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Sukuna had no words to describe what he was looking at. Sitting by his feet is a small child, with large puffy cheeks, big round golden brown eyes, and short fluffy (h/c) hair, looking about ready to cry. "Oh shit don't cry," Sukuna said as he tried to keep the kid calm. What was happening? Why does this kid look familiar? Oh god someone stole DNA from him and gave him a baby!

"A-Are you... Are you mad at me?" The child sniffled as he wiped his face with his sleeve. Why would Sukuna be mad? All he did was go into a chemistry room looking for (Y/n) and only found a fucking child! ...No fucking way. "Kid, what's your name?" Sukuna asked as he picked the child up and kept him at arm's length.

"(Y-Y/n)..." The child responded with a small hiccup. "What's your name, Mr?" He asked curiously, clearly never hearing the term stranger danger. Sukuna has no idea what to say, much less tell a child what's going on. "Well (Y/n), my name is Sukuna and I'm... Your older brother," he mutters, trying to let the information sink in.

(Y/n) tilted his head to the side, confused. "You have the same name as my brother! We're twins," (Y/n) informed happily. Sukuna pulls (Y/n) closer once (Y/n) looks happy and more trusting of Sukuna. "Oh that's great, um shit okay um," Sukuna trails off as he looks around the classroom. He pressed (Y/n) against his side with one arm as he tried to figure out what happened.

"Big brother? Where are we?" (Y/n) asked as he looked around, gripping onto Sukuna's shirt so he wouldn't get separated. "We... Are at my school, I wanted to show off that I have a cool little brother," Sukuna said as he looked at notes left by other students. One of the notes had the title "De-aging" and an empty glass bottle next to it.

"That means I get to meet your friends? Is my twin here too?" (Y/n) asked curiously, excited to go explore. "Oh um your twin is arriving just a little bit late, don't worry your big brother will keep you safe," Sukuna reassures (Y/n). He wondered what Megumi would think of this situation. "Okay! Maybe you can meet him! But, he doesn't like people much," (Y/n) said, pouting. 'You got that right,' Sukuna thought, trying to figure out if there's a cure. But he's not a chemistry person.

(Y/n) started to get bored so he wiggled out of Sukuna's grip and ran towards the door. "Woooaaah!! This school is so big!!" (Y/n) exclaimed in awe as he entered the hallway. "(Y/n)!!!" Sukuna yelled as he ran after him. "Awh! Where's your parent little kid?" A girl asked as (Y/n) caught the attention of other students. So many students surrounded (Y/n), that he was starting to get overwhelmed.

(Y/n) tried to back away from the girl only to nearly run into someone else. There were so many people. His breathing got harsher as he felt like the walls were closing in on him, and tears threatened to fall from his eyes as he tried to stay strong. But, (Y/n) couldn't hold back the loud sob, which quickly turned into hysterical crying.

The crying didn't last long as someone picked him up and tucked him securely to their chest. "Oi, back the fuck off! Unless you want your ankles broken!" Sukuna shouted at the students. Instantly the crowd backed away, not wanting to test Sukuna's patience. But, some of the girls couldn't help but swoon over how protective Sukuna is towards the child.

(Y/n) gripped Sukuna's shirt, muffling his sobs in the fabric as he tried to calm himself down. "I have you. You're okay," Sukuna reassures (Y/n) as he ruffled his hair and walked away from the crowd. "Wow, who knew you'd stand up for a strange child," a familiar voice said. When Sukuna turned towards the voice, he spotted Hikaru with the club arriving behind him.

"Is it me or does that child look like you?" Karou asked as he leaned down to get a better look at (Y/n). "You had a child?!" Tamaki exclaimed with a look of horror. "Shut up dumbass, I have a boyfriend remember," Sukuna huffed at him. "Do you think I got him pregnant or something?"

"Boss would believe something like that," Hikaru said, snickering. "Shut up! Why does the child look like you then?" Tamaki asked. (Y/n) peeked out from the fabric, curious to see who was talking to Sukuna. But, what caught his attention was the other "child" in this school. Honey brightened and smiled at (Y/n), giving him a cute wave. (Y/n) shyly waved back, unsure of the "child".

