Disclaimer: I do not own KHR.

Time-travel fic. No parings. Parent!FirstGen and Child!TenthGen. Beware of grammatical mistakes.


Summary: When trouble starts brewing, you will find Tsuna and his guardians at its epicenter. This time, 150 years back into the past and shrunk down to kid-size - and there is a whoooole lot more at stake than just the existence of a single world.


"We're what." Caramel browns eyes growing flakes of gold searched beady black ones for any hint of a joke. Knowing Reborn, it may as well be one.

"We're going to Italy."

His Hyper intuition didn't detect a lie like he'd hoped.

Damn. They're going to Italy.

Tsuna pinched the bridge of his nose and sigh. "And why, do we need to go to Italy? That place is infested with mafiosi - no wait, it's controlled by the mafia - Reborn why?!"

"Nono's request." Reborn simply replied, showing the letter marked with Sky flames. "That's why Iemitsu is in Namimori. With you and your guardians gone, someone will have to be there to protect the town."

Tsuna mumbled something along the lines of 'of course it was work-related' before reluctantly leaning back in his seat.

He and his guardians have all been practically kidnapped and thrown onto a private jet the moment school ended (Kyouya was enticed with the chance of a good fight - or so Reborn said because Tsuna was obviously not going to fight the Skylark - and Mukuro went because Chrome agreed willingly) so even if he was absolutely against going to the country where mafia originated from, they were already several hundred kilometers above ground.

"What about school? And Kaa-san? Was she even informed of this?!" Tsuna started to panic once more. "Actually, is everyone's parents or guardians okay with us just suddenly -"

Thwack!

"Shut up Dame-Tsuna." Reborn left behind a footprint on Tsuna's face as he returned to the seat across from his student. "I already got permission from the school and all adults related to you and your guardians were informed that you won a lottery and will be going on a sightseeing trip in Italy."

Tsuna gaped. "And they're fine with it?!" (The fact that the adults, the well-educated adults, had believed that lie was an entirely different matter.)

Reborn slapped the permission slips in Tsuna's face.

"Where did you even get the passports?!"

"I prepared them long ago for occasions like this." The infant hitman smirked.

"You mean you planned to take us to Italy sometime in the near future?!"

"This summer actually."

"WHAT?!"

Thunk!

Tsuna evaded, just in time, of a steel tonfa embedding itself next to his head, on the head of the seat. That was enough of a warning for Tsuna to stop making noise like a herbivore or he may be missing a limb or two in the very near future.

(Honestly, Kyouya and tight space does not mix, seeing as how the Skylark was currently brooding in a corner far away from the group. At least it was still better than him taking up residence on top of the plane. Tsuna, no matter how scared he was of Hibari Kyouya, placed his foot down on the matter, going so far as ordering the latter to back down or else. Surprisingly, the Skylark had complied.

Tsuna didn't realized just how... persuasive he could be when he wants to be.)

Adding to that, Reborn, tired of his Tsuna's screaming and blatant complaints, threatened to shot him in the head. "If you don't shut up and go to sleep..."

"I can't sleep like this!" The brunet sallied back once more. It seem that the closer they were to the dreaded country shaped like a boot, the more his Hyper Intuition seem to buzz in dread and... anticipation?

(He wasn't even sure if his inherent ability of foresight was supposed to develop a personality...)

"Sleep, or I'll shoot you." Reborn threatened blatantly but knew that his student's mind was too jumbled up to catch some zzz's. Even so, Tsuna needed rest, and he wouldn't think it beneath himself to beat Tsuna to a pulp if it would get Tsuna to sleep.

After all, they got a long day ahead of them. (Reborn wasn't worrying about his student's mental state. Nope. Not at all.)


When Tsuna came upon the Vongola Mansion (it was, lo and behold, his first time there)... he was gobsmacked.

The driveway, by itself, was already the size of a football field with a sparkly marble fountain almost the size of a swimming pool smacked dabbed in the middle with flowers of every kind and color and perfectly trimmed grass and hedges around it. Let's not forget about the greeneries around the driveway people. Heck, Tsuna didn't even know trees could be shaped in those weird twisty ways with the details narrowing down to the leaf.

He now has his horizon widen in regards to the art of gardening.

The mansion (Tsuna was pretty sure 'castle' would be a better description) looked as though it came out of some fantasy book with its Victorian built that spoke of its legacy - and he wondered the likelihood of him getting lost in the damn five-story high by two football field wide building.

It was very, very likely.

