DISCLAIMER: I DO NOT OWN KATEKYO HITMAN REBORN.

A/n: I originally thought I going to write and publish this somewhere on October since Tsuna's birthday is 14 October. But, I'm not sure whether I have time for it since I will start my university life at the end of September. So, I decided to post it now. This chapter focus on Tsuna's party instead of Reborn's although it's practically the same party. Please also read the note at the end of this chapter.

Warning : Rated T for safety. Not all characters are included in this chapter such as M.M. and the six funeral wraths (except for Bluebell). Might or might not be a failed attempt at writing crack/funny fanfic. Might have OOC and grammatical errors. Words in Italic are monologue.

Timeline : Take place after the arcobaleno representative battle.


Tsuna was currently lying on his bed facing the ceiling. Right now, everyone including himself and his mother was residing in one of the Vongola mansions in Italy. Nono literally gave Tsuna a whole brand new mansion as a present for his 15th birthday.

As he tossed around on his bed, he sighed. His hyper intuition has been nagging him ever since he was on his way to Italy on Vongola private jet. It's not the type that rang danger but it's not something good either. This was one of the moments that he wished his hyper intuition wasn't accurate. He promptly recalled back what happened two days ago.

Flashback

Tsuna was doing his homework when Reborn suddenly came in and kicked his head. Tsuna rubbed his head while staring at Reborn. "Reborn! When will you stop killing my poor brain cells?" Tsuna whined. He sometimes wondered why only he and Dino-san got this special treatment and not Ryohei or Yamamoto.

Ignoring Tsuna's pathetic whine, Reborn said, "Start packing now, Tsuna and cancel whatever plans you have this week. We are going to celebrate our birthday this year with Nono in Italy."

"WHAT! Why? I meant not that I don't want to celebrate my birthday with grandpa but what about kaa-san and the kids? And there's also Gokudera and the rest. I don't think they will be happy not celebrating my birthday together."

"We are going to bring Maman with us to Italy. Bianchi will take care of the kids for her. Your friends can celebrate your birthday later."

"That's not wha-" A bullet passed by just 1 mm from Tsuna's face and thus effectively causing him to swallow down any words that he wanted to say.

"You can't and are not allowed to turn down Nono's invitation. Besides, Maman deserved to a have a break with that idiota. This will be the perfect opportunity for you and your family to strengthen your bonds. We are going to leave at 9 tonight."

Reborn was about to leave the room when he stopped and turned his head around to look at Tsuna. "Ohhh, before I forgot, congrats on getting a mansion of your own. It's your advance birthday gift from Nono."

Tsuna stared and blinked at the now empty doorway for a whole 10 seconds before his brain finally processed Reborn's words. "EEHHHHHHH!"


Tsuna doesn't really get to sleep peacefully throughout the whole 12 hours flight. Somethings doesn't feel right here. Well, he got his answer when he reached the mansion with Reborn and his mum.

Standing in front of the mansion were all Tsuna's guardians and friends and Simon famiglia, welcoming him albeit a few of them looked reluctant to do this.

"I thought you said it will only be you, me, Nono, kaa-san and otou-san. Why is everyone here?" Tsuna asked Reborn who was now sitting on top of his head.

"I never say anything about not bringing them here. And I did tell you. Remember, I said this will be the perfect opportunity for you to strengthen your bonds with your family."

"You said family, not famiglia like what you usually said."

"And I thought you are the one who said Family (famiglia) is also family. Everyone is part of your family."

Tsuna sighed. At the same time, he was also happy. He got to celebrate his birthday with all his family members and his friends. Although he idly wondered how Reborn managed to convince Hibari and Mukuro and his gangs to come here and why those two battle maniacs didn't fight each other. He thought that maybe lady luck has finally decided to return to his side after all this time.

Flashback ended

Now that he thought about it, he should have known the reasons why those two didn't fight. That's because that little sadistic devil invited EVERYONE to the party that was due in half an hour from now. That's mean that Hibari and Mukuro got to fight with each other and other strong people in the party that he was 101% sure will turn into a warzone.

Tsuna groaned as he kept thinking about what will definitely happen in the party later. Why can't I celebrate something without destruction following me just like other normal people did? Maybe, just maybe I still can run away now. I can fly to one of those undiscovered islands that Byakuran kept talking about and hide there for a few days. Screw that party or my birthday. I need to save what remaining of my sanity.