"It's (Y/n), he drank something called De-aging from the chemistry lab," Sukuna huffed, annoyed as he ran his fingers through (Y/n)'s hair. "So that's where that went..." Kyoya muttered, looking away from Sukuna. "AHH!!" (Y/n) suddenly screamed as Karou tried prying him off of Sukuna. "Come on! Let me hold you!" Karou demanded as he struggled to detach (Y/n). Instantly Sukuna's fist slams hard against Karou's temple.

"Ow!!" Karou cried as he let go of (Y/n) to clutch his aching head. (Y/n) instantly wrapped his hands around Sukuna to the best of his abilities. Clinging onto him as if his life depended on it. "Karou!" Hikaru yells as he tends to his twin. "You brute, why did you do that?!" Sukuna glares at Hikaru as he comforts (Y/n). "Your twin cannot possibly think a kid likes to be yanked. Ever heard of stranger danger? He scared him!"

"I am not a stranger nor a danger! I just wanted to hold him!" Karou argued, glaring back at Sukuna. "He's so cute! He's like a Koala! Let me hold him!" Tamaki said as he made grabby hands towards (Y/n). (Y/n) looks horrified at Tamaki's weirdness and starts sobbing and clutching onto Sukuna. "Wha- Why is he crying?!" Tamaki asked, in disbelief. Sukuna ignores Tamaki as he soothes (Y/n). "It's okay (Y/n), big brother won't let that disgusting pervert hurt you," Sukuna reassures as he hugs him.

"I am not a pervert! I am a nice, gentle being!" Tamaki exclaimed, offended. "Hey (N/n)-Chan, do you want any cake?" Honey asked innocently as he presented a slice of cake. (Y/n) peeked over at Honey, looking at the cake curiously. "No, the kid doesn't need any cake," Sukuna immediately turns down the cake. "He'll be bouncing off the walls with a sugar rush and I'll have to deal with it."

Too late, (Y/n) already grabbed a handful of cake and shoved it into his mouth. Everyone went silent as they stared at (Y/n) with wide eyes. All Sukuna could do was inhale and exhale as he was preparing himself for a hyper child. Almost instantly, (Y/n)'s pupils dilated and he scrambled out of Sukuna's hold.

"HiI'm(Y/n)areyouSukuna'sfriend's?!Oh!Doyouwanttoplaywithme?Doyougotoschoolheretoo?" (Y/n) bombarded the group with questions as he ran around at rapid speed. Sukuna waited until (Y/n) got close to him before grabbing him at the right moment. "Shit, shit what do I do with a hyper child?" Sukuna asked. Then he got an idea. He puts (Y/n) back down and lets (Y/n) run around.

"Why did you do that?!" Hikaru questioned as (Y/n) ran around like a speedster. "Letting him tire himself out," Sukuna answers as he keeps an eye on (Y/n). The child climbed up Mori, fell on top of Haruhi, and tried pulling at Karou's hair. "Ow! Ow! Ow!" Karou exclaimed as he tried to get the child off of him. "Hehehe! Wee!!" (Y/n) giggled as he let go and ran through their legs and around the group, nearly tripping most of them.

Sukuna grabbed (Y/n) again and chuckled as he looked down at (Y/n). "Causing chaos around the club, I salute you," he said proudly as he gave (Y/n) a little salute. Confused, (Y/n) saluted back with a lopsided grin, unsure what it really meant. But, he quickly wiggled out and ran around again, with Honey joining him this time.

Until (Y/n) tackled him to the floor and started roughhousing with him. Even though Honey is a world-known martial artist, he finds himself struggling to get out of (Y/n)'s grip. "Shit," Sukuna hissed as he quickly rushed to (Y/n). The last thing he needs is (Y/n) breaking someone's bones because he has no idea how strong he really is. "Oi, that's not right, stop it,' Sukuna scolds (Y/n) as he takes him off of Honey.

"But why not? My brother and I do it all the time!" (Y/n) argued as he wiggled around in Sukuna's hold. Making it hard to hold onto him and keep him still, while Honey quickly rushed to Mori for comfort. "You have too much strength for the average kid, you're hurting Honey," Sukuna tells him with a glare. Sukuna made sure to use a bit more of his strength to keep (Y/n) in place.

