A/N: Hello there! Another KHR story from me. I know that Fem!27 have been done quite a few times already, but I'm pretty certain that nobody had done this version before. I promise that I'll make this story unique from the other Fem!27 fics.

So enjoy!

Chapter1: Shocking Transformation

It was still early as Tsuna opened his eyes once again to a new day. Today was actually a very special day; one that only comes around once every year. That's right. It was Tsuna's birthday, his fifteenth birthday to be exact. He wondered what the day would hold for him.

Faint sunlight shone through the window and he could make out Reborn, still sleeping in his little hammock with his big eyes opened wide and the sleeping bubble vibrating with every small breath. It was such an unusual way to sleep for such an unusual baby.

Tsuna was glad that his Spartan tutor was still asleep. This at the very least gave him some minutes of peace on the morning of his birthday before Reborn would awake, and as a side affect, the gates of hell would open up as well. After taking the time to stretch his laziness away, he slowly stepped out of bed and ruffling his messy chestnut brown hair, walked to the grab his uniform from the hanger on the wall.

Tsuna stared down at the Namimori Junior High School uniform in his hand and smiled. Before he would despised going to school. It was probably the most horrible place in the world for him. The only reason that kept him going to the place he dreaded so much was Sasagawa Kyoko, his crush. She was his sunshine that lighted up the downcast world of his. All of this, however, was before Reborn came into his life.

No matter how much he hated the devil tutor and the ridiculously harsh training the hitman put him through, he had to thank him for showing up. It was all because of Reborn that he was able to gain new friends. Whether it was Gokudera, Yamamoto, Ryohei or even Lambo, I-Pin, Bianchi and Haru, he had gotten to know all of them through Reborn. He even got to be good friends with Kyoko when before, they hardly even knew each other; or at least she hardly even knew him.

After washing and brushing up and getting into his school uniform, Tsuna reached for his school bag and carried it downstairs, where breakfast was waiting for him. He was on the top of the stairs when suddenly…

"Hiiiiiiii!"

…he fell down the stairs.

From where he was laying down, Tsuna turned his head to the side and saw a banana peel laying beside him.

"Gwahaha! Dame Tsuna slipped on a banana peel! That was so stupid!" someone laughed.

Tsuna sighed. He recognized that raucous laughter. It was none other than Lambo, the loud mischievous hitman from the Bovino family.

"Dame Tsuna, how much longer are you going to continue embarrassing yourself like this?" another person said, jumping on top of Tsuna who was still sprawled on the floor.

"Reborn! When did you get up?" the brunet shouted.

Reborn shook his head in exasperation. "You can't even notice the simplest thing can you? You make great tutors like me feel ashamed."

Tsuna resisted the urge to roll his eyes in front of Reborn. Not only did he have a merciless devil for a tutor, the guy was even full of himself. The Arcobaleno was such a narcissist.

Struggling to get up onto his feet and making his way to the kitchen, Tsuna was greeted by two familiar faces.

"Happy Birthday Tsuna!"

"Happy birthday Juudaime!"

After recovering from the shock of seeing both of his two close friends early in the morning before school at his house, Tsuna allowed a smile to creep onto his face. "Arigato, Gokudera-kun, Yamamoto."

"Breakfast is ready!" Nana called out to everyone as she set down the last plate of food onto the table.

"Sugoi, there's so much food for breakfast," Tsuna exclaimed, staring down at the table filled with different dishes.

"Of course! It is Tsu-kun's birthday after all," Nana said, giving her son a loveable hug.

"I also brought sushi from my dad," Yamamoto said, holding up a bag that contained bento filled with sushi.

"As expected of Yamamoto," Tsuna remarked, smiling. "Thanks a lot."

Gokudera let out a low grunt. "I may not have brought you anything Juudaime, but I swear to you my absolute loyalty!" he announced, bowing down in front of Tsuna.

Tsuna sweatdropped as his friend fell face down at his feet. "Arigato, Gokudera-kun. You can get up now."

To his relief, Gokudera shot back up as he was ordered to.

Yamamoto chuckled as he watched the two.

"What are you laughing at, baseball idiot?" Gokudera shouted at Yamamoto, giving the baseball player a deadly glare.

Yamamoto just smiled at him, before turning to Tsuna. "Well, Tsuna, as for me, I promise to be by side and protect you no matter what."

"Hey, that's my line!"

"Come on, let's eat now or else we'll be late for school!" Tsuna stated, hoping to stop the ruckus that was about to break out anytime soon. "By the way, where's Bianchi?" he asked, noticing that the Poison Scorpion wasn't around. Normally wherever Reborn is, she would be there too.

"She went to pick some people up," Reborn replied. "Let's eat," he said, ignoring Tsuna's questioning look.

When the group all finished their large delicious meal of breakfast, they all headed for school together.

"Happy birthday Tsu-kun!" Kyoko greeted, Tsuna as he set his bag down on his desk.

"Arigato, Kyoko-chan!" Tsuna said, his face filled with extreme happiness. She was his crush after all. Her actually coming up to wish him a happy birthday was probably the best thing that he could ask for on this day.

