I don't own Hitman Reborn!

My second fanfic~! And I'll tell you here, I'm a Verde fangirl! He's so awesome, mysterious, cool, distant, and I like his mannerism in talking!

Summary: Slight AU. The Estraneo Famiglia was destroyed by the Vendicare. And they abandoned their projects and everything. Here comes our scientist Verde! He found an assassin project named Tsunayoshi. What will the Arcobaleno do? Ver27; implied R27.

Without further ado let us start~!

~Beyond Verde's Scientific Knowledge~

First Theorem: Double Persona of Tsunayoshi.

The news have reach Professor Verde's light ears. The Estraneo Famiglia, known as an experimental Famiglia, has been eliminated by Vendicare. The reason is: They have violated mafia's Omerta too many times. The news itself has no significant meaning for the green-haired scientist. But, Estraneo Famiglia has abandoned their experiments and researches. It is a good chance to enhance his research.

With that in mind, Verde leaves for the former Estraneo Famiglia ruins.

When he arrives on scene, the place is a complete mess like he expected before. He straightens his glasses. "Interested in looking around, Verde-sama?" Said a bandaged member of Vendicare. Verde chuckled. This place consists of nothing that can help him in his scientific research. "I wanted to take a look at Estraneo's projects." He stated simply.

None of the broken tools appear to be useful. He looked around and many people came to take the children. Some of the children are victim of human-trafficking, and their parents have been notified by the Vendicare authorities. Useless. He thought.

He looked around once more, and a mop of brown hair catches his attention. The scientist approaches the young brunette. The figure is slender, almost too cute to be a boy. He is leaning to a tree behind him, eyes closed. He wore a simple shorts and T-shirt, both of them are broken white in color. He stretches his hand to touch the young boy.

Much to his surprise, the boy reacted even before he managed to touch him. The boy grabs his hand with tight grip and points a knife to Verde's neck. Orange-colored cold eyes stare to the scientist's face. "Question: Who are you?" He asked in a monotonous cold voice. "I am Verde. A scientist." The professor is rather startled. Why slender arms like the ones the boy possessed able to exert this much strength?

"Quite the contrary, who are you?" The green-haired scientist asked. "I am Tsunayoshi, 27th participant of Estraneo Famiglia's assassin project." The brunette coldly replied. "Kora Tsunayoshi! Don't hurt a guest!" A crack of whip came and knocked the young boy unconscious. Verde caught the young boy in his arms.

"I'm sorry, Verde-sama. According to that thing's files, his parents sold him to the mafia to clear their debts. So, there are no possibilities for anyone to pick up this boy, unlike others, who are victim to human-trafficking that Estraneo Famiglia did often."

Verde slowly examine the boy and smirks. "I will take him with me. I am sure that he is going to be an important asset for my research." He slung the young brunette over his shoulder. "But, Verde-sama!" Verde coldly stares to the Vendicare personnel. "If he doesn't have any history as normal civilians, it is easier for me."

Without any word, the green-haired scientist left a young boy with him.

He returned back to his laboratory. His alligator, Sparks, greeted him. He put the boy he just found on the couch. Great, just great! This boy's reaction towards his touch is admirable. Verde took of the boy's shirt and find whip-marks embedded everywhere on his back. His front is no better, it has many shots marks.

Test-subject, there are no misses on his sounds. It shows that this boy didn't struggle if experimental drugs are injected on his body. But, the whip-marks on his back also showed the scientist that he did mistakes often. Verde change the boy's shirt with the green one he has in stocks. To tell the truth, Verde doesn't like to experiment on human. It can endanger his position in mafia charts, and it is against his principle.

When he proceeds to take off the boy's shorts, the brunette abruptly gets up.

"Hiiiie!"

The boy's body shivered from head to toe, certainly different than his first reaction when Verde approached him. "You…?" Verde asked. "I-I am s-sorry!" He touches his head, covering his face. "Are you the same boy I met this morning?" The scientist asked again. "A-ah! D-did I… kill again? T-this morning? I-I don't know what you're talking about."

The boy shuddered. Double personalities? Verde asked himself. "What is your name, boy?" The scientist asked, hiding his excitement beneath his curious voice. "Tsunayoshi… I go w-with the name Tsuna." He answered nervously. Verde petted his head. Interesting… He smirked.

"It is befitting, Tsuna."

"A-are you m-my Professor now?"

Verde narrowed his eyes and straighten his glasses. "Your Professor?" He asked. Tsuna nods. "Yes, m-my previous Professor is named Shamal. He is pervert, but otherwise, is kind." A sting of jealousy filled Verde's emotional system when Tsuna blushed and remember his memories of Shamal all too fondly. "I am Verde. I guess you can call me your Professor for now."

"I-I am looking forward to w-work with you, Verde-sama!"

An unfamiliar feeling burst in Verde's stomach. Tsuna's warm smile is something he never expects to have in his gloomy laboratory, where only Sparks and him as the living being. "You may rest again, Tsuna. Tomorrow is going to be a harsh day." Verde touches his forehead lightly. "Goodnight, Verde-sama."

Verde left the lounge and enters his main computer room. "Ciaossu," A man with fedora greeted him. "I don't remember ever giving you permission to enter my lab, Reborn." Verde ignore the figure and sat in front of his large computer. "The chosen seven-!" Before Reborn can finish his sentence, Verde's intentional loud typing noise gets in his way. "I told you I won't be Arcobaleno, or anything you want me to. I don't see the scientific benefits."

Reborn chuckled and polishes his gun.

"You got a new toy, didn't you, Verde?"

Verde stare coldly to Reborn. "Leave Tsunayoshi out of this." He said in the same cold voice as his stare.

"I wonder about that…"

Finished~! Please review~~! This is my first time writing with Tsuna as the main focus, I hope I got him right. And Verde too, I hope he's not OOC.

Bye-bee~!