"Why did he stop (Y/n) from hurting Honey and not us?" Hikaru asked, deadpanning. "Honey wasn't even hurt, just overwhelmed," Karou grumbled, unhappily. "I was hurting Honey?" (Y/n) asked as he stopped willing, now looking worried. "You almost did, you just need to be careful," Sukuna tells him. "You're a strong little guy, alright?" Sukuna puts (Y/n) down.

Slowly, (Y/n) walked up to Honey with a guilty look. "I'm sorry... For hurting you," (Y/n) said softly as he looked at the ground. "Awh!! You're forgiven!" Tamaki cooed as he picked (Y/n) up and swung him around, squishing his cheek against (Y/n)'s squishy ones. "Tamaki, I think you should put him down," Haruhi warned as she stepped away from him. "Huh? Why?" Tamaki asked, unaware of the dark glare resonating from behind him.

(Y/n), still freaked out by Tamaki, starts bawling his eyes out. (Y/n) disappears from Tamaki's arms and a punch collides into his jaw. It felt like everything was in slow motion, the club members were certain they heard multiple bones breaking. Tamaki sprawled out on the floor, smoke literally coming off of him, while (Y/n) held onto Sukuna for dear life.

Sukuna glares at the deflated Tamaki as he rocks (Y/n) in his arms. "Quit touching him, you disgusting parasite," Sukuna hissed. "Brother, he's scary," (Y/n) sniffled as he glanced back at Tamaki in slight fear. "Don't worry, I'll keep you safe," Sukuna reassures him. "How come you didn't punch Honey when he touched (Y/n)?" Karou asked with an accusing look.

Sukuna sends him the "Are you kidding me?" look. "Have you all never been around children?" Sukuna asked them. "No, but I know you have favorites," Karou grumbled, crossing his arms. "Oh! Oh! Would you punch Haruhi if she touched (Y/n)?" Hikaru asked curiously. "I don't hit women unless they come at me with a knife," Sukuna answers as he coddles (Y/n).

"So, if I was a woman, you wouldn't hit me?" Karou summarized, looking confused. "Sounds sexiest," Hikaru argued with a shake of his head. "Can I hold him?" Haruhi asked curiously but made no attempts to grab (Y/n). "Knowing the both of you now, I would still punch the hell out of you if you were women," Sukuna tells them with such certainty. He then glances at Haruhi and then at (Y/n).

"Would it be okay if he held you?" He asked (Y/n), wanting his permission in this too. (Y/n) looked at Haruhi intensely, looking unsure. "She's a girl?" (Y/n) asked innocently, a bit confused by Haruhi's gender. "Not here!" Karou hissed warningly, reminding them that they were still in the hallway filled with students. At this, Sukuna punched Karou with an uppercut this time. Who the hell yells at a child who completely forgot about the whole Haruhi thing?!

"Ow! What the hell was that for?!" Karou complained as he held his chin. Sukuna just walked off, stepping over Tamaki's body, and grabbed Haruhi's wrist. He knows (Y/n) would like to be held by her. "No (Y/n), Haruhi just has some feminine features," he lied to (Y/n). "Guys can look like girls?" (Y/n) asked, looking more confused. "Yeah it's a thing, anyways," he said, now stopping in a more quiet spot in the hall. "Want to be held by him now?" (Y/n) looked at Haruhi again and reached out with grabby hands.

"Yes, please!" (Y/n) said cutely, causing Haruhi to melt slightly from the cuteness. Sukuna hands (Y/n) to Haruhi, and (Y/n) immediately hugs her tightly with his tiny arms around her neck. "He's so cute, did you look like this too when you were young?" Haruhi asked as she looked at Sukuna curiously. Sukuna leans against the wall, crossing his arms against his chest. "I did, we are twins after all," he said as he watched (Y/n). "Hm, seeing him like this makes me wish I was a kid again."

"Really? You're not as happy as you are now?" Haruhi asked as (Y/n) climbed on her, too energetic to just sit still. "That's not what I'm saying," he said as he reached out to take (Y/n) from her. He successfully caught (Y/n) when he fell off. "It just reminds me of the simpler times." He lets (Y/n) climb on him now.

