Wow! Maybe this story is good, if so many people like it :) Thanks mates!

SakuraKoi: Here it is :D Thanks!

MonlightMiracle: Of course, every Monday! Thank you!

Rydia: Ahahah! You, uhm, in awe, maybe? Thanks!

Naomipy: As promised, on Monday :P Thank you!

Foxluna: Yep! Reborn doesn't know what's expecting him... Really, this is only the beginning xD I really hope so! Thanks a lot!

Wiccan: Let's face it, R27 is just cute, awesome and cool, right? Just... perfect! Thank you!

resunny: First of all, don't worry about your English :) I appreciate the reviews nonetheless and it's fine, anyway :) Ok, now... I got this idea of a plot while facing one too many fic about an abusive brother. I thought: Tsuna is just too kind and he deserves a good brother, but... Well, read to find out :) No, Ienari will not fight with swords. He'll have the same style as canon!Tsuna. You'll see :) It's just a backup story, details needed for the file and nothing really too important. As to the fact that Reborn thinks of Ie-kun as untrained... Of course he does. The boy obviously isn't trained in self-defence, Mafia altogether and etiquette, don't you think? We're used to picture the main characters in clubs as rising stars with talent, but Ienari is only a normal member, nothing too impressive, and Mochida a normal sempai :) Also, this story doesn't revolve around Ienari, but around... Well, many things, I don't want to spoiler anything :) Uhm... this chapter probably doesn't. The whole story is probably not what you readers think and, I repeat, I don't want to spoiler anything. Your only choice is to find out reading :) I have a feeling you all will like it *fingers crossed*. Oh, and yes, Reborn is an adult, I always forget some kind of tag, not used to them, sorry. Thanks!

Vongola: But of course :3 Thank you!

Words: 2703.

Enjoy!

03 – Lambo

Days passed by in a flash after the first one. Things settled down… someway. Reborn had a schedule, a… routine, as the older brother happily called it once.

The second day of tutoring, Reborn had woken up, dressed up swiftly in his suit, while checking with his hearing that Tsuna was already down in the kitchen, and used Leon-mallet on Dame-Nari at five in the morning sharp. The brat had yelled and opposed the idea of waking up early to go for a jog. A bullet embedded in the wall behind him and a bloody scratch on the left cheek had done the trick. The boy had grumpily worn a jumpsuit and Reborn had pushed him through the window. Tsuna had been watching from the entrance door with a smirk and a waving hand.

An hour and a half later, they had come back from the 'tour' around the forest and the mountain. Dame-Nari completely wasted, panting and on the floor in front of the house. Reborn, entirely calm and composed. Tsuna had opened the door just as they had come into view, wearing his uniform and carrying two bottles of… something. Turned out they were energy drinks that promptly gave strength to his student and they were two because one was for him. He had arched a brow at the proffered bottle, as if the object was rather offending.

"Not seeing it doesn't mean it isn't there."

Subtle. Reborn had taken the bottle and suspiciously sipped it. Not that he was expecting some poison or anything but… Better safe than sorry, as usual and as per his reputation, after all. The beverage was fine and fresh, with an after-taste of caffeine. And it did give him some energy. The smug smirk he received after the first swallow had been annoying.

After that, they had consumed the delicious breakfast. Surprisingly, the younger brother had had the energy to chit-chat with the eldest. Something about school, their outing, animals he'd seen, the best friend's last baseball game… Was Tsuna an older brother or a mother? Reborn was ready to swear, as he had processed the thought, Dame-Nari had glared at him and moved his chair towards Tsuna. Brother complex all right, but mixed with the Hyper Intuition flashing in his eyes… Kind of creepy.

He had skipped the rendezvous with the best friend in favour of establishing his position as homeroom teacher. Some pulls here and there, a bullet near the head of the previous teacher, game won. The face of Dame-Nari when he'd been presented as the new one had asked for a photo, taken by Leon secretly. Yamamoto Takeshi, still sleeping when the teacher, that had brought Reborn in, left, had woken up abruptly when his Leon-gun had shot a chalk on his head. A nice way to begin, considering he had established the complete control over each of the students. Few nice words to the love-struck female PE teacher and half his workload was taken care of. He only had to check, relaxing on the branch of a tree. Apparently, even the Prefect grumpily admired his efficiency.

