Gokudera nearly dropped his report when he entered the Tenth's office.

Now, being the faithful, respectable Storm Guardian and right-hand man of the Vongola Decimo, standing in the doorway and staring stupidly at his boss would be considered inappropriate.

However finding a familiar looking 4 year old at the desk where a 24 year old should've been made him stop dead in his stracks. The fluffy, gravity-defying brown hair, light brown eyes, too-innocent-for-the-mafia look, heck the kid was wearing a freaking suit and was doing paperwork like it was nothing! Well, aside from the occasional grimace and rubbing of the head as he tried reading Italian.

Something must've happened to Tenth.

The kid looked up at the sound of the door opening, face brightenig into a way too familiar smile, and with a voice that had no buisness being in a 4 year old body, "Ah, Hayato, you're back!"

What the fu- "Language, Hayato." Tenth's voice rang in his head- ...fudge.

A few moments of awkward silence passed as the Mini-Tenth looked at him expectantly. Was he supposed to say something?

Gokudera coughed a little, trying to break the silence. "Erm, Tenth...?"

Mini-Tenth nodded, smile brightening a bit at being adressed. Oh my gosh is that seriously the Tenth?! "Is there something you need...?"

Gokudera blinked at the tiny form in front of him. He was... small. Very, very small, but something in his head screamed at him that 'He's just really short.' and immediately mentally kicked himself for thinking something as utterly disrespectful as that. Mini-Tenth's smile faded a little as his large, emotional eyes narrowed slightly when he noticed he was getting stared at.

Agh! It must be something sensitive! I'm so sorry Tenth! Gokudera tensed slightly at the look Mini-Tenth was giving him, letting his gaze fall from Mini-Tenth to the floor rather awkwardly. He walked over to the desk and put his report down next to the paperwork piling up- Holy mother of rainbows and sunshine he's way smaller up close. "Ah, no... Here's my report for the mission..." Mini-Tenth beamed with the power of a million kittens, puppies, bunnies, and all things cute. It was blinding. "Thanks, Hayato! Go get checked out by Brother, he should be with Lambo in the imfirmary, then you should rest up for a few days."

Gokudera got the feeling he didn't want to ask why they were in the infirmary. He merely nodded and with a quiet grunt, bowed slightly and walked out of the Tenth's office.

One the door closed behind him, all he could do was stare at the wall.

That four year old greeted him just like how the Tenth would. That four year old told him to go to Turf-Top after a mission just like how the Tenth would. That four year old smiled and told him to rest up for a few days with a knowing look just like how the Tenth would. That four year old sounded just like the Tenth and even looked like him...

Was that four year old seriously the Tenth?

No, no that's ridiculous. The Tenth's a grown man, not a kid!

You're in Vongola, anything is possible.

...Point taken.

As Gokudera stared off into space having an internal war over the kid's identity, he didn't notice Yamamoto walk around the corner. The Rain spotted him and where he was, eyes widening in horror, and rushed over to the Storm. The sword user quickly snapped his fingers in front of Gokudera's face, looking for some kind or reaction.

Gokudera jumped at the sudden noise, snapping his stormy green eyes onto amber brown. "WHAT-?!"

A hand instantly clamed over his mouth, as Yamamoto grabbed his arm and dragged him away from the Tenth's office door. Gokudera clawed the taller man's hand from his mouth as soon as they started to slow down after making their way to the infirmary.

"What the hell, Sword Freak?!"

Yamamoto stopped, letting go of the now very irritated bomber. He fixed his gaze on him, dead serious. "Please tell me you didn't mention his size."

Gokudera blinked, raising an eyebrow. "...You mean the Tenth?" At Yamamoto's affirmitive nod, Gokudera shook his head. "No... He gave me a look that suggested it was sensitive when I stared for too long..."

Yamamoto sighed in releif. "Oh thank goodness, he already put Lambo and Ryohei in the infirmary a few days ago when it happened."

"He what?" Yamamoto sighed, turning to look down the hallway where the infirmary was.

"Well it's not really that bad-"

"What happened to the Tenth? Why does he look like a four year old?" Gokudera jumped in, not really wanting to hear about the Lightning and Sun. If they've been in there for days he doesn't think he'd want to know.

Yamamoto paused, pursing his lips. "Well about four days ago, two days after you left..."

~Four Days Ago~

After the Arcobaleno were freed from the curse, and after Tsuna managed to get over having to deal with a six foot Reborn, Verde had taken to researching the Curse, or more importantly, the deaging part. Nobody was really sure why, but they didn't question it.

At some point Verde had visited the Vongola mansion to borrow the Ten Year Bazooka, claiming he could use it to aid in his research.

Lambo had thought that was a terrible idea, because anything Ten Year Bazooka related can't be good, and tried taking the purple time travelling machine back.

Let's just say Tsuna showed up at the wrong place at the wrong time.

After a bit of tampering with the Bazooka from Verde, it's affects were rather odd, reminding Tsuna and a few people who were present at the time of when five year old Lambo broke the Bazooka and only the bodies swapped.

After the rather ungraceful switch in the middle of pure chaos and destruction, Tsuna in all his four year old glory gave everyone a glare (more like pout in that body) and told them to "Shut up and just let him take the damn Bazooka."

He could only hope actual four year old Tsuna wasn't having too hard of a time in a 24 year old body.

Verde was given permission to use the Bazooka to try finding a cure for whatever happened since it was well over five minutes since the switch, and Verde had agreed, so long as he could use Tsuna as a test subject.

Unfortunately for everyone involved a bit of Tsuna's four year old self affected his twenty-four year old mind, and he made it very clear he wasn't some guinea pig.

After several of the staff got sent to the infirmary, everyone agreed to just not mention his size lest they envoke his mini-tantrums once more.

~Back to the Present~

Gokudera gave Yamamoto a long, hard stare. "You're telling me a bunch of trained mafiosi gone done in by a four year old."

"Well technically twenty-four-"

"In a four year old body." The bomber corrected. Yamamoto snapped his mouth shut, but gave Gokudera a serious look as if trying to say 'You have no idea and I envy you for that.'

Gokudera decided he definitely didn't want to know how.

The silver haired man ran a hand down his face tiredly. This was not what he needed after a long, exhausting trip. "So now we're stuck with a four year old running Vongola?"

Yamamoto nodded, "Pretty much."

Gokudera breifly wondered if he got a concussion on his trip and was just dreaming. "An adult in a child's body..." He mused quietly to himself. "That's a dangerous combination."

~Reborn!~

A/N: So basically Tsuna got chibified (or Arcobaleno-fied without being an actual Arcobaleno) and is not happy. This'll likely be a series of connected one-shots that'll go on for who knows how long. I know they're probably a bit OOC, but these guys are the versions who had all the Future crap with Byakuran to put up with, so they grew up a bit differently in comparison with the TYL versions we saw in the Future Arc. I'm open to any ideas for what happens so go ahead and tell me in the reviews.