As he was thinking about the possible ways (which is none since Reborn is around) to sneak out from the mansion undetected, his door opened and both Gokudera and Yamamoto came in.

"Yo, Tsuna, ready for the party?" Yamamoto asked and thus indirectly breaking Tsuna's train of thought.

"You baseball idiot! I was the one that supposed to greet Juudaime first!"

"Ohh, hi, Gokudera-kun, Yamamoto-kun."

Sensing the slightly tired tone of Tsuna, Gokudera asked. "Are you alright, Juudaime? Are you sick? *gasps* I immediately call an ambulance. Sorry for not noticing it earlier. I'm such a-"

Before Gokudera went to his full self-panic and blaming mode, Tsuna immediately tackled him down onto the bed and locked both his hands above his head so that he couldn't grab his phone and call for ambulance.

"No. I'm not sick. Just a bit…errr….excited?"

"Haha, you didn't think of escaping from your own birthday party, right, Tsuna?"

"Err, no?" Tsuna smiled nervously.

"Hi, Tsuna. Want to go to….." Enma paused and promptly stepped back before closing Tsuna's door. "Sorry for disturbing you guys. I'll wait for you in the hall." He then muttered something along the line 'can't believe', 'too early', 'seme' and 'uke' as he walked down the hallway.

"What's wrong with Enma?" Tsuna tilted his head while Yamamoto shrugged.

"Juu..Juudaime, I don't want to sound rude but how long are we going to stay in…in this position?" Gokudera said with a tinge of blush on his face.

Tsuna blinked and it took him a while to understand what Gokudera meant. He immediately jumped off from his bed. "Hiieee, I'm sorry, Gokudera-kun. I didn't realise it. Really sorry. Mou, Yamamoto-kun, you should have told me earlier. No wonder Enma-kun run away. I better explain this to him before he misunderstands this further."

"Tell you what, Tsuna?"

"Just shut up and forget about it, baseball-idiot."

The door to the main hall was crashed down by a certain silverette covered with dirts and mud as the clock struck 12. "Happy birthday, Juudaime!" Gokudera said while running towards Tsuna who was standing with Enma and the rest.

"Thanks, Gokudera-kun. Are you okay? I was so worried when Reborn dropped you down the trap door."

"You look like you have a lot of fun to the EXTREME! You should have called me to tag along too, octopus-head!", shouted Ryohei over the noisy hall.

"Haha, Gokudera. You managed to come back just in time for Tsuna's party. Oh, and happy birthday, Tsuna." Yamamoto helpfully removed a small fish (piranha) that still bite onto Gokudera's jacket. (All of them are wearing casual)

"Shut up, turf-top! It's not fun at all, dammit. And you, how the fu* did you come back here before me? I thought you are also being dropped down there." Gokudera pointed a finger at Yamamoto.

"I got lucky, I guess."

Tsuna was about to stop them from fighting when he was dragged onto the stage by Reborn using a big hook attached to a fishing line.

"Gyahahaha. Reborn just caught a fluffy tuna fish! Gyahahaha." Lambo laughed out loud. Somehow, his comment was heard by everyone in the hall despite all those noise and the hall boomed with laughter mainly from Varia and Skull. Even the nice people like Enma, Fuuta, Irie, Yuni and the girls can't help but giggled at the comment.

"I'm not a tuna fish! And I'm not fluffy either!" Unfortunately, the only person who payed attention or listened to him was his storm guardian who was now on the verge of strangling his lightning guardian.

Lambo managed to slip passed Gokudera and ran towards Tsuna for protection. Reborn who was on the stage tripped him over and the 10 year bazooka slipped out from his afro and flied towards Tsuna.

The brunette's only thought that time was 'Please no more finding myself lying in a coffin again. Nothing is worse than that.'

As the pink smoke cleared away, standing in front of everyone on the stage was the 25 years old Vongola Decimo, who looked exactly like a carbon copy of Primo except for his brown hair and eyes. Most of the people in the hall would have been impressed by how Tsuna has grows in the 10 years' time but instead, everyone has different reaction.

That was because standing there was future Tsuna, with his messier than usual hair, dressed in nothing but a white long-sleeved office shirt that barely covered his crotch with the upper part of the shirt unbuttoned revealing a few red spots on his neck and shoulder.

