Title: One Week Disaster!
Summary: The Mafia World is taken by storm as a certain Vongola Decimo is turn to a girl by a failed invention from their mechanics which they don't know how to undo it and might take a week to undo. Worse, the boss-turned-girl is in her PMSing period!
Disclaimer: I don't own KHR even if I really wanted to.
Black-chan: Somehow this is like a sequel to 10 Reasons Why Tsuna Can't Be A Girl but can be read separately! I got some requests of me writing a Fem!Tsuna PSMing and I was interested so I tried it out. Hope you guys enjoy it... Oh yeah, mayor OOCness from Tsuna's part.
Revised: 01/01/14

.oxo.

It was a nice and peaceful day. The sun was shining brightly and everyone was outside laughing and smiling. Nothing was wrong... Well, it was.

"WHAT?!"

There came a big lightning strike to one house like in horror movies and in one room, a female long-haired brunette was looking like an angry lion at the three males in the room as if they were annoying enemies or preys.

One of the three males, a red-haired, awkwardly and nervously, was looking anywhere but the angry teen.

Another, a black-haired, apologized for whatever they—mostly he—had done, looking rather sheepish.

The last, a calm looking blonde, merely stared at the girl with indifference and bluntly said, "Young Vongola, it's like we had said a while ago. The invention failed and exploded and we don't know how to turn you back to normal."

A visible tick was found in the brunette's head and you could just see the other two males looking at their companion in horror—one even looked like he was suffering from a stomachache.

"So you're telling me I'm stuck as a girl..."

The female's voice was awfully quiet and calm which made the three mechanics shiver from various reasons—mainly their fear of their lives.

"ARE YOU FUCKING KIDDING ME?! GET YOUR ASS WORKING AND FIND OR MAKE THE DAMN CURE!" she shouted, anger clearly noticeable by her tone.

The three mechanics, who without a doubt scared for their lives and what the girl would do as the girl was literally breathing fire, immediately left the room and tried to do what was told. Invent a cure.

Though, they were still a little confused about the girl's attitude to them. They didn't even know she could swear!

They, however, knew it was probably a girl's thing.

"Spanner, do you think he's—er, she's in her...you know, period?" the red-haired asked his blonde companion who seemed to be sweaty and panicky when they were in a large distance to the previous house.

"High possibility, Shouichi," Spanner said in a worrisome tone, making the other two stare at him in shock of the tone. "Even higher possibility is we're going to die if we don't hurry."

Now, they understood exactly where this was going.

Their boss was kindhearted alright but they knew that when angered he was scary and now that he was a she who was in her monthly period, their boss would most likely have the deadly mood swings of the women.

"Do you think we should tell the others?" Giannini, the black-haired mechanic, asked worriedly knowing full well what a woman could do in her time and he would likely tell anyone it's not a nice experience.

"I already told Reborn about the situation and I'm sure he had told the guardians," the blonde mechanic stated, recalling the time when their invention messed up which was three hours ago.

It was practically like any day and they wanted to try something different so they build an invention to make a person became an animal for a while.

Though, Giannini kinda picked a wrong ingredient and caused it to explode.

And Tsunayoshi or their young boss had coincidentally come in and got shot by a beam of light escaping from the explosion.

And bam! He was now a she.

So after that, Reborn, their boss's tutor and mentor, had volunteered to tell everyone about it much to the brunette's dismay.

"So I'm pretty sure, the Vongolas are well-informed," Spanner continued, shaking his head from his thoughts for now and added merely to himself, 'Though, they wouldn't know about the mood swings unless they put one plus one together.'

They were quiet for a minute, walking into the quiet road towards their invention room before someone interrupted the peacefulness.

"Do you think they'll survive a PMSing Tsuna-san?" Shouichi questioned only to meet an very uncomfortable silence.

"..."

"..."

"Poor Vongolas."

...

Okay so Tsuna knew his life was weirder and dangerous and just freaking crazier than most his age but this was too much!

He could take on any enemies—heck, he took on an ex-convict who turned out to be his mist guardian, a scary man who became one of his ally-slash-enemy-or-simply-anti-hero, freaking strong babies who were actually adults and etc. and etc!

But this!

He stared at the reflection of the mirror in front of him.

There, looking angry and pissed off as hell, was a female long-haired brunette with honey-brown eyes who was wearing a slightly big clothes for her and pants that were too big and boyish for a girl.

