Hehe, much fun was had. Now we get to have a taste of what this little Oc of mine can do. Also, if anyone thinks about how she shattered the chains and whether that was a typo, it wasn't and shall be explained and detailed soon.

Enjoy this! It took a while. (Maybe think of really dramatic music when reading and think slow mo at points)(That makes it cooler)

(I am in a really weird mood ;P)

Enjoy!

Part I - Chapter III

Reborn was waiting for them at the front of the house, fedora low and a face of thunder.
"Are you all insane?" He asked them calmly, his voice too steady to be safe. In front, Tsuna felt a small shiver run through his spine and he nervously tried to stutter out.

"W-we j-just went out t-to get s-some breakfast." He mentally hit himself and felt Reborn scowl. The Ex-arcobaleno hated it when Tsuna stuttered. It was an old habit that had a tendency to pop up every now and then. The hitman adjusted his fedora.

"And I suppose going to breakfast entails visiting a ramshackle building that's partly alive?" They stiffened.

"You followed us?" Mukuro sniffed, slightly affronted that he hadn't noticed. Reborn shook his head.

"No. You all reek of mildew. Dame-Tsuna," said boy squeaked in fright as an evil aura surrounded the hitman, "Didn't I explicitly tell you to not leave the house?"
"W-well, yeah I guess."
"THEN WHY DID YOU LEAVE?"

The others watched as Reborn held out a Leon Hammer and promptly started smashing on the poor high school student. The others just blinked and realised dimly they were too used to the violence that trailed around Reborn and their Boss. After realising that Tsuna was semi-conscious and no longer able to answer, Reborn soon turned his interrogation on them. Gokudera, Ryohei and Lambo were sacrificed to the Hammer before they could get the explanation out with the unconscious/poisoned Hibari as proof. He temporarily halted his abuse session enough to help carry in the prefect and ring Shamal.

The Doctor arrived rather promptly (by his standards) and wearily checked in on Hibari, trying to ignore the sound of resumed abuse being dished out in the corridor.

When he exited, the others (who were in multiple stages of cowering) looked up expectantly and felt their bodies go stiff when they saw the puzzled look in his eyes.

"Poison, and a highly effective one. If we don't get the antidote, he's dead by tomorrow."
There was a stunned silence. Tsuna cleared his throat nervously.

"Do you have an antidote-?"
"No." Shamal cut in and the comment died. "This person is a professional. I can't cure it. You'd have more luck asking the person responsible for an antidote than trying to figure it out."

~()~

As the sun set over the city, the assassin sat quietly on the roof, her heart rate even and a slight smile on her face. The cat came up beside her.

"You're genuinely going to attempt an assassination during the day?"
"You have a problem?"
"Not particularly. I'll just be stiff afterwards, but it is for the best. You're out of time."
At the comment, black eyes went flat and empty.

"What do you mean?" The cat looked up and his steadily dilating pupils twinkled with warning and anxiety.

"I can smell it in the air. He's on his way and he's looking for you." The girl gritted her teeth and chewed on her nail.

"That's okay." The cat blinked, curiously. "I'll be finished tomorrow. He won't be able to do anything." She hugged her arms around her chest. "He can't."

~()~

On the other side of the town, a most demure aura hung over the Sawada residence. Reborn had left with Bianchi and Shamal to try and locate the girl and all the others were once again left in the house. Beside them, Hibari's labored breath made the air thicker.

"Are we going to tell Reborn, Tenth?" Gokudera asked nervously. The others looked over. Ever since they had returned, it was the first mention of their commitment the following day. Tsuna bit his lip than shook his head.

"We can't. He'll stop us. And remember what she said" he hugged his knees closer to his chest and Chrome rubbed his back reassuringly "if we don't do this, she'll just pick us off one by one. Taking her on all at once is the best possible plan of attack we could come up with."
"This fight will be extreme." Ryohei looked over. "Wouldn't it be wise to have Reborn as extreme back-up?"
"But then, there's a chance he won't let us go, and we lose any advantage we could have." Yamamoto added. On Tsuna's lap, Lambo made a small whimper and rubbed the ring around his wrist. It was still too big to fit on the seven-year-old's finger, so he was continuing the substitution. Mukuro leaned forward, for once a serious look in his eye.

"I suggest we distance ourselves from each other as much as possible and relax. This girl is not going to go down easily."

The following morning, the sun creaked over the horizon as a hit man and his company patrolled the skyline, looking out for any sign of a small girl.

In the Sawada residence, slowly the boss and six guardians prepared for battle.

