DISCLAIMER: Katekyo Hitman Reborn and the characters belong to Amano Akira respectively. I own nothing but the storyline. Though, I'm not getting any profit from this and I'm not sure if this thing can make me a fortune. I know for sure the inspirations that I got while I'm here would make me one.

Chapter 4 – The Hereditary Enemy

"It's the first day for Aoi to be in school today, I hope she'll be fine…" Mukuro said while helping Tsuna drying the clothes out in the sun.

"Ah, it's today? Which school, is she transferred to…?" Tsuna asks as he hangs the futon as he took a day off for Mukuro.

"Your old middle school, Namimori Middle school…"

Tsuna halts in the middle of hanging a heavy futon.

Mukuro that sees that the futon still in Tsuna's hand, he calls out to him. "Tsuna, are you posing yourself as a hanging pole…?" there a hint of musing in his voice.

Hearing what Mukuro said to him, he notices that his leg starts to get shaky. He hangs the futon as fast as he could and heaves.

"Namimori middle school you say…?" Tsuna looks at Mukuro that sits on the veranda, with a worried face.

Mukuro look at him as one of his eyebrows raise elegantly while pouring the orange juice for both of them. "Hm?"

Aoi feels so nervous while waiting for her name to be called out to get introduced by the teacher. She can't stop tapping her left feet, a habit that her father tries to change but to avail. She writes the word 'people' in kanji on her palm and then swallows the word to calm her nerves. Then, she hears her name being called, she opened the sliding door and then walks to stand next to the classroom teacher.

"Guys, this is the new transfer student. She's been transferred from Okinawa due to her father's job. Come on Rokudo-san, introduce yourself…" the blue short-haired female teacher said cheerfully.

"Yes. Nice to meet you, my name Rokudo Aoi, since I'm new here, I might need your guidance. Please take care of me…" she then bows to the students.

The teacher clap her hands once. "Alright Rokudo-san, please seat over there…" the teacher pointed to the empty seat next to the boy that have a menacing glare.

Aoi looks to her teacher, as if asking was she really need to sit next to that boy, but her teacher just nods while smile brightly. Aoi sighed, then walks to her seat wearily. Once she gets to her seat, she greets the boy to be more friendly.

"H-hello…"

The boy only takes a glance at her and then shifts his eyes towards the blackboard. "Make a lot of noise, I'll kill you!" he murmurs the deadly threat to Aoi.

Aoi taken aback, she heard a thunder in her head. Her facial expression changed. "As if you can…" she says as she smirking towards the boy.

This time that boy is the one that's taken aback. In an instance, he felt a murderous vibe coming from Aoi making him feel a bit excited. He looks at Aoi directly as a dare to bring whatever she's on.

All the students in the class felt cold and shivers, same goes to the teacher. She pauses from writing on the board and turns around to see her students, that's when she sees Aoi and Ryuu glare at each other. The teacher, Nagi-Sensei sighed; probably having Aoi sitting next to Ryuu is not a good idea after all. Aoi, a daughter of Rokudo Mukuro and Ryuunosuke is…

PUFFF—!

Orange juice sprays out from Mukuro's mouth. "… Hibari's son…?"

Tsuna is scratching his not so itchy temple. "Well, yeah… I heard that Hibari's son that wanted to enroll into the school…"

"Kufufufu… that's interesting…" Mukuro wiped the corner of his lips with the back of his hand.

"Huh…?"

Mukuro gets up and pats his jeans at the bottom a little. Smirking as he looks at the sky and feel the breezes brushes his long side bangs lightly, then he look at Tsuna. "I'm going for a little walk, Tsuna…"

Tsuna already imagines bandages and the smell of antiseptic, he slaps his forehead, he should've known this would happen sooner or later. "Don't get into trouble, Mukuro…"

Mukuro look at him feeling amuse. "What are you talking about…?" he smirks. "I'm just going to have a little chat with a long time friend that I missed so much…" Mukuro walks out after he takes his leather jacket.

In Tsuna's mind, bandages and antiseptic wouldn't be enough, he's need to prepare a wheelchair or crutches or worst, a stretcher.

::::::::::

Come back to the little rivals of grade six in Nami-chu. Aoi eat her lunches brutally under the shade of a tree, her thoughts full of the raven haired boy named Hibari Ryuunosuke; she managed to get his name by asking some of the kids in her class. He actually threatens to kill her just because she said 'hello'. Her sandwich squished on the side as she fisting her hand.

"I'll show him what fear is…" she said behind her gritted teeth.

"Show fear to whom…?" a manly voice asked from behind her.

Being oblivious, she just answered right away. "To that devil name Hibari Ryuunosuke that sitting next to me!" she turns around after she realized something. "Ack…!"

"So, may I know what my son did to you, for you to have against my son…?" the dark haired man asked menacingly.

Aoi gulped her saliva, this is unexpected. She met a disciplinary teacher in not so good way, moreover, he overheard of her wanted to do bad things to his son no less. But this Rokudo Aoi, her father has never taught her to retreat before the attack.

"Hibari Sensei, to tell you the truth, he's not doing anything but his threat to me is unforgivable. I'm arming myself before anything happened, so I'm not in the wrong!" she said sternly.

Hibari quiet for a while and then he smirks. "I didn't say anything about who is in the wrong…"

Aoi really taken aback.

"I came here to ask you something, are you Rokudo Mukuro's daughter…?" he asked in a low tone voice, but it still sent shivers to Aoi, just like his son.

"Yes, I am…"

Hibari looks away from her while still smirking. "Good, he has returned…" then he walks away from her.