'WHY ME?!' he screamed in his mind angrily as he proceeded to think of how unfair and simply unlucky his life was and couldn't stop the swears from muttering under his breath. "Fuck...fuck, fuck, fuck, FUCK!"

Maybe, it was the hormones of a female as to why he was acting this way but the boy-turned-girl simply didn't care or give a fuck.

He turned into a girl!

He was a she!

And fuck, was he—she, pissed!

She also felt a really annoying feeling between her chest and she swore again, throwing her t-shirt aside, revealing the real evidence that she's now a female.

If she was in her normal state, she would have blush or fainted from the spot but she was not.

She simply didn't care much of it and quickly looked over her closet for any clothes that would make the strange feeling in her chest.

Fortunately, she did found one.

However, she wasn't ready for the door to open suddenly, her right-hand banging in so unfortunately, she was still shirtless and there's someone else in her room.

Worse, it's a boy.

"Juudaime! I'm sorry I'm late! I just heard from Reborn-san you were turned into—" Gokudera, her right-hand and storm guardian, stopped and stared wide-eye at the sight of his boss as a female—a shirtless female, might I add.

Unnoticed by himself, he glanced at the chest area of his boss, still shocked at what he was seeing and felt blood coming out from his nose.

Though, Tsuna did notice this action and—mind you, she was not amused and hell would she even forgive the male—even if said male was her best friend and right-hand.

"PERVERT! ECHII! HENTAI! BAKA! GET OUT! OUT!" she shouted with the reddest face. Her right hand was covering her chest area protectively while her other hand was grabbing anything she could grab and throwing it to the boy.

Gokudera, paling and feeling a sudden heat to his face, ducked and tried to dodge everything that was thrown to him like the hair comb, pillow, clothes, books, bag, simple chair, big lamp, and yes, it was getting heavier and much painful objects to dodge every second.

He wondered if he should have just leave the his boss which was now a female alone.

"I SAID GET OUT!"

He stared at Tsuna in disbelief.

Was that the bed in his boss's hand? Oh uh, he really need to get out now.

"HIIIYYYAAAA!"

Too late.

"AH!" Tsuna blinked and shouted in horror as she realized what she had done. She kneeled down to the ground, clenching her storm guardian's hands, forgetting about her little problem in her chest area. "Gokudera-kun, gomenasai!"

"Juuda—" Gokudera managed to mumble weakly before fainting again due to being close at the now female boss with—

Yup, he just looked at his Juudaime's still shirtless chest and got a major nosebleed.

"Eep! Gokudera-kun?!"

...

"Juudaime, I apologize for such disrespectful actions! I am not worthy to be your right-hand! I will commit suicide right now!" Gokudera bowed dramatically.

It had been thirty minutes since the incident happened so Tsuna was able to put on a pretty decent t-shirt before the bomber woke up. Strangely enough, her mother didn't seem to be home.

Well, not that she would like her to.

She really didn't want to know what would happen if her mother found out that her son suddenly turned into a girl.

"Haha! Maa, don't worry about that, 'Dera!" Yamamoto, who came right after Tsuna was able dress up properly, said cheerfully, not at all bothered that his best friend-slash-boss was now the opposite sex or the fact that his other best friend was close to hell's door.

"Yamamoto-kun's right, Gokudera-kun. It's not entirely your fault so please don't blame yourself, nee?" Tsuna pleaded, smiling at the boy, not knowing she just made a cute and girly face that caused both boys to slightly blushed.

Though, it did bother the female why she was easily angered like the time with the three mechanic. Maybe, she ate something wrong a while ago?

Obviously, the boy-turned-girl knew absolutely nothing about the girl stuffs and their mood swings.

"Umm...," she suddenly sighed, making the two boys look at her in worry.

"You okay, Tsuna?" the rain guardian asked worriedly, knowing girl's were more fragile than boys.

The storm guardian took that as offense. "Of course, he—she isn't! Juudaihime is now a girl! And girls are weak!" he shouted angrily at the taller teen, not knowing he indirectly insulted his boss.

A vein popped to the only girl and the temperature suddenly dropped, making two boys shiver from the sudden coldness.

They stared at their sky who was smiling at them too sweetly in a hint of fear.

But fortunately for the two, before something bad happened to them, some people suddenly came to the room.

