu-chan starting to fall for me?" He teased with a rare amount of confidence when they were alone.

"Heh." Shizuo stepped in front of the small raven, moving a leg in between Izaya's. He placed his free hand against the wall next to Izaya's head, leaving him cornered and nervous. A mischievous smirk found its way onto the his lips at the sound of Izaya 'eep!' in surprise, and he moved down. The latter's breath hitched, and he held it for what felt like an eternity. Why was he so close all of a sudden?

"And if I am?" His lips barely brushed against Izaya's, his hot breath against his skin intensifying the situation ten-fold.

Izaya gulped.