"Are you trying to look like pathetic country bumpkin?" Reborn's snide remark broke Tsuna out of his trance. "You and your Family are going to live in this mansion in the near future so start getting used to it."

"What?!" Tsuna couldn't help but sputtered as he followed Reborn who was following the head butler into said mansion. "But - but - I didn't agreed to this!"

Just imagining himself managing this kind of monstrosity was enough to give Tsuna a headache, let alone picturing his violence-prone guardians smashing this place up multiple times. It was akin to them given a challenge of how long it would take for them to destroy their new toy and Tsuna very much would like to prevent that from happening.

"Again, no one cares."

Of course, Reborn just had to dump that cold bucket of watery reality over his head.

.

.

.

When Tsuna saw Byakuran and the former Arcobalenos all gathered in one place (He was quite surprised when most of them actually decided to work for Vongola of all places!) Tsuna knew that something was up.

And that something must be big if the seven (Eight?) strongest humans - even if they were no longer Arcobalenos, them having the title was proven by their area of expertise - in the current time wore such grim expressions.

Byakuran seemed to be fine but Tsuna's Intuition said otherwise so it only made things worse.

"Um..." The Decimo-in-training, his brows furrowing. "What's going on?"

"Tsunayoshi," came the aged-old voice that Tsuna had heard more often now than before. The brunet turned around and met the face of the person he was supposed to succeed... if Tsuna ever willingly agrees that is. "I did not expect us to have such a predicament at hand when I've asked for you and your guardians."

"Huh?" was Tsuna's oh-so eloquent speech as Nono and his guardians entered the meeting room.

"I had wanted you and your guardians to stay in Italy for an indefinite amount of time," The Ninth explained and continued before Tsuna could sputter his protests. "The danger to your life has increased significantly over the past few months that it's abnormal, Tsunayoshi. I fear for you and your guardians' well-beings so I decided that it would be safer to place the next generation closer to where all of us could reach at a moment's notice."

"Oya," Mukuro narrowed his eyes. "Aren't you underestimating our individual strengths a little too much?"

"As much as we appreciate your help, I have to agree with the Pineapple." The future Storm grumbled. "We have been handling those mundane threats just fine."

"Kufufu, what did you call me, Octopus?"

"Don't you dare call me -"

"Maa maa," Takeshi decided to interfere (Not helping). "Now is not the time to fight, ne?"

"Butt out Baseball-freak!"

"Kufufu, for once, I agree."

"That's not extreme at all!" Ryohei entered the fray. "Let's all settle this like real men!"

"Shut up Turf-top! No one cares about your philosophy!"

"Stop crowding or I'll bite you all to death." Hibari threatened from afar. He had just about to doze off when the annoying guardians decided to disturb the peace and quiet. The room was already crowded as it is (Even if it was quite spacious to fit about three classrooms in it, the cloud needed much more room than that) and if one more person enters that door, the prefect will take out his tonfas.

"Oya oya," Mukuro smirked, deciding to entertain himself with the Cloud. "Is it time for the Skylark's nappy time?"

And here comes the tonfas. "I'll bite you to death."

"Guys -"

"DAME-TSUNA, I'M HUNGRY! I WANT CANDY!"

Everyone else watched with silent amusement as Tsuna's family broke out into an uproar the moment they spoke. The Storm and Sun was having a shouting match while the Rain tried (and failing) to mediate, the Cloud and half-Mist broke into a fight (and destroying parts of the room), the female half of the Mist tried to quell a spoiled Lightning's cries, the Sky attempted to quell his family... And failing miserably of course.

It was always a show to watch whenever Decimo and his guardians were involved.

Bang bang bang!

"Enough of this." Reborn said darkly, Leon-gun pointed towards the battered chandelier that just happened to be within target. "You are wasting our time with your silly squabbles and you have caused more work for Nono." (Reborn ignored the fact that he was also contributing to the collateral damage but no one said anything. After all, he was the World's Number One Hitman.)

"AH!" Tsuna immediately went to comfort the sulking grandfather in the corner. "I'm so sorry grandpa! I'll - I'll make it up to you somehow!"

"Then take over as the Vongola don." Reborn suggested without skipping a beat.

"Anything but that!"

"Now back to the topic -"

"Don't just ignore me when you're the one who brought it up, Reborn!" Tsuna was, of course, ignored in spite of himself.

" - just like Nono said, the increase in hostile activities towards Vongola is abnormal and we can't risk the next generation to be in danger now of all times." Reborn stared down at each one of the future guardians, daring them to speak against him.