"I feel that, how did this even happen anyway?" Haruh asked as she watched (Y/n) literally hang off of Sukuna's arm. Sukuna once again catches (Y/n) and lets him climb onto Sukuna's shoulders. It was a rinse and repeat and Sukuna is starting to wonder if (Y/n) was doing it on purpose.

"He drank something from the chemistry lab," Sukuna tells Haruhi as (Y/n) giggles. "Wee!!" (Y/n) exclaimed as he wrapped his legs around Sukuna's throat and hung upside down like a bat. Sukuna feels his brow twitch and catches (Y/n) again. Yep, he's doing this whole catching thing on purpose. "You try that again (Y/n) and I will drop you," Sukuna threatens, but he doesn't mean it.

"But it's fun!" (Y/n) argued, pouting cutely. Sukuna sighed and put (Y/n) on his shoulders again. "Even as a brat, he has me wrapped around his finger," Sukuna mutters to Haruhi. "I can see that," Haruhi chuckled, finding it amusing. (Y/n) happily played with Sukuna's hair, yanking it occasionally. "Ow," Sukuna grumbles every time (Y/n) pulls his hair. "I hope whatever he drank doesn't have a permanent effect."

"Didn't Kyoya say something about wondering where the drink went? Maybe he has an idea on how to fix what happened," Haruhi suggested. Sukuna still despises Kyoya, but he wants (Y/n) to be normal. He has dealt with this kid for an hour and he's already drained. "Is this what fatherhood feels like?" Sukuna sighed heavily. "At least you know what having a kid is like, saves you time actually having one," Haruhi said, sounding amused.

