Buckle your seatbelts because this is the last chapter, people!

Thanks to the kind comments and get ready for some fluff

Maestri

Final Part

"You look rather confused, Sawada Tsunayoshi," the man with the iron hat stated lightly as he leaned against the Victorian window of the Japanese's office.

"Why wouldn't I be?" the young man retorted with a small frown. He ran a hand through his hair turned greasy and matted from way too many sleepless nights. "You appeared out of nowhere, while there is an army of guards protecting me, just to teach me about things so weird and impossible that they give me shudders. And all of this to save people that have long been buried?!"

"They are dead in this world, indeed," the stranger admitted with a thin smile. "However, nothing tells us that this knowledge wouldn't be of vital use in another world…"

"I don't have the ability to travel through worlds," the Vongola Decimo stated plainly with a tired voice. "That knowledge is useless to me."

"In this world."

"But it's impossible for this knowledge to go to my other selves!" the young man screamed as he slapped his hands over his desk.

Report sheets flew in the air and the man with the iron hat slowly waked towards the heavy breathing brunet. The latter looked dead tired from their chat as well as from the conflict with the Millefiore.

"Did you know?" the stranger commented as lightly as he leaned against the heavy wooden desk of the Vongola Decimo. "The Vongola and Millefiore rings come from the same materia prima than the Arcobaleno pacifiers do."

"What?" the young man said with a raised head, surprise going over his tired face. "What do you want to say?"

"To put it simply," the other told him with a shrug. "What was one once, can become it again. And I'll always be there to make sure that the Tri-ni-sette will exist.

The Vongola Decimo tilted his head and shook his lightly after a while, giving up all tries to understand those cryptic words. So be it, if that stranger wanted to teach him every secrets behing the Tri-ni-sette, he would learn them.

And if the solution to his problems was hidden there, he would use it without any hesitation.

When Reborn woke up, he noticed one thing. He was hot and something was itching his nose.

The hitman frowned and listened, making sure that there wasn't any danger. However, he couldn't hear anything, except for the wind and some grass rustling.

Reborn opened his eyes. And immediately widened them when he noticed some things.

The orange dome and their allies had vanished.
He had now the body of a twelve years old boy.
And Tsuna was lying in his embrace.

Reborn quickly put a hand over the brunet's neck and heaved a relieved sigh when he felt the reassuring pulse under his shaking fingers. He slowly put the unconscious teen down on the burnt grass and took a deep breath. It was only when he had leaned his head against his student's chest that he noticed something strange.

Tsuna had shrunk. Or gotten younger, whatever.

The hitman frowned, chastising himself to not have noticed something so obvious, and carefully looked over Tsuna's calm and slumbering face.

"So you were the first to wake up," a voice that Reborn had always hated suddenly said. "That doesn't surprise me much…"

Reborn quickly straightened his back, noticing at the same time that he was still wearing a black suit and that it was covered in mud. He checked his pockets to take out his silver revolver but was soon surprised by the touch of dry scales.

"Lean," the hitman whispered as he took out his pet which looked now like a real chameleon. "He survived."

A polite cough shook him out of his thoughts and Reborn immediately aimed his gun at the stranger's chest. However, thin wisps of indigo mist softly curled around the muzzle of his revolver and he felt his weapon become incredibly heavy.

"None of that between us," the other commented lightly as he massaged his own shoulder with his left hand whilst the right kept producing Mist flames. "I still have many things to explain to you."

"What things?" Reborn retorted as he reluctantly lowered his gun.

"The fate of the Tri-ni-sette," the man answered with a shrug and an amused smirk on his thin lips.

"What happened?" Reborn asked as he stepped in front of his student to better protect him.

"Tsunayoshi is a really interesting fellow," the other explain with a nod towards the boy. "No matter which world I met him, he never stopped surprising me… So I decided to teach him some things about the Tri-ni-sette, just to see if he could find another solution. And…"

The man drawled his last word and his brown eyes shone with affection as he looked over the sleeping boy. Reborn bit back a growl and crouched just to put a possessive hand over the brunet's chest.

"You don't have to worry about that," his interlocutor taunted him with a knowing smirk. "Tsunayoshi's solution has bested all my expectations."

"What was that solution, Kawahira?" Reborn hissed with dripping disgust over the fellow's name. However, on the other side, he felt the familiar warmth of pride towards his student fill his chest.

"To combine all the Arcobaleno's pacifiers into one," Kawahira told him with his eerie smile and calm voice. The adult took off his round glasses and wiped them clean with his kimono sleeve. "Because what was One once can become it again…"

"Then why didn't you do it yourself before if it was so easy?" the hitman fired back with clenched fists. "Tsuna wouldn't have become part of those useless conflicts if you had done so!"