And that was how most of the mornings went like, aside from the acquiring a job. The only thing changing was that, when he had no lessons or controlling to do, he went to the Librarians'. Those times, Tsuna was serving tables or helping in the library or doing paperwork somewhere in the back. A hard worker, to summarize.

The afternoons were a bit different.

On Mondays and Fridays, the students had classes. So, for Reborn, it didn't change a lot. But, when not, he took care of the heir's problems. Starting with homework, the hitman carefully honed the skills already present. The boy was quite good at math and the theoretical subjects, he just needed a bit of encouragement by Leon-gun to improve. What he apparently couldn't understand was chemistry and physics. Strange, considering that he was good at math. Reborn decided to use the last to help with the two and it worked. From the satisfied smirk Tsuna had sported when informed by his student of the successes, the hitman had started to suspect something had not gone smoothly with the previous teacher.

Aside from the homework, he started with Mafia-related subjects. Hierarchy, etiquette, Famiglie, allies and enemies, Vindice, CEDEF and, mostly, Vongola. In a month, he had covered everything the teen might need to know about his dark world. That didn't count experience, sadly. It had to come with the trials.

If time for dinner had not come by the end of the tutoring, Reborn didn't understand why Dame-Nari found it insane to train. Especially when the best friend and then candidate for a Guardian position was willing to help.

Speaking about Guardians…

Yamamoto Takeshi, Rain. The teen had already his deep relationship with the Dame. Reborn had found the boy interesting, with his keen natural-born assassin's instincts. Yes, a perfect candidate. There was still some darkness, though, in his sometimes-fake smiles. But his student had his Hyper Intuition to thank about that, Ienari always saw through it, he was however insecure about how to act. There was time, anyway.

Gokudera Hayato, Storm. He had already chosen him, after all. When he had come, around two days after his own arrival, Reborn had thought twice before using the Dying Will Bullet on Ienari. But the whole ordeal, on the roof of the school, had gone smoothly. The hitman might have or not hinted at Ienari that, truly, Gokudera was fighting for Tsuna, not only for the title of Decimo. Oops. The teen became a puppy, waiting and bantering with the candidate Rain in the mornings, after being defeated and saved by Ienari from…

Hibari Kyouya, Cloud. What to say… The Prefect was absolutely fitting and impossible to tie. He was strong and currently posed as the only one mentally and physically prepared for any situation or trial. The hitman had an idea on him. Blood-thirsty fighter he was.

He lacked a Mist, but those ones were hard to find and harder to tie. Not impossible like the Cloud, but almost. Slippery, that was the right term.

Bovino Lambo, Lightning. The brat was late, but he could see the 10-years old in the position without problems. Maybe he'd have to bet more on Tsuna's side, for this one.

Sasagawa Ryohei, Sun. He had met the boy on a morning jog after a week of stay. Energic, shouting, training, boxer. And older brother of the crush. Useful, too. Until it was involving the sister, the teen would do everything. A double cut blade, but Reborn trusted the Hyper Intuition on that and the natural acceptance of a Sky.

And speaking of flames…

Aside from the Storm's episode, Reborn had been careful. As Tsuna had conveniently said, Ienari's flames were not sealed. Following the helpful but threatening advice, the hitman had also added meditation in the evening, before dinner.

Usually, the meal was supposed to be eaten at 9 or 10 p.m., but they waited for the older brother to return. Those hours were used to meditate. The first time it happened, Tsuna had been surprised, but Reborn had caught on the apprehensive yet happy eyes. Worried for his brother's rest, pleased for having been considered as part of the family.

Of course, that was not the reason why Reborn did it every evening.

Nope.

But Ienari did it more obediently for that exact reason.

Saturdays and Sundays were spent outside, in the forest or in the mountains, for two-days-long training, with boxed meals for Reborn and, if the training had gone fine, for Dame-Nari, else for Leon.