None were forthcoming.

"But..." He continued. "We, as in the former Arcobalenos, received a few... news that there's a crisis at hand a few days before."

"... what crisis?" Tsuna asked warily, his Intuition throbbing that exact same throb that he had for the past few days. Upon hearing that there was trouble, everything just clicked that something horrible was - will be - going on and he and his guardians were going to have to get involved.

He didn't like the very idea of it, but his Hyper Intuition was agreeing with his dreadful hypothesis.

"First of all," Lal took over from Reborn. "Vindice, or the be more specific, Bermuda was attacked."

.

.

.

"What?!" Tsuna's screech was the first to penetrate the pregnant silence that had followed after the bomb of the century. The simple sentence alone spoke volumes of the complications involved when the Vindice, the invincible fortress of the mafia, suffered from an attack.

"Did you just say..." Hayato said in a daze, not really sure if he was hearing that correctly.

"If you don't believe us, then you can read the letters that we received a few days ago, kora!" Colonello picked up and as if on signal, each of the infant fighters took out a piece of paper. It was blank, but when lit with Dying Will flames, words began to form.

"An unknown group of attacker," Lal added grimly. "Our men from CEDEF did an investigation before this meeting but what we came up with were residues of Dying Will bullets being used."

That, in itself, has a lot of implications because Dying Will bullets were rare and Vongola has always been the one who had monopoly over the supply. However, Tsuna knew that there were other Famiglias who managed to get their hands on some and were researching the nature of those bullets, one such example was the Pescas during their sneak attack on Tsuna months ago because of the (fake) inheritance ceremony.

At least they have a few suspects already.

"It seems that Bermuda has a large amount of flames stolen from him by the assailant. As much as almost consuming all of his life force." Fon informed as if they were talking about the weather and not about something that should have been an impossible feat. "The fact that he was only able to send the letters instead of his subordinates or him coming personally is another indicator that he's quite frail at the moment."

"Whoa," Takeshi's eyes were as large as dinner plates. "Back up. Someone managed to steal from Bermuda, the head of Vindice?"

"How is Bermuda now?" Tsuna inquired. It should be of concern since the holder of the clear pacifier was the key to keep a portion of the Trinisette balanced. If not... then it would be the return of the Arcobalenos whether they like it or not - and that was something all of them could do without.

"Weak." Verde added in curtly, pushing his glasses up. "As of now, he could barely manage to summon the sliver of flames within his body to keep himself alive."

"Then... then what about the containers?" Tsuna inquired urgently.

"... taken as well."

"WHAT?!" Things just got worse.

Reborn fired a gun shot. "We haven't even gotten to the worst part."

"That's not the worse?!"

"How did they even get the baby?" Mukuro demanded, finding it impossible to believe. Even he wasn't enough of an opponent of the Vindice during the Representative battle. "It's the Vindice."

Everyone within the room knew that if it wasn't for the arrival of one Sawada Tsunayoshi, they would have been six feet under, not sitting here talking about... the possible end of the world. (The situation wasn't anything peculiar since their lives were at stake. Again.)

"I'm getting to it," The infant scientist snapped irately at being interrupted. "It would seem that the enemy got their hands on some type of flame neutralization and flame extractor device. Judging by the name, whoever within the range of the former will have their flames nullified - though from Bermuda's information, the device seems unstable. It was destroyed after one use, but its effect seems long-termed; enough for the enemy to extract an excessive amount of Night Flames."

"Bermuda is still under that nullification device's effect," Lal picked up once more. "It's slowly wearing off so there shouldn't be too much problems as long as he is given enough time to rest."

"But..." Tsuna pressed, knowing that there was something else that the former Arcobalenos wasn't telling them.

"We all know the property of Night Flames, correct?" Reborn asked rhetorically, which earned nods in return.

The ability to do short-distance dimension hops (Unlimited in Bermuda's case) really was rather frightening. "From Bermuda's letter, since the enemy extracted a large amount of his flames, then we could safely presume that they're trying to accomplish some sort of dimension travel."

"Actually..." Verde interrupted. "While we were waiting for Decimo and his guardians to arrive - Spanner, Shoichi, and I were fiddling around..."

"Eh? Spanner-san and Shoichi-san are here too?!"

"Yes, I invited them, now stop interrupting Decimo." Verde snapped, taking off his glasses and wiping them with a handkerchief from his lab coat while also ignoring Tsuna's spluttering protest of aforementioned title. "We picked up a signal from one of our scanners that inform us that someone time-jumped."

