Disclaimer: I do not own khr~! Because if I did, 6918 would be canon, however, both Mukuro and Hibari, as well as the other characters, would not look as hot / cute as they are now.

Rivals... with Benefits

Chapter 1 – One-night Stand

Today is the 24th birthday of Tsunayoshi Sawada, also known as Vongola Decimo / the Tenth Boss of Vongola Famiglia. However, even then, he sees today as nothing very important or special. For him, it is just a normal day in the headquarters, but then again, that is his opinion, his friends, family, relatives, guardians, subordinates, acquaintances, companions, allies, comrades and fiancé, which is Kozato Enma, also known as Shimon Decimo / the Tenth Boss of Shimon Famiglia, thinks so otherwise. If for Tsuna, today is just an ordinary day, for those people, today is a day that must be celebrated for it is the very same day, but not year of course, that their beloved boss, friend and comrade incarnated to Earth.

For the past nine years in the history of Tsuna's birthdays, there was not even a single record of Mukuro Rokudo and/or Hibari Kyoya attending any of the parties his friends and family planned and organized. At the beginning, Tsuna thought it was a good thing, but on the long run, something a little bit saddening.

It really saddens him to know that the two would never attend any of his parties, partially due to Mukuro's hate for mafia and Hibari's hate for crowds, moreover their hate for each other.

It would really mean a lot to him if both attended even just one of his parties. It's really okay if they don't attend on the same year as long as they would attend even just once! That's how badly Tsuna wanted them to attend, because, not only are they his guardians, they are also his friends.

This year, however, Yamamoto Takeshi decided to make a difference. When Gokudera Hayato, Tsuna's right hand man, called out a meeting for planning their surprise party for the brunette, the first thing Yamamoto did was to volunteer in inviting Hibari and Mukuro. At first, Gokudera yelled at him, and scolded him for attempting to do such thing, but then after Yamamoto explained his point of view to Gokudera and telling him some stuff Tsuna told him on his last birthday, Gokudera could only sigh and allow him. After that, they began assigning the roles of each. At the end of the meeting, everyone had a role of their own, a role that they are very well capable of doing.

Tonight is the night they would finally throw the party for Tsuna. Everything was set, from the roof down to the floor. It was an awesomely perfect view, a view that speaks both elegance yet awesomeness. However, what speaks more awesomeness is the fact that Mukuro Rokudo and Hibari Kyoya are breathing on the same room, sitting on the same table, beside each other, without trying to rip each other's heads off. It was indeed a miraculous view. As for those who knew who made this all possible, they couldn't think anything else other than, 'YAMAMOTO, YOU'RE A MIRACLE WORKER!' with a priceless expression imprinted on their faces. Yamamoto could only laugh at this.

People's chattering echoed in the elegantly awesome room that is probably twenty times bigger than Tsuna's house. However, the buzzing sounded faded to silence when one of Dino's subordinates whispered something to Dino and Dino went to pass the message to Gokudera, who requested, more like demanded everyone to shut up.

After a few seconds of silence, Tsuna entered the hallway, blindfolded and assisted by Enma.

"Enma-kun, where are you taking me?" the birthday boy asked, eyebrows slightly arched.

Enma smiled, "You can remove your blindfold now, Tsuna-kun!"

Tsuna did as he was told only to be surprised by a 'HAPPY BIRTHDAY' from all of his friends.

Tears forming at the edge of his eyes, Tsuna spots a group of familiar faces. It can't be… the Kokuyo Gang is here, as well as Tetsuya Kusakabe. That can only mean one thing, Hibari and Mukuro are here. A gentle smile crept on his face. Soon, he spotted the two, sitting beside each other without trying to kill the, other. Whoever made this possible, he was thankful indeed. Not so long after that, tears began rolling down his cheeks, "Thank you everyone!"

Tsuna recited a speech which he dedicated for all those who came and those who made things possible. After doing so, each of his guardians and friends, as well as Hibari and Mukuro, dedicated a speech for him too.

