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How Much of You Possesses Me

Summary:

Sukuna stiffens as Megumi sucks on his scent gland but relaxes when the omega’s purrs grow louder. His chuffs stop and Megumi pauses. The alpha carefully pulls the boy away from his throat, though his mouth is set in a small grin when his face comes into view. Megumi sighs in relief.

“Omega,” Sukuna murmurs, voice deep and rumbly, “do you understand what’s happening?”

AKA Megumi goes into heat after seeing his alpha. Sukuna takes charge.

Notes:

To preface; Megumi is 11-12 years old. Sukuna is in his 30s.

(See the end of the work for more notes.)

Work Text:

The world revolves around fated mates, from romance movies to silly scandals between celebrities. People are all too obsessed with the idea, and Megumi finds it pretty stupid.

Why would someone throw away everything to find ‘the one’? He’s heard of those who go nearly homeless in attempts to traverse the world just to find their fated mate. What a waste of time! Megumi can’t imagine going to such efforts for something that would happen naturally. He’s perfectly fine with waiting.

And it isn’t even a common thing. Most people grow up without a mark, something that shows up not long after the presentation of a secondary gender. Lucky people rarely boast either, as it’s such an intimate thing.

Gojo taught him that. Megumi has only experienced two heats, as his mark appeared just a few days after the first. When the inky black bands itched their way into the skin of his wrists overnight, he’d been relieved to know he could hide them from the eyes of those unwelcome. Long sleeves are now his trademark fashion.

It was weird at first. Knowing that somewhere out there, another person held his marks. He knows enough about how it works, especially after learning two of his teachers are fated mates. One of them has a swirly ring mark around her neck while her mate has the same one on his, but with long, dangly tendrils. They matched but were unique to each other.

A boy in his class asked them about it one day, and while Megumi cringed at the invasiveness, the man still answered.

“Mine are thin and graceful, just as beautiful as she is,” he said.

Megumi likes that. That someone’s mark can be a testament to the character of their fated.

Touching his wrists is a comfort. He’ll meet them one day.

One thing he is glad hasn't changed since presenting as an omega is his dynamic with Gojo. The alpha still teases him and ruffles his hair while Megumi pretends to hate it. Gojo’s still the man who adopted him.

There are days when Megumi finds it hard to be a big kid. When his need to be responsible and mature turns too overwhelming.

These days, Gojo will stay home from work, and instead attend his meetings on his work laptop. Megumi curls up on his lap, sniffling away the bad emotions while inhaling the calm scent of home. Gojo’s business partner indulges in the last-minute virtual sessions with a grumbling complaint to the white-haired alpha. Megumi always watches with interest as the two share calculated but light-hearted jabs. Most of the time he doesn’t understand the humor anyway.

Gojo’s business partner is fascinating. He’s an alpha, the other head of the Gojo-Ryoumen Conglomerate — Ryoumen Sukuna.

Megumi knows it’s impolite to stare — always glares at people who can’t keep their eyes to themselves. But when it comes to Ryoumen Sukuna, he can’t help it.

The alpha not only stands even taller than Gojo, a giraffe, but he fills out his suits handsomely. Like his muscles strain to fit underneath. Megumi wonders if his tailor knows how to do their job correctly, or if the point is to show how nice his body is. Of course, the first thing everyone is drawn to is the alpha’s marks. His fated marks are all over his face. Stark, geometric lines framing his sharp, attractive features.

During his second heat, Megumi couldn’t stop imagining him. Writhing in the painful throes of sleep and aching discomfort, all he could think of was the intense darkness of the alpha’s red eyes.

At that time, he’d filled his underwear with creamy liquids just visualizing Ryoumen, so Megumi’s glad to have never met him in person.

In the summer time though, Megumi has far too much free time to spend alone. Gojo can’t stay home with him as much. And Megumi would be caught dead before he begs him to.