Silence permeated the room rigth after.

.

.

.

Then chaos.

"Again with time travelling?!"

Starting with Tsuna panicking, which prompted both Takeshi and Hayato to try to calm him down, but ended up making it worse when Ryohei and Lambo joined the fray with their little antics... and everyone just dogpiled on their leader for some odd reason.

Kyouya had enough and decided to bite them all to death, which prompted Fon to stop him but ended up being the target instead.

Mukuro gleefully joined the fight that destroyed the meeting room table, leading to Lal snapping and firing her rifle at everyone to shut up.

Chrome jumped in surprised when a bullet went towards her and she collided into Skull, who was then sent flailing to Colonello, who promptly kicked the poor stuntman like a soccer ball.

Yuni would have been Skull's cushion if not for Reborn jumping in and slugging the former Cloud Arcobaleno in Mammon and Verde's direction.

The infant illusionist just faded out of existence while the scientist simply zapped Skull for even trying to 'assault him' (Verde wasn't chosen as an Arcobaleno just for his brains y'know!)

Yuni looked on helplessly. "Has this turned into a game?"

"Yeah," The hitman replied, staring at the scene without care. "They're trying to see who's the idiot among idiots."

"Oh, I see! Looks like fun!" The ex-Sky Arcobaleno pipped innocently.

"Don't join, Yuni."

And Gamma, who has been standing guard by Yuni's side, wholeheartedly agreed with Reborn's suggestion. They didn't want any stupidity or insanity to rub off on their precious princess/niece.

"Bububu~" Bluebell snickered. "I bet Zakuro's the idiot."

"Idjit, what did you say?!"

"Ha ho, I wouldn't object to that."

"Oi!"

Byakuran chuckled, popping a marshmallow in his mouth. "Ne ~ As interesting as it is to watch, shouldn't we get back to the discussion?"

Yuni watched the Sky Mare in concern. Byakuran was being too out of it if he wasn't joining into the chaos - or encouraging his guardians to do so for that matter. (Not that they needed prompting, seeing as they were starting to get pulled in already.) The instability of the parallel worlds must be affecting the Gesso greatly.

Reborn grunted and begrudgingly (What? He lived for chaos okay?!) had Leon turned into a rocket launcher (He deemed a gun was not enough to stop the noise level of this caliber) -

BOOM!

- And everything stilled when there was a new hole on opposite wall to Reborn. Nono twitched but didn't say anything, albeit he was not looking forward to the extra work piling higher and higher on his desk by tomorrow morning.

"Listen up, idiots." Reborn intone, an excessive amount of murderous intent surfacing that had everyone shivering on their spot. "The future existence of this world is put on the line here so leave your stupidity outside or I'll put lead in your heads. Capiche?"

"You will have to pay for your insult later Reborn," Verde was the first to break the silence. Even though his intelligence was his pride, Verde knew where to place his priorities when the future - or futures - was at state. "As I have said, we detected the signal of a space-time disturbance, indicating that someone has time-traveled. Yuni, you have told us that the future is unclear?"

The girl in question nodded, worried. "It's ... well... it's shattering... starting with Vongola."

The rest went unsaid but most of the people in the room got the gist of it. It will start with Vongola, then the futures connecting with it will also be indirectly affected.

"I see," Verde nodded. "Then I theorize that the enemy might have made Vongola their next target, but decided to time-travel back to the late nineteenth century, to the founding generation of Vongola. Most likely due to the fact that they have doubts of winning against the Vongola of the current time, whose next head had defeated the Vindice and now has us as allies."

"Deciding to tackle the problem by the root huh, kora!" Colonello growled, fists clenched. "They're just scared to take us head on, kora!"

"But isn't the First Generation not to be underestimated?" Fon offered. "They're not called the strongest in Vongola history for nothing."

"Not against future technology," Lal rebutted, grounding her teeth together. "And they stole the pacifier containers and Night Flames - who knows what they're going to do with them!"

"Other than incorporating it into time travel - which is what they probably did - I could think of a lot of things." Verde interjected helpfully. "They might even have found a way to reproduce them and incorporate them into Dying Will bullets - though I would like to know what will happen to the human body if inserted with a flame that does not corresponds with their own. An interesting experiment to conduct..."

Everyone else started to stray away from the eccentric scientist.

"Verde," Reborn interrupted sternly, silently telling the eager scientist that this was no time for him to stray off topic. "If the enemy has gone back to the past, then they're risking the chance of a time paradox."

