Chapter 10: Final Beast

Natsu and Giotto were flying inside the mansion, opening every door they see as they keep their guard up. The mansion is too dark but not they mind at all. As they keep going, they heard a loud noise which alert them, pretty close too. The two took a stance, ready to the coming enemy which it appeared behind the wall. It was another chimera but a different type, already hurt and growling in pain.

"Chaos Shot!" Multiple bullets came that hit the chimera from all over its body that growled even more.

"That attack was…!" Natsu cut off as they saw the person responsible and it was Reborn who landed above the chimera and gave the last shot to its brain, killing it completely.

The brothers went to the ex-tutor.

"Reborn you were also attacked too?" Giotto asked as he studied the chimera that was now dead.

Reborn only shrug before reloading his gun, "So there are other chimeras too huh."

They heard a click of the gun from Reborn's, seems ready to move on.

Natsu then felt something as he took a position, same for Reborn and Giotto.

There, more chimeras are coming and now dashing to attack them.

Giotto glared, "Don't let any of this thing escape."

"Roger!" Natsu answered as he charge with his brother.

Reborn only smirked evilly as he began to shoot them.

On the other side, Iemitsu was running as he shoots and went down to dodge the tail. Fon was keeping it busy while Colonnello position himself before giving a powerful blow of his Maximum Burst, ending its life.

"Phew… just how the heck this thing is strong?" Colonnello said as he wiped his sweats.

Iemitsu on the other hand went to the dead creature and expect it. The chimera was different, cow body with haft of the person's body and alligator's tail. As Iemitsu looked on the person's figure clearly, he seems to confirm this person, a lady.

Taking the realization, he was really shock to know this, 'This person is…!'

"Iemitsu what's wrong?" Fon asked. Iemitsu stood up and clench his first, he answered, "This person is… the previous wife of the previous boss of Guerra Famiglia."

That shocked the two.

"W-wait, you mean that Romolo guy's mother kora!?" Iemitsu nodded to Colonnello's words.

"I didn't expect he will do this to his own mother… I'm sure Scarlet doesn't even know about this… Tch." Iemitsu turned to the Arcobalenos, "From what I remember from Scarlet, they have a facility underground. That might be the place where he is watching us."

"Underground huh… heh" Colonnello smirked to it, "Shall we make a short cut?" He readied his rifle, pointing the floor.

Fon smirked back, "I like the idea Colonnello. Do it."

Colonnello smirked even more before loading it. Ready to fire, "Maximum Burst!"

A powerful blast cause a large hole on the floor and the hidden floors were seen in total of five floors. Colonnello really liked his result. Iemitsu went to the hole and looked down to see it.

Iemitsu grin, "I like your way Colonnello. Let's go down."

Both nodded in response. Iemitsu was the first one to jump down, followed by the other two.

In the base where Romolo and the other scientist were, they were currently in panic, seeing that three of the enemies had gotten closer to their place.

"Wha-what should we do boss? At this rate they'll-"

"Shut up!" Romolo punched the scientist before turning to the others, "The other experiments?"

"The-they were all gone and rampaging the whole island. None of the experiments could come and take them b-boss."

Romolo twitch, "if that's the case, we have no choice but to release that thing huh."

His word shocked everyone at the same time tremble in fear.

"Release it" Romolo ordered but everyone was hesitating. He narrowed his eyes, "What's wrong?"

"B-Boss w-we all know that… that experiment is still incomplete! W-we don't know if that thing will listen to our orders." One of the scientists said.

"So you're afraid of his berserk huh" Romolo chuckle before turning to them in furious expression, "LET HIM OUT!"

Having no choice, the scientist had begun their work, releasing the incomplete experiment.

In Iemitsu, Fon and Colonnelo's position, they were currently searching around since the place since out of all places they had seen, this seems to be the most different one.

"Could this place be where they are doing their experiments?" Fon asked as he looked around.

Iemitsu gave a sad expression, 'I wonder how much pain Scarlet will feel if she learned that his own brother not only abuse her but also made experiment to their own parent's body.'

