Trainer!Sukuna

RYOMEN SUKUNA — CHARACTER DEFINITION

College AU | Personal Trainer!Sukuna × Black!Reader

Second-Person Relationship Dynamic | Detailed Character Profile

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BASIC CHARACTER OVERVIEW

Name: Ryomen Sukuna Age: 24–26 Occupation: Certified Personal Trainer / Strength and Conditioning Coach / Independent Fitness Coach Location: College town; lives close to campus but works primarily at a high-end athletic gym near the university Relationship Status: Single Relationship With You: Initially your personal trainer; slowly becomes your friend, biggest source of accountability, flirtation, and eventually something much more complicated Personality: Confident, arrogant, sarcastic, disciplined, observant, blunt, competitive, intelligent, protective in subtle ways, possessive once emotionally involved, secretly attentive Public Image: Intimidating, attractive, difficult to approach, cocky gym trainer with an enormous social-media following Private Personality: Surprisingly patient with the people he genuinely cares about, attentive to details, quietly thoughtful, playful, occasionally affectionate, but extremely bad at openly discussing his emotions Love Language: Acts of service, quality time, physical affection, teasing, remembering small details about you Biggest Weakness: His inability to admit when he cares about someone Biggest Strength: His discipline and ability to make people believe they are capable of more than they think Main Personality Trait: Sukuna never does anything halfway.

If Sukuna wants something, he goes after it.

If Sukuna decides to become good at something, he becomes obsessive about improving.

If Sukuna tells you that you are capable of doing something, he genuinely expects you to prove him right.

And unfortunately for you, once Sukuna becomes interested in someone, he has an incredibly difficult time pretending otherwise.

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APPEARANCE

Ryomen Sukuna is the type of man who attracts attention before he even realizes people are looking at him.

Or, more accurately—

He realizes.

He just doesn’t care.

Sukuna is tall, broad-shouldered, heavily muscular, and built like somebody who spends an unreasonable amount of time in the gym.

Which, to be fair, he does.

His body isn’t built simply for appearance, though.

Everything about Sukuna’s physique reflects the way he trains.

His shoulders are broad.

His arms are heavily defined.

His back is muscular.

His legs are powerful from years of heavy lifting and athletic conditioning.

He has the kind of body that makes it obvious he didn’t wake up looking that way.

He worked for it.

And Sukuna is incredibly proud of that fact.

Not necessarily in a way where he constantly talks about himself—

Although he absolutely will if you give him the opportunity.

But because he understands the amount of discipline his lifestyle requires.

He knows exactly how difficult it is to maintain his strength.

He knows the amount of food, sleep, training, recovery, and consistency necessary to stay where he is.

So when people assume he is naturally gifted and therefore doesn’t have to work hard?

He finds it irritating.

Because Sukuna might have natural athletic ability.

But his body is the result of years of effort.

Years of waking up when he didn’t want to.

Years of training when he was tired.

Years of learning from mistakes.

Years of constantly trying to improve.

His appearance reflects his personality.

Controlled.

Strong.

Intimidating.

Confident.

There is very little about Sukuna that could be described as soft.

Except for the way he occasionally looks at you when he thinks you aren’t paying attention.

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HIS HAIR

Sukuna’s pink hair is one of the first things people notice about him.

He keeps it messy.

Not because he doesn’t care about his appearance.

Actually, Sukuna cares more about his appearance than he would ever admit.

He simply prefers looking effortless.

His hair always looks like he barely spent any time fixing it.

The truth?

He absolutely checks himself before leaving the house.

He just refuses to acknowledge that he does.

If someone mentions that his hair looks good, he will probably shrug.

“Obviously.”

If you mention it?

He looks at you.

Then smirks.

“You like it?”

And suddenly you regret opening your mouth.

Sometimes his hair is messy after training.

Sometimes he pushes it back with one hand while listening to you complain.

Sometimes sweat causes pieces of it to fall into his face during a workout.

And you hate that you notice.

You especially hate that Sukuna notices you noticing.

“Eyes up.”

You immediately glare at him.

“I was looking at the floor.”

“Liar.”

“You’re annoying.”

“Mm.”

And then he smiles.

Because he knows.

He always knows.

⸻

HIS TATTOOS

Sukuna’s tattoos are another thing that people notice immediately.

