A/N: I really shouldn't be starting new fanfics but this idea has been in my mind for a while now. :(

Chapter 1

"Training? We're not here for a picnic?" Tsuna asked as he took in the surroundings. They were up in the mountains with Dino's men along and Reborn.

"We've traveled all the way to Japan to see my cute little brother," Dino said as he brandished a a whip, "so I thought I could pass down my whip handling skills to you."

"EH?" Tsuna shrunk back waving his hands furiously. "Er. Um. I don't think I'll need a weapon," he said weakly.

Dino handed his whip to him. "Have it. It's my old one."

"Dino-san's old whip..." Tsuna commented with awe. The Cavallone 10th generation boss might be useless without his men but he was really strong with his whip when his men were present. Like a blow hard cowboy acting tough in front of his compadres. That's why he was called Bucking Bronco Dino.

"Here try it. It's fun," the Cavallone boss said as he took out his snapping turtle, Enzio out of his jacket and uncapped a plastic water bottle, pouring the water onto the turtle. "First you put water on Enzio, the sponge snapping turtle."

"Eh? But if you put water on Enzio..."

"His size and aggressiveness varies on the amount of water you pour onto him," Dino explained. "He will be your sparring partner."

"Whaaat?" The snapping turtle which had once been small enough to fit the palm of Dino's hand grew larger but only to half the size of Reborn. Even though his size was not very intimidating, the spikes protruding from his back along with the speed he used to close the distance between him and Tsuna was scary enough.

"Don't worry, without anymore water, he won't grow any larger. When things get dangerous, my family will come and help you," Dino assured, hands in his pockets.

"Wah! He's pretty fast!" Tsuna shrieked, "HIEEK! Go away!" He waved the whip around randomly, smacking Enzio and sending him flying...

Dino grinned as Enzio sailed through the sky. "Hey! You have good instincts."

...Into a well.

"Hmm? Where did he fall?" Dino asked.

"That's a well," his men replied.

"...Well? Crap, Tsuna! Get away from there!" Dino and his family snapped into action as Enzio burst out of the well sending rock and debris flying everywhere.

"Uwahhhh!" Tsuna cried, standing right in front of the humongous snapping turtle.

It had been seven years since she had last visited Namimori. As far as she could see, things were still the same. The same buildings, the same streets, the same people. Nothing had changed much over the years. She made her way down the street and came to a stop as she reached the white wall with a bronze plate declaring the household: Sawada.

She grinned, anticipation buzzing through her body at the reunion with her childhood friend. She ringed the door bell and didn't have to wait long as Nana Sawada answered the door.

"Ah, are you one of Tsu-kun's friends? I'm sorry but he's not home right now. He got injured and is staying at the hospital for now," Nana explained.

"Mama, it's me, Hisagi Mahiro," she introduced. Of course Nana wouldn't recognize her now after seven years. Back then she was a short and pudgy six year old who was often mistaken for a boy with her short hair and the various bandages she sported, not to mention her incredible strength. Now here she was, seven years later, not at all like the little tomboy back then with her caramel colored hair now long and in two braids, and wearing a skirt. She never wore skirts in the past.

"Mahiro-chan!" She was quickly pulled into a hug. "It's been so long since I've seen you! You're so pretty now! How's Kiyomi-chan and the family?"

"Mom's in America for her job and everyone's doing fine. Masa, Mana, and Sumire are in college right now. Jun's on a school trip," Mahiro answered.

Her mother, Hisagi Kiyomi had been best friends with Nana Sawada back in high school and the two still were friends. Many times when she was younger, her mother had brought her and Jun over to play with Nana's son, Tsuna, who was the same age as Mahiro. They all got along well even though Mahiro would often abuse Tsuna, annoyed at his meekness. She never hit him too hard though and they always made up afterwards. You could say that they acted more like siblings than just playmates.

"My, my. It's been so long since I've last talked with Kiyomi-chan. Would you like to come in and have a drink, Mahiro-chan?"

Mahiro shook her head. "If Tsuna's in the hospital, I should go and visit him."

"Yes, that's a good idea. Just imagine the look on his face when he realizes that the Mahiro-niichan that he looked up to is actually Mahiro-neechan." Nana giggled. Younger Tsuna had never seemed to get it into his head that his best friend was actually a girl.

