A/N: Hey~! Well, here's a new fic! Yay! *crickets* 😭You guys are so cruel! Anyway, this is a fic that's been bothering me for awhile now. That's because the only First and Tenth Together fic that I have ever read is where Tsuna and the others got sent to Primo's time.

Natsumi: So she thought, 'Why not reverse everything?'. And that's what she did. The fruits of her hardwork was this fic.

Me: 😁I worked hard on this~ Tell me if you want me to continue this fic or not! Corrections and criticisms are always welcome~! 😊

Disclaimer: I do not own Katekyo Hitman Reborn! It belongs to the awesome Amano Akira!

A/N: Now, on to the story!

Prolouge

Meet the future Vongola Primo

Tsuna, who had just recently turned 18 and already at his last year in Highschool and who was supposed to enjoy his weekend, was stuck babysitting a 10 year old Lambo and I-Pin. A bratty 10 year old Lambo and still a ticking timebomb I-Pin.

Even though the battle with the Arcobaleno representatives is already way over and he was already enjoying his supposedly 'Mafia-free' life (as if), he is still stuck with the responsibility of taking care of Lambo and I-Pin.

Maman had gone shopping with the 15 year old Fuuta for groceries so there is no one left to take care of the two except Tsuna himself. He can't ask Reborn and Bianchi because they had returned back to Italy for a meeting with the Ninth.

'I should have asked Kyoko to take care of Lambo and I-Pin for me... Imagine how many videogames I could play with the time I'm spending with this two.' He thought gloomily as he watched the two run around the house from his perch on the stairs and eventually breaking a dish or two.

He rushed over to the kitchen at the third broken plate, "Hey you two! Stop breaking things already!" He shouted as he peeked at the place where the two were desperately trying to 'get rid of the evidence'. The two scratched their sheepishly.

I-Pin was the first to apologize as Tsuna started to help them clean up, "Sorry, Tsuna-nii."

While Lambo... "You can't tell me what to do, Baka-Tsuna!"

"Then why are you guiltily cleaning up?"

"S-Shut up!"

Tsuna sighed as Lambo sped up cleaning, clearly hiding his embarrassment as the older male once again read him like an open book.

I-Pin, who was ever the sweet girl, has already started to look like her older self. She was already growing more hair but still not enough to cover her big forehead. It was neatly tied into two braids. Her eyes rarely squints now that she was encouraged to wear contacts instead of glasses. She has also been fluent at Japanese the past year which is thanks to Kyoko and Haru teaching her.

On the other hand, Lambo was still bratty but at least he's showing that he has a conscience every now and then, especially when he's the one at fault. His hair has already passed the afro stage and was now curly like Adult!Lambo's signature hair. He also stopped wearing the cow printed onesie and instead opted for the cow printed button up shirt and black pants. Not much of a difference since it's still cow printed but it's better nonetheless.

The two also suddenly increased in height when they turned 7, almost as tall as Fuuta when he was still 10.

Just as Tsuna had dumped the broken plate shards in the trash, a thump from behind reached his ears followed by a groan. 'What is it now?' He turned around and saw Lambo laying on his stomach on the floor and rubbing his head indicating that he had slipped and bumped his head in the process.

"Hold... it... in..."

I-Pin hurried over and knelt beside him, a worried expresion on her face, "Lambo, are you alright?"

Lambo sat up and sniffed once before answering, "Yeah..."

Tsuna watched this with a heartwarming smile, 'Lambo has matured a bit, I'm feeling kind of proud.' And just then, a spark from the depths of Lambo's hair caught Tsuna's attention.

"Lambo," he called out. The two looked over at him, "What's that sparking in your hair...?" He pointed out.

"Eh?"

Lambo started digging through the never ending abyss known as his hair, pulling out various weapons, toys, and candies. Apparently, the source of the sparking was coming from none other than the Ten Year Bazooka.

Before anyone could ask what was wrong with it, it jumped away from Lambo and started dancing a bit before they heard the familiar 'Poof' and the pink smoke.

"Wha-?"

Tsuna started fidgeting a bit. Something about that pink smoke has sent him a headache, indicating that his Hyper Intuition is telling him that something is not right. Which is very likely since the Bazooka didn't hit anyone and he doesn't know who or what will appear.

"Tsuna-nii..." I-Pin and Lambo hid behind Tsuna, obviously thinking the same thing as him. Once the pink smoke has started to clear away, he anxiously clutched his gloves and pills from inside his favorite hoodie's pocket. 'What do I do if it's an enemy?'

He was just about to take it out (and the kids were already getting ready to run since whenever Tsuna gets a rigid posture, it only meant trouble) when a sillouette of a mere 7 year old child appeared.

"Dove sono...?" ("Where am I...?")

It took Tsuna a few blank seconds to realize that the kid is from Italy and was asking to no one in particular about where he is. 'Crap. Don't tell me a random Italian kid from the future got transported here!'

Lambo, however, instantly recognized his native language and said in an 'obviously' manner to the sillouette, "Sei in Giappone!" ("You're in Japan!")

"Eh? Giappone?" ("Eh? Japan?")

The pink smoke cleared and what Tsuna saw made him gasp. 'That fluffy blonde hair... that blue eyes... It couldn't be...!'

"Primo?!"

"Primo?" The 7 year old turned to look at the person who had just called him Primo. He doesn't understand. Why would he get called Primo? It's not like he's a leader of some sorts, right?

The person turned out to have brown fluffy hair like his and brown eyes. He was wearing very weird clothes and was shielding kids that looked like they were only 9 or 10 years old. But that wasn't what caught his attention, it was the fact that the brown haired guy infront of him looked exactly like him.

