Naruto: Starting by giving Hinata the Tenseigan!

"Rejoice, mortals! You are graced with the knowledge of my true identity. I am the Dimensional Lord, the Demon Sealer, the wielder of the Eyes of Death, and the founder of the Dimensional End's Congregation!"

Natsuki's voice resonated, as if imbued with a captivating magic, making one truly believe he was a supreme being.

Fortunately, Kurenai, with her strong mental fortitude, mastery of Genjutsu, and years of experience living with Natsuki, only briefly succumbed to the illusion before snapping out of it.

Then it hit her. 

What did he just say?

What the...?!

Has his chuunibyou reached its final form?

Natsuki often acted a bit chuuni at home, but that was behind closed doors, just playful antics she dismissed as childish innocence. 

And no one outside the family knew about it. But now, on the verge of becoming a ninja, with outsiders present... how could he possibly act so shamelessly? How thick was his skin?

Kurenai's first thought was that she hadn't disciplined him enough. 

She felt a pang of guilt towards her aunt and uncle, who had entrusted Natsuki to her family on the night of the Nine-Tails' Rampage. 

She also felt she'd let down her father, who had made her promise to take care of her little brother before leaving for the fight.

Twelve years had passed... and he'd grown up crooked! 

Well, his appearance was impeccable, but his personality…

Sigh, it's my fault. Back then, I was just a little girl myself, still full of childish whims. How could I have known how to raise a child?

Kurenai couldn't stand it anymore. 

She had to intervene with some family education.

But then, Natsuki started to float.

Not in the figurative, "walking on air" sense, but literally. He defied gravity, rising effortlessly several meters into the air.

When it came to causing trouble and attracting attention, Kurenai had to admit, her brother had always been a natural.

"Rejoice! As my teammates, you shall be under my protection, essentially possessing the ability to roam freely in this chaotic ninja world. Now, listen closely to my grand ambition!"

Natsuki spread his arms wide, striking a pose of divine bestowal.

"Natsuki Yuhi!!!!"

Ignoring the dumbfounded Kiba and the blushing, yet admiring Hinata...

"Blah blah blah blah blah blah blah blah. Eeek!!!!"

Kurenai snapped first. 

She frantically scratched her head, trying to suppress the goosebumps erupting all over her body.

"You still remember your name is Natsuki Yuhi?!" She roared, stomping her foot. 

Her eyes flashed crimson, and her physical strength amplified threefold.

BOOM!!!

Amidst a cloud of dust, she shot into the air, grabbing Natsuki and yanking him back down. The other two genin scrambled back in terror.

"Natsuki."

Back on solid ground, held tightly in his sister's embrace, Natsuki instantly deflated. A smirk played on Kurenai's lips. 

Her brother's weakness remained unchanged.

"S-Sis..." Natsuki struggled to lift his head from between her ample bosom. 

He saw his sister's eyes glowed red–who was not yet sure if she hadn't been hit by a genjutsu by some uchiha–a terrifying aura emanated from her.

"So you still remember I'm your sister? You're really cheeky, aren't you?"

Kurenai freed one hand.

Chop!

Using it to deliver a swift hand-chop on Natsuki's head.

"Ow! That hurt..."

Facing his super-powered sister, Natsuki's bravado vanished. 

He clutched his head, putting on a pitiful expression. 

He was going for the cute offensive, hoping to charm his way out of trouble. 

This tactic always worked wonders; 

His sister's anger would immediately melt and she would become the most tender and caring older sister.

'Kawaii!' As expected, Kurenai squealed internally, the red in her eyes starting to fade.

But in the next moment, it flared up again.

"Don't even think about getting away with it! It's my fault you turned out like this!

"Dimensional Lord, huh?"

Chop! 

"Ugh..."

"Eyes of Death, was it?"

Chop chop!

"Ugh...ugh..."

"Founder of the Dimensional End's Congregation, huh?"

Chop chop chop!

"Ugh...ugh...ugh..."

"Even if you were the Creator God, you're still my little brother! Begone, foul demon! Return my brother to normal..."

The hand-chops rained down.

Chop chop chop chop chop chop chop chop chop!

"Ugh...ugh...ugh...ugh...ugh... Waah..."

Seeing Natsuki crouched on the ground amidst the dust cloud, finally squeezing out a couple of tears, and Kurenai's anger dissipated.

She scooped Natsuki up, gently ruffling his hair.

"Sister was too busy before, amd didn't have the time to pay enough attention to you. But now...

"Now that I'm your Jonin instructor, I'll be watching you every minute of every day." Kurenai's voice was soft.

"Even when I'm pooping?" Natsuki asked, wide-eyed and innocent.

"Seems like I didn't hit you hard enough." Kurenai raised her hand again.

"I was wrong!" Natsuki quickly yelled.

"Hmph! Being a ninja isn't some childish game!" Kurenai set her brother down. 

Now that her anger had subsided, her superhuman strength faded. 

Suddenly, her brother felt heavier. He wasn't the little boy from years past anymore.

Still, boys generally matured slower, and Natsuki had always been delicate and cute. 

When he was floating in the air earlier, there was a hint of handsomeness she hadn't noticed before. 

He was becoming a young man.

Her opportunities to torment him were dwindling... Kurenai felt a pang of melancholy.

The dust settled, and Hinata and Kiba cautiously returned.

"Is Natsuki alright?" Hinata asked anxiously. 

Lady Kurenai had seemed angry. After she pulled Natsuki down, had there been a fight? 

The dust was too thick to see, and since they were all familiar faces, she hadn't activated her tenseigan.

"I'm fine," Natsuki reassured her, then whispered conspiratorially, "But let me tell you a secret. Older sisters are the scariest creatures in this world. A hundred times more terrifying than demons."

"Mm-hmm." Remembering his own sister Hana, Kiba nodded emphatically.

"Alright, Natsuki, what about your hobbies and dreams?" Kurenai had resumed her gentle, approachable smile.

"Well, I have many hobbies. Of course, my favorite is tasting my Sister's cooking." This earned him an approving nod from Kurenai.

"As for my dream... it is to protect dimensional peace and spread my Dimensional End's Congregation across countless dimensions."

At this, his sister's expression clouded over.

"Very well. Let's see if you have the strength to back up your big words.

"You have half an hour to prepare.

"Then we'll have a survival exercise. Anyone who fails will be stripped of their Genin rank and sent back to the Academy."

Kurenai produced three bells, shaking them so they jingled.

"Your mission is to take these bells from me.

"Any method is allowed. Ambushes, direct confrontation, traps... as long as you get the bells from me, you'll pass.

"Oh, and you better come at me with the intent to kill, because your teacher is a Jonin."

With that, Kurenai fastened the bells to her waist and walked into the forest, the jingling sound fading into the distance.

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