"Maybe I should bring a camera and take a picture."

Nana tittered behind her hand, near tears in laughter. "Have fun, Mahiro-chan! You should join us for dinner some time."

"Some time, Mama. See ya." She headed straight for the hospital. Before she got on the train, she'd already studied a map of Namimori and memorized all the streets and locations just so that she wouldn't get lost. She ran her hands down the wrinkled front of her previous schools uniform, and scowled self consciously at the mental image of her appearance. She hadn't had time to change out of it before catching a ride to Namimori. Luckily for her, all her luggage had been sent ahead to her new home so she didn't have to carry anything with her. Mahiro shrugged, deciding not to bother. It would get too late in the day now if she made a trip to her new house for a change of clothing. A sly feline smile crept over her dusky features; and now to buy Tsuna a get well gift. She mused silently, making her way down the street.

"This won't do Sawada-san! Please don't invite visitors who might seduce our nurses!"

"It's not fault they got seduced!" Tsuna cried. It really wasn't his fault that the nurses fell for Yamamoto's, Gokudera's, and Dino's looks. It was their own faults, really. The head nurse seemed to have her eye out for him and was at the end of her patience.

"If it were up to me, you'd be out of here by now. But at the request of a patient, you'll be sharing a room with him," the nurse motioned for him to follow her.

"Eh? I'm being moved again?" He thought he'd finally have some peace and quiet in the hospital but with Reborn and Dino and everyone else showing up, his hospital stay was anything but. But wait... a patient's request... who could it be? he wondered. Just what kind of person would request for him to be their roommate, having heard all the commotion concerning him from earlier.

A few more steps and the head nurse announced, "Here it is." She inched away from the room already walking away but without the same personality from earlier. She looked... scared? "So I will be... leaving now." And then the head nurse, for lack of a better word, scuttled away.

He ignored the nurse's strange behavior and opened the door to see a certain scary prefect in the spacious hospital room.

"Hey." Tsuna blanched.

"Hibari-san! No way! Eh! Why are you in the hospital!" exclaimed Tsuna who felt less well by the second because one of the scariest person he knew was staring him down from a hospital bed.

"I caught a little cold," he answered nonchalantly. "I was playing a game to get over my boredom, but everyone was too weak." Hibari sat on his bed wearing black pajamas, his hair messy. Lying at his feet were a few patients knocked out cold.

Tsuna turned even paler.

"What! What happened here?" Tsuna managed to stammer out as per his straight man role.

"I had my roommates join me for a game." Hibari's emotionless pale face held a faint sneer that Tsuna found terrifying. In fact, Tsuna felt his balls contract into his pelvis as Hibari continued speaking in a chillingly soft and sinister voice.

"The rules were easy." Out of thin air he pulled his silver tonfas. "If anyone made a sound while I slept, I'd bite them to death."

Scary!

"How one sided! How can this happen in a hospital!" Tsuna couldn't stay in that room. He'd rather be anywhere than there with the chance of being beaten to death by the head prefect of Namimori Middle school.

He backed away from the prefect and towards the door. "Um, I, I'm feeling better now. I... I don't need to be hospitalized anymore!"

"That's not possible, you'll need the doctor's permission." As if planned by the universe; the door behind him slid open to reveal an elderly man with a thin mustache and perfectly coiffed hair wearing a doctor's coat.

"Hey director," Hibari greeted.

"Director!" Tsuna asked stiffly, feeling his legs threaten to give beneath his weight.

"It's because of Hibari-kun that the hospital can run so smoothly. Sacrifices or whatever, we're at your command," explained the director, bowing quickly. WTF! He came in just to make this moment worse?Even the hospital's in on my cosmic misery!

Tsuna's jaw dropped, then he closed it himself. Hibari really had a lot of control around Namimori, Tsuna thought glumly.

"I'll be taking a nap then." Hibari yawned, flopping back into his bed. "By the way, even the sound of a falling leaf will wake me up."

"Wha-!" Tsuna jerked like a kicked puppy.