"Because a soul ready to sacrifice itself to save the world was needed," Kawahira explained sternly as he put his glasses back on his nose. "That kind of soul is quite rare… Luckily for you, Tsunayoshi was ready to do anything just to save you."

"So," Reborn said as he unclenched slowly his fists and looked back at Tsuna. "There won't be more Arcobaleno?"

"Indeed," Kawahira approved with yet another nod. "As long as Sawada Tsunayoshi is ready to sacrifice his own life to save his loved ones, there won't be Arcobaleno."

Reborn furrowed his brows as he noticed a weakness in the Mist user's thinking.

"But," he protested, "what will happen when Tsuna dies?"

"And that's where the beauty of Tsunayoshi's plan lies," the other man exclaimed with a happy smile and wide handmoves. "As long as Sawada Tsunayoshi feels and wants to protect his loved ones, he shall live. He has become the exact opposite of the dear Bermuda Von Veckenschtein, don't you think?"

"However," Reborn stated as he folded his arms over his twelve years old chest. "If Tsuna truly is immortal, his family's loss should be enough to disturb him."

"And that's where I act," Kawahira cackled happily.

Reborn furrowed his brows and fought against his wish to kill the adult. He still had to understand everything that had happened to his student and past teacher. However, his hand caressed briefly the handle of his revolver, the present Tsuna had gifted him years ago.

"Imagine for a moment that all of Tsunayoshi's feelings are towards me. What would happen?" the other man asked him with an almost childish glee.

The hitman gritted his teeth and aimed once again his revolver to Kawahira's face. However, contrarily to the first time he did so, Reborn kept a calm face and answered the man's question without any doubt.

"I would kill you. No matter the effort or the time it would take me."

"And Tsunayoshi would do the same to me if I dared to touch a single hair of yours," Kawahira sighed with another shrug. "So I had to improvise and find another solution."

"And what was that solution?" Reborn asked calmly as he kept aiming at the other's brain.

The latter smiled and watched the two children in silence. On one side, Reborn, the hitman who had been the Sun Arcobaleno and who had been faithfully on his mentor's side even when he had been amnesiac. And on the other, Sawada Tsunayoshi. The child who had changed the Arcobaleno curse as well as the flow of time.

Kawahira's amused smile vanished and he started speaking, his voice echoing heavily in the empty clearing.

The adult leaned his head to the side and put it on his hand as he watched with curiosity the child who was squirming nervously on the bar stool.

"What is it, young Tsunayoshi?" the man finally asked as he closed his eyes with a lazy yawn.

The younger of the two jumped, he seemed to have been surprised by the adult's calm voice, and he raised his big brown eyes towards his interlocutor.

"I," the child hesitated as he bit nervously his lips. "I…"

The man softly shifted, raising his head and watching attentively the boy's tense expression before he put his two hands over the restaurant counter. The child looked at him in silence and ended up closing his eyes with a deep sigh.

"I want to make a deal with you," he ended up saying with a decided voice as he opened his eyes abruptly.

"A deal," the adult repeated suavely as he met the child's bright eyes.

The latter nodded and gulped loudly. He then put his own tiny hands over the counter and stared at the man.

"And what kind of deal do you want to make?" the latter asked with a tiny ounce of amusement in his voice.

The child clenched suddenly his fingers and drove his fingers into the counter wood with a harsh glare.

"You won't touch Him," he hissed threateningly.

The adult's lips shuddered briefly, probably fighting against an amused smirk, and he leaned his head towards the child.

"So be it," he accorded while admiring the determination in that youthful body. "I won't touch him anymore. However… what will you give me in exchange, young Tsunayoshi?"

The boy frowned and looked down, evidently thinking over what little good he could give to the immortal man that would satisfy them both. He bit nervously his lips and clenched his fists hard. Then, his eyes brightened before they turned orange.

"Anything," he declared without any hesitation. "I'm ready to do anything for him."

"So be it," the man repeated with a smile. He stretched a hand towards the boy. "I won't do anything that threatens his life. Deal?"

The child looked with mistrust the smiling face in front of him and ended up taking the stretched hand.

"Deal."

When he opened his eyes, the reassuring sunlight welcomed him. He made a brief moan of pain and tried to raise a hand to protect his tearing eyes while he curled instinctively over.

Then, when the tiredness finally left him, he remembered.

"Reborn!" he screamed as he stood up. His eyes looked around with a panicked gleam, taking in consideration the clearing, the green grass and the blue sky without a cloud to disturb it. However, the person he wished to see so much wasn't there.