Aoi look at Hibari dumbstruck. She got away with no harm. "Wha.. That's it? I-I'm okay…?" she murmurs.

And the bell rings for the afternoon session. Aoi quickly picks up her stuff and runs to her classroom, and as she runs, she takes a look at her disciplinary teacher over her shoulder. She felt, somehow, the teacher almost resembles her father. She shook her head, her father is better. On her way to the class, she meets her rival again, looking at her menacingly.

"What…?" she takes a step back.

"Hn…" he smirks, then walks calmly into the class.

Aoi gritted her teeth out of anger.

::::::::::

Mukuro smirks as he standing outside of Nami-chu's gate because he could see his dear 'friend' is standing right behind the gate too.

"You sure have the guts to actually show your face here…"

"Kufufufufu… If I knew that you became a teacher, I'll come here wearing tie and coat…"

Both of them clenching their teeth until they hear a school bell rings and the school gate opened by an awkward guard. The kids start to run and rush out of the school area but the two man remain at their standing place, glaring at each other.

"I came here to pick up my daughter, and since I promise Tsuna that I only have a little chat with you, I need to restrain myself…" he frowned as she smirking. "… What a waste…"

Hibari narrowed his eyes until he feels his trousers being gripped, he looks down only to see his son standing next to him. "Who is this man, tou-san…?"

"A maniac…"

"Papa!" Aoi calls her father with a joyful voice and a joyful smile, that until she sees Ryuu. She walks slowly to her father and standing next to him. "Papa… do you know our disciplinary teacher…?"

Mukuro smirks. "Kufufu… somewhat, he's a friend of a friend of mine… very dangerous…"

Hibari's lips curve up as his eyes glistening with excitement. "What's this…? A pot that dare call a kettle black…?"

Aoi and Ryuu take a step further from their father as they could a murderous intent from the both fathers. Aoi startle when someone had put his hand on her shoulder, as she tilts her head, she sees her dear uncle Tsuna.

"So, I'm not late…" he heaves so bad as if the oxygen he sucks in is not enough. "… God, I'm already too old for this…"

"Pathetic…" both Hibari and Mukuro spouted.

A vein popped on Tsuna's forehead. "Who do you think makes me like this… you, you…" Tsuna lowers his voice as the both of his dangerous friends smirking at him dangerously. Tsuna wiped his sweat on his forehead with his sleeves. "… God, why do I even make a friend with them in the first place…?"

"Uncle Tsuna!" Ryuu plops on his stomach with a hug. "… I miss your cooking…!" he said with a smiles

Aoi gritted her teeth feeling annoyed, but then she saw an opportunity, she smirks. "Fufufufu… Well, too bad since I got to eat his cooking every day…"

Ryuu narrowed his eyes while looking menacingly at Aoi.

"Are you saying that my cooking is not good…?" Hibari asks his son.

Ryuu only looks at him for a good minute and then turns to hug Tsuna again. "Uncle Tsuna, make me a Bento once in a while…"

Hibari stunned as he looks his betrayal son actually prefers someone else's cooking. While Mukuro only observes the scene while feeling amused, Aoi that notices her father giggling, she sighed. "You're no better, papa…". At this Mukuro stops giggling and look at his daughter, grunts.

Hibari Kyoya, he is once a head for Nami-chu Disciplinary Committee, after he graduated, he continues on being a temporary teacher at Nami-chu that had he stays after he got several recommendations. After that, he marries a beautiful teacher with a baby that later on naming as Ryuunosuke. Their marriage, then blessed with another child. But unfortunately, their blessings don't last long, she got into a car accident while still pregnant with the baby. The baby that later on named as Ayane manages to be saved since the mother still breathing by the time they got to the hospital and the pregnancy already reach 8 months old. Although his mother is not being on their side, Hibari constantly reminds them about their mother by telling a few stories and shows some pictures. Even though, Ryuu's look almost resembles Hibari, but he takes his mother's round eyes, and Ayane is being said as the exact replica of her mother light brown hair with soft curls.

"How about you come to my house to have a family dinner tonight…?" Tsuna offers.

"Really, I can?"

"Next time…" Hibari pulls his son's arm from Tsuna's waist and growl at Tsuna. "… Did you forget? You promised your sister that you'll teach her maths tonight…"

Ryuu makes an O-shaped lips. "I almost forgot… next time uncle Tsuna, I'll be sure to go there…"

"It's okay if you didn't come at all…" Aoi said with her arms crossed against her chest.

Ryuu turns and stuck out his tongue while smirking evilly to Aoi, then continue to run.

Aoi that saw what he just did, trembles in anger while clenching her fist at her side. "I'm going to rip off that snobbish face of his…!"

Mukuro smirks as he sees his daughter spouting the exact thing he said 15 years ago.

Tsuna shook his head as he covers his face with one of his hands. "Like father, like their children…" he sighed.

How was it...? =D, I know, Hibari's part is small here, but he'll the continues for the next chapter. (err...yay?). Since it Aoi first day at Nami-chu, I make her meet Hibari's son first rather than 'suddenly' Hibari appears for no reason... it just matched that way. Since, I'm in this topic, do you guys still remembers the time when you met your parent's friends' children...? Can you be their friend...? Well, for me, it just start with a smile and then poof! I'm suddenly become invisible...*cries*. Hope you enjoyed for this time chapter, any suggestion are welcome but it'll be fun if the whole secret trade deal in PMs. hehehe... slimy am I...?

See you in the next chappie! bye, bye!