"Well, take care," the director quickly excused himself leaving Tsuna all alone with the scary prefect. Well, at least in here he'll manage to steal some peace and quiet to himself he thought. Tsuna was just starting to feel the knots of stress melting in the silence before the door slid open to reveal both Lambo and I-pin. Lambo pulled out grenades. I-pin activated her Pinzu timed super explosion. Before Tsuna could find the time to scream, his body moved quickly and swiftly on it's own divesting Lambo of his dangerous bombs, and as for I-pin...

Fuck my ass like a chicken pot pie!! Tsuna shrieked silently, while his body picked up the tiny child and ran down the hallway as fast as he could to throw her out of the window just before she exploded in midair. "Phew!" he said as he wiped the sweat from his brow. He entered his room again and gave a sigh of relief to see that Hibari was still asleep. Quietly, he crawled over to his bed but bumped into a vase and caught it before it hit the ground. Tsuna sighed again but his relief was short lived as a leaf from Hibari's flowers fell onto the desk, waking him up. "N-No way!"

"This is the room?"

The head nurse nodded. "Sawada-san along with another patient is staying here so please be careful, young lady. I'll be going now."

Mahiro watched as the nurse quickly scuttled out of sight. What was she so afraid of anyways? It couldn't possibly be Tsuna could it? Nah, that was impossible. There wasn't anything remotely intimidating about Tsuna that could instill fear like that in some one. At least not that she knew. She slid open the door, the well oiled slots making the action as silent as, well, Mahiro when she wanted to lurk(because sneaking implies a cowardly intent, and Mahiro tore the nose piercing out of the last yankee bitch to call her a coward. Not to mention, lurking was waiting in shadows, preparing to visit hell on the unwary and that was one of the favorite past times she used to indulge in, because Mahiro was trying to turn over a new leaf. And in a few years, she'll be tried as an adult) with that in mind, she moved further into the room and came upon a black haired male sleeping in the bed right across from her.

Mahiro sniffed, her dark eyes growing flat at the familar scent of dried blood and barely leashed violence. Her hands flexed at her sides, the thick discolored calluses over her knuckles stretching painfully. Here, she mused, here is someone interesting. Mahiro entertained a brief mad, blood-thirsty, desire to wake up this sleeping beast. To indulge in a balls to the wall, desperate fight that Mahiro just knew that this sleeping menace would deliver. Mahiro was already slinking forward, her heart beat drumming through her ears, hands loose and ready at her sides, ready to deliver a testing blow on this new challenging opponent. And then she sucked in a startled breath, air whistling silently through her bared teeth at the dry voice cutting through here and now.

"Dame Tsuna. You really can't stop causing trouble around the hospital can you?" She turned to her left to see a baby wearing a black suit and fedora sitting on a chair beside her childhood friend who was whimpering in pain, silently. Mahiro forced her body to come back from it's thrumming adrenaline high, forced herself not to bare her teeth like the beast that always stalked so close to the surface of her self.

Tsuna winced as he tried to sit up in bed. "It's not funny Reborn and be quiet or you'll wake up Hibari-san." He looked past Reborn to see a pretty girl with long golden brown hair braided into two thick braids, one hanging over her shoulder and one hanging behind her. She wore a black school uniform, the blazer unbuttoned revealing her loose green tie and tucked in white buttoned down shirt. She wore her skirt lower than the girls at Namimori. Where theirs were about three inches above the knee, hers were exactly one inch above and she wore long black socks that covered her legs. In her hands she held a gift basket of fruit.

She waved a little bit stiffly at him. "Hi."

Tsuna spluttered. It couldn't be could it? It was highly impossible, improbable for it to happen, but even so he asked the question not aware of the volume of his voice. "You're Hibari-san's girlfriend!"

The girl frowned.

Mahiro glanced at the other patient before turning back her attention to Tsuna, a cold smile on her face. She'd expected him to not recognize her but to call her someone's girlfriend? "You," she said. "Where did you even get the idea that I'm with that guy?" She pointed between herself and the guy lying in bed. "No good, Tsuna. It's been seven years and the first thing you do is say I'm some random person's girlfriend. You haven't changed a bit."

"Eh! D-Do I know you?" Tsuna asked. Reborn merely watched as the reunion unfolded.