"Tsuna-kun/san!" a light brown-haired girl and a dark brown-haired girl called out in unison to the Vongola Decimo and the said Decimo blushed, knowing the two girls and feeling embarrass that they saw her as a girl—especially since one was her crush when she was still a boy and the other had a crush on her.

"Oh, it is true!" Haru, the dark-haired female, squeaked happily and loudly, hugging the now turned-girl boy. "Tsuna-san's a girl now!"

Tsuna, completely forgetting her earlier anger, sweat-drop at the actions of the girl who liked her when she was a he and couldn't held a comeback from escaping her lips, "Thank for the useful observation, Captain Obvious."

Kyoko, the light-haired female, stared at the brunette and let out an "ah" after realization hit her and she took out a red lollipop from her pocket.

"Here you go, Tsuna-kun," she held out to the female and said female brightened immediately, taking the sweet quickly from her hand and licking it blissfully.

Tsuna seemed to be distracted now and the two boys couldn't help but ask the sudden change of attitude of their boss.

"Tsuna-kun must not know it but since he was suddenly a girl now, he might be experiencing the monthly problems for girls only," Kyoko explained, not at all awkward at the topic and the other three quickly caught on what she was telling them.

Though, they were not stupid enough to say it out loud and say the word bluntly.

Well, some of them.

"So, she's in her period, huh?" Yamamoto asked with a smile, not knowing it was a taboo not to tell that word in the hearing area of the girl experiencing—or in their case, Tsuna, the boy turned girl.

"Baka! You—" Gokudera's insults and voice was interrupted with the temperature dropping to 0 degree and the dark aura surrounding a silent girl.

They flinched at the sound of a candy breaking and paled at the burning anger in their friend's eyes.

"What did you just said?" Tsuna asked quietly, her teeth twitching in anger and her eyes looked murderous unlike her usually kind eyes.

"He's dead," Haru deadpanned as she slowly moved away from the now trembling baseball star and she stared at the other two with eyes just asking "think we should help?".

Gokudera paled at that and quickly injected, "You want to fight a female mafia boss PSMing?"

Though, even if his boss was not PSMing, the storm guardian would surely not fight his boss but yes, he wasn't kidding with what he had asked.

He had an assassin for a sister who clearly scared him to death with just the face and worse came when his sister was PMSing.

It would be no different to a kindhearted person like her boss. Actually, kindhearted females were the worst to angered when PSMing.

Kyoko silently agreed since she was like Tsuna in a way so she knew the boy-turned-girl would be scary like herself when at this pace.

But then again, Tsuna wouldn't kill someone so it's fine, right?

"Oi! Tsuna! I'm sorry! I give!"

Bam!

"Stop throwing stuffs already!"

Bang!

"Shit! Is that the refrigerator?!"

Boom!

"Eeeeehhhhh?! Yamamoto-kun?! Did I...? I'm sorry!"

...

"I'm really, really, really sorry, Yamamoto-kun!" Tsuna apologized for the nth time by now, her eyes watery and her hands together in a begging manner.

Kyoko, Haru and Gokudera took a picture of her cute actions happily while Yamamoto just laughed it out, not bothered that he had almost get killed by his best friend.

They were now in a candy shop with cakes since cakes or any sweets made the girl calm down and not burst in anger.

And yeah, Tsuna's eating it all out and her three friends wondered where in the hell those sweets were going.

There went 20 short cakes, 30 ice creams, 15 banana split, 30 lollipops, 20 candies, and counting and etc. in her really small stomach.

Oh, yeah... It was only five minutes since they started eating.

"Sweet~" she squeaked girly and blissfully as if she wasn't a boy before, eating a vanilla cake with strawberry fillings now. "So good~!"

Kyoko and Haru looked at their food simultaneously which was just a couple of sweets and cakes and thought at the same time, 'And some people think I eat so much!'

The two boys, who seemed awkward at being inside the shop where no boy seemed to go, slowly ate their cakes when a thought came to them. 'Who's going to pay for the sweets and cakes?!' they thought, not knowing they had the same thought and sighed in distress. 'All my money isn't enough for what Tsuna/Juudaihime ate!'

"Oh yeah," Tsuna started, licking her strawberry ice cream now. "Who's going to pay the bills? I don't have money."

"..."

"..."

All of them stopped and paled at that—the two boys paled harder as they already knew what's going to happen.

The three girls stared pointedly at the boys and they cringed.

They just lost all their money in one day.