He was even more surprised however, when she handed him a nicely wrapped small box. "For me?" he asked, pointing an unsure finger at himself.

Kyoko nodded.

Grinning from ear to ear, Tsuna eagerly accepted the box. It was so neatly and beautifully wrapped with brightly colored wrapping paper that he didn't want to rip it open. It was part of Kyoko's handiwork. He didn't want to ruin it.

After what seemed like many minutes of carefully pulling the tape off and removing the wrapping paper, he finally opened the lid. Inside was a cross stitched of his name inserted inside a plastic covering that made it into a keychain.

"Thank you so much, Kyoko-chan!" Tsuna said. He was at the moment putting all of his effort into preventing himself from jumping up and down with happiness like a kangaroo.

Kyoko smiled. "Glad that you like it."

"I love it!" he exclaimed.

The female student giggled. "By the way Tsu-kun, what time were you born?"

Tsuna looked thoughtful for a moment. "Um…I think it was around 10:16 in the morning."

Just then, the bell signaling the start of class rang and everyone took their seat.

Everything was going along as usual until it came to the middle of second period.

Tsuna yawned and stared out of the window as the teacher droned on about something that had to do with World War II. His attention at the lecture started to completely slip away from him when suddenly, a sharp pain shot through his head. Tsuna winced and clutched his head. The sharp pain lessened, but it didn't completely go away. He looked up at the clock and saw that it was already 10:05. Just eleven more minutes to go before the end of class. He'll go get something at the nurse's office after class.

However, in a matter of seconds, his head was throbbing even more. Not only that, but his whole body felt hot. Was he starting to catch a really bad cold or something? Maybe he should go right now. He tried to raise his hand, but for some reason, he didn't have the strength to do it. His whole body suddenly felt weak. Before he knew it, he couldn't even sit up straight. He felt himself staring to fall out of his chair.

A second later, he felt someone's arms around him. Forcing his eyes to open, he looked up and saw his Rain Guardian by his side.

"Yamamoto…"

"Tsuna, are you alright?" Yamamoto asked, with a worried disposition.

"Yamamoto, would you mind taking Sawada to the nurse's office?"

Tsuna felt himself being pulled up onto his feet and supported by his friend across the classroom. He caught a glimpse of Gokudera who was already out of his seat and was about to follow. He gave the Storm Guardian the most reassuring smile that he could and shook his head. He didn't want to trouble all of his friends.

Once the two reached the nurse's office, Yamamoto slid the door open with his free hand and seeing that nobody was inside, went ahead and laid Tsuna down on the bed.

"Tsuna, you're burning hot," Yamamoto remarked as he felt Tsuna's forehead and his arms. The Sky Guardian's whole body was warming up rapidly. "You need to go see a doctor. Let me get some wet cloth for you and I'll tell the teacher to call your mom," he said, exiting the door.

He was now really worried about his friend. He couldn't remember ever seeing Tsuna this sick before. It was starting to scare him. Yamamoto went ahead to the bathroom and opening the facet, allowed the water to run over his handkerchief, soaking it.

The bell indicating the end of class at 10:16 rang as he just exited the bathroom. It was then that he heard a hit-pitched scream coming from the direction of the nurse's office.

"Tsuna!"

Yamamoto raced back towards where he had left the brunet.

"Tsuna, what's wrong?" he asked with a tint of panic in his voice. Getting no answer, the baseball player walked over to the side of the bed where he had laid Tsuna down earlier and came to a complete halt.

Who is that…?

The long silky messy chestnut brown hair that reached chest length, the big oval eyes with the same color, the perfectly shaped nose, thin red lips and face that bore a light shade of pink at the cheeks, the slender figure, broad hip and the curve of the body were all the characteristics of the small female student in male uniform that was lying down on the bed.

Her eyes were filled with shock as she stared down at her own body and started doing something that normal beautiful cute girls wouldn't do. She started to feel her whole body. The slender fingers of her small hands raced through every inch of her body as if it were something completely new and strange. Her panic increased with each touch. She then faced the person in front of her with wide eyes.

"The thing that is supposed to be there isn't there," she said in a weak voice. She then unbuttoned the outside jacket of her school uniform. "Yamamoto...what on earth are these?"

BANG!

The poor male teen couldn't take anymore of the scene in front of him. He dashed back outside and slammed the door shut behind him, his face a deep crimson red. Yamamoto couldn't believe what he was seeing.

Tsuna…!?

"Hey, baseball idiot, did that scream belong to the tenth?" Gokudera ran up to the still shocked Rain Guardian.

Yamamoto was still too stunned to answer.

Frustrated at not getting an answer from the other guardian, Gokudera ran into the room himself. A few seconds later, he was back outside again, his face just as red as Yamamoto.

Both of them faced each other.

What on earth was going on!?

A/N: That was an extrememly short chapter. It was probably the shortest chapter that I have ever written before. Anyways, the next ones will be longer. Please review and tell me what you think!