"Can I punch you? Can I really punch you?" She set the basket down and cracked her knuckles.

As the strange girl neared, suddenly the scene felt familiar. Seven years ago, six year old Tsuna was lying on the ground, pudgy hands cradling his cheek, trying to keep his tears from coming. Another boy his age stood over him, hands on his hip, dark eyes boring into him. "Oi, stop crying. Boys aren't supposed to cry this easily. Do you want to be called no good all your life?" the boy asked.

"B-but, I can't help it," the Tsuna whimpered. The caramel haired boy cracked his knuckles, small grin on his face. "Can I punch you? Can I really punch you?"

"Ma-Mahiro-niichan!" Tsuna called out hands pointing at her. "But.. you're a girl.." he finished weakly.

"Oh, good you remembered. I'm glad I don't need to add anymore injuries to you. What the hell happened?"

Tsuna froze as Hibari sat up in bed, tonfas at the ready. "You woke me up again, herbivore."

"HIIIEE-!" his scream was cut off as Mahiro slapped her hand over his mouth.

She removed her hand when she was sure he wouldn't shriek again. She leaned against the wall, placing the basket on a nearby desk, sighing. "Tsuna is still Tsuna." She glanced up to meet the prefect's gaze. "Hiya there, mister. How 'bout you lay back down in bed and refrain from hitting anyone with those nasty sticks?" Mahiro tried for a polite smile, but at the way how Tsuna cringed away from her, Mahiro surmised that it was more of a snarl.

"The herbivores are crowding again," was all he said.

"Ciaossu," Reborn decided to interfere. The new character piqued his interest. Who was this girl who scared his charge and yet had his admiration?

"Baby," Hibari acknowledged. "Don't interfere or I'll bite you all to death." A strange fury was brewing in Hibari's stomach, his stocky hands clenching his tonfa's tightly at the blatantly feral smile the girl directed his way.

Reborn ignored the terse words."Hibari-san, put your weapons away. I want to talk to Tsuna's friend. I'm thinking of having her join the family."

"Ehhh! No, Reborn you c-" Reborn kicked an unsuspecting Tsuna, shutting him up.

"Shut up, Tsuna. I'm trying to talk here."

Tsuna could only mumbled out a weak, "Reborn..."

Mahiro bent down to check his injuries. The baby was merciless, kicking an already injured person. She whistled. Someone had done a number on him. Was he getting bullied again?

"Hn. Do what you want." The prefect made no move to put his weapons away, settling on glaring at the herbivores in his room.

The baby turn his attention to her and pointed a green pistol at her head. The girl didn't even blank. "Who are you and how do you know dame Tsuna?"

She cocked her head to the side. "How is it a possible that a baby can converse so intellectually? I'm sure you're only about two years old. Kids these days have such cool toys."

Bang.

"R-Reborn!"

The tip of the gun was smoking and the bullet that was shot was embedded in the wall behind the girl. The bullet had grazed Mahiro's cheek, setting a trail of blood dripping down her cheek.

"I'm the one asking the questions here," he said, blowing the smoke away.

"Mahiro-san, are you alright?" Tsuna asked. When was Reborn going to ever stop dragging his friends into the mafia business? Not anytime soon, he concluded as Reborn went on with questioning his childhood friend.

She wiped the blood away with the sleeve of her blazer, glad that her uniform was black and that the blood wouldn't show. But then even if it wasn't noticeable it would dry and cause the cloth to become stiff. Remembering the days earlier events, she took off the jacket and grabbed a water bottle from the fruit basket. Uncapping it, she poured it onto the coat and watched as pink liquid dripped down from it. There was more blood than she'd expected. "Oh, I need to get rid of this." She looked up at the baby, meeting his beady black eyes. "I'm Hisagi Mahiro, Tsuna's childhood friend. And you?"

"I'm his home tutor, Reborn." The baby smirked, idea forming in his mind. "Hibari, you can fight Mahiro here. She's partly the reason for waking you up from your nap."

"Eh?" Mahiro asked just as a tonfa slammed into the spot where her head used to be. She slid down against the wall before rolling out of the second tonfa's way.

"R-Reborn! What are you doing?" Tsuna spluttered as he watched his childhood friend avoid the attacks.