"Reborn," he repeated with a quieter tone and while putting a hand over his aching chest.

Where was he? What had happened? Why was he alone? Didn't he succeed?

So many questions and yet no answer to stop the merry-go-round of interrogations that was circling in his head.

And then, the world brightened.

"Oi, No-Good Tsuna," growled a threatening voice that immediately warmed the brunet's chest and chased away the pain. "Speak quietly, I'm trying to sleep."

"Reborn!" Tsuna exclaimed as he turned towards the voice.

His brown eyes ended up on the body of a twelve years old child who was lazily lying on the clearing grass, a fedora over his face to protect it from the sunlight.

"That's my name," the boy grumbled as he raised his hat with a finger to glance at the brunet's surprised face. "Don't overuse it, No-Good Tsuna."

"Reborn," Tsuna said with a softer voice as he walked towards the other boy. "Your body…"

"Hm?" the child tilted his head and slowly lifted his chest whilst leaning on his elbows. "Not bad, right? I think I have the same age as I did during our first meeting…"

"But!" Tsuna protested weakly with an angry shake of his head. "You were supposed to be freed from the curse! Kawahira didn't hold his part of the deal!"

"To tell you the truth," Reborn cut him off and took his hands with an affectionate squeeze. "And even if it hurts me to say it, he helped us."

"What?"

The fedora wearing child heaved a sigh and hit his former mentor and student's forehead with his fingers.

"Stupid No-Good Tsuna," he muttered with a shake of his head and a loving smile. "You are still as slow as ever… Now listen well or else…"

The brunet let out a tiny scream of pain when he felt the flick and curled into himself when he heard the familiar threatening tone that his tutor always used before torturing him.

"I'm listening, I'm listening!" Tsuna screeched as he raised his hands to protect his face.

"Thanks to Kawahira," Reborn grimaced and looked disgusted to owe something to the Tri-ni-sette protector. "You won't have to bear all the weight of the curse on your shoulders."

"What do you mean?" Tsuna tilted his head, his eyes narrowing, and he lowered his hands before taking the hitman's, silently appreciating the familiar touch of gun calluses over his lover's palms.

"What I mean, No-Good Tsuna," the latter continued with a squeeze of his hands over the brunet's and with his voice taking an exasperated tone that was contradicted by the loving gleam in his dark eyes. "That this time, you won't be able to get rid of me."

Caramel eyes widened in surprise when he realized what Reborn was indirectly telling him, and Tsuna had to fight off heavy sobs that were rising up in his chest.

"I never…" he started before his emotions got the best of him. "I never wanted to get rid of you."

The fedora wearing child's lips stretched into an amused smile and he slowly leaned his forehead against the brunet's while holding the latter's gaze.

"I know," the hitman whispered as he relished their closeness.

A brief lapse of time went by and the two youth took it to enjoy their partner's new looks, avidly going over any detail that they hadn't noticed before.

"You were truly adorable at thirteen," Reborn commented lightly as he caressed his lover's cheek.

The latter moved his head a notch to keep the contact with the hitman's hand and furrowed his brows when he noticed something.

"Wait, I'm thirteen?!"

"Took you long enough to notice it," Reborn criticized with a familiar smirk.

"But why? Normally, I should have been forever fifteen!"

"You are wrong. You were supposed be forever at the age where you had been the happiest."

"Then why thirtee… Oh." Brown eyes lightened suddenly and a smile slowly stretched over his lips as he looked over the other boy. "I see," Tsuna said as he stretched a hand towards Reborn. "When I was thirteen, you arrived."

"And when I was thirteen, you came," the hitman added as his fingers slipped between the brunet's.

They kept silent once again and a soft wind rustled their unruly hair while the two cursed boy raised their eyes towards the blue sky.

"Now that I think about it," Tsuna commented idly with a tiny frown. "Where did the others go?"

"Oh, that," Reborn sighed while he ran a hand through his dark hair. "Kawahira created a barrier to leave us some… intimacy as a parting gift."

"Intimacy," the brunet repeated with disbelief. "At thirteen?"

"I have always been a precocious child," the hitman retorted with a smirk.

Tsuna laughed and hugged his former student and teacher.

"Prove it to me," he whispered to Reborn's ear with the ghost of a laughter in his voice.

Reborn merely took hold of the brunet's wrists and slowly leaned over until his lips met his prisoner's smile.

"Reborn," the boy with the bright eyes silently told him against his lips.

Reborn let go of Tsuna's wrists and ran his fingers through his lover's soft tresses.

"I love you."

Their fingers found each other and slowly intertwined to never let go of the other.

And that's a wrap! Thanks for reading and I hope this story was pleasing enough.