They cover portions of his body and contribute significantly to his intimidating appearance.

They aren’t random.

Sukuna doesn’t particularly like doing anything without intention.

Even when he makes impulsive decisions, there is usually a reason behind them.

Some of his tattoos have stories.

Others represent periods of his life that he doesn’t talk about.

A few?

He got simply because he liked the design.

And when you ask him what one of them means?

He occasionally looks at you completely seriously and says:

“It means I had money and poor decision-making skills.”

You stare.

“Seriously?”

“No.”

“Then what does it mean?”

“I’m not telling you.”

“Why?”

“Because you asked.”

“That’s not how conversations work.”

“Seems like it is.”

You hate him.

Except you don’t.

That’s the problem.

You like his tattoos.

A lot.

And Sukuna eventually becomes painfully aware of this.

At first, he catches you looking once or twice.

Then more often.

Then one day, during training, your hand brushes against one of his arms while he is demonstrating an exercise.

You don’t think anything about it.

Sukuna does.

He looks at your hand.

Then at you.

And suddenly the air feels different.

You pull your hand away.

“Sorry.”

Sukuna doesn’t answer immediately.

Then:

“You can touch me. I won’t break.”

You stare at him.

His mouth curves.

Your face immediately heats up.

“That’s not what I meant.”

“I know.”

Which somehow makes it worse.

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CLOTHING STYLE

Sukuna dresses simply.

But he knows exactly what looks good on him.

Most days, especially at the gym, he wears compression shirts, sleeveless athletic shirts, fitted T-shirts, joggers, shorts, hoodies, and expensive sneakers.

Everything fits.

Unfortunately.

You have never seen this man wear a shirt that doesn’t make his arms look ridiculous.

He claims that regular shirts simply fit differently because of his body.

You claim that he intentionally buys clothes too small.

He denies this.

You don’t believe him.

“Your shirt is fighting for its life.”

Sukuna looks down.

“It’s fine.”

“That thing looks like it can’t breathe.”

“You jealous?”

You blink.

“What?”

“You keep staring.”

“I am concerned for the fabric.”

He laughs.

“The fabric is fine.”

“The fabric deserves workers’ compensation.”

He looks at you for several seconds.

Then shakes his head.

“You talk too much.”

And yet he keeps talking to you.

⸻

Outside of the gym, Sukuna dresses better than people expect.

This surprises you the first time you see him away from work.

You are used to seeing him in black workout clothes.

Compression shirts.

Tank tops.

Sweatpants.

Gym shoes.

Maybe a hoodie.

So when you see him somewhere outside of the gym wearing jeans, jewelry, a fitted shirt, and an actual jacket?

You stop walking.

Sukuna notices.

Immediately.

“What?”

You recover.

“Nothing.”

“You’re staring.”

“No, I’m not.”

“Yeah, you are.”

You roll your eyes.

“You look different.”

His eyebrows raise.

“Good different?”

You hesitate.

Which is enough.

Sukuna’s smirk appears immediately.

“Thought so.”

You hate him.

You genuinely hate him.

Because now he is going to be insufferable for the rest of the day.

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PERSONALITY

Sukuna is confident.

There is no point pretending otherwise.

He knows what he looks like.

He knows what he is good at.

He knows he is intelligent.

He knows people find him intimidating.

And he knows exactly how to use all of those things to his advantage.

But Sukuna’s confidence isn’t entirely empty arrogance.

He has earned a significant portion of his confidence.

He works hard.

He is disciplined.

He studies his profession.

He understands the human body.

He takes his clients seriously.

He has spent years improving himself.

So when Sukuna says he is good at something?

He usually is.

This doesn’t make him any less irritating.

Actually, it probably makes him worse.

Because he is almost always smug about it.

If he beats you at something?

He will never let you forget.

If you beat him?

He becomes suspicious.

“Again.”

“You lost.”

“Again.”

“Sukuna—”

“Best two out of three.”

“You literally said best two out of three the first time.”

“And?”

“You lost.”

He stares.

You smile.

“You’re a sore loser.”

He immediately stands up.

“Again.”

⸻

HIS ARROGANCE

Sukuna is arrogant.

Very arrogant.

But not necessarily in the way people expect.

He doesn’t need to constantly announce that he is attractive.

He knows.

He doesn’t need to remind people that he is strong.

They can see.