"Iemitsu thinking about the child again kora?" Colonnello asked. Iemitsu could only sigh before turning to them, "I wonder how will my daughter take this when she learned what happened to the child's dead parents and brother." He voiced his concern which made the two feel pity for the child.

"It would be too painful for her." Fon said in lone tone. Colonnello sigh, "Your right… but we don't have time to think about this right kora? What's important is to stop this guy, not only for Tsunayuki but also for her kora."

Iemitsu smirk, "Your right."

The three had finally made an agreement when they heard a growling sound that put themselves on guard and ready to whoever is coming.

Ahead, they saw the thing that actually shocked them. The creature is a monster, just how the heck this famiglia created such thing!?

Iemitsu glared at the same time grip his gun, "Let's finish this!"

Two Arcobaleno nodded as the three began to attack it.

Far from the place of the three, the brothers with their ex-tutor was approaching the place where the battle is taken place. As they do, Giotto was confirming things to Reborn, especially about their father. Reborn answered them which actually surprise them to know that it was their father who hated their sister so much was the one who helped her escape.

"I wonder what I should say when we meet Otosan." Natsu wonder in worried. Giotto stayed quiet as he felt the same as his brother.

They were still angry at their father after knowing what they had done to their sister, especially the reason why they never knew her from their very life but now… it feels like confusing.

Reborn on the other hand wasn't mind if he return back to their lives or not, because for him, he has no right to decide such fate. That will be decided by their family. He will support his wife, if Tsuna wish for him to return back it would be fine by him, as long as she is happy and so was he. As her husband, he doesn't want to suppress her own freedom and happiness after all. 'Now that I think about it, I wonder how will the idiot react when he meet my son, this is something I might come looking forward to see.'

As they kept going, they heard a loud explosion which made them alert. They continue to keep going until they saw someone smashed on the wall in front of them. That person was Colonnello.

"Colonnello!" Natsu shouted as he approached him. The ex-rain Arcobaleno was grunting in pain as he glare the thing they were fighting against, "B-be careful kora… that thing… is something kora."

The three faced it and shock to see some kind of monster they had never seen. Iemitsu was right now giving distraction as he shoot its face and Fon jumps really high to give a powerful attack on the unguarded parts which made the monster growl in pain. Still the pain inflicted wasn't enough to take it down.

"Natsu I don't know that thing but let's deal with it!" Giotto said before using his dying will flame to dash forward. Natsu stood up, "Okay!"

Natsu followed as he dashed his dying will flame.

"Burning Axel!" Giotto gave a strong punch with a strong dying will fist on the monster that made Fon and Iemitsu smirk. Although the monster didn't fall down. Natsu followed as his dying will consumed his right feet, "Burning Arrow!"

A strong kick at the same spot as Giotto's attack made the monster for the first time fall down.

Natsu grin while Giotto smirked. Iemitsu was about to yell some praise when he remembered something and hold himself back. He turned around, not wanting to face them but seeing them well for these whole years made him relief.

Reborn was observing from afar that made him pull his fedora and smirk. Colonnello only chuckle before standing up by using his rifle as his aid.

"Looks like you people arrived just in time." Colonnello said with a smirk as he glanced to Reborn. The ex-Sun Arcobaleno smirked back before turning serious as Leon turned into his favorite gun and pointed it to the monster who was now about to move, "Chaos Shot!"

Multiple flying sun bullets came out in just one trigger and hit every part of the monster that made it growl. This alerts the others that their battle is still not over.

The monster moved quickly was now behind the two bosses. Thanks to their intuition that they were able to dodge its quick attack and start their battle.

Colonnello immediately pointed his rifle and began shooting while Reborn gave a fast run forward. The hitman passed through the monster that the five making busy before seeing a small hole in the back of its ears. With his skill, Reborn easily shot and hit it which made the monster growl in pain as its body wave around.

Combine by the two brothers, they did the same move. "Zero Point Breakthrough: First Edition!"

"Exploding Dragon Fire Dance!" Thanks to Fon's attack that enveloped the monster's body, both brothers froze the monster until it no longer move.

The people were now relief, except the sky flame users and hitman. Suddenly the Sawada family felt something in their intuition, telling someone dangerous is coming. The ex-Arcobaleno's on the other hand felt it on their instinct that they immediately take themselves on guard.

