I do not own Hitman Reborn!

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.

God, Full Metal Alchemist DS game really pissed me off. Just finish already! AAAAAH!

Kurai Minoru Yeah, I've been thinking that when I wrote the second chapter. Everything is just too cute! Gosh and Verde's personality is something that will tire me when I write this fic, but anyways, enjoy! RanLei Good to know that you're reviewing again! I miss you~ Namimori? You'll see if Verde's going to be kind enough ~,~ Alucard-Nightroad89 I'm glad you enjoyed it! And Tsuna's Vongola heritage, eh? I didn't think about that. Thanks for pinpointing that out! You'll see *devil smirk* TakeshiYamamoto2980 Isn't he? Aw~~ Tsuna's too cute~ Glad to know that someone else love this pair! They need more love! the dream avenger18Really? I'm so proud! Verde's 'craving for knowledge' is very tiring. I have to google around and think like a scientist! And enjoy this chapter! ReaperofDarkness But you reviewed me now… That's so helping! :'D Reviews keep me going! And Ver27 is new… I know. But I can't resist the temptation; they're just too cute together!

Music When Writing: Gekidou - UVERworld

Without further ado let us start~!

~Beyond Verde's Scientific Knowledge~

Third Theorem: Hyper and Priorities.

"Intruder alert. Explosion detected. Confirmation of Dying Will Bullet commencing… approved. Commencing emergency fire extinguisher." The sudden notice woke our scientist up. Sparks clings to Verde's lap, and purrs. "Sparks…?" Verde put on his prescription glasses. Once his sights become clear, he notices a cushion-like thing on Sparks's mouth. "Are you telling me that Tsunayoshi is in danger?" He asked, feeling like a fool once again.

"Identify the source of fire." The green-haired scientist commanded. "Roger. Began scanning the laboratory…" The computer's blank made Verde anxious. First, his files… they're inside the safe, no probabilities of them getting burned. His animal experiments… inside the innermost biology lab. Nothing to worry about. "Location acquired. Fifth section's Lounge, book-section. Two Dying Will flames detected."

Verde realized what is inside the Lounge. Tsunayoshi is sleeping there! And the only one person he knows of uses the Dying Will Bullets… damn that Reborn! "Come, Sparks." Verde left his computer room with Sparks lurking behind him, following. No need to run, no need to run. He is simply a test subject, if he broke; I just need to find a new one.

"This guy, just who the hell?" Cold orange eyes stare to Reborn indifferently. "You… even Tsuna don't know you. A stranger. Shall I kill you? Or you are important friend of Verde's?" Reborn didn't catch his words and is too enticed with the boy's apparent change. From his bug's observation, he is supposed to be timid, shy, and klutzy. "I'm not Verde's anything. Dame-Tsuna." Reborn answered, trying to get a new reaction from the young boy.

"Perfect. I can kill you." Tsunayoshi's sudden move clears up the smoke, making him visible. He tried to punch Reborn on the face with his right hand, in which, Reborn blocked it with Leon-made sword. A silver glint can be seen from the boy's hand. "Brass Knuckles… how did you get it?" Reborn asked with a mild amusement. "Law of Assassin, section A, paragraph two, never leave yourself defenseless by not carrying a weapon." The brunette coldly replied.

Unfortunately, Reborn's left hand was free, and he punched Tsuna with that. Tsuna was pushed back and hit the bookshelf. He got up almost immediately, feeling no pain. Reborn would like to continue this party. But, Verde comes in with a lightning-class bullet reloaded gun. He points it to Reborn. "Back off, Verde!"

"Chaos Shot!"

The bullet split into two and Tsunayoshi immediately shields Verde from it. "I'd like to continue, Dame-Tsuna. But, I have matters I need to take care of. Ciao ciao." Reborn ran, and left the lounge. The orange-eyed boy looked at Verde, assuring himself that the professor is fine. "You are the boy I met that day." Verde concluded. He takes out his note-book and scribbles his new-found development.

"Who are you?" The scientist asked without taking his eyes off the notes. "I told you. I'm Tsunayoshi, 27th participant of Estraneo Famiglia assassin project." Verde scribbled this on his notes. "And, I would ask you to be more cautious. Tsuna treasures you, it makes me obligated to protect you." The professor stares to his test subject in a curious stare. "Tsuna? You talk like he is not you."

The orange-eyed boy chuckled. "No, I'm not Tsuna. Technically, I am him. He created me to endure everything, keeping him from breaking. Mind you though, we're different. Our personalities clashed, our eyes are different, and last but not least, our priorities." Verde scribbled this on his notes. Interesting… it is worth it bringing him here. He thought to himself.

The assassin touches his bleeding shoulder. "Then, what are you? And how about the difference in your priorities?" Verde asked without taking his eyes off his scribbling on his pocket notes. "I told you. Technically, I am him. Shamal tends to call me 'Hyper Mode' or 'Assassin Mode', and he also said that Tsuna and I are really different. Like earth and sky. As for our priorities…"

'Hyper' Tsuna touches Verde's chin and whispers to the professor's ear. "His priority is 'his important people'. Right now, it only consists of a person, and an animal. Namely, you, and your alligator, Verde. As for my priority, it is him. To keep Tsuna from breaking. You see how fragile he is, and I presume you can comprehend how hard my duty is…"

He lets go of Verde and clean himself of the dusts. "When he wakes up, tell him something good. Oh, for your info, it's useless to ask him about me. He only knows me as his 'scary-other-self'," He chuckled in amusement. "Honestly, I can't even think the reason why Tsuna is so adorable, so clueless. And he cannot remember his time when I was in control."