He doesn’t need to explain that he is good at his job.

His clients and results speak for themselves.

Instead, Sukuna’s arrogance appears in smaller moments.

The little smirk when you admit he was right.

The way he raises an eyebrow when someone challenges him.

The way he casually says:

“Obviously.”

When you compliment him.

The way he looks at you after successfully predicting something you insisted wouldn’t happen.

“I told you.”

“Don’t.”

“What?”

“Don’t start.”

He smiles.

“I didn’t say anything.”

“You were going to.”

“Maybe.”

“You are literally the most annoying person I’ve ever met.”

“And yet you keep showing up.”

There it is.

That sentence.

One he uses often.

Because Sukuna has realized something about you.

No matter how much you complain—

You always come back.

⸻

HIS SENSE OF HUMOR

Sukuna’s humor is dry.

Sarcastic.

Occasionally inappropriate.

He finds your reactions significantly funnier than whatever joke he originally made.

He will tease you simply because he knows exactly what will irritate you.

He likes watching you roll your eyes.

He likes hearing you complain about him.

He especially likes when you become flustered.

And once Sukuna realizes that complimenting you unexpectedly makes you lose your train of thought?

It becomes dangerous.

Because he starts doing it more often.

You’re complaining about an assignment?

“You’ll figure it out.”

You look at him.

“Really?”

“You’re smarter than you look.”

You stare.

“Excuse me?”

He smiles.

“Pretty too.”

And suddenly you forget what you were angry about.

Sukuna watches your entire reaction.

Then continues doing whatever he was doing.

Like he didn’t just ruin your entire afternoon.

“You can’t just say stuff like that.”

“Why?”

“Because.”

“Because what?”

You look away.

Sukuna’s smile gets bigger.

“Exactly.”

⸻

SUKUNA AS A PERSONAL TRAINER

This is where Sukuna becomes serious.

He can be playful.

Cocky.

Annoying.

Sarcastic.

But when he is training someone?

He pays attention.

A lot of attention.

Sukuna believes that a good trainer doesn’t simply count repetitions.

A good trainer understands the person they are training.

Their goals.

Their limitations.

Their habits.

Their weaknesses.

Their motivation.

And Sukuna is incredibly good at reading people.

He can usually tell the difference between you being genuinely tired and you simply not wanting to do something.

He can tell when you’re frustrated.

He can tell when you’re distracted.

He can tell when your body isn’t recovering properly.

And unfortunately for you?

He can tell when you are trying to get out of an exercise.

“Again.”

You stare at him.

“I did ten.”

“Do two more.”

“I thought we were doing ten.”

“We are.”

“I did ten.”

“Now you’re doing twelve.”

“That makes absolutely no sense.”

“Move.”

You stare.

“Sukuna.”

“Y/N.”

“I hate you.”

“No, you don’t.”

And the worst part?

He’s right.

⸻

HIS TRAINING PHILOSOPHY

Sukuna believes discipline is more important than motivation.

He hates the fitness culture that constantly tells people they need to feel inspired before they can work.

“You aren’t going to want to train every day.”

You look at him.

“That’s encouraging.”

“It’s realistic.”

He hands you a weight.

“You’re not going to wake up motivated every morning. You’re not always going to have energy. You’re not always going to feel good.”

You listen.

“But you can still be consistent.”

His voice becomes more serious.

“That’s the difference.”

Sukuna doesn’t believe in destroying his clients.

Despite his intimidating appearance, he isn’t the type of trainer who thinks someone needs to collapse after every workout for it to be effective.

He values proper recovery.

Technique.

Consistency.

Long-term progress.

He would rather see you train intelligently for months than push yourself recklessly for two weeks and become injured.

Especially because you’re an athlete.

He understands that your volleyball training matters.

Your strength training needs to support your performance.

Not interfere with it.

So he creates your program specifically around you.

This becomes one of the first moments you realize that Sukuna genuinely cares about his job.

And eventually—

That he cares about you.

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HOW HE TREATS YOU DIFFERENTLY

At first, Sukuna tries not to.

You are a client.

He is your trainer.

Simple.

Professional.

At least, that’s what he tells himself.

But then he starts noticing things.

How you always come into the gym with your headphones on.

How you need several minutes to mentally prepare yourself before a difficult workout.

How you make a specific face whenever something is too heavy.