They heard someone clapping that Reborn and Iemitsu pointed their gun on the clapping person while the rest take their guard up.

They saw the approaching person which made them glare, especially Iemitsu. It was Romolo Guerra, the Guerra Famiglia boss.

"Who is he?" Colonnello whispered to his comrades as he approached them. Iemitsu answered in low tone but venom one, "Romolo Guerra, the boss of Guerra Famiglia."

Hearing the name and the boss made them glare in full hatred, especially the hitman and the brothers. This person was the one who captured their beloved sister/wife and hurt her to the point she's near to death. They can never forgive him.

Romolo could feel their hatred and it made him glad they do. "I am so happy to meet you all. To even think that you were able to defeat one of my most masterpieces of creation… You all had done well."

They were now giving a venom aura, truly furious to this guy.

"Idiota, let me truly clarify this." Reborn's deep and venom tone asked to Iemitsu, "Is this person the one who had hurt my wife?"

Iemitsu answered in same tone, "He indeed is, don't take all the glory here Reborn even if you are her husband."

"So impatience" Romolo chuckle, "No matter, I'll just kill you all here." He showed an injection and inside is some kind of violet fluid. He had injected it to his arms, "Let's dance shall we."

He pushed the fluid inside his body and immediately his body began the changes as he growl in pain. They all watch as they could see the changes in front of them. Romolo change to new kind of being, a beast.

Outside, Conzart with his little brother Enma used their Earth Magic together to push down a chimera they are facing. When the Chimera was down, Enma felt some kind of extra ordinary force.

"Nii-sama did you feel that?" Enma asked to his brother. Conzart was confuse for a moment before suddenly he had felt it too which actually shock him. "Wha-what is this force?"

Inside the mansion in underground, Romolo who was now a beast had growl so loud that they could guess be heard from the outside as well.

Giotto glared, his hyper intuition is reacting danger and needs to be finish as soon as possible. Same feeling for Natsu.

"Gio-nii we need to finish this beast and fast." Natsu said. Giotto agreed, "Natsu ready your X Burner, after that I'll trap him with my Zero Point Breakthrough."

"Roger." Natsu with his dying will flame flew out, passing though the beast as the beast follow his sight on Natsu and was about to grab him when someone shot his hand. The beast turned to Iemitsu who had shot him.

"Don't think you can hurt my sons when I'm around." Iemitsu said as he glared the beast.

The two brothers smiled, seeing that their father still care for them made them happy.

'Now that I remember, the reason why Colonnello and Fon are here with him is because Tsuna had requested them to save Otosan huh.' Giotto thought. Natsu's thought continued, 'For that reason, we will answer her desire and come back home with her, where Caelum, Chrome and everyone else are waiting.'

Reborn began shooting with his gun same as Fon who immediately jump to give a strong kick. Colonnello used a role as an assistance for the two strong combaters.

Natsu finally got a good distance as he turned around and took his stance, "Operation X" A headphone in his ears spoke, "Understood Boss."

Giotto on his side began concentrating to use his Zero Point Breakthrough.

The beast growled as he caught Fon's feet when he was initiating his kick attack which actually surprise the ex- Storm Arcobaleno. Before the beast could throw him away, Colonnello shoot his arms followed by Reborn turning Leon into sword and cut the same spot as the ex-Rain Guardian shot that made it let go of Fon.

Iemitsu took the opportunity to burst his sky flame and in his first and jumped really high and punched the beast so powerful that made it slam on the floor.

Iemitsu turned to his twin son, "Do it Natsu!"

Natsu glared the beast as his preparation is ready. He released it, "X Burner: Air!" A blast of sky flame came out to his right hand.

The ex-Arcobalenos with Iemitsu stepped back and the blast hit the beast.

"Maximum Burst!"

"Exploding Dragon Fire Dance!"

"Chaos Shot!"

Combined attack hit the beast at the same time with the X Burner. Iemitsu could hardly smirk from what he was seeing. Unstop attacks and never letting a single counter from this guy, these people are truly wishing an end of this guy which he is no exception.