...

Tsuna smiled happily, walking with her friends. 'Maybe being a girl isn't that bad after all,' she thought, not really remembering the time when she loss control in anger three times a day.

'At least, I'm not getting harassed or flirted to, right?'

Tsuna should really know there were words like "jinx" or "understatement" in her life whether she's a boy or girl.

"Hey, cuties, why don't you ditch those two weaklings and come with us?" a really stupid and clueless delinquent asked, his arm laid in the so-called girl's shoulder who was awfully quiet.

Two other delinquents were also with the other two girls who looked concerned—for them, mind you.

But prey tell, would delinquents survive the wrath of two protective guardians-slash-best friends of a mafia boss—or the mafia boss himself?

However, the idiots knew nothing of this and the leader even dared to lower his hand to Tsuna's you-know-what and did something unforgivable.

The eyes of the two guardians made the gang flinched in fear but they flinched and paled with shivers as they stared at the dangerously quiet girl who looked back at them with looks that could kill and revive and kill again and again.

"PERVERT!" she shouted at the top of her lungs, sending the delinquent flying to the end of the world. She left the other two who were trembling in fear and walked away with killing intent so high, it made her friends backed away a little.

Her friends made a mental note never ever grope Tsuna or pay the consequence.

Though, it was a good thing, Kyoko still had a lollipop which she gave to the furious PMSing girl to calm her down.

"Oya, oya, so it is true. The Vongola really is a female now," a familiar and unwelcome voice made the two boys groaned in annoyance—yes, even the baseball freak.

'Out of a pervert and in with the king of perverts.'

Tsuna didn't seemed to mind the newcomer—but mostly cause she was enjoying her lollipop—though when she did realize that the newcomer was in fact her male mist guardian, she nervously greeted him, "H-hello, M-mukuro. What are you doing here?"

"I'm just checking if what the arcobaleno told me was right," Mukuro answered, examining the girl with his mix-colored eyes and 'hmm'ed. "I was expecting a larger size than this."

"Huh?" the young Decimo blinked in confusion but it turned into horror as the sly illusionist put his hands around her chest area and grabbed her—er...

"So you are just an A-cup, kufufufu," he mumbled with a pervert glint and smirked at the dumbstruck faces of all of them.

"YOU."

Funny how one word was filled with malice and anger and just screamed "I'll kill you!".

If the others were afraid of Tsuna then, now they were terrified and equally traumatized by the said boy-turning-into-a-girl.

The lollipop that she had been licking cracked in her mouth and she stared up with the mist guardian with a sweet and innocent smile that made anyone shiver. The temperature around was clashing in heat and coldness.

And her face—

Shit!

Her friends double took.

She had opened her eyes and those normally honey-brown eyes were narrowed sky orange eyes. And on her head were a big orange flames raging in anger.

She went into Hyper Dying Will Mode without a bullet or those special pills!

"Nee, pineapple head-san, should I teach you a lesson about that so-called size~?" the mafia don smiled wider if possible and she cracked her knuckles, the other four flinching at the breaking sound.

Tick.

"Kufufufu, let's see, flat-chest~" the ex-convict smiled as well with his signature laugh, making the other four just stared at him as if he grew another head or if he was crazy—oh, wait, he really was.

Tick.

"Oh, I would but then I remember I can't possibly teach a fruit so I guess it's a no now~"

Tick.

(On the background, the four forgotten friends gaped at their boss/friend. 'Did Tsuna-kun/san just?' the girls thought wide-eyed while the boys mumbled slightly with jaws dropped, "Oh burn!")

"Unlike you who is most likely a milk-hearted, I am definitely not a fruit."

Tick.

(Gokudera wanted to just throw bombs at the pineapple-head but his boss was too close to the said pineapple while Yamamoto wanted to say something like "I like milk!".)

"I and many people so happen to like drinking milk, Piney-chan. How about you? Don't cha like to eat pineapples? Oh wait, is that cannibalism?"

Tick.

(Hibari who watched from afar smirked at that. Wait! When did he arrive? Oh, right. This was Hibari Kyoya so no surprised there.)

"Kufufu, isn't drinking milk also cannibalism, milky?"

Tick.

(Kyoko held out her cellphone and seemed to be recording everything that happened starting from when she met Tsuna as a girl.)