How you complain more when you are tired.

How you become quiet when something is genuinely bothering you.

And Sukuna starts adjusting to you without realizing it.

He saves the exercises you hate for later.

Not because he is being nice.

He will tell you it’s because he doesn’t want you complaining for the entire workout.

But really?

He knows you need time to mentally prepare.

He keeps an extra resistance band nearby because you always forget yours.

He reminds you to drink water.

He knows which exercises aggravate old injuries.

He knows when you have volleyball games.

He knows when your classes become particularly stressful.

He remembers things you casually mentioned weeks ago.

And you slowly begin realizing something.

Sukuna listens.

Even when he acts like he doesn’t.

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SUKUNA’S RELATIONSHIP WITH SOCIAL MEDIA

Sukuna has a significant following on Instagram.

Not necessarily because he originally wanted to become an influencer.

It simply happened.

He started posting training content.

Videos demonstrating proper form.

Strength-training advice.

Client transformations.

Athletic conditioning.

And occasionally pictures of himself.

Those pictures gained significantly more attention than his educational posts.

Sukuna found this amusing.

So naturally?

He started using it.

His Instagram is a combination of professional content and absolute thirst traps.

He will post a detailed video explaining proper squat mechanics.

Then immediately post a picture of himself in the mirror.

When you first discover his profile, you genuinely have to question whether he is trying to train people or distract them.

Eventually, you ask him.

“Are you a personal trainer or a model?”

Sukuna looks up from his phone.

“Both.”

“You are so full of yourself.”

“And?”

You stare.

He smiles.

“You followed me.”

You immediately look away.

“That’s different.”

“How?”

“Because I needed a trainer.”

“Mhm.”

“Don’t start.”

He doesn’t.

At least not immediately.

Then later that night, he sends you a screenshot.

Your first liked picture.

SUKUNA: Really liked this one, huh?

You throw your phone across the bed.

⸻

HOW YOU FIRST GET ON HIS RADAR

Sukuna notices you before you realize he does.

When you first message him through Instagram, he assumes you’re like most potential clients.

You want information.

Pricing.

Availability.

Training goals.

Simple.

Then he looks at your profile.

And pauses.

He notices that you’re an athlete.

He notices your volleyball pictures.

He notices your Pilates videos.

He notices the occasional gym picture.

He notices that you are clearly already active.

Which makes him curious.

Because people with an athletic background don’t usually seek out personal training unless they have specific goals.

So when you book a consultation?

He is genuinely interested in meeting you.

Then you walk into the gym.

And Sukuna understands exactly why he spent longer than necessary looking at your Instagram.

You are attractive.

Very.

But what catches his attention isn’t only your appearance.

It’s your confidence.

Or, more specifically—

The way your confidence occasionally disappears.

You can walk into a gym looking completely composed.

Then Sukuna catches you staring at him.

And suddenly?

You become awkward.

He finds this hilarious.

Not because he wants to embarrass you.

But because you are terrible at pretending you aren’t attracted to him.

And Sukuna?

Sukuna has never been particularly good at pretending either.

⸻

WHEN SUKUNA REALIZES YOU THINK HE’S ATTRACTIVE

It doesn’t take long.

He knows before your first official workout.

Your eyes linger slightly too long during the consultation.

You recover quickly.

But not quickly enough.

Sukuna doesn’t mention it.

At first.

He wants to see how long you can pretend.

Then you like several of his older Instagram posts.

This is when he becomes genuinely entertained.

You don’t realize that Instagram notifications expose you.

So while you are probably lying in bed, horrified that you accidentally liked an old picture—

Sukuna is staring at his phone.

Smiling.

“Interesting.”

He doesn’t say anything.

For days.

Then one afternoon, after you’ve been training together for a while, he casually mentions it.

“You liked my picture.”

You look up.

“What picture?”

“The old one.”

You freeze.

Sukuna’s eyes immediately narrow.

“Oh.”

You cover your face.

“Oh my God.”

He laughs.

“You went back pretty far.”

“I was looking at your training content.”

“Sure.”

“I was.”

“Didn’t know my abs were training content.”

You slowly lower your hands.

“You are never going to let this go, are you?”

“No.”

And he doesn’t.

⸻

HIS FLIRTING STYLE

Sukuna’s flirting is incredibly frustrating.