So he spends most of his time in jujutsu training. The studio is beautiful, large, and well-kept over the years of its old-fashioned architecture. Run by an old friend of Gojo’s, Nanami-sensei’s studio is a common reprieve from Megumi’s loneliness at home.

The drive there is quick by himself. When Gojo drives instead of their chauffeur, they tend to end up late to their destinations.

Once he’s got his bag secured on his shoulder, Megumi jumps out of the car. He skips ahead of the guards parking the vehicle.

Closed.

Megumi frowns, reading the paper taped to the door. It seems Nanami has taken a week-long break. A vacation, Megumi assumes. He winces, hoping he hadn’t been unintentionally ignoring his sensei at the last training session, and instead, maybe Nanami had just missed it.

He turns back to the car, frowning a little. The guards tilt their heads in question at his approach, perking up to step forward if needed.

“The studio isn’t open today,” he mumbles, opening the door. “Take me to Gojo, please.”

He’ll just hope the alpha isn’t too busy. On some days, he lets Megumi take naps on the couch in his office. Gojo spends enough time there that it smells like home.

Using the stairs instead of the elevator, Megumi counts his steps, taking advantage of the opportunity to exercise.

When Megumi enters, the top floor is quiet. Workers are sparse, the ones there function covertly at their desks. Megumi passes them, and those who notice him offer small, kind smiles.

Entering the main hall, the guards station themselves at the doorway. Megumi continues, scalp prickling the further he goes. The hair on the back of his neck raises, sticking out under goosebumped skin. He turns around just to find the same guards. Swinging himself in a quivering shake, Megumi stiffly faces forward and trudges on.

It’s nothing. He’s being paranoid.

Body stiff with awareness, Megumi tries his best to smother the unease inside. Feet dragging, he pushes through Gojo’s office door.

“Hey, Gojo. The studio is–” Megumi chokes on his words. His feet stumble, the door slamming shut without his support.

A scent so strong and pungent surrounds him in an endless current. The waves hit him hard while he tries to catch his breath. In and out. A quick breath in leaves just as soon flooded with the smell permeating around him. He’s hyperventilating.

It isn’t Gojo sitting at the table.

Megumi locks eyes with Ryoumen Sukuna, a shocked laugh leaving his trembling lips. There’s no way, this isn’t– this couldn’t possibly be happening to Megumi.

Slick trickles through the fabric of his pants between his legs. Humiliated and overwhelmed, Megumi trips over himself, tumbling backward. Thick, strong arms wrap around him, tugging him upright. Ryoumen’s holding him up in a tight embrace, body surrounding him entirely. Megumi’s face presses into his abdomen, lips feeling the ridges of his muscles through his shirt. Face heating up, Megumi can’t help but whimper.

Ryoumen’s stomach clenches and he steps back. His hands wrap around Megumi’s underarms, scooping him up. His thighs settle onto the alpha’s hips, his much smaller frame held up against the large expanse of Ryoumen’s torso. Closer now, Megumi’s chest and shoulders are pushed against the swell of Ryoumen’s pecs.

Straightened up, Ryoumen strides across the room, holding Megumi to him with one arm. He sits down on the couch in the corner, both arms surrounding Megumi as his hands explore the little omega’s back and waist.

The position is so intimate, so close — Megumi sat right in the alpha’s lap, wet and squirming on him. Slick gushes out of him at the contact. Megumi whimpers, shivering in embarrassment.

“No– I’m sorry. Ryoumen-san,” He gasps, horrified with himself. He can’t believe he’s doing this to Ryoumen. “I’m sorry–”

Ryoumen’s chest rumbles. He shushes him, the sound a whispering breath that has Megumi silent in an instant. He shivers in surprising relief as the spicy alpha scent levels into a tranquil presence — Ryoumen’s control of his pheromones is much better than a newly presented child. His head swims with the thickness of it in the air. He gulps lungfuls of it down greedily, settling it inside him like the most precious air to breathe.