"But I thought you were my big brother? Are you actually my dad? You look like my dad! But dad doesn't have weird sharpey marks," (Y/n) said as he poked at Sukuna's tattooed face. Sukuna scrunched his face when (Y/n) poked him and grumbled. "Let's just get to Kyoya, I don't know how long I can handle this," Sukuna sighed.

~~~

"So you want me to fix something your brother got himself into?" Kyoya asked as he sat on a swivel chair like he was making a deal with someone. "You see this," Sukuna said, holding out (Y/n). "Hi!!" (Y/n) said as he waved excitedly at Kyoya. "He's a 15-year-old in a toddler's body, I want him fixed," Sukuna demanded. "What's in it for me?" Kyoya asked with a smirk.

"I mean, you did take my chemical experiment with that as a repercussion. Now I have to make a new one for my project. On top of the fact I have to make you an antidote, now to me, I find unfair," he argued with Sukuna. "You know what's also unfair?" Sukuna asked, glaring at him. "Ending up in the hospital with 50 broken bones." Before Sukuna can make his threat a reality (Y/n) once again almost falls off of him and he quickly catches him. Sukuna pinches the bridge of his nose, annoyed.

"What the hell do you want Kyoya?" Sukuna asked in a demanding tone. "I want a lot of things, maybe give me something interesting and I'll think about it," Kyoya offered with a sly smirk. Sukuna scowls at Kyoya before storming off. No, hell no. He knows what Kyoya really wants and that's for them to rejoin the club. He's a smart guy, he can figure out the antidote himself.

When he entered the chemistry room, he placed (Y/n) down with a stern glare. (Y/n) looked up at Sukuna confused. "Stay still while I figure this out," Sukuna told (Y/n) sternly, knowing it would only go through one ear and out the other. So Sukuna did the only thing he could to make sure (Y/n) stayed in the room with him. He locked the door and (Y/n) was too short to reach the knob. Sukuna gathers the items and equipment he needs and starts experimenting.

As he clambered through the chemical, (Y/n) looked around the chemistry lab. "Wooahh," (Y/n) awed as he stared into a funky tube. He sniffed the contents inside it and scrunched his nose in disgust. "Don't sniff random objects," Sukuna tells (Y/n) as he takes the tube away. He tried mixing two contents together and that created a small explosion in his face. Sukuna frowns at the failed project and starts again.

"What are you doing? Can I help?" (Y/n) asked curiously, getting on his tippytoes to see what Sukuna was doing. "Sorry (Y/n), but this stuff is dangerous," Sukuna says as he reaches down to ruffle his hair. Just as he said that he stopped. Even if he made it successfully, does he really want to risk (Y/n)'s health like that?

"Dangerous? Is that why you needed that guy's help?" (Y/n) asked as he looked up at Sukuna cutely. Sukuna takes a deep breath and then sighs as he puts the tube down. He instead sits down on the floor and sits (Y/n) in his lap. "Yeah, you could say I needed his help," he tells (Y/n) as he leans into his hand.

"Then why is he not helping? Is he bullying you? I can beat him up if he is!" (Y/n) proclaimed as he held his fist out like he was punching something. Sukuna chuckles as he sees the "punch" and lightly flicks (Y/n) forehead. "Thanks, (Y/n), but you don't need to beat someone up for me. That's my job as your older brother, to beat up your bullies."

"Owwie, why'd you flick me?" (Y/n) asked, pouting slightly as he rubbed his forehead. "Because you are an idiot" Sukuna snickered, earning a pout from (Y/n). "Why do you want to make something dangerous?" (Y/n) asked as he looked at the tube again. Sukuna looks up at the tube and doesn't answer him. Instead, he looks down at (Y/n) and gives him a small smile. "(Y/n), you know I would do anything for you right?" Sukuna asked him.

"I think so! Even though I just met you..." (Y/n) muttered, looking unsure. "But I trust you, Big Brother!" He said without any doubt. Sukuna smiles then lets out a sigh. Tomorrow he'll need to go back to Kyoya and offer the most heinous deal he will ever do. But tomorrow, he will need the last few hours of freedom he has. "Let's go home (Y/n), we'll come back here tomorrow," Sukuna said as he put (Y/n) on his shoulders.

By the time he took (Y/n) home, he was surprised by Megumi in their kitchen. Megumi was sitting at the kitchen island with some textbooks in front of him. "Blessing?" Sukuna calls out, surprised as he walks over to his boyfriend's side. Megumi looked up and smiled at his boyfriend, but he froze when he saw the child on Sukuna's shoulders. "I came to visit, but why do you have a child?" Megumi's eyes narrow as he looks at Sukuna.

"Did you cheat on me?" He accuses Sukuna. Sukuna looks taken aback by the accusation and takes (Y/n) off of his shoulders. "What? No, I would never, and plus he's a toddler which means I would have become a father when I was like 11," Sukuna explains, but offended. "So you were cheating on me for 4 years?" Megumi asked with a raised brow. Sukuna facepalms as (Y/n) runs around.

"It's (Y/n)," Sukuna tells him. "He drank some chemical, which I'm sure could be used as chemical warfare, so now he's a kid." Megumi blinked in disbelief and slowly looked at (Y/n) who ran around like a maniac. "Why does your school have chemicals that can literally change a human's age?" Megumi asked in disbelief. "Kyoya," Sukuna grumbles out as he quickly catches (Y/n) again in his mid-sprint.

"Oh... That makes a lot more sense. So how does he turn back?" Megumi asked as he poked (Y/n)'s cheek. "Hey! Quit it! Don't poke me!" (Y/n) whined as he tried squirming away from Megumi. "Kyoya wants something in exchange for the antidote," Sukuna said, sighing. "Which means I have to rejoin the club with (Y/n)."

"Is rejoining the club so bad you're reluctant to turn (Y/n) back to normal?" Megumi asked, actually surprised. Sukuna sits (Y/n) in a chair Sukuna scowls, instantly (Y/n) jumps off the chair and runs off again. Sukuna sighs in defeat and plops down in the chair. "The club nearly fucked up my life. I almost lost you, (Y/n), and now I'm going back there? What else will happen?"

"I see your point... Well let's think rationally, do you want to deal with a child alone? You need to think of the consequences that could happen to (Y/n) as he stays this age," Megumi said as he sat on Sukuna's lap. Sukuna wraps his arm around Megumi's waist and pulls him close. "Of course I know that and I would be taking away the years (Y/n) experienced," he mutters as he buries his face into Megumi's shoulder.

"Not only that, you won't have a twin brother, you'd have a young brother that needs parental care. You're not even close to ready to be a parent," Megumi said as he nuzzled Sukuna's hair. Sukuna nods and looks up to his blessing. "I have a feeling I am growing gray hair already," Sukuna said, jokingly. "You better not, or I'll pluck it out myself," Megumi said as he threatened to yank a strand of hair off of Sukuna's head.

Before Sukuna could say anything he heard something crash in the next room. Megumi hopped off Sukuna's lap and the two went to check out what the sound was. Sukuna was worried (Y/n) broke something and injured himself, but to their surprise, (Y/n) was passed out on the floor. Well, it looks like he tired himself out. Sukuna walks over and picks up (Y/n) from the ground and then carries him to his room.

"How long has he been running around like that anyways?" Megumi asked as he followed Sukuna to (Y/n)'s room. "Let's see...maybe four hours now?" Sukuna said, unsure. Sukuna enters (Y/n)'s room and then lays him down, but (Y/n) won't let go of Sukuna's shirt. "Looks like you're stuck with him for tonight," Megumi snickered, finding it slightly cute. Sukuna lightly glared at him then smirked getting an idea.

Sukuna grabs Megumi's wrist and the next thing Megumi knows, all three of them are in bed. "Now you're stuck with us for tonight," Sukuna said, smugly. (Y/n) was sprawled out in a starfish behind Sukuna. "You know, when I say let's have sleepovers, this is not what I had in mind," Megumi grumbled, annoyed. "At least you don't have a foot in your back right now," Sukuna said as he cuddled Megumi.