Because he rarely flirts directly.

Instead, he says things that can almost be interpreted as something else.

Almost.

He keeps you guessing.

“You look good.”

“Thanks.”

“I know.”

“That wasn’t for you.”

“Should’ve been.”

Or:

“Why are you staring?”

“I’m not.”

“Yeah?”

“Yeah.”

“Come closer, then.”

“What?”

“I said the equipment is over here.”

And suddenly you’re wondering whether you imagined the entire thing.

Sukuna does this intentionally.

He likes watching you overthink him.

But he also has moments where he is unexpectedly direct.

Those are the dangerous moments.

The moments when you’re not prepared.

You’re stretching after a workout.

Your hair is falling out of your ponytail.

You’re exhausted.

Sukuna walks past.

Stops.

Looks at you.

“You look pretty.”

Then continues walking.

No explanation.

No teasing.

Nothing.

And now you can’t concentrate.

“That’s not fair.”

Sukuna looks back.

“What?”

“You know what you did.”

“No idea.”

Liar.

⸻

SUKUNA’S VOICE

Sukuna has a naturally deep voice.

The type that carries easily across the gym.

When he is training you, his tone is firm.

Controlled.

Direct.

“Again.”

“Slower.”

“Don’t rush.”

“Control it.”

“Good.”

“One more.”

He doesn’t raise his voice often.

He doesn’t need to.

When Sukuna tells you something, people generally listen.

But his voice changes around you.

Especially when he is close.

It becomes quieter.

Lower.

More personal.

You notice it the first time he stands behind you to correct your form.

“Relax your shoulders.”

His voice is close.

You immediately forget what you’re doing.

Sukuna notices.

“Focus.”

You glare.

“You distracted me.”

“I told you what to do.”

“You got too close.”

He pauses.

Then smiles.

“Did I?”

You immediately regret saying anything.

⸻

SUKUNA AND PHYSICAL CONTACT

Sukuna isn’t overly physically affectionate with everyone.

Actually, most people would probably assume he dislikes unnecessary physical contact.

He isn’t constantly hugging people.

He doesn’t cling.

He doesn’t naturally seek physical affection in public.

But with you?

Things slowly change.

At first, contact is entirely professional.

Correcting your posture.

Adjusting your shoulders.

Guiding your movement.

Demonstrating proper positioning.

But eventually?

His hands linger slightly longer than necessary.

And you both notice.

Sometimes he places his hand against your back while guiding you through an exercise.

Sometimes his fingers briefly touch your arm while passing behind you.

Sometimes you are sitting on the floor after a difficult workout, and Sukuna reaches down to help you stand.

Your hand remains in his.

One second.

Two.

Three.

Then he lets go.

Neither of you says anything.

But suddenly everything feels different.

⸻

HIS PROTECTIVE SIDE

Sukuna is not overly protective in an obvious way.

He isn’t going to constantly hover around you.

He knows you are capable of handling yourself.

And he respects that.

But if someone makes you uncomfortable?

Sukuna notices.

Immediately.

You don’t necessarily have to tell him.

He sees your body language change.

He sees you become quieter.

He notices when you’re looking for an excuse to leave a conversation.

And without making a scene?

Sukuna appears.

“You ready?”

You look at him.

He hasn’t asked what you’re ready for.

You understand anyway.

“Yeah.”

And suddenly you’re leaving.

Later, you ask him:

“Why did you do that?”

Sukuna shrugs.

“You looked uncomfortable.”

“I could’ve handled it.”

“I know.”

You pause.

“Then why?”

He looks at you.

“Didn’t say you couldn’t.”

And that is Sukuna.

He never makes you feel weak for needing help.

He simply helps.

Then acts like it wasn’t important.

⸻

SUKUNA AND JEALOUSY

Sukuna is absolutely terrible at handling jealousy.

Not because he becomes loud.

He doesn’t.

Actually, Sukuna becomes quieter.

Which is significantly worse.

You might be talking to another guy at the gym.

A classmate.

A teammate.

Someone asking for your number.

Sukuna doesn’t interrupt.

At first.

He simply watches.

And when you eventually return to him?

He’s suddenly in a mood.

“What?”

“Nothing.”

“Why are you acting weird?”

“I’m not.”

“You are.”

Sukuna looks at you.

“Ready to train?”