The speeches made by his friends revealed that it was Yamamoto who made the impossible possible. Tsuna could only smile at him in gratitude. Words could most definitely not describe his feelings of thankfulness towards the baseball fanatic.

After the speeches and some experience sharing, Tsuna, in a formal yet playful tone, declared, "Thank you everyone! To show how much thankful I am, let us now begin the party of the century that my beloved friends have prepared for me. KANPAI…!"

"KANPAI…!" was the reply the crowd gave Tsuna, thus the party began.

All the Vongola guardians sat on the same table.

"OII…! Hibari! Let's drink to the extreme!" Ryohei yelled as he brought out six bottles of sake.

Hibari looked away, "I don't drink with herbivores." and proceeded eating his Salisbury.

Mukuro smiled playfully, "You don't drink with herbivores or you can't drink at all?" he teased in a provocative manner.

Hibari shot him a glare, "Says the pineapple that no one has ever seen drink." he provoked back.

Not so long after that, the Vongola guardians found themselves watching both Hibari and Mukuro having a sake drinking contest.

A few minutes later, Hibari and Mukuro were burning red in drunkenness and were hiccuping as if they were to die. Looks like neither of them can hold their alcohol pretty well. It was quite obvious, considering the fact that, earlier, they were glaring at each other, now, they're practically dancing a romantic song with the other as the partner.

When the romantic song ended, the next song played very soon after, and that next song was, 'I Ki**ed a G*rl' by 'K**y **r*y'.

"Neh~ *hiccup*~ Kyo-*hiccup*-ya-kun~ ever kissed a guy?" Mukuro asked, obviously drunk.

Hibari shook his head, obviously just as drunk as Mukuro, "No, *hiccup* why did you ask? *hiccup*"

Mukuro grabbed Hibari's collar and clashed his virgin soft lips against Hibari's warm and fluffy ones. As aggressive as they are now, at the moment Hibari felt Mukuro's tongue getting closer to his mouth, he pulled the pineapple head closer to him and began a tongue-war with the illusionist. Mukuro, however, was not as vulnerable as he looks right now and began fighting back. As the two parted, still connected by a thin string of saliva that slowly dissolved into nothingness, Mukuro smirked, "Now you did~ kufufufufufufufufu~" he laughed.

Hibari licked his lips, "Now that you think about it... that wasn't so bad, Rokudo Mukuro."

"Want some more?" asked Mukuro.

Surprisingly, Hibari smirked and nodded. Thus he was brought to a random room, by Mukuro. A room with a bed and a soundproof, lockable door and let's just say, they had one heck of a night!

The next day...

Rays of sunlight shone on Hibari's pale white skin. Urgh, for some reasons, his hip is undeniably sore and his damn body, as well as his head, is painfully throbbing like heck! Hmm, but somehow, there was something else… right… he is naked.

Wao- wait… he's naked, his hip is sore… his body is aching, he was drunk and… holy shi-, he has a bite mark on his arms! Not only on his arms, as well as his legs, neck, abdomen and elsewhere! What the-…

After a few minutes of realizing that and sort of figuring out what happened, he felt something wrap around his waist. When he turned to the direction, he saw arms, embracing his waist like a teddy bear. When he followed the direction from where the arm came from, he saw the face of somebody he never would have thought he would be seeing in this state. His eyes widened in shock.

'Fuck.'

It was Mukuro…

…and he is naked too…

…To be continued…

A/N: As you can see, this is my very first story! XD But I don't want you to be nice to me... so, if you don't mind, Please Give Me Your Most Honest Opinions! (Harsh, gentle, mild, or whatsoever, I don't mind! As long as your intentions are pure! XD) I know they're all a bit OOC... and, I really have nothing to say to defend myself on that, I'll just try to make them more in-Character next time. Alrighty~ so, thank you for reading! I really enjoyed writing this! Hope you enjoyed reading just as much! Until we meet again!

Lots of Love,

~Nodachin! xD