Out of nowhere, the baby had a cup of coffee in his hands and sipped from it. "It's her test to see if she's fit for your family. If she beats Hibari, she'll join the family. If she doesn't, then she dies."

"But I don't want Mahiro to be part of the family!"

"Too late."

Mahiro ducked and sidestepped the attacks again. It was a surprise that the prefect hadn't broken anything in the room yet, with all the wild swings he threw. All she wanted to do was visit her childhood friend but what does she get? A talking baby and a bloodthirsty patient trying to kill her. Mahiro disregarded the fact that she was planning on attacking the bloodthirsty patient in provoking him into a beserker fight just a few minutes ago. She had only just reconnected with her childhood friend, she didn't want to scare Tsuna into wetting his pants like she did when they were kids within fifteen minutes of their reunion. She eyed the door to the hallway for escape but quickly ruled it out as Hibari(that was his name right?) blocked her way. The only other way of escape was the window, which was several stories high. That was no good. If she jumped from this height, she'd surely die.

She twisted her body to avoid another attack before slinking her right leg behind him and sweeping his legs from under him. He lost his balance but quickly regained it and swung at her again, his attacks not letting up, if anything, the speed of which he swung those things increased as did the force behind it. She grabbed the black coat she had previously dropped and quickly put into action her plan for escape. She tossed the jacket at him, obstructing his view, and raced out of the door but not before saying goodbye. "Bye Tsuna, I'll come over for dinner tomorrow and then we'll catch up!" She slammed the door shut just as Hibari recovered and ran like hell down the stairs and out of the hospital not looking back.

She panted, trying to catch her breath. Lots of people had tried to hurt her before but not to that extent. He was really a scary guy with all the metal tonfas and the power he put into each swing. If she had gotten hit, she probably would've ended up the same way as Tsuna. But...Mahiro tested the strength in her wiry legs, a slow burning fury igniting in the pit of her belly. She balled her fists, the thick calluses stretching, he was scary. She acknowledged, and those metal tonfa's would've hurt her, but what was pain but salt on the meat of battle? She stopped running, and bit back a strangled scream of humiliation and frustration.

"Fuuck" Mahiro hissed. "If only Tsu-kun wasn't there, I would have pummeled his bones into splinters. Fuck! Fuck! Fuuu-uck!" She punctuated each fuck with a kick at the graffiti-ed wall. When the entire wall was reduced to a mess of rubble, and dust coated her unharmed leg and uniform like a mochi sweet, Mahiro felt calm enough to walk home and reminisce about her day.

Because today had been a day filled with excitement. Not only was it the day that she moved to Namimori and met Tsuna again but her old school had held a goodbye party for her. A goodbye party that didn't include drinks and snacks but fists, metal poles, broken bones, and ambulances. Tokyo was a funny place.

Mahiro sighed. She didn't ever want to meet that Hibari guy ever again. She'd dealt with enough delinquents and violent people in Tokyo, she didn't want to deal with that kind of stuff anymore even though she did love to hear the crunch of a noses and broken bones beneath her fist. Besides, if she didn't keep a low profile, the others would find her and complicate her life again.

She silently repeated that last over and over, ignoring how her thoughts keep drifting back to the fierce, merciless attacks of that Hibari bastard.

"I want to fight her again."

"HIIIEEE! H-Hibari-san!" Tsuna squealed. He was glad that Mahiro had gotten away but now Hibari wanted to fight her!

"You will," Reborn assured. "Congratulations, Tsuna. Mahiro is now apart of your family."

"But she doesn't even know about the mafia! How could you do this, Reborn! First you drag Yamamoto-kun, Haru, and Kyoko-chan into this and now Mahiro!"

The doors slid open as a furious head nurse stood in the doorway. "Sawada-san, this is the last straw, if you can't keep quiet you'll be kicked out. Come along, we're moving you into a new room."

"A-again!"

As Tsuna was hauled away by the nurse, Reborn remained and picked up the jacket Mahiro had left behind, it was still wet from the water she had poured on it earlier and her squeezed the liquid out, watching as the red water dripped. "Tsuna's got an interesting family member."

A/N: Care to leave a review? What do you think about Mahiro?