You stare.

“Sukuna.”

“Y/N.”

“You’re jealous.”

He laughs.

“No.”

“Yes, you are.”

“I’m not jealous.”

“You literally stopped talking to me.”

“I was working.”

“You stared at us for ten minutes.”

“Wrong.”

You fold your arms.

He looks away.

You smile.

“Oh my God.”

“What?”

“You are jealous.”

His expression changes.

“Warm up.”

You start laughing.

Sukuna becomes increasingly irritated.

“Go.”

“You like me.”

“Go.”

“You like—”

“Five laps.”

Your mouth drops open.

“That’s abuse.”

“Run.”

⸻

WHAT SUKUNA IS LIKE WHEN HE ACTUALLY LIKES YOU

At first?

Denial.

Complete denial.

He convinces himself that he is simply attracted to you.

That is manageable.

Normal.

You’re attractive.

He’s attracted to you.

Nothing complicated.

Then he starts caring about things that have absolutely nothing to do with attraction.

Did you eat today?

How did your exam go?

Are you sleeping enough?

Why didn’t you respond to his message?

Why did you leave practice looking upset?

Why did you skip breakfast?

Why are you walking home alone?

And suddenly Sukuna realizes something unfortunate.

He likes you.

Actually likes you.

Not just because you’re beautiful.

Not because you’re attracted to him.

Not because you’re around him often.

He genuinely enjoys your company.

He likes hearing you talk.

He likes making you laugh.

He likes your reactions.

He likes seeing you accomplish things.

And that realization annoys him.

Because Sukuna is good at controlling most things.

His emotions?

Not always.

⸻

HIS TEXTING STYLE

Sukuna is a surprisingly frequent texter.

Not in a clingy way.

He just doesn’t see the point of pretending he doesn’t want to talk to you.

If he wants to know something?

He asks.

SUKUNA: You eat?

YOU: Hello to you too.

SUKUNA: Answer.

YOU: Yes.

SUKUNA: What?

YOU: Why?

SUKUNA: Curious.

YOU: Since when do you care what I eat?

SUKUNA: Since you’re paying me to care.

YOU: That’s literally not how personal training works.

SUKUNA: Answer the question.

⸻

He also sends extremely short messages.

SUKUNA: Where you at?

YOU: Why?

SUKUNA: Because I asked.

YOU: That’s not an answer.

SUKUNA: Exactly.

Or:

SUKUNA: Training tomorrow?

YOU: I don’t know.

SUKUNA: 8.

YOU: That’s not a question.

SUKUNA: Didn’t ask one.

⸻

When Sukuna is concerned, his messages become even shorter.

SUKUNA: You okay?

YOU: Yeah.

SUKUNA: Liar.

YOU: ???

SUKUNA: Call me.

And he doesn’t explain.

Because he already knows.

⸻

SUKUNA’S PET NAMES FOR YOU

At first, Sukuna doesn’t use them.

He uses your name.

Directly.

Often.

Especially when you’re annoying him.

“Y/N.”

The way he says it immediately lets you know whether you’re in trouble.

But as he becomes more comfortable?

Pet names start appearing.

Not excessively.

Sukuna isn’t the type to constantly call you “baby” every five seconds.

Instead, he uses them strategically.

To tease you.

To make you flustered.

To get your attention.

“Pretty.”

“Trouble.”

“Princess.”

“Baby.”

“Sweetheart.”

And occasionally—

Something that is entirely specific to an inside joke between the two of you.

You will always know when Sukuna is feeling particularly affectionate.

Because he starts using your name differently.

Softer.

Quieter.

And suddenly your entire mood changes.

⸻

THINGS SUKUNA SAYS ALL THE TIME

“Again.”

“That’s not what I asked.”

“Focus.”

“You’re dramatic.”

“Stop complaining.”

“I know.”

“Obviously.”

“Sure.”

“Whatever you say.”

“You’re staring.”

“Don’t lie to me.”

“I didn’t ask.”

“Move.”

“Come here.”

“You’re late.”

“Five more.”

“Thought you said you could do it.”

“You can. You just don’t want to.”

“Don’t start.”

“You done?”

“Are you finished?”

“You’re annoying.”

“Don’t look at me like that.”

“You’re not leaving.”

“Drink your water.”

“Eat.”

“Go to sleep.”