"Gyahahaha, dame-Tsuna got bitten by mosquitoes on the neck and shoulder." Lambo laughed.

Reborn smirked.

Gokudera fainted on the spot with a nosebleed.

Enma and Dino almost choked on their food. Enma thought, And you told me just now you are not into that kind of relationship, Tsuna-kun.

Irie accidentally spilled his drinks over his laptop and the laptop exploded. He knew he should have hid somewhere so that Byakuran couldn't kidnap him to this party.

Verde and Spanner didn't bother at all with their surrounding since they were too immersed in their own works.

"You should try a kitty outfit, Tsu-chan. You'll look cuter that way~~" Byakuran said while floating upside down beside Bluebell.

Gamma immediately shielded Yuni from the view although it might be a little too late since Yuni was blushing.

Kyoko and Haru immediately closed their eyes with their hands though Haru peeked through the gaps between her fingers and drooled.

Ah, the power of love~~. Bianchi thought as she stood on Shamal's body who has passed out either from too much alcohol or the poison in his food or both.

Basil looked shocked. "Sa…Sawada-dono?!"

Lancia took pity of Tsuna somehow.

"You look smexy, kora!" Collonello said and he got hit on his head by an umimpressed Lal.

I knew this would happen when Reborn-senpai became Tsuna's home tutor. Skull groaned.

Viper was busy taking pictures of Tsuna. I wonder how much I can make by selling these.

Fon took a deep breath and sighed before hiding Ipin's spectacles away so that she couldn't see Tsuna clearly. (They were sitting quite far from the stage)

Ipin wondered where her spectacles go. She was sure it was with her a minute ago.

Lussuria cooed at Tsuna.

"Hahaha. The trash got owned."

"VOOI, WHO'S YOUR FU*ING PARTNER?!"

"Are you in the middle of doing a stripping show, tuna fairy?"

"Ushishishishi. The peasant has upgrade to a new level."

Nobody cared about Levi who was still trapped in the maze under the mansion.

"Bo…Bossu" Chrome blushed and being the kind-hearted person she is, she immediately put an illusion of pants on Tsuna.

"Kufufufufu. Didn't know you prefer to celebrate your birthday that way, Sawada Tsunayoshi. But I prefer you didn't show up like this in front of Nagi." Mukuro moved to cover Chrome's left eye while at the same time cancelled Chrome's illusion without her realised it.

"Herbivore, for your indecent appearance, I'm going to bite you to death."

Meanwhile, Yamamoto, Ryohei, Fuuta, Rauji and Kaoru were clueless on the sudden change of the atmosphere.

The only people who were unfazed by Tsuna's appearance and continued to do what they were doing before were the rest of Simon famiglia members, Chikusa, Ken, Bluebell, Nosaru and Tazaru.

Tsuna immediately tried to cover himself up. "Wa….wait a second, guys. It's not what you see. I..I was just about to go shower. Just like Lambo said, those were mosquito bites. It's not like I want to show up here, Mukuro and please don't bite me to death, Kyo-." Tsuna ducked just in time to avoid the shot from Reborn and the chain from Hibari's tonfa.

"You're suck at lying, Tsuna."

"For calling my first name, I'll bite you to death, herbivore."

And thus, Tsuna has to run for his life to avoid the attacks from both Reborn and Hibari, at the same time trying not to bump onto any obstacles created by Mukuro's illusion while the rest ignored them.

"Stop shooting at me, Reborn. Whose fault did you think I'm like th-" Before he could finish his sentence, he was back to his own time again and in his place was the fifteen years old Tsuna, whose face was as red as a tomato.

"Yo, otouto. You can't enjoy your party if you hid here," said Dino as he approached Tsuna who was hiding at the corner of the hall, followed by Enma and Yamamoto.

"It's easy for you to say, Dino-san. You are not the one that embarrassed yourself in front of everyone."

"Well, not really everyone. Your mum and dad aren't here. So were Nono and his guardians and-"

"You are not helping at all, Enma-kun. Hmm, at least you are right about kaa-san and tou-san. I don't know how to explain to them if they are here just now."

(Nono, Iemitsu and Nana didn't attend the party because Nana thought that they shouldn't disturb the youngsters having fun. Iemitsu was not jealous at all when Nana hugged Reborn and kissed his cheek as she wished him happy birthday. The door handle that turned into ashes in his hand was so not the sign that he was jealous at the little hitman who smirked at him as he returned his Maman's kiss.)