Megumi’s eyes trail over him. His hands twitch to bury into the alpha’s hair — a dark pink, slicked back pristinely. He watches as handsome, plump lips move.

“Call me Sukuna.”

The words are fuzzy, like Megumi’s listening while wearing earmuffs. He nods.

Vaguely, he recognizes the situation; his body heat rising by the second, slick pouring out with every pump of blood in his veins—he’s going into heat.

Chuffs catch his attention, puffs of grumbling breath, deep and gentle in his ears like cotton. Megumi naturally meets it with his own vibrating purrs, stimulating from his chest and up his throat in tickles. The alpha’s chuffs raise in volume and Megumi relaxes in his hold.

Megumi finds the source of Sukuna’s scent in the patch of skin under his sharp jaw. His lips latch onto the space, suckling at the spot. The taste dissolves on his tongue, spicy like its scent, so perfect it has his legs spreading further. His crotch meets Sukuna’s, his small dick surging against the alpha’s much larger, harder bulge. The touch sends heat through his core like nothing he’s ever felt.

Sukuna stiffens as Megumi sucks on his scent gland but relaxes when the omega’s purrs grow louder. His chuffs stop and Megumi pauses. The alpha carefully pulls the boy away from his throat, though his mouth is set in a small grin when his face comes into view. Megumi sighs in relief.

“Omega,” Sukuna murmurs, voice deep and rumbly, “do you understand what’s happening?”

The words snap at something in Megumi. Mortified, Megumi yanks himself back, though he goes nowhere in Sukuna’s grasp. He misses the alpha’s warning growl as tears fill his eyes.

“I’m sorry! I wasn’t– I didn’t mean to–” He reaches out to wipe away his saliva from Sukuna’s neck. Sukuna’s hand clamps around his wrist, his arm quickly trapped between their bodies.

Sukuna’s growling, scent smelling vividly upset.

Megumi’s mind glazes over again, his voice whimpering incoherently. He cuddles against his alpha in an attempt to please him.

“Shh,” Sukuna whispers, nose rubbing against the side of his head. He inhales deeply, rumbling again alongside Megumi’s new purrs.

With Megumi docile once more, Sukuna draws out his dainty wrist. His fingers strategically flick down his sleeve one-handed.

Megumi barely blinks at the exposure of his fated mark. He watches as the alpha’s mouth twists into a satisfied expression, bringing Megumi’s wrist up to his lips. Sukuna kisses the inky band, turning his head to rub his cheek against it—scenting him. His eyes train on Megumi’s face. His dark red eyes glide up and down evenly.

Megumi’s head tilts to the side, temple resting on Sukuna’s shoulders. He shivers excitedly. Sukuna’s face buries into his exposed throat, tongue laving up the vein throbbing there.

They startle at the slam of the office door. A familiar scent sways through the room and Megumi smiles. The mixture of his homely smell and his alpha blanket him in comfort.

Sukuna’s arms tighten around him, making Megumi squeak. His voice is edged and heavy, all earlier gentleness gone. Another voice, Gojo’s, answers in an even sharper tone. It’s angry and mean, words short in retort to each response. Their scents churn in the air with tense aggression and Megumi hates it. His stomach twists as his inhaling breath takes in the bitterness.

He recognizes the whimpers of discomfort chirping from him, his fingers kneading at Sukuna’s large, flexing chest.

The voices go silent and Megumi sighs, curling impossibly closer to his alpha. His body’s heat forgotten in the warm hug of Sukuna’s much larger person.

The alphas continue their talk, voices quieter and deceptively calm. Megumi doesn’t think much of it, rubbing his head under Sukuna’s chin to draw his attention. The alpha slides his hand up and down his back to ease him back to a still position. Megumi grumbles but relents, resting in his lap.

The conversation ends on a final note, and Megumi tries to listen to what they say as Sukuna rises.

“Don’t think I won’t,” Gojo warns. Megumi, while comforted by the voice of his sire, whimpers at the hostility. They aren’t upset, are they?