"... Or possibly a formation of a new parallel world - this is getting fascinating by the second!"

"As fascinating as that seems, it wouldn't be a good idea."

"... Byakuran?" Tsuna send the white-haired Gesso, the one who spoke, a questioning look. The teen had been unusually quiet that Tsuna would've forgotten that he was in the room if not for his Intuition's constant reminder. "Are you... are you okay?"

"Fine and dandy ~ !" The marshmallow addict grinned energetically and somewhat similar to his usual self.

Tsuna, though, was not convinced. And so wasn't Yuni.

"What do you mean it wouldn't be a good idea." Reborn demanded. They haven't gotten around to this part of the discussion before because they had been too focused on the attack on Vindice. But now... everything seemed to connect somehow. However, Reborn was getting annoyed at all of the news that just suddenly popped up without his permission.

"The stability of the parallel worlds of course!" Byakuran chirped happily, plopping a marshmallow in his mouth. "If someone from our world goes into the past, changes it, thus creating a singularity that will branch out in the formation of a parallel world..."

"... then those people would be residents of the newly created parallel world," Verde came to a conclusion but his understanding of the topic wasn't enough for him to make any more hypotheses.

"Right," Byakuran nodded, then his smile became nonexistent as he adopted an uncharacteristically serious look blatantly, eyes pried open to reveal violet orbs. "By principle, those that belong to one parallel world cannot cross over another. If they managed somehow, then under certain laws governed by the horizontal-time axis, their original world will try to get them back. You can say parallel worlds are very possessive of their inhabitants. It's how the ten-year bazooka successfully transports its wielders into the past and return back to their proper world under an invisible thread attached to the time traveler. After all, the future is never set in stone, hence, the possibilities provided by parallel worlds. Creating a new parallel world meant that the creators became the original inhabitants; however, due to nature, their previous world would try to retrieve them back."

"... That would cause instability!" Verde realized with a mumble. "If that is their tendency... then it could cause a merge of two worlds since the inhabitants would serve as a link in between them, like an going tug-o-war where each side is pulling closer to the other!"

"Bingo!" Byakuran applauded. "Verde-san is as intelligent as they say!"

"Wait..." Colonello decided to speak. "Aren't parallel worlds not supposed to meet? That's why they're called parallel, right kora?"

"Yup~! So if two parallel worlds were to merge, a collision would happen instead and it would indirectly affect the surrounding parallel worlds like a virus because of similarities in the closer worlds as to the farther ones." Byakuran hummed, rocking on his feet. "I can already sense the balance beginning to tip as it is~!"

The others stared incredulously at how nonchalant the Sky Mare was speaking in this all the more worsening situation, but Yuni knew that the Mare was forcing himself so as to not let others see the worry behind the mask.

"So... what are we supposed to do now?" Tsuna voiced the question that they all wanted to know. He massaged his temple, feeling an oncoming headache because of the dilemma and his buzzing intuition. The fate of their world, and now parallel worlds were balancing delicately on a thinly made tightrope here!

Then again, Tsuna tends to work better when put under pressure.

"We don't even know who we're dealing with and it's not like we can reach them when they're about one hundred and fifty years into the past!"

"Let's not forget the pacifier containers," Lal tacked on with a scowl. "The Trinisette is already unbalanced as it is, much less the parallel worlds."

"... we're all doomed."

Although Tsuna had spoken that lightly, the effect was very much still gravely heavy since his words practically represented the destruction of more than one world.

"Don't be so pessimistic Dame-Tsuna."

"Someone has to." The brunet muttered indignantly, which, thankfully, his tutor ignored.

"Don't worry, we already have a plan working together."

"Wait..."Tsuna narrowed his eyes, not liking where this was going at all. His Intuition was happily confirming reality though, much to his ever-present dismay.

Reborn smirked, which caused the dread Tsuna was feeling to multiply a hundredfold. "It looks like you're all going on a little history trip."


'Kay, so. It's not only the destruction of their world but now parallel words are thrown into the mix. The dilemma is just getting bigger and bigger :D (Hm... I 'm not sure if that's too much but I was just thinking and thinking and adding this and that. I might have went a bit overboard with it but it's an interesting theory, no?)

Thanks to MoonFruit12, anyelanajera, Bubblepop32, ilovecartoonsgirl, D C JoKeR H S, Takuz for reivewing!

Happy reading! ~ヾ(^∇^)