The chameleon had taken a liking not only for the brunette's cooking, but for Tsuna in general. During his stays at the Librarians', Reborn often found Leon sliding to the teen and taking a place on the table near him, where he petted the hitman's companion, or directly on his head, gaining a smile and a pat. The assassin felt quite cheated, but couldn't really do anything about it.

Anyway, at their return from the training sessions, or, as Ienari called them in front of his brother, 'outings', they often found the house sparkling, the clean laundry in their rooms and a delicious dinner awaiting, while Tsuna was simply reading a book sitting at the garden's wooden bench.

Hard-worker he was.

"I still do not see improvements, Dame-Nari."

"Rebooorn, I'm tired…"

BANG.

"What did I say about whining?"

"T-that you d-don't l-like it…"

"I didn't stutter."

But Ienari was already sprinting towards his house. Their jog had ended. For the day, anyway.

As always, Tsuna was waiting for them with the bottles. What was unusual was the 10-years-old afro boy wearing a cow-printed onesie hiding behind his legs with a frown.

"Tsu-nii..?"

"Ienari, meet Lambo. He's searching for Reborn, but is currently homeless and running from home, so he'll stay with us." Tsuna smiled.

Reborn wanted to face-palm and hide a smirk at the same time. Ienari gaped.

"Tsu-nii, you can't just invite a stranger…"

The older brother's eyes sharpened. "Of course I can. And he's not a simple stranger, he's a child that needs help and an acquaintance of your tutor."

Reborn had thought right. And he had just discovered Tsuna had a weakness to children.

"Lambo has to defeat Reborn!"

Ugh, he had forgotten the brat's objective… He ignored him and took his bottle.

"Lambo." Tsuna knelt to him. "You don't need to, remember what we've talked about?"

"That… Lambo can stay?"

The other nodded, smiling and kindly patting him. "Exactly. Your family won't ever have a say in your doings anymore, alright?"

Oh. That was a hitman, Reborn mused. Tsuna glanced at him while Ienari was still trying to process what was happening and thus losing his chance to see his brother's true colours. Reborn mentally increased the weekend's training difficulty.

They went to eat their breakfast and the hitman noticed the plate for the cow was already empty and being filled again. Yes, mother-hen. He could almost see the eighteen-years-old Tsuna taking care of Ienari as if he was the mother. He should force the memories out of his student through training.

He silently enjoyed his meal while Ienari started bantering with Lambo over stolen food and Tsuna quietly read his reports. That morning, he had classes until 11 and then freedom. The PE teacher could be trusted about her rough methods. So, his plan was to go to the Librarians' and relax a bit. He had a feeling, though, that things would have gotten complicate, that day. Lambo felt like only the beginning.

"Stop it, you two." Ah, the Bossy tone, wonderful when Reborn needed peace or, the shop, a help. "Today I'll go enrol Lambo to school, the one near yours, Ienari." He assumed a hurt expression, that stopped whatever the Dame was going to counter. "I hope my example as an older brother has been good enough for you to know how to treat a younger one."

Hit and sunk. Reborn saw the emotions flash in his student's eyes. Surprise at the mention, regret at the implications, determination as the result. That earned Tsuna a lot of points. Good acting skills, but Reborn knew there was also some truth behind those words.

"Fine, Tsu-nii…"

"Ahah! Ienari is under Tsuna!"

"Of course I am! Oh, shut up!" He was blushing. "Tsu-nii, I'll go, don't miss work."

Tsuna smiled. "I can't make you miss classes…"

"Tsu-nii, it's better if you don't go missing from work, be it a few hours or more." He insisted, making Reborn curious. "Don't you remember what happened last time you did?"

Reborn sipped his coffee as Tsuna frowned. "I do… But you can't enrol someone to school, Ienari."

"Ehm… Well… No… But Reborn can!"

… Was Dame-Nari growing some backbones now? Reborn arched a brow as Leon let the lemon slice go and turned into a gun.

"What was that, Dame-Nari?"

His student fidgeted. "I-it was n-not an order! I w-was simply s-saying… The workers can't be left without Tsu-nii."

He looked at Tsuna, that was hiding a chuckle. "What happened?"