"Well, look at the bright side; it can't get worse than that, right?", said the ever optimistic Yamamoto.

(And after that day, the sentence 'Nothing is worse than this/ It can't get more worse" or anything similar to those sentences has officially made their way to Tsuna's dictionary of taboo.)

"That's right. Here, I brought cake and drinks for you, Tsuna." Dino handed him a plate of strawberry cake and a glass of orange juice.

It didn't take long to prove that Yamamoto's words were wrong. Not long after Tsuna drank the juice, he began to feel happy and giddy at the same time.

Enma was the one who noticed something was wrong with Tsuna. Before he could ask him what's wrong, he was distracted by Julie who suddenly yelling for helps.

"COME BACK HERE, YOU WOMANIZER!" Adelheid was firing ice shards at Julie who tried to flirt with a few maids that were bringing new dishes into the hall. Judging from her slightly flushed face, she was drunk. And poor Julie was trying to run away from her.

"Herbivore, for drinking alcohol although you are still underage, I'll bite you to death." Hibari kicked Julie who was blocking his way and charged towards Adelheid with tonfa in his hands.

"Shut up, birdie prefect. I'm trying to teach that guy a lesson. Don't get in my way!" Adelheid blocked his attack using her metal fan.

Julie crashed onto Colonello who was running away from a pissed off Lal Mirch, who apparently also drunk. "What the he* did I do, kora?"

"Hhiieee! Who give Adel alcohol? This is bad. We gotta hide, Tsuna-kun." Enma quickly grabbed Tsuna's hand to run but stopped when he heard Tsuna giggled.

"Tsuna?"

"Awww, don't be ridiculous, Enma-kun. They are just playing. Now, did you see my cute little home tutor? I want to tell him something."

Enma immediately stepped back and pushed Tsuna towards Dino who stared at Tsuna as though the brunette grew two heads. He didn't need the demonic intuition of his best friend to know that something really bad will happen in the next few minutes. The Simon don quickly scampered towards the door and left Dino to deal with Tsuna.

Apparently, Enma was not the only one who left the party and went back to the room in the east wing of the mansion. Irie, who was almost killed by Adel's ice shards, decided that his life would be in danger if he stayed any longer. He tried to drag Spanner along but failed since the blonde refused to bulge from his seat. Rauji and Kaoru ushered Lambo and Fuuta back to their room after he saw Adel losing control of her temper. Gamma, sensing the situation was getting out of control, persuaded Yuni and the girls (Bluebell, Kyoko, Haru, Chrome and Ipin) to go and take this chance to have their so-called girl night since it's rare for them to be together.

"Ne, Dino-san, where's Reborn? I want to wish him happy birthday properly. Let's go together~~ " Tsuna chirped and smiled.

Dino tried to run away but he tripped over his foot again for the umpteenth time that night and knocked himself out. He was never so thankful for his clumsiness up till now.

"Awww, Dino-san. You're such a bad big brother for sleeping here and ignoring me. Oh well, I guess I'll go by myself then~"

It didn't take long for Tsuna to find the ex- sun arcobaleno who was sitting with Fon, Skull, Viper and Verde who came to ask something.

"Ne, Reborn, can you look here for a second? I have something to tell you."

"What is-" Reborn couldn't finish his sentence when Tsuna kissed him. On his lips. In front of the little group of ex-arcobaleno.

"Happy birthday, Reborn. Did I ever tell you how cute you are~~~" Tsuna pat his tutor's head.

"That was golden, kora!" Colonello who was being tied onto the chandelier upside down by Lal a minute ago, laughed as he saw the scene. At the same time, he was swinging around to avoid the knives from Belfegor who treated him as a piñata.

Skull laughed till he fell from his seat while Verde chuckled when he saw the rare surprise look on Reborn's face. Viper secretly took photos for blackmail purpose while Fon blushed at the scene as he subconsciously imagined Reborn in his adult form being kissed by Tsuna.

Reborn froze for an exactly three seconds which in that time, Tsuna has disappeared to somewhere else. And once Reborn recovered, he immediately started on his newest self-appointed mission, which was killing all the witnesses. Good thing he only has to chase down five targets. Or else he would have to waste his time finding a large space to bury all those bodies. Dame-Tsuna, hope you'll enjoy your 'tutoring' session once we got back to Japan.

