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mysicklove · 1 year ago

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Summary: four-year-old Yuuji didnt mean to bring up Mr. Gojos crush on you, which of course, leads to Sukuna's harsh teasing.

cw: fem! reader (reader gets referred to as girl, pretty, and mommy), curse words, suggestive language, lion king spoilers (lol)

wc: 1.8k

a/n: i love making sukuna an absolute menace. poor yuuji tho. i think i am going to introduce gojo as a character, because I think it would be entertaining to piss Sukuna off lol.

big brother au masterlist

“Su-kuna!”

“The fuck did you just call me?”

“Language,” You scold, not peering up from your book. Yuuji lays sprawled out on top of the both of you – his head in your lap, and practically purring in content when you gently pet the top of his head, while his little legs are on Sukuna’s thighs.

Yuuji giggles into your shirt, shaking his head mischeviously. “Bad word Su-kuna!”

In an instant, you feel the toddler being ripped away from your lap with a tiny screech. The noise startles you, and you perk up from your book to look to where the boy has gone to. But, you aren't surprised to see him dangling in the air by his ankle – Sukuna’s long fingers skillfully hold onto Yuujis chubby little leg tight enough to not drop him, but gently enough to not cause physical harm.

The boy doesn't seem to mind this position, being in it so frequently. Giggles and squeals leave the toddler's mouth as he stares at his now upside down brother. “You learning how to speak correctly?”

Yuuji nods his head, and his hands try to reach for Sukunas shirt. You rest your head on the man's shoulder, chuckling at the boy who was squirming in the air. “Uh-huh! F-Fush-i-guro taught me!” The dark haired toddlers last name was hard to pronounce, and it was amusing watching how Yuuji sounded it out.

Sukuna makes a loud groaning noise and you cover your mouth to hold back another laugh. “Of course you made friends with Gojo’s new brat. First he hits on my girl, and now his new kid is gonna manipulate this idiot.” He shakes Yuuji in the air to demonstrate his point, ignoring the squeals.

You roll your eyes with a laugh. “Just because Megumi taught Yuuji how to say your name correctly, doesn't mean the kid is manipulating him. Y’know Yuuji struggles with words sometimes.” You watch as the child in turn shakes his head in defiance, letting out a “Nu-uh!” that only makes you smile. You turn back over to your lover, kissing his cheek. “Aw, does it make you sad that our little Yuuji is growing up?”

“No,” he quickly rebuttals, “Brat isnt growing up fast enough. I am mad that you're not denying the fact that the white haired idiot is flirting with you.” You know that wasn't the full truth, but alas, Sukuna was extremely stubborn and would never admit that he didn't want his brother to grow up.

��Fush-i-guro says Mr. Gojo thinks you are pretty!” Yuuji announces, beaming at you from the air. You hold back a wince, smiling awkwardly back at the innocent words of the toddler. You watch as the boys cheeks begin to flush from all the blood rushing to his head, and immediately as if sensing it, Sukuna flips over the boy and instead places him on his lap, holding onto the back of his neck.

The action makes you smile, noticing the thumb that rubs gently at the pale skin. But when you glance at Sukuna, you notice quickly that he was anything but happy. Sukunas dark eyes twitches, flickering to you, and he speaks between his teeth. “Did he now? I may need to have a talk with Mr. Gojo next time I pick the little pest up. Does Fushiguro say anything else?”

“Sukuna,” you whine, realising that the hold on the boys neck was not out of affection – instead was used to trap the boy while he was questioned. “Y’know Gojo is alot. He just wants to–”

“Fush-i-guro says Mr. Gojo has a crush on Y/N!”

“Yuuji!”

“B-But, Y/N has a crush on brother,” the boy concludes, furrowing his eyebrows with a small nod. “Right, Ku–um–Su-kuna?” He turns up to his brother, doe eyed with his head slightly cocked to the side in question.

In response, Sukuna ruffles his hair, nearly sending the boy landing on his back. But, instead he giggles at the rough treatment, shutting his eyes and trying his best to stay upward. “The biggest crush. You make sure to tell the little brat that. Or else Mr. Gojo is going to try take her away.”

Your eyes widen and you push at his broad shoulders. “Sukuna! You're going to get him all worked up!” You exclaim, knowing the very sensitive (regarding you or Sukuna) child very well by now. You turn to the boy, whose own eyes widen as he trying to process the words. “Gojo is not trying to take me away.”

“He is going to take her away if you don't do anything, and little Megumi is going to have a new mommy.” Sukuna was grinning at the boy, as if his brother's fearful expression pleased him. You knew that he was being purposely dramatic – Gojo wasn't even technically Megumi's father, if there was a chance that you guys would ever get together (near zero) you would definitely not be the boy's new mom. But alas, Sukuna continues on with his words. “Thats why whenever you see the two of them talking you have to make sure you to scream as loud as possible.”