“We’ll be seeing you, Gojo.”

Megumi chirps at the gravelly timbre, rubbing his ear against the thick Adam’s apple. He smiles in reward at the groan he receives. Sukuna grunts something to him and drapes his coat around Megumi’s shoulders, obscuring him from anyone’s sight. The door clicks shut behind them as they leave.

 


 

Airy leather and car fuel enter his nose. Megumi wrinkles his face, grumbling unhappily.

Sukuna chuckles, sitting down in the back of the vehicle, and sliding shut the divider between the front and back. Private and personal now, Megumi hums. Their scents twist together, filling the small space quicker as Megumi nibbles on the alpha’s throat gland. He tongues the oily skin, suckling the taste from it desperately. Breathing is much more difficult, something about the way his alpha’s smell hangs around him feels taunting. Whines of discomfort leave him, trying to understand why he feels so.

Hands rub up and down his back, one held between the entire space of his shoulder blades. Shivers wrack his spine, his body moving to push against the touch. He finds himself loving the size of his alpha; much bigger, much stronger. Like Megumi is just a small morsel tucked into Sukuna’s front.

Long, thick fingers continue to stroke his wrist, sliding over the dark ink of his fated marks. He watches on with confusion.

Sukuna must notice, as he pauses his movements. With a quick flick of his hand and his fancy cufflinks are pocketed, Sukuna slips his sleeve down.

Megumi’s eyes widen, his breath stuttering.

Sukuna has the same mark.

A raw, daunting rush of painful desire beats its way through Megumi’s body. His limbs vibrate delicately with its force. He shivers as the heat simmers ferociously in his veins. It’s nearly exhausting with the intensity of it all, feelings so deep and severe in his small body, things he’s never felt before.

The alpha — his fated kisses the top of his head, hand sliding up to brush at his sweaty hair. Heating up again, Megumi accepts the flush of cold air on the back of his neck. Stomach pains return with gusto, plummeting in his gut and cramping up. It’s too much, far too painful when his alpha is right here. He’s right there isn’t he? Megumi claws at him. What can be done? Can’t Sukuna help him?

He cries out as his gut twists, legs spreading when a heat strokes between his legs. Something — his hole burns. It burns like he’s sitting on fire. Megumi squirms, humping down on a thick thigh. Sukuna shushes him, hands grabbing Megumi’s hips and guiding him. His alpha helps him grind into him, sliding the hurt spot incessantly against him until the burn temps down. Megumi’s mouth falls open, filling with saliva that trickles a bit at the corners. Sukuna smiles and wipes it away, wrapping one arm around his waist to continue their movements.

“Sweet omega,” He coos, “we’re almost there. Just keep moving like that — feels good doesn’t it?”

Megumi nods, mouth fluttering to answer but only giving little whimpers. He clamps his lips between his teeth, looking down. He watches with wide eyes as Sukuna jerks Megumi’s hips back and forth over his thigh, pant leg covered in his slick. Megumi observes with fascination as the alpha’s already large groin fattens out further.

“Making me feel good, too,” Sukuna explains, pulling his hand away from Megumi’s drooling mouth to grope himself. His ringed fingers slide over his bulge, gripping it hard.

Hesitant, Megumi’s hand slips between them. Sukuna nods with a bigger grin. Megumi, encouraged, places his hand next to Sukuna, touching the end of the alpha’s cock. The girth is intimidating, like the width of a bat plumping even bigger. The fabric of his pants strains to cover it, tight and taut. Distracted, Megumi jumps when Sukuna fastens his suit jacket over Megumi again. Megumi whines as they thrust together when Sukuna leaves the car. The friction is too much from the sudden movement.

Sukuna makes quick work getting them inside. They’ve arrived at a large home, a countryside estate, he foggily sees.

His alpha’s home.