Giotto gave a finishing move, "Zero Point Breakthrough: First Edition!"

Giotto dashed forward to the flaming beast and froze him. Soon enough the beast was completely frozen.

Decimo took a deep breath as he stare at the culprit who had kidnapped, torture and shot his little sister.

Reborn glared the frozen figure, his instinct is telling it wasn't over yet. He may have no sharp intuition like the Sawada family but his instinct was truly sharp to the point he now trusted his instinct more than anything else.

Just as predicted, the ice began to crack which surprise everyone. Reborn pointed his gun as soon as breaks and growl.

"Chaos Shot!" Multiple dying will bullets in one trigger hit every part of the monster's body. The others immediately act as they charge and beat the boss. Iemitsu glared as he think, what should they do to finish it?

His intuition reacted and turned to the path that seems trying to lead him. Iemitsu gripped his fist before turning to everyone, "I'm heading somewhere to figure something out. Keep that thing busy." He didn't bother hearing their answer as he run ahead.

Both Giotto and Natsu actually felt the same thing like their father and was about to resort when Reborn spoke, "I'll go with him, be sure it won't bother us." Reborn run ahead, following Iemitsu.

Both brothers turned to each other before making a silent agreement as they with the remaining two Arcobaleno fought against it.

On the road, Iemitsu kept on running ahead when he felt someone is following him and it was Reborn. Both were silently running, until Iemitsu spoke.

"Are you following me to supervise me?" Iemitsu asked in serious tone but to the point demanding answer. Reborn was silent for a bit before replying, "Just wanting to help you."

The answer surprise Iemitsu, his eyes widen… why?

"My payment for rescuing my wife." Reborn answered as if he had read what he was thinking. Iemitsu looked down for a moment before smiling, "It wasn't really me… it was Scarlet. She asked me to rescue and help someone escape, I never knew it was actually her."

Reborn glance to him, as if studying him. There is pain, guilt and anger. It seems something had happened to this Scarlet, the only thing he could think was she had died.

"Scarlet is the younger sister of Romolo Guerra. She's actually abused and a complete broken child until I met her three years ago. Her warm slowly return which I'm thankful about, until that guy return with his captive." Iemitsu glance to him, "I'm sure you can already guess what happened next."

Reborn gave a thought before nodding.

Iemitsu took a deep breath before speaking, "This may be surprising to you but… let me apologize to you, after what I have done… especially to Tsuna."

"You had done it to protect her right?" Reborn said which actually surprising to Iemitsu. Did he know? Reborn huff, "We're in the dark world Baka Iemitsu, no matter what happened her life will always be in danger if anyone figured it out she posses an impure flame, how much more to Nono back then. I don't know what will happen if he had found out but it is actually a good decision you had make, not trusting him about this family matter."

Iemitsu was silence before asking, "When you first met her… is her flame…"

"Impure" Reborn answered, "She had kept all her pain and suffering on her own, creating a mask to cover them to everyone. I really found her interesting at that time so I decide to know her even more… until to the point my feelings change that I didn't recognize."

"So meeting you changed everything huh… I'm thankful to you Reborn." Iemitsu said in sincere tone. Reborn could only smile, "I'm really glad I had met her… I hate to say it but it might be because of you. I'm thankful."

Iemitsu smiled, "What makes you say that?"

"Who knows."

Both kept running ahead.

They soon arrived on the room where all the experiment started. There is a transparent room there where there's a lot of dead bodies and blood, it seems one of the experiments they had conducted made a havoc that killed those people.

There are papers scattered around as the two began their search. Reborn found out that their experiments were all about creating a perfect weapon where no human could kill. They used the theory of creatures in myth mythology to have their basis. They didn't even hesitate to use living human or even dead bodies, animals and many more.

Iemitsu is studying about the experimented files, hoping to find something that could stop him. In his end, he found something that made him gripped the files to the point it might tear apart. Curious, Reborn went beside him and see what he had found. His eyes darken on what he had seen.

It was a file on how they will plan on experimenting Tsunayuki. This truly angers the two.

"I'll Torture him until he experience the deepest hell he could ever imagine." Reborn said darkly.