~~~

Sukuna woke up, expecting to have his face in Megumi's soft hair. Except he sees (Y/n)'s ass right in his face. He groans in disgust and turns away just as Megumi wakes up as well. He's not in a better situation, Megumi expected to wake up in Sukuna's chest. But no, Megumi woke up to a (Y/n) toddler drooling in his hair.

"You really need to fix this, like today," Megumi said as he moved (Y/n) off of him. "I will," Sukuna muttered as he sat up. (Y/n) clings to Megumi's side and mumbles in his sleep. "Get off, go, shoo," Megumi whispered as he tried getting (Y/n) off of him as delicately as possible. Sukuna helps remove (Y/n) from Megumi's side, but now (Y/n) latched onto Sukuna. Sukuna sighs in defeat and carries (Y/n) out.

"Well, good luck trying to convince Kyoya to turn him back, I'm heading home," Megumi said as he stood up. "Hopefully the next time you see me (Y/n) will be normal again," Sukuna said, as Megumi walked up to them. He kisses Megumi and they hear a small gasp from (Y/n). "Ew, kisses give you cooties!" (Y/n) said, now wide awake. "Cooties make you sick, protect yourselves!"

(Y/n) gets free from Sukuna's arms and then runs off through the house, now Sukuna needs to go find him. "Oh for the love of-," Sukuna growled, facepalming. "And off he goes, good luck with that," Megumi said as he pats Sukuna's back before heading out. Sukuna groans and then moves to find (Y/n). "(Y/n)! Come on, I don't have cooties!" Sukuna calls out as he looks for his twin.

"Yes, you do! You're infected with them!" (Y/n) yelled, oblivious that he had given away his hiding spot from under the couch. Sukuna shakes his head and lifts the couch up with one hand. "I don't have cooties, if I did I would be sick wouldn't I?" Sukuna asked, raising his brow. (Y/n) was too fascinated by Sukuna's strength to care about what Sukuna just said.

"Woooahh! You're lifting a couch! That's so cool!!" (Y/n) exclaimed in awe. Sukuna smirked and motioned (Y/n) to move from his spot. "Come on, I have to get to school soon and you're coming with me," he tells his little brother. "Awh but why? I want to stay here! Where's mom and dad anyways?" (Y/n) asked as he looked around curiously. "Uh, they'll pick us up from school later, they had to leave for work early," Sukua said, setting the couch down as soon as (Y/n) moved.