Purrs vibrate from him, cuddling in Sukuna’s arms as they weave through fancy hallways and rooms. Doors snap shut, and Sukuna slows down in this particular room. He drops the jacket from Megumi, the omega shuddering in the rush of cold air. It’s soon replaced by soft sheets, laid down on a massive, beautiful bed.

It smells like Sukuna, Megumi realizes.

He stretches his limbs out, wiggling around to spread his own scent. That would be nice, he smiles. So good. The mixture of his scent — the subtle airy smell of sandalwood. It calms the commanding presence of spicy incense permeating through the room and embedded into the sheets.

He could roll in the aroma forever.

Megumi gasps as Sukuna plasters himself on top of him. His hands land on either side of Megumi’s head, legs bracketing him. His dark red eyes glint under the lamplight.

Lips crash, Sukuna kissing him hard. Megumi gasps. His first kiss. Sukuna takes advantage of his open mouth, plunging his thick tongue inside. It fills his mouth, thrusting in and out then swiping around the omega’s little mouth. Dazed, Megumi absently sucks on it, his smaller tongue flicking against Sukuna’s on every flick. The alpha hums, pulling back and inhaling. Sukuna slides a hand down Megumi’s front, feeling the shivering omega’s body as he moves it further. His hand encompasses Megumi’s crotch, grinding his palm into it.

Megumi moans, hands flying forward to – do something. Sukuna grabs his wrists in one hand, pinning them above his head easily. Twisting helplessly, Megumi chases the muted feeling of pressure on his cock. It’s so good but not nearly enough. Something more. Something better.

Whines and groans of frustration leave his lips, captured and silenced by Sukuna’s. With the alpha’s mouth dominating his, he barely notices his pants being removed. The chill on his legs snaps his eyes wide open. His body moves naturally, spreading his thighs to make room for what’s to come. Megumi’s not sure what it is, but he knows he wants it. Needs it.

Sukuna slips his underwear down his legs slowly. Teasing. Megumi growls, kicking his legs to speed it up. A slap rings his ears. He yelps as Sukuna grips his inner thigh where the skin tingles.

His alpha slapped him.

Before Megumi can feel tears blooming, Sukuna hushes him. “No, no. None of that. You’ll take what I give you. Be a good omega for me, yeah?” He asks, and Megumi nods.

Relishing the satisfied hum his alpha gives, Megumi lets Sukuna undress him. Nudity has always been private, something he keeps to himself. Sharing it with Sukuna, with his fated mate, is special. It should feel special. Does Sukuna agree? Clamping his eyes shut shields him from the possibilities. Of being rejected, of being too small, too young, too – not enough.

Sukuna gently rubs his thumbs under Megumi’s eyes. His voice is firm but kind, “You think too much. Don’t give another your attention. Not even your thoughts, love.”

Megumi’s eyes snap open. Love. Regardless of his anxieties, his heart flutters at the endearment. He needs his alpha, he knows this. At a loss for words, Megumi whimpers, hoping his eyes convey his assent.

A quick, bruising kiss is pressed to his lips before the alpha pulls back. Not far, thankfully. He slips his hands to cup under Megumi’s knees, pushing them up to his lithe torso. A flush blooms over his skin, hot all over his body. His hole is exposed, the burning sensation tamping up to a searing heat. It clenches in the air, fluttering painfully.

Megumi’s brain stops functioning as a moan forces its way from him. His alpha– he’s– Megumi tries to focus on Sukuna, his eyes glazing over. The alpha’s licking him, lapping up and around his hole. Tasting him with an animalistic passion, Sukuna buries his mouth between slicked cheeks, hands still pressing against the backs of Megumi’s thighs. Sukuna laves his tongue into the tight muscle, aggressively coaxing it to loosen and sucking up the slick that trickles free. It’s as if it’s a euphoric juice to be consumed, practically devouring the wetness directly from Megumi’s hole.

Too gone, Megumi’s hands grip the backs of his knees for leverage. Sukuna hums, hands easing up to cover the omega’s. Matching fated marks slide together, their fingers locking as the alpha breaches his tongue inside.