The other shrugged. "I found the shop half-destroyed… Apparently, some clients decided it would be fun to threaten a waiter. They don't take those well, so… A fight happened." He frowned. "They still refuse to tell me the whole story, but Katsu-san said to not think about it, so…"

"Katsu?"

"My Boss. Can you not play with toys when having meals, please?" Reborn wanted to scowl, but Leon morphed back. "Thank you."

"Fine, I will enrol him to school." He wanted to see that chaos, though.

Were there maybe cameras…

The smile he received from Tsuna was one of the brightest he had ever seen and the brightest ever sent his way. "Thanks!"

He tilted his head forward, but he had forgotten his fedora was on the table. So, he moved his focus on Ienari, that was having his internal debate. From the blinking eyes, he was confused. Maybe for Reborn obliging, for once. But the frown soon appearing told him another story. His student was not exactly happy with the outcome. Strange, considering he was the one suggesting it. Was the reason he seemed confused another, too?

"See, Lambo, you can go to school, now."

The cow grinned. "Lambo can make subordinates!"

"If what you mean is friends…"

"Friends?"

Tsuna folded his reports and smiled at Lambo. "Someone to talk to and rely on."

"Subordinates!"

"Fine then." The brunette chuckled.

Reborn, Ienari and an unsure Lambo left home before Tsuna. Apparently, the older brother had pierced the brat's heart in a matter of few minutes.

"Tenth! Good morning!" Gokudera bowed 90 degrees.

"Yo, Nari!" Yamamoto's smile was a bit off.

"Hi guys. Gokudera, don't call me that, I don't want to be the Boss."

"But… Tenth is Tenth."

Reborn just ignored the usual conversation and started walking towards the school. Before he could take two steps, the door of the house opened and Lambo ran to Tsuna, hugging him.

"Oof…" The hitman perked up and looked over the stone wall. "Lambo, it's only been five minutes…"

"I've missed Aniki!"

…. Aniki?

"Lambo…"

"Tsuna-san, good morning." Yamamoto bowed slightly.

The brunette nodded with a smile. "Good morning, Takeshi-kun. Long time no see… How is Tsuyoshi?"

"The old man's fine. Haha…"

"Good to hear that. I've been delaying but I think this Saturday I'll pass by."

"I'll tell him." Yamamoto smiled honestly.

Tsuna nodded, then looked at Gokudera, that was fidgeting, and at Ienari. "You didn't tell me you had a new friend." It wasn't an accusatory tone as much as a hurt one.

Ienari flinched. "Yeah, well… Nii-san, meet Gokudera Hayato, Gokudera, he is my older brother, Sawada Tsunayoshi."

"Nice to meet you, Hayato-kun." Tsuna smiled with a lifted hand.

Used to it, Gokudera shook the hand. "Likewise." Then blinked. "How…"

"Well, I can say you're not completely Japanese. You have a bit of a… occidental touch. Shaking hands is used over there when meeting a new person, right?"

The teen nodded shyly. "Not completely Japanese?"

"Your name. The one who named you must have had some kind of roots in here, right?"

Gokudera nodded again, sadness and warmth shining in his eyes. "Yes, my mother."

Tsuna patted his shoulder before looking at Yamamoto. "I'm leaving Lambo in your care, he's staying with us starting today. Reborn will enrol him to school. Keep an eye on him in my stead, okay?"

"Sure, Tsuna-san!"

"Yes…"

"Okay, Tsu-nii."

Reborn almost nodded. And then wanted to scoff.

"Thank you." He smiled, looking at his clock. "I must hurry, I wish you all a good day!"

Then, he ran off after freeing himself from the brat's hug. The hitman silently huffed when Ienari took Lambo's hand in his and started walking.

"Gokudera, my brother doesn't know about Mafia." He hastily said when Tsuna disappeared behind a corner. "Please, don't mention it when he's present."

"Of course, Decimo." He looked better at the brat. "However, you must know that the cow brat is a Mafioso, too."

Reborn counted till five, waiting for the kaboom.

"WHAT?!"

Damn brother complex.

Thanks for reading! See ya next week!