"I won't stop you, I might as well help you." Iemitsu agreed darkly.

Soon enough they found the thing they need that could stop Romolo in his beast form.

"Let's return back Reborn." Iemitsu said. Reborn nodded as both run, heading to where their comrades fighting against the beast.

In the battle between the Vongola and the monster, both brothers were having a hard time fighting against it. Fon and Colonnello were doing what they can but everything turned to useless.

"Damn it! Dying Will Flame is working before, why not now?" Natsu grunted as he dodged the claw's attack. Giotto is thinking deeply, 'The more we use flame, the more it became immune to it.'

The monster attack and all they can do is dodged them.

Giotto twitched as he dashed forward to give a kick and hit. Still it is not enough to damage the now stronger monster. Everything is so fast that the monster smashed Giotto on the wall.

"GRAAAH!"

"Gio-nii!" Natsu shouted as he is about to go and help his brother when the monster immediately react and sway him away.

"GWAAAH!"

Fon and Colonnello dashed to attack but the tail swayed them away. The monster turned to the person he had slam within its grip, Giotto. He gave more weight that made him shout even more in pain. Giotto could feel being squashed, he can't do anything to escape.

Natsu wanted to help his brother but his body is too heavy to stand up. His Dying Will flame is already weak and about to be gone as well.

"G-Gio… nii…"

Both ex-Arcobaleno can't do anything either. They tried but their body refused to listen.

The monster seems to be enjoying to hear his scream as it was about to end his life when multiple bullets came and hit its arms that made the monster growl as it let him go. Someone also came in dash and took Giotto away from it.

Giotto cough for a moment before turning to the one who saved him and it is Iemitsu, his father.

"O-Otosan" Iemitsu smiled before putting him down to the safe place.

He turned around to see Reborn keeping busy on the monster. Iemitsu took something out from his pocket, it was some kind of liquid within the small tube. Iemitsu took another from his pocket and it was an empty bullet. He opened the sealed on the tube and put the liquid inside the empty bullet.

"O-Otosan… wha-what is that?" Giotto asked in weak tone. Iemitsu answered as he work on it, "We found this in his main laboratory. It is the thing that could stop that bastard and return him back being human."

Giotto was surprise. Everything done, he put it on his gun and pointed the monster. Taking the signal, Reborn used himself as a bait to distract it as Iemitsu focus on shooting him.

Iemitsu narrowed his eyes as he fully focused on the monster. In his mind, he could remember Scarlet's smile and Tsuna's forgiveness. 'I will revenge you two.'

Getting the decided target, Iemitsu didn't hesitate to shoot it.

The bullet with the liquid is heading to Reborn who is facing the monster. The hitman smirk before turning on the other side with top speed as the bullet pass through him and hit the monster's forehead.

The monster growled in pain so loud as it move around, trying to get rid something in its forehead but can't. Slowly the monster is beginning to crack and as it is destroyed, it reveal Romolo back to his original body, wearing pants and topless.

He fell on the floor, grunting in pain all over his body.

Even hurt, Natsu sat up, happy that finally it's over as the dying will finally disappeared. Colonnello and Fon sat up as they lean on the wall, finally glad that it's over.

Reborn studied on everyone and sigh, glad that they're not too late. Well not like he'll admit that to them.

Romolo is glaring, not liking the fact that he had lost to them. His dream, a dream to pay the world for making his life like this, for making everything around him, he won't let it, HE WON'T LET ANYONE GET IN HIS WAY!

Even in pain, he took his gun from his hidden pocket which made everyone turned to him. Leon immediately turned into gun as Reborn took it and shoots him but he's bit too late. Romolo already pulled a trigger before Reborn's hit his gun and flick away.

The bullet that Romolo released is heading to Natsu who has no more strength to dodge it.

No one could react immediately. Natsu closed his eyes, already knowing it will hit him but… nothing happened.

He slowly opened his eyes before it turned wide, not only him but also everyone else, even Reborn himself.

There in front of him is his father, Iemitsu who had protected him from it. They all saw right in the spot of his heart, bleeding.

This widens Natsu's eyes, even Giotto.

"OTOSAN!"

I do not own Katekyo Hitman Reborn