Megumi cries out. It doesn’t hurt anymore, the feeling of something entering him replacing the burning pains. His body wracks with shivers, pleasure rippling through his taut limbs.

He watches his cock bob up, hard and flushed a dark pink. It pulses, twitching in the air.

Clenching his fingers around Sukuna’s, Megumi lays in relaxation as the alpha’s thick tongue rubs the inside of his hole. It slithers as deep as possible, massaging his walls. The foreign sensation is numbly strange, but any thought about it is wiped away once Sukuna starts sucking again. His lips press against the rim as he coaxes out more of Megumi’s slick.

A strand of hair falls free from Sukuna’s slicked-back style. Unable to stop himself, Megumi rips a hand away to bury in the thick locks. Sukuna hums against his hole, sending him a heated look and leaning into the touch. Megumi’s fingers slip through the solid gel as more hair softens. The messiness looks so good. He can’t explain why, but his hole clenches at the sight.

More slick is pulled fresh from him into Sukuna’s mouth before the alpha pops free and nuzzles into the little omega’s hand.

Megumi hadn’t even noticed Sukuna was still dressed until he’s tearing away his shirt. The fancy button-up is thrown away with little regard, veiny hands jerking with tension as they rip his belt out from the loops of his slacks. The same slick-soaked pants are dropped alongside dark boxers.

Megumi has no time to admire the massive, muscular frame covered in even more fated marks, as Sukuna plasters himself back to him. Their bodies mold together with sweat and slick and need.

The heady scent of desire surrounds them, Sukuna flipping them over so Megumi’s lying on top. A strong arm holds him to Sukuna’s torso by his waist. Another arm slips down his back, fingers sliding between his cheeks, using the slick and saliva to press into Megumi’s tight little hole.

He gasps, unable to make a noise at the sudden feeling. It’s stranger than Sukuna’s tongue, solid in its shape and moving around deeper than ever. Not uncomfortable though, Megumi wraps his arms under Sukuna’s neck to lay his head against hard pecs — letting his alpha handle his body for him.

Sukuna hums, a smile evident in his deep voice. “Good omega.”

Megumi’s body jerks, something sending shocks pulsating from his hole. It happens again and he’s moaning. Whatever it is Sukuna’s doing, it’s undeniably pleasurable. The feeling comes from his hole but Megumi can feel it in his dick, shockwaves going up the small shaft.

Sukuna chuckles at his reactions and presses. His thick fingers stroke the spot over and over until Megumi’s keening high in the back of his throat, back arching off of Sukuna’s body. Megumi’s hips are high in the air, but Sukuna doesn’t let up, assaulting it with sharp jabs of his fingers, squelches of wetness and slick pouring outside of them.

A cry punches out from Megumi’s throat, tears springing in the corners of his eyes. His dick throbs again and again before something wet spews from the tip. Megumi whimpers, hips jerking in the air until Sukuna’s arm around his waist flattens him back down, grinding his spasming cock into his hard, muscly abdomen.

Spent, Megumi lets Sukuna fondle his fingers around the twitching pucker of his hole.

“Kiss me, love,” he murmurs. His lips are soft when Megumi meets them, slow and firm as they move together. They press gently in a tender caress. Between breaths, Sukuna nibbles his bottom lip.

“Just relax,” Sukuna whispers, “and let me handle everything.”

Megumi hums delightfully into the kiss, obediently focusing on the touch of their lips. He flinches a little as something large taps against his hole, breathing deeply when Sukuna instructs him to. His mouth opens in shock as the big object pops inside of him.

“W–what–”

He’s cut off as Sukuna shoves his tongue in his mouth, forcing Megumi to wrap his lips around the thick, wriggling muscle. It does nothing to stop the overwhelming stretch at his hole. He whines around Sukuna’s tongue, body tense. It almost hurts. A sweeping burn as he’s spread across– around–

His eyes widen, blurred with tears. Sukuna’s cock is inside him. The thick mass continues on, pushing its way past Megumi’s small, tight muscles and deeper, deeper, deeper. Oh, he hadn’t expected this– it’s too much. He can’t handle the stretch, his hole pushed way beyond its limits to accommodate something so big.