Being only a child, he couldn't help the tears that started to cloud up his vision and his misunderstanding. 'I cannot believe it... It's Papa...! there is nothing to doubt about! We look exactly alike!'

He had never met his father or mother before. He was abandoned and was left in the hands of an orphanage ever since he could remember. But he had always thought that him and his father looked alike.

"Naze koko ni iru?!" ("Why are you here?!")

To Giotto, the guy was talking in a different language so, because he couldn't understand it at all, he ignored it and took a step towards the brunette.

"Pa... Papa..." his voice was shaking and his tears are almost spilling over.

The brunette took on a confused face, along with the two children behind him. 'Does he not remember me?' Giotto ran towards him and and hugged his middle, tears already spilling over.

"Nani-?" ("Wha-?")

"Papa! It's me, Giotto! I'm your son!"

"Figlio?!" ("Son?!") Lambo stared wide eyed at Tsuna, then at Giotto, then back to Tsuna. "Why didn't you tell me that you have a son?! I thought I'm your one and only!"

"I don't have a son!" Tsuna looked down at his child ancestor as he continued to soil his hoodie, "And what do you mean by you're my one and only?! I don't remember ever saying that!"

"Oh yeah..." Tsuna and I-Pin sweatdropped at him.

I-Pin looked at the young Giotto and patted his head, making the teary-eyed blonde look at her. "Are you alright?" She asked, only to be met by a confused look.

"'Are you alright'?" He repeated in a confused way.

"I-Pin, he can't understand Japanese." Tsuna sighed. He knelt down so that he's at level with this utterly cute blonde and, remembering every Italian he have learned, said in all seriousness, "Io non sono tuo Papa." ("I'm not your Papa.") It was blunt but he didn't want his small ancestor to have a misunderstanding.

"Eh...?"

Lambo deadpanned at Tsuna, "Modo di rifiutare la vostra responsabilita come suo Papa." ("Way to refuse your responsibility as his Papa.")

"Sta 'zitto." ("Shut up.")

Giotto looked between the two of them as tears started welling up again, "M-Ma tu sei Papa..." ("B-But you're Papa...")

Tsuna opened his mouth to deny it again (which was starting to get hard since Giotto was unconciously being cute. I mean, look at that blonde! Look at him straight in the eye and try deny whatever he is saying) when he heard the front door open and a cheery voice say, "We're home!"

The three panicked and frantically looked for a place to hide the blonde. They couldn't possibly explain a blonde Tsuna look-alike to Maman and Fuuta but they could only find none.

The three looked at each other, then to Giotto who was still clutching to Tsuna for dear life, then back to each other before they sighed. The only thing they could do now was to say that Giotto is Tsuna's future son and hope that the two were dense enough to actually believe it. It will create more misunderstanding in Giotto's part but...

"Are?" Tsuna's Mama stood in the door way with a slightly surprised face, her hands full of groceries. Fuuta was peeking behind her shoulder at the blonde that was currently being a Koala to Tsuna.

"Tsuna-nii?"

"I-I can explai-!" Tsuna haven't even finished what he was saying when Nana attacked his 7 year old ancestor with hugs, squealing a bit here and there.

"He's so cute!" She lifted the uncomfortable blonde in a way a parent would, "My, you're so sly, Tsuna! When did you decided to give me a grandchild~?" She rubbed her cheeks against Giotto's.

"Chi...?" ("Who...?")

"Chi?" She looked confused for a moment, "Oh! He's speaking Italian!" Nana smiled and placed Giotto back at his feet. She looked back to Tsuna, "So, who's the lucky girl who got to marry Tsu-kun~?"

Tsuna feels like facepalming. Seriously, he's only 18. How can he marry and keep it a secret from his mom? And harbor a 7 year old kid, too?

"He's not my son!" Well, shit. Looks like their plan failed. Already.

"Oh? So you adopted him?"

Palm, meet face. "No!" Yup, their plan didn't even have time to make an appearance before Tsuna decided to deny everything.

Lambo held Giotto up, thinking that they might as well tell the truth, "He's an orphan." The other three who didn't know gasped comically.

"What?!"

"Is it true, Tsuna-nii?"

"My, you poor boy."

The blonde looked uncomfortably at the three who looked at him with pitying gazes. He may not understand what they were saying but, with the looks they were giving him, it may have something to do with what the older boy with the cow print shirt had said right after he picked him up.

What were they saying anyway?

The woman, after looking at him for a while, successfully making him even more uncomfortable, perked up as if she thought of a great idea. Once again, she carried him and smiled at the blonde with the gentlest smile he have ever received and said in the sweetest tone...

"Anata wa watashitachi no kazoku no ichiin ni naritai?" ("Would you like to be part of our family?")

Giotto could only look at her in confusion, purposely ignoring the panicking of his Papa behind him. He facial expression soon turned into shock and happiness after the brief translation from the older Italian boy.

"Really...?"

Hearing the boy speak again in Italian, Nana nodded with a big ass smile on her face. Giotto smiled at her with the biggest one he could muster, as well. The other four occupants of the room smiled at each other.

'It's better to have Primo experience a family even for once in his lonely childhood. It also doesn't matter if it's only for a limited time...' Tsuna thought with a smile as he watch Nana cuddle his cute adorable ancestor once again. That smile, however, was wiped off his face as he realized one thing.

'Shouldn't he be back at the past by now?! It's more than 20 minutes already!'

His face was drained of it's color at this point and then he promptly passed out. Screams of panic was the only thing he heard with his ancestor's worried face the last thing he saw.

Me: Done! Giotto is so cute~ I wanna cuddle him, too! 😄 Nana-san is so lucky!

Natsumi: Whatever. Anyways, tell us which pair you guys want to appear next. Review, please!

Me: Bye bye! 😙