Swords were sharpened, dynamite pocketed, tridents burnished. Tsuna grabbed his gloves and then they all exited the house. Snow owl and swallows soared above them, keeping a keen eye out for anyone watching. Small mammals crept through alleys on the lookout. They had decided on the location for the battle that night and steadily, they walked, the guardians flanking Tsuna, whose eyes had begun to burn with a passionate orange flame. A brunette jogger going past stared at them in astonishment before detouring in another direction and a lady wheeling a pram nervously turned back the way she came. A lone man in a fedora watched them wearily from the roof.

"Where do you think you're going?" He asked, as he pulled up in a car beside them. They all froze and Tsuna felt his cheeks flush.

"We . . . we were just going to-" the hitman sighed and the doors to the car opened, to the confusion of the teens. Inside, I-Pin was perched, Hibari lying beside her.

"Get in. This is the best chance you'll have to get her."

There was a moment of silence as they all stared at him, then . . .

"Get. In. Now."

~()~

Reborn dropped them off behind some old storehouses. Iron roofing and rough shelters were set up and huge frames held the storage containers. In the distance, an electricity plant, set up here to remove it from the residential area, poked above the iron crates. Behind them, the city seemed to fade away. They all filed out but just before Tsuna left, Reborn grabbed his arm.

"Be careful. This girl will not be like any opponent you've faced. She'll be fighting differently and for different reasons. And above all, don't forget this. She's tough."

Tsuna breathed in as he felt Reborn's presence leave, seeking a car space. The advice was becoming repetitive yet something wasn't right. It wasn't like his tutor to spout previously mentioned wisdom. He shook his head and turned to survey the chosen place of battle. They could fight safely here, without the worry of civilians coming. The words echoed. He had known. This could be their gravesite.

"So you did come." They turned, less surprised than the day before, to find her sitting on one of the containers. The ever-constant black cat purred contentedly, curled up beside her, watching them with sharp amber eyes, that twinkled with mischief and cunning. Tsuna turned to her and he felt the guardians press in behind him.

"So how do you want to do this?" he called across the industrious battlefield. She shrugged.

"I do not mind the method. You may talk strategy if you want." She picked up the cat and began stroking it. Tsuna turned around.

"So what do you think?"
"Overwhelm her."
"She doesn't seem liked one to be taken down by a simple trick like that, Stormy."
"Shut it, pineapple!"
"We could take her one at a time, like a progressive overload."
". . . how did you come up with that Yamamoto?"
"Like progressive overload in training."

"I like it Takeshi."
"Eh? Tenth?"
"Allow me to go first to the extreme!"
"Lambo-san will go next!"
"Everyone happy?"

They turned around. Seeing it, the assassin perked up slightly and put down the cat. Checking that his box was in place, Ryohei tightened the bandages and stepped forward.

"Your extreme opponent will be me."
"I see." She stared at him then spoke in that same listless tone.

"Ryohei Sasagawa, 17 years old, attends Namimori High School. Older brother to Kyoko Sasagawa. Sun Guardian and a boxer." She stood up and in a single fluid movement, leapt down off the container and faced him.

"You will die." Without a word, she charged. Ryohei stiffened and weaved, before sending an extreme right straight. She dodged and kicked out with her legs. He jumped back and charged in. Their fists caught, his left hook stopped by her right wrist. She flung it around, grabbed him and hurled him into the side of the container. He jumped up and smashed her in the gut with his fists. She flipped over his back, grabbed it and then slammed his head into the ground, turning a full backbend. All spectators winced. His hook caught her and she vaulted back, eyes watching. He got up and carelessly brushed rubble off before grinning.

"You . . . are an extremely worthy opponent." He pulled up his ring and his eyes glimmered. "YOU'RE BURSTING WITH PASSION!" the yellow flames ripped through the air of the ring and she bent into a crouch. The ring was inserted in the Vongola box.

"Mangaroo!" the yellow light filled and Ryohei's injuries vanished. His eyes burned with excitement. "Cambio Forma!"
There was a moment then Mangaroo glowed and Knuckle's Gear appeared. Ryohei grinned. She smiled.

"So this is a box weapon? How very interesting."
"LET'S BEGIN TO THE EXTREME!"

~()~

The girl easily dodged and weaved the blows and Ryohei met her fists. She used the landscape like a toy, vaulting and bouncing off walls, and she certainly wasn't playing fair. The boxer feverishly pounded on her but she glanced off the blows, often replying with trip attempts, wrist grabs or blinding maneuvers. Tsuna stiffened but Yamamoto grabbed his arm.