"Oh, isn't your insults weakening? And for your information, drinking milk isn't cannibalism since I'm not exactly eating anything, am I? And also, you didn't disagree to my last question. Does that mean you really are a cannibal?"

Tick. And sweat.

(Hibari smirked wider, Kyoko and Haru giggled like fan girls, Gokudera was like "That's my Juudaime!" and Yamamoto just said two words, "Double burn.")

"Kufufu, I have you know I am no such cannibal as you speak and at least, I'm not named after a tuna fish."

Tick.

("Tuna?" Yamamoto blinked in confusion before he exclaimed in realization, "Ah! It really does sound like Tsu—" He got hit by a ball thrown by Tsuna who somehow heard him.)

"You, cockalorum bastard! AT LEAST I DON'T FUCKING HAVE A HAIR THAT FUCKING MAKES ME GO TO A TRIP TO THE FUCKING TROPICAL LAND!"

Dumbstruck.

Everyone, even the school perfect who raised an eyebrow at her words, stared at the young Vongola who glared furiously at the stares.

"What?" she asked as if what she just said was normal.

"Cocka—what?" Gokudera, the known genius, asked, even he did not know the meaning of that word.

"Tsuna curse?" Yamamoto asked in disbelief that his usually kind boss was cursing on top of his mouth.

"Tsuna can insult someone?" Haru asked the question that was bugging her since the in Insult Competition started.

Kyoko said nothing and seemed to have a trouble holding her giggles.

"Wao," Hibari, the bloodthirsty perfect, smirked oh-so-smugly and positioned his tonfas, quickly dashing to attack. "Fight me, omnivore!"

However, a trident stop the attack and he glared at the one who interrupted.

"Kufufu, birdy, she's my prey," Mukuro said idly, his usually smirk that promised nightmares in his face. "Not yours."

And said girl seemed to still be angry—still in HDW Mode and moved in between the two, a sadistic smirk planted in her face.

"I'm neither you two's prey 'cause you two are my preys~"

Boom!

There went a perfect road. Wonder how they could explain how a huge part of the town was destroyed.

...

Tired. That was the only thing that could explain what Tsuna felt as she fell on her bed. Her whole body was aching from her fight from her two dangerous and bloodthirsty guardians.

"Congratulation, you survive the first day, Dame-Tsuna!" the mocking comment of her tutor made her glare at said tutor and asked—more like, demanded, "And where have you been?!"

"I was really thinking you'd die really as soon as you became a girl. Lucky for you, I wasn't right," the baby continued on, ignoring what the girl said.

Though, the girl didn't seemed to mind and seemed to like it after getting too much attention earlier.

"But I guess you'll have it rough since Spanner just informed me that it'll take about a week to make you a boy again."

The small sky stared at the hitman and blinked.

"WHAT?!"

(Somewhere, different boys and girls felt as if the gods were cursing them.)

It was really a good thing for the young boss to be too tired—cause if the glare was an implication enough, Reborn would have been dead.

Anyway, after some hours later, Tsuna needed a bath and and she was in hell of a shock at what she saw.

Again, she was glad her mother still wasn't home—or was in a vacation.

"REBORN! I'M DYING! THERE'S BLOOD IN MY BUTT!"

.oxo.

End or TCB...?

Black-chan: Well, that was fun~! So you guys think this should be a one-shot or a seven chapters?

Notes: PSMing!Tsuna = Bipolar!Tsuna xD And haha, I must have a grudge against boys since I kept on messing with them via Tsuna! And also, it seems like the only guys that doesn't have that much trouble with PMSing Tsuna are Kyoko, Haru, Hibari and Reborn (Oh, wait. He's going to explain about the you-know-what to Tsuna so it'll be troublesome for him!) xDD And finally, Mukuro totally got owned by Tsuna~! xDDD By the way, I was thinking of making Mukuro call Tsuna "no assets" but then I just went with "flat-chest"~

Oh yeah, if there'll be like a next chapter, you'll get to read more PMSing!Tsuna, Reborn's explanation to Tsuna, girl stuffs, Xanxus meeting the PMSing!Tsuna (Oh, god, that'll definitely be a good laugh xD), cooking, and Nana's reaction to Tsuna's new gender! xDDD

Well, anyway, thanks for reading and please review~! ;)

New Note: I'm revising it. Fixing some grammar error I can see but I'm still study English and it ain't my first language so I might not notice all the mistakes. If you guys see some, do any of you mind PMing or reviewing about it?