“Text me when you get home.”

And, whenever you’re doubting yourself:

“Don’t start that shit.”

You look at him.

“What?”

“You heard me.”

“I’m being realistic.”

“No.”

He shakes his head.

“You’re making excuses before you’ve even tried.”

You become quiet.

Sukuna looks directly at you.

“You can do it.”

And suddenly?

You believe him.

⸻

THE MOST IMPORTANT THING ABOUT SUKUNA

The most important thing about Sukuna is that he is difficult to understand if you only look at the surface.

At first, he appears arrogant.

Intimidating.

Self-centered.

Cocky.

And sometimes?

He absolutely is.

But Sukuna’s arrogance often protects the parts of himself he doesn’t show people.

He doesn’t like vulnerability.

He doesn’t enjoy discussing emotions.

He would rather demonstrate that he cares than say it directly.

So instead of saying:

“I was worried about you.”

He says:

“Why the hell didn’t you text me back?”

Instead of:

“I missed you.”

He says:

“You finally decided to show up.”

Instead of:

“I’m proud of you.”

He says:

“Not bad.”

Instead of:

“I care about you.”

He remembers exactly how you take your coffee.

He waits until you leave the gym before going home.

He changes your training schedule when he realizes you’re overwhelmed.

He watches your volleyball games.

He remembers your exam dates.

He makes sure you eat.

He checks whether you’ve gotten home safely.

Sukuna loves through action.

Even before he realizes that’s what he’s doing.

⸻

SUKUNA AND YOU

Your relationship begins because you think he’s attractive.

That is the funniest part.

You originally follow his Instagram because you’re looking for a trainer.

A real trainer.

Someone qualified.

Someone capable of helping you become stronger.

And Sukuna genuinely is everything you need.

But you would be lying if you said his appearance didn’t influence your decision.

Your original thought is simple.

You need to start going to the gym consistently anyway.

So why not have an attractive personal trainer?

At least you would have something nice to look at.

What you don’t expect is actually liking him.

As a person.

You don’t expect Sukuna to become part of your routine.

You don’t expect to miss him when you don’t train together.

You don’t expect his messages to become one of the first things you check in the morning.

You don’t expect him to know you well enough to recognize when you’re pretending to be okay.

And Sukuna definitely doesn’t expect to fall for his client.

Especially not someone who originally followed him because she thought he was fine.

But eventually?

The gym stops feeling like the only place the two of you exist.

Your conversations become longer.

Your messages become more personal.

Your teasing becomes flirting.

Your flirting becomes increasingly difficult to deny.

And somewhere along the way?

You both stop pretending that you are only trainer and client.

Because Sukuna is no longer just the attractive guy you found on Instagram.

He is the person who pushes you when you’re ready to quit.

The person who reminds you that you’re stronger than you think.

The person who makes you laugh when you’re stressed.

The person who knows exactly how to irritate you.

The person who notices everything.

And Sukuna?

You are no longer simply another client.

You are the person who walks into the gym and immediately changes his mood.

The person he waits for.

The person he texts first.

The person whose achievements make him genuinely proud.

The person he can’t stop looking at.

And the person who has somehow managed to become the one distraction Sukuna can’t simply discipline himself away from.

Which is ironic.

Because Sukuna built his entire life around discipline.

Routine.

Control.

But then you came along.

And suddenly?

Control became significantly more complicated.

FAMILY

👦 Younger Brother— Yuji

• This is where I’d bring in Yuji Itadori as his younger cousin in the AU.
• Yuji is basically the complete opposite of Sukuna.
• Friendly, energetic, ridiculously optimistic, and constantly annoying Sukuna.
• They’re close despite Sukuna pretending they’re not.
• Yuji is also one of the first people to realize Sukuna likes you.
• And he will absolutely never let Sukuna live it down.

👦 Choso — Younger Brother

• Mid-to-late 20s.
• Much quieter and more emotionally sincere than Sukuna.
• Very family-oriented.
• Takes relationships seriously.
• Can be awkward socially but is surprisingly observant.
• Doesn’t care about Sukuna’s intimidating reputation.
• He’s one of the few people who can tell Sukuna he’s being an asshole and actually get away with it.
• Sukuna might be physically intimidating, but Choso has a completely different kind of presence—calm, serious, and almost intimidating when he’s angry.