Verde is once again, in a loss of words. Tsuna have brought colors to his gloomy laboratory. While Tsunayoshi is an interesting species to be researched. Tsuna's slender arms sometimes aren't strong enough to bring a coffee tray. While Tsunayoshi's slender arms can exert so much strength, enough to break a person's bone. Verde never regret any decision he made. But, this is the first time he felt glad to have taken a person under his wing. The young brunette collapsed and Verde catches him. The lounge is half-destroyed. And he hasn't prepared Tsuna's bedroom. "Well, letting him spend a night in my room is not something of malevolent."

He carries little Tsuna in his arms, bridal style, heading to Verde's bedroom. A room he never uses ever since that room was built.

Reborn, a hitman, and an espresso coffee. A combination most mafia think is ordinary. Reborn sat down in a coffee shop, staring to the endless, starless night sky. His pet chameleon, Leon, walked around his Fedora. Leon is anxious. He took another gulp of the espresso coffee. The reason he was here in the first place is to convince Verde to be an Arcobaleno, in Luche's request.

Nothing else. Reborn convinced himself. But, that assassin's orange eyes have lured him into other things. It made him to actually envy Verde. Because the scientist was the one who met him first, and took him under his lab-coated wings. Of course, Reborn have seen the other side of the young boy. Stammers when he talks, trips a lot, low vocabulary, hesitant, and too shy for his own good.

Reborn murmurs, "Dame-Tsuna…" in light amusement. But… it suddenly strikes to him. That eyes, figure, and even hair… Leon transform into a cell phone. Reborn dialed a number he knows by heart. Connecting…

"Hello?" A crisp voice with an apathy embedded in it asked.

"Ciaossu. I'm in a bad mood now. So, I just tell you immediately." To think of it, Reborn is in a bad mood.

"Hold on, what's wrong?" That indifferent tone really contrasts with the voice's true intention. Reborn is used to this, though.

"Remember the talk about your missing brother? It seems that a jerk have found him." A jerk… it really fits that scrawny scientist.

"Wait a minute, my brother? Tsunayoshi?" Surprise concealed in the indifferent voice.

"Who else would I mean, idiot?" Reborn scoffed.

"Reborn, could you help me? Just… bring him to Namimori, to my reach…"

"Che, okay. I'll help you just in friend's terms. You helped me a few times too in past." Reborn hangs up.

He sips his coffee again. "Sorry, Lu, it seems that I won't be able to convince that Dame-Verde anytime soon."

This is… really awkward. Verde is the type of person who will sleep in his lab-coat. But, this time, he had removed his lab-coat and glasses. He replaces it with a pajama that smells like a metal wardrobe. He already changed Tsunayoshi's clothes with a spare pajama he has. Just the top part has covered Tsuna's body.

Tsuna is sleeping soundly without a care to the world. On Verde's bed. A bed he specially invented, in the same time, a bed he never used. Sparks is asleep on his couch. Verde is left alone in a silent room with a sleeping boy and a sleeping alligator. He felt really awkward, don't know what to do. He already read the books in his rooms. He felt so bored.

Verde laid himself on his bed, with Tsuna curling like a ball beside him. His face is reddened, and he concluded that it is because his cheeks needed more blood than he usually needs. He tried to think of a complex formula to help him drift to sleep. Pressures, gravities, and every theorem he could think of. Suddenly, a small hand touches his chest.

"Onii-chan…"

Tsuna's soft voice was trembling. Verde rolled himself to face Tsuna, he is crying. Unexpected! I have to be sure to remember this! Verde almost crawled out of the bed to get his pocket notes. But, Tsuna's small hands are gripping him tightly like it was his life. In short three weeks the scientist has spent with the young boy, he never saw the boy cry.

You see how fragile he is, and I presume you can comprehend how hard my duty is…

'Hyper' Tsuna's word echoes in his head. He knows… and that Shamal-person should know too that Tsuna is crying in his sleep. Verde run his hands to spiky green hair and sighed. Ever since the boy is here, he found it hard to focus. "O-Onii-chan…" Tsuna's shoulder tensed. He still stammers in his sleep. Another data gathered in Verde's head.

Onii-chan? A sibling? Questions gathered in Verde's intelligent brain. Just spending a night with Tsunayoshi in a same bed could gather a large amount of data about the boy. The young boy shivered. Verde read a book that says; almost all of children test subject will be traumatized. It seems that Tsuna is no exception. His mind wanders to one of a very few conversation he manage to strike with the brunette.

"Good job, Tsunayoshi." Verde petted his head like he usually did if the young boy did not struggle.

"T-thank you, Verde-sama."

"It has come to me, why do you never struggle if I intend to inject you?" He asked.

The young boy stares to the ground coldly.

"I-I have no rights to do t-that. The other kids w-who are s-screaming is a victim to h-human-trafficking. I-I am nothing like that. Because, m-my parents sold me. T-they knew that I was going to be t-tortured…"

That is the first time Verde ever feels sympathy. This boy is just behaving like he should, sold merchandise, a slave.

As for my priority, it is him. To keep Tsuna from breaking.

Even going as far as creating another personality, what kind of treatment did he receive in Estraneo?

Tsuna gripped Verde's chest in a tighter grip. He is shivering from cold, and from his own dreams, or trauma.

Verde feels sleepy and instinctively hugged Tsuna closer to his body. "At least, this will keep him warm…" And that was the best sleep Verde ever had in years.

Finished~! Aaah, I don't know if I've done a good job, so, please review~! Especially Reborn! God, did I get him right? And… can anyone guess who Tsuna's brother is? Well, it's kind of obvious -,- Aaah! I want Verde hugging me in my sleep too! Okay, I think I shout a lot here.

Your friendly fangirl,

~Chiri-tan