"Takeshi . . ."
"Leave them. We wouldn't be able to keep up."
"Of course not. I'm simply surprised that he's keeping up with my mistress' speed." As the long silky voice filled the air, there was a moment of silence and then they looked over to see the cat staring at them curiously. The gem on its necklace glowed.

"What?"
"THE CAT TALKS!" They yelled in sync and the feline sighed.
"I don't talk. My thoughts are being translated into sound waves by the aquanthine gem I'm wearing. Geez."

"Aquanthine?" Mukuro looked over suspiciously "That stuff goes on sale in the black Market for 4 Billion USD per gram." He caught the gob smacked looks the others sent him. "What?"
"Put it this way, man with pineapple styled hair." The man pouted and the others would have snickered in another situation without the sounds of cement shattering nearby every few seconds. "There are some people out there who are willing to pay quadruple that price to knock someone, they don't like that much, off." A black head nodded in the direction of the increasing rubble. "And she likes those ones the best." He stretched.
"You should all give up. You cannot hope to defeat my mistress."
Almost as he said it, the sound of blow matching blow sounded and they looked around to see the dust clearing revealing a panting and beaten up Ryohei and a still assassin. A small line of blood ran down her left shoulder and three bruises covered her body, but mostly, she was scot free of injury.
"How long have they been fighting?"
"Two minutes and fifty seconds." As they spoke, the assassin lunged forward and her elbow caught Ryohei's throat, sending him flying. She landed gracefully and looked up to see him pivot a landing and an extreme uppercut hit her solidly in the chin. The cat's spine went taught. The assassin's choked up blood as she was lifted bodily into the air when the extreme straight caught her in the chest and she was flung straight into the side of a storage container.

"Mistress!" The cat yowled. The other Vongola winced as part of the container started to fold in on itself, under the force of the assassin's impact. There was a creak and Ryohei stiffened, panting heavily. The entire container smashed apart, as if ripped by giant hands and the assassin lightly came out. Blood trickled easily down her back and a single drop wound down over her left eye, yet her face maintained the blank surface. The pain seemed inconsequential to her. She held up three fingers.

"Three minutes and two seconds. You have taken too long."
Tsuna's eyes widened. "The round. It's finished."
She almost smiled. "You're over." Before the exhausted man could react, she took off from a standstill and her hand clamped over his face. Momentum carried them solidly through the containers to the nearby electricity plant. His entire body was forcefully slammed into one of the poles, which broke in two. They all gasped as they felt electricity spike through the air. Her blow carried him through five more poles, out the other side of the plant and back into the containers, where he landed against one, instantly flattening it. Electricity lit up the shadows and spiked the air and the girl turned dismissively away from the motionless, broken body lying still in the rubble.

"The Sun Guardian has been neutralized" she turned to the others. "Who is ne-" she jerked back in shock as Lambo fell from above and landed on her back. His horns buzzed and then the air was filled with the assassin's screams as thousand of volts of lightning arced through her body. She desperately lunged from side to side, trying to shake the cow off but Lambo clung to her grimly as all the lightning he had charged up from the destroyed energy poles flowed through him to her.

"That amount of electricity could knock even Reborn out," Gokudera shuddered. She gasped and choked, before her knees crumbled and she fell limp to the ground. Lambo rolled off to the relieved cries of the others. Yamamoto grinned and Chrome flung her arms around Tsuna who grinned and stared at the limp figure of the girl. The smile disappeared and his blood ran cold.

"Lambo! Behind you!" The seven-year-old could barely look before a ten-centimeter thick iron pole slammed into his side and he was launched bodily through the air. His back smashed against a pillar and he crumbled, blood choking out and running down from his hair. The others backed up in shock, as the assassin extended her back to it's full posture and laid the pole over her shoulder.

"Well that's surprising. I didn't think I would have too use a weapon this early." Her eyes stared disdainfully at the small boy.

"Lightning shock, classifies closest to level 4 of conditioning. Threat: minimum. The Lightning Guardian has been neutralized." The pole glowed and she released it as it transformed back into her black cat, who curled up against her neck.

"Well, you should be satisfied now, Mistress. Shall we truly begin?" She held up a hand and the cat transformed into a hand gun. She leveled it at the stunned guardians.

"Yes. We shall."

Yay! That was so much harder than I thought it would be! Fighting scenes are hard . . . crying on M-chan's shoulder. M-chan promptly dumps Capulet on the ground

M-chan: Don't touch me

*sob* oh well, I'll get over it . . . soon. AND little black kitty functions in the same way Leon does! WOO!

Also, am off vacation! (Haha, why :'O)