"But why do I have to go to school? Can't we do something more fun?" (Y/n) asked as Sukuna picked him up. Damn, children ask too many questions. "How about this, you come to school with me and if you behave I will give you an ice cream sundae," Sukuna offers (Y/n). "Really? Pinky promise?" (Y/n) asked excitedly as he held out his pinky. Sukuna wraps his pinky around (Y/n)'s. "Pinky promise," Sukuna said, smiling.

~~~

Sukuna walked with purpose as he headed to the room Kyoya was most likely in. (Y/n) was held in his arms, as he silently clung to Sukuna's shoulder. Sukuna scowls at Kyoya, who has a smug grin. "I have one offer for you Kyoya, if you want something else you'll need to tell me," Sukuna said, glaring at him.

"Do tell," Kyoya said as he crossed his legs, waiting. "I will rejoin the club," Sukuna offers, purposely leaving (Y/n) out to see if Kyoya won't notice the loophole. But he was wrong. "Only you? I don't know, I might need more convincing," Kyoya said as he rested his chin on his hand. Sukuna starts cursing in Korean under his breath. "(Y/n) will join the club too," he mutters, unhappily.

"I am? What club?" (Y/n) asked curiously, not knowing what they were talking about. "The pizza club," Sukuna lies with ease. "Pizza?! Can I have pizza?!!" (Y/n) asked excitedly, really wanting pizza. "When we get into the club, I'll buy you all the pizza you want," Sukuna promises. (Y/n) cheered happily, as Kyoya chuckled slightly.

"Sorry, but you both joining the club is not enough," Kyoya said with a smirk. "You're pushing my buttons you rich brat, get it over with," Sukuna hissed. "That Gojo friend of yours, tell him to back off. He's been constantly on my back since you placed him on me," Kyoya said as he adjusted his glasses. Sukuna couldn't help but smirk. "Not fun getting a taste of your own treatment is it?" Sukuna asked, mocking him.

"But alright, I'll call off my attack dog, but if anything happens to (Y/n) it's not him you'll have to worry about," Sukuna threatens as he glares at Kyoya. "Careful, I'm the only person who knows how to turn him back. Don't tempt me into turning him into something else," Kyoya warned. At that moment Kyoya put multiple targets on himself, but Sukuna will back down for now. "Turn him back now," Sukuna mutters, unhappy.

"Not until you sign this agreement I printed out," Kyoya said as he took out a paper and hand it over to Sukuna. He read over the paper slowly, making sure he wasn't being fucked over. But as he read, he realized it had everything they just discussed, indicating Kyoya was prepared for this. "You asshole," Sukuna grumbled as he reluctantly signed the paper. "Now, as per agreement, turn him back," he demanded Kyoya.

"Oh, that, (Y/n) will turn back to himself in an hour. I never said the experiment was permanent," Kyoya said with a smirk. Sukuna gives him a mocking smile and pulls out his phone as he walks out. "Excuse me I need to call off my attack dog," Sukuna said as he walked out. But despite his somewhat carefree moment, Sukuna is furious. But he won't let Kyoya get any more upper hands on him and his twin.

He calls Gojo as he makes his way to the cafeteria. "Brother? Am I going to die?" (Y/n) asked worriedly. "No (Y/n) you're not," Sukuna reassures him. "In fact, you have a tiny germ in your body but the only cure is to eat that ice cream sundae I promised you along with pizza."

"A germ?! I knew it! You gave me cooties!!" (Y/n) whined as he started to struggle in Sukuna's grip. "Aw, so you don't want the pizza and sundae? Well looks like I need to eat them then . Oh well, more pizza for me," Sukuna said playfully. (Y/n) stops struggling and looks at Sukuna with wide eyes. "I want pizza and sundae," (Y/n) said, looking ready to cry again. Sukuna's eyes widen and practically sprinted to the cafeteria.

Now (Y/n) has his pizza and sundae, and Sukuna is just worn out. It's a lot of work to take care of a kid. (Y/n) happily ate pizza and the sundae, flowers practically sprouting out of him and spinning in the air. "You're seriously a sucker for kids, huh?" Haruhi said as she entered the cafeteria. "What are you talking about?" Sukuna asked her, raising a brow.