Meanwhile, Tsuna moved on to his next target. Mukuro was enjoying his chocolate lava cake when someone tapped his shoulder. He turned around to see Tsuna smiled at him.

Hmmm, that's weird. What's he up to? Mukuro narrowed his eyes. "Kufufufu, did the birthday boy want to offer his body for me to take over?"

"Nope. But, I got something better for you. Here, a strawberry pie." Tsuna smacked the said pie onto Mukuro's face. He then scraped some of the pie using his finger and licked it before scrunching his face up. "Pineapple mixed with strawberry pie is a bad combo. Taste weird." He said in a deadpan manner.

Ken who was squatting down near Mukuro was torn between bursting into laughter and defending his Mukuro-sama.

Oya oya. The one time I try to be nice and not wrecking this party and you did this to me, Sawada Tsunayoshi. Mukuro's veins popped up on his face and he tried to smack a plate of pasta onto Tsuna who jumped sideways to avoid it.

Gokudera, who has woken up, saw Mukuro tried to 'attack' his precious Juudaime. He immediately aimed a plate of pizza at Mukuro, but the pizza landed on Ken. Ken changed into his king kong channel and threw a basket of fruits at Gokudera but ended up hitting Nosaru and Tazaru instead, who in turned accidentally hit Squalo and Bel with plates of risotto. And, thus this started an extreme food fight as quoted by Ryohei with Fran helpfully supplied everyone with illusionary foods and fruit bombs using Verde's equipment.

Tsuna, unawared of the food war that he caused, proceeded to find his next victim, Xanxus, who sat by the table which was full of steaks and liquor. On his way, he passed through Lal and Adel who bonded over and talked about their idiot flirty boyfriends with Bianchi as their love advisor and also Basil who was knocked down by one of Yamamoto's fast balls (apple).

"Xanxus, why are you alone here? Did you not enjoy the party?" Tsuna made a sad puppy face as he stood in front of Xanxus.

"What the f* did you want, trash?"

"Nothing. Just want you to know that I always love you despite how harsh you are to me. Want a hug?" Tsuna spread out his arms in an attempt to hug the Varia boss who wore a WTF expression on his face.

"F* OFF, TRASH. YOU ARE COMPLETELY WASTED!" Xanxus threw a bottle of liquor towards Tsuna who avoided it.

"You're so mean, Xanxus-chan. " Tsuna left with crocodile tears on his eyes. But once he put quite some distance between him and Xanxus, he turned his head around and said "But, I still love you~~" and promptly send a flying kiss towards the enraged boss of Varia who tried to shoot him down but couldn't since his head got hit by a watermelon bomb by someone.

Fortunately, before Tsuna could move to his next target, someone knocked him down from behind and piggyback him back to his own bedroom without anyone noticed. "….. I think it's time for you to go to bed now before you make everyone chasing after your blood tomorrow. Seriously, you are such a troublesome brat…"

Two people were sitting on the bean bag chairs that were hovering near the covings. One was eating a cake with marshmallow as toppings while the other was holding a camcorder.

"You are going to be so dead when tuna fairy found out you are the one that spiked his drinks." Fran said as he was busy recording the whole chaos while creating more fruit bombs everywhere.

"Nope. See here." Byakuran took out a small card from his pocket and pointed at the sentence. 'Feel free to enliven Tsuna's party by any means.' With the words Tsuna's party bolded and highlighted with orange colour. Apparently, that was the invitation card that Reborn sent to everyone. "Even if I do, you are going down with me, Fran-chan since you are the one that help me~~" Byakuran added as he tried to aim a pineapple bomb at a certain skylark who got dragged into the food war by Ryohei.


A/n: That's all for now. I'll just have the urge to write a drunken Tsuna where he acts childish and pranks other people. Ohh, just to tell you, the whole party was held from 10 pm (13th October) till 2 or 3 am (14th Oct). 10 pm to 12 am was considered as Reborn's birthday party and the time after that belongs to Tsuna's. And hence explained why the chaos only start after 12 am since Reborn will kill anyone who dare destroy his party.

The trap door things was Reborn's punishment to those who fail to do performance for him. Might write an extra for this if I have more idea.

BTW, the next chapter will be an extra of this particular chapter which will due in next week. Followed (probably) by birthday oneshots for Reborn, Mukuro or Hibari.