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The Itadori equation

Summary:

Yuuji Itadori's best friend is Megumi Fushiguro. He respect, admire and is protective of her. They are always seen around each other so much so that people would assume they are attached at the hips. Everyone knows this.

Sukuna "Kuna" Itadori has always has Megumi on his radar since he first met her. Not for any deep reason really, he just think she is pretty. Funny how that evolved into massive fat crush on Megumi. Everyone also know this.

And Megumi? She doesn't really care which Itadori is which... She just trying to secure that last name no matter what. Nobody knows this, surprisingly.

Notes:

Warning: Out of character behavior. Im a coward so in this AU, nothing bad happened to anyone, especially my sweet baby Yuuji!!!

I made Megumi a girl here but can be nonbianry also.

And the plot? Well, i made it up.

Enjoy!!!

Chapter Text

Everyone knew Megumi Fushiguro and Yuuji Itadori were best friends.

It been like that ever since the very first day Yuuji steps foot into Jujutsu Tech, following his older brother's footsteps to become a Jujutsu sorcerer.

The friendship between Yuuji and Megumi was the kind that didn’t need explaining—like Gojo Satoru being annoying on purpose, or Panda stealing snacks he definitely didn’t need. Megumi and Yuji moved like gravity had decided they were a matched set: training together, arguing together, getting scolded together (often by Kuna or Nobara)

“Those two are inseparable,” Maki said once, watching them spar.

“They share one brain cell,” Nobara shrugged as if it is a fact. “Megumi has it 90% of the time.”

Maki nodded.

Megumi didn’t deny any of it. Yuuji was loud, earnest, kind to a fault, and had a terrifying habit of throwing himself into danger with a grin. She trusted him with her life, her back in battle, and the knowledge of how she took her coffee.

Best friends. Everyone knew that.

Just like everyone knew that Sukuna “Kuna” Itadori was catastrophically, painfully, *obviously* in love with Megumi Fushiguro.

Kuna was four years older than Yuuji, taller, sharper around the edges, and carried himself like someone who had already seen too much of the jujutsu world's bullshit but still decided to stay just to see. He was powerful—*absurdly* so—having absorbed Sukuna’s fingers without losing himself, a feat that made the higher-ups sweat and Gojo grin like a proud menace.

And the moment Megumi entered the picture?

He was done.

“Don’t stare,” Yuuji whispered one day during training.

“I’m not staring,” Kuna muttered, eyes locked on Megumi as she adjusted her stance. “I’m… observing.”

“You’ve been observing her for three years.”

Gojo, lounging upside-down on a railing, chimed in cheerfully, “Aww, young love! Wait, does it still count if you're, what, twenty-two now?"

Gojo froze for a second, thinking real hard, "Still counts.”

Kuna flipped him off without looking.

Panda had a betting pool going.
Inumaki communicated exclusively in meaningful coughs and pointed looks.
Even Nanami, who pretended not to notice anything, once sighed and said, “Itadori, you are not subtle.”

Kuna knew. Everyone knew. He didn’t even bother denying it anymore.

Megumi, however, was a mystery.

She treated Yuuji the same way she always had—exasperated fondness, quiet loyalty, the kind of trust built from shared missions and late-night convenience store runs.

She treated Kuna… politely. Distant politely. Which drove him insane.

She didn’t flirt. She didn’t blush. She didn’t react when Gojo loudly said things like, “So Megumi, if you had to choose between the Itadori brothers—”

“Sensei,” Megumi said flatly, “I will punch you.”

What no one knew—*somehow*—was that Megumi Fushiguro had her own agenda.

It started as a joke in her own head.

The Zenin name is arguably shit, buried under sexism, classism and bad blood that Megumi never imagined that it could be such an issue. Fushiguro wasn’t happy memories to her either, dead parents and all that...

So one night, after a mission, while watching Yuji and Kuna argue over whose turn it was to do the dishes, Megumi had a thought:

*Itadori… is a solid last name.*

Not necessarily cause she cares about the reputation it came with. It's just so...conveniently available and familiar. Warm

She didn’t care which Itadori it was attached to.

Yuji was her best friend—reliable, warm, someone she could build a life with easily.
Kuna was powerful, composed, someone who could protect and provide stability in a world that ate sorcerers alive.

Either worked.

Yuuji and his instinctively action to moved and shield her in fights, how he laughed too loud at her dry comments like they were the funniest thing he’d ever heard. He made her feel chosen.

Kuna and his calming demeanor, always positioning himself just slightly closer to her than necessary, how his eyes tracked her injuries before she even acknowledged them. He made her feel protected.

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One afternoon, while the three of them were walking back from a mission, Megumi spoke casually.

“Hey, Yuuji.”

“Yeah?”

“If I married someone, would you still train with me every morning?”

Yuuji blinked. “Uh. Yeah? Why wouldn’t I?”

Kuna nearly tripped over a crack in the pavement.

Later, she turned to Kuna while handing him a water bottle.

“You don’t mind the idea of settling down, do you?”

He stared at her like she’d just hit him with a Domain Expansion. “I—no. I mean. Not if it’s— I mean—”

She nodded thoughtfully. “Good to know.”

By the time Gojo realized something was off, it was already too late.

“Wait,” he said slowly, watching Megumi walk ahead with a faint, unreadable smile, “Am I missing something here?"

Nobara snorted. “Because you are.”

 

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In the end, Megumi has already decided

She choose Itadori.

Whether it was Yuuji Itadori or Sukuna “Kuna” Itadori…

She was going to secure that last name.