"I saw you running from the hall. It looked like you were in danger, only to get pizza and a sundae," Haruhi said as she pointed at the food. Sukuna huffs as he leans back in his seat and (Y/n) eats away. "You try dealing with a crying toddler, it's not fun," he said, ruffling (Y/n)'s hair. "So, did Kyoya figure out an antidote?" Haruhi asked curiously. "There is no antidote," Sukuna growls under his breath. "He knew (Y/n) would return to normal after a certain amount of time and now we're back in the club."

"Can't you just, you know, go against the deal? It's not like you're in a binding vow that'll kill you if you don't do it," Haruhi said, a bit surprised Sukuna was going along with the deal. "Yeah well shit head threatened to change (Y/n) into other stuff instead of a toddler, so right now my hands are tied," Sukuna explains, unhappily.

"Stuff like what?" Haruhi asked, looking a bit horrified that Kyoya would do that. "I don't know, but I'm not risking it," Sukuna said, frowning. He then turns to (Y/n) and pats his head. "(Y/n), are you getting full yet? If you eat too much you'll get sick later" he warned his brother. (Y/n) shook his head as his face was covered in ice cream. Sukuna takes a napkin and wipes (Y/n)'s face clean. Maybe it was because it was (Y/n), but this almost feels second nature to Sukuna.

"You're a mess brat," Sukuna lightly said as he wiped (Y/n)'s hands clean too. "Why do you call him a brat?" Haruhi asked curiously. Sukuna just shrugged his shoulders and once (Y/n) was clean he debated if he should go ahead and take the ice cream and pizza away. What will happen if (Y/n) crashes from the high amount of sugar intake?

"Hey, is it me, or does (Y/n) look a little bigger than earlier?" Haruhi asked, noting the odd change. Sukuna quickly looks over to his twin and sure enough, (Y/n) looks...bigger. (Y/n) looks back up at him with dotted eyes, looking confused. Then he grew bigger again. "Oh shit," Sukuna hissed as he grabbed (Y/n) and runs out of the cafeteria.

"Big brother? Where are we going?" (Y/n) asked as he clung to Sukuna. Sukuna didn't like the idea of (Y/n) growing in front of others. What if (Y/n)'s clothes don't grow with him?! He can't risk that! "Uh, we're going to uh, dammit," Sukuna mutters as he rushed to the boy's bathroom. (Y/n) sat on the toilet confused as he watched his brother pace back and forth anxiously. Sukuna locks the bathroom and wants to strangle the life out of Kyoya.

"Brother, how are you feeling?" Sukuna asked (Y/n), concerned. "I feel fine? Why are we in the bathroom?" (Y/n) asked, still confused, and his voice sounded like it was cracking. "Just needed to check on something," Sukuna said as he leaned against the wall. There was pounding on the door, coming from angry students. "Someone took a huge shit in here, bathroom is unavailable!" Sukuna yells.

"They did?! Ew!" (Y/n) complained as he gripped his nose in disgust. "Great, is your nose broken? That was an obvious lie (Y/n)," Sukuna said, unimpressed. When he turned to look at (Y/n), he noticed he had grown a lot. (Y/n) was practically touching his chest now. And thank god his clothes are growing with him. "I see you're growing again, thank god because I don't know how to handle a kid," Sukuna sighed in relief.

"Excuse me?! Are you saying you don't want me around?!" (Y/n) asked as he pouted, now up to Sukuna's shoulders. "Waking up with your ass in my face is not something I want to keep doing," Sukuna retorts. "I did not do that!" (Y/n) exclaimed, as his face heats up in embarrassment. "So you remember everything you did yesterday?" Sukuna asked, smirking.

"Shut up and open the damn bathroom," (Y/n) grumbled, crossing his arms, as he finally got back to his normal height. "You're not a toddler anymore (Y/n), you can reach the doorknob," Sukuna said, teasing him. "Well, if your fat ass wasn't blocking me, I would be able to open the door!" (Y/n) argued as he tried to shove past Sukuna, but the small space didn't allow him to do that. "I raise you and this is how you treat me?" Sukuna acted as he moved from the door. "What an ungrateful brat you are."

"Shut up!" (Y/n) shouted as he opened the bathroom door, storming past the few people who hurriedly entered the bathroom in order to get to the toilets. Sukuna lets out a sigh as he exits the bathroom as well. But this time instead of following after (Y/n), he sits on a bench and leans against it, closing his eyes. He'll rest his eyes for a few minutes before he has to get up and deal with the shitstorm Kyoya put him in.