You cover the mans mouth before you he can spewl any more nonsense, but it was too late. Yuuji was already tearing himself from the man's lap and into yours – his lips begin to wobble and his eyes flood with tears. “Is-um-is that what you two talk about when I am with Mr. Nanami,” he warbles, thinking back to the multitude of times he has held onto his preschool teachers hand and watched you smile at the white haired man.

“No, love,” you reassure, turning your attention instead from scolding your lover to consoling the child. “Sukuna is being mean again. Don't listen to him. Mr. Gojo and I are friends.” You ignore the look that Sukuna shoots you, showing how displeased he is at the idea of you being friends with his least favorite person.

The boy sniffles, wiping his little fists on his face. “I-I dont want you to be Fush-i-guro’s mommy. You have to stay with me and Kuna! P-Please?” He doesn't even attempt to say his brother's name correctly, forgetting how he started the conversation all together. He was focused on trying not to cry, because his brother was sure to tease him, but it wasn't working out very well.

You kiss at his chubby cheeks, shaking your head with an exasperated look on your face, wondering how the hell you got to this conversation. “I am not, promise. I'm not going anywhere. Even if your brother is the worst, brattiest, malicious person alive, I have kinda grown attached to him. Besides, if I left who would I have movie nights with?”

“I am not a–” You shoot Sukuna a nasty glare, and he in return lets out an astonished laugh, but shrugs without care.

Your words make Yuuji perk up from your lap, and his eyes widen with glee. “You like movie nights too?” He was always begging for the three of you to watch movies together, but Sukuna always denies him considering it would end up being a cheesy Disney movie that Yuuji would fall asleep not even twenty minutes into.

“I love movie nights. Do you want to have one tonight?”

“Woah, woah, woah,” Sukuna butts in, and you spare him a glance. “Babe, we have plans tonight, remember?” He tilts his head to the side suggestively and you roll your eyes at him.

“Not anymore. Me and Yuuji are going to watch…”

“Human Earthworm 2!” The boy interjects, completely forgetting about his previous experiences with the movie, not good ones.

You poke at his cheeks, shaking your head. “I was thinking The Lion King.”

“Yes!”

“No,” Sukuna groans, covering his eyes with his palm.

You look at him with furrowed eyebrows. “No? Why are you putting your input in? You're not watching it with us.”

Sukuna, never have been told this before, looks appalled. “The fuck you mean?”

“Bad word!” Yuuji points to him in accusation, but Sukuna just ignores him.

You cock your head to the side, a sly grin pulling at your face. “You're not invited.”

“Why not?”

The two of you make eye contact for a long second, and after a moment or two, Sukuna sighs. “You're really mad about that?” You don't say anything, just continuing to stare at him. “Okay fuck–Yes that is a curse word, astute observation you brat. I am sorry for making the kid cry again.”

“And?”

Sukuna narrows his eyes at you, but you hold your ground. Then, he turns to the boy with a sigh. “Dont scream when you see Gojo and Y/N talk, alright?” He jabs his finger into the boys chest and Yuuji nods his head rapidly in understanding. But, a foxish grin pulls at the mans face and he says, “Instead…The moment you hear him talk to her, you bite his leg.”

He barks a laugh at the confused face of his brother, but when he looks up to you, the smile falters. “Okay, c’mon it was a jo–”

You point your finger to the door. “Couch.”

“You can't kick me out of my own room!”

You don't move your finger. Yuuji glances at you, cocks his head to the side, and then mimicks your action. “Couch!”

The three of you go silent for a long minute, and at this point the boy's hand begins to tremble from holding his hand out for too long. Eventually when Sukuna realizes that there was no point of reasoning, he lets out a dramatic sigh, before crawling out of bed.

When he notices your smug smile, he flips you off and you can't help but laugh at that. “I am coming back after the movie is done, ya hear?”

“If Yuuji does not fall asleep,” You tease in return, knowing the boy well, and Sukuna rolls his eyes.

His eyes flicker to the boy who was snuggling up to your chest, trying to find a comfortable position to watch the movie in. Sukuna chuckles to himself, opening up the door, before turning back to the kid one last time. “Hey brat,” he calls.

“Hm?”

“The father lion–Mufasa. He is my favorite character, so you'll bound to like him a lot. In fact, I sure do wonder if you'll get attached,” he muses, and your eyes widen when you realize what he is saying. Anything that is linked with Sukuna, Yuuji immediately falls in love with. This was bound to cause hysteria. “Enjoy the movie guys! Y/N have fun!” He calls, before shutting the door.

You pause for a moment, sighing into your hand. “Kuna likes the father lion? I want to see!”

You tried everything to avoid turning on the movie after that. But Yuuji, like his brother, was stubborn, and he desperately wanted to see the lion. He grew attached very quickly in that short period of time.

Deep laughs rumble through the house when Yuuji begins to sob over the animated lion's death. You lock the door, and Sukuna stays the night on the couch.

#mello.writes #big brother au #sukuna x reader #kid yuuji #sukuna x you #sukuna fluff #yuuji fluff #yuuji tadori fluff #jjk fluff #jjk x reader #reader insert #x reader #fem reader #female reader #f! reader #fem! reader

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