Sukuna breaks the kiss, his hand gripping Megumi’s hair to press the omega’s face against his throat. Megumi whimpers, melting into the crevice of his alpha’s neck. He inhales the spicy scent greedily, allowing the smell to fade away the pain in his lower half. It calms him enough for Sukuna to shove in one final time until his pelvis is flush with Megumi’s ass.

Megumi sobs in a moment of relief and overstimulation. Sukuna’s cock fills him up way beyond what it should, the base twitching against the spot that has Megumi’s little dick plumping up again.

“You’re so fucking good, Megumi,” Sukuna says, voice slightly slurred, fingers still stroking through his hair. “Taking me like you were born to.”

Sighing contentedly, Sukuna’s other hand grips Megumi’s perky asscheek, plants his feet on the bed, and starts to move. Megumi’s body bounces with each upward thrust, Sukuna’s cock pumping with force in order to move in and out of Megumi’s tight hole. Each thrust echoes with wet slaps, vibrating shocks of dizzying pulsations coming from inside of him.

Megumi moans with every movement, the sharp pull when Sukuna’s cock leaves halfway, the burst of delight when he thrusts back inside. It’s exhilarating. Squirming on his alpha’s cock, Megumi basks in the onslaught of pleasure. Finding a newfound obsession with this feeling, of every second the spot inside him is rubbed raw with abuse, puffy and swollen from stimulation.

Tears spill from his cheeks as Megumi latches on to Sukuna’s scent gland. The alpha groans, hips stuttering. Megumi bites him methodically, sucking out the tasty oil and biting to arouse more. Sukuna buries his face in Megumi’s own throat, licking at the base of his neck.

“Hold on,” Sukuna grunts.

Megumi shouts, a litany of whimpering moans crying from his lips as Sukuna pounds into him with powerful drives. He whines in confusion, feeling suddenly that Sukuna’s getting thicker.

Sukuna just hushes him.

Reeling, throbbing, trembling with pleasure — Megumi’s dick spills between them again. No, no, it’s too much. He can’t take it. His entire body is jerking from each slam of Sukuna’s strong hips, his cock, already far too big, growing larger by the second. There’s no way Megumi’s little body can handle it.

Sobbing in anticipation and overwhelming excitement, Megumi gasps hard as something big and round at the base of Sukuna’s cock pops in and out of him. He cries out, taut with tension.

A couple more thrusts and Sukuna’s stuck inside, his cock too inflated to be pulled free. Megumi’s mind has no room to complain. The feeling inside, of something wet pouring into him, the pump of Sukuna’s thick bulb at the entrance of Megumi’s hole, pressing unrelenting pleasure into his swollen spot — it settles something in his head. Any pain from before is flooded away, expelled by satisfaction.

With his mind all loopy, he barely flinches when sharp canines puncture the skin of his throat. It only adds a feeling of permanence to the sensations of joy.

Of utter happiness.

For a while, they just lay like that. Breathing in tandem, chests rising and falling with even breaths. Sukuna laps his tongue across the tingling burn at his neck, kissing it with a soft gentleness. So sweet. Megumi’s cheeks ache with his smile.

He idly traces the marks on Sukuna’s chest with sleepy fingers. “Why do you have so many?” Megumi asks, his voice mumbly with exhaustion and curiosity.

Sukuna hums, sternum vibrating with the noise. “Because they show how much of you possesses me,” He says. It’s said as a fact.

Megumi has to bite his lip to contain the glee that ignites inside him.

He gasps as Sukuna’s cock finally pulls free.

Notes:

- The conversation between Gojo and Sukuna is tense because Gojo thinks he's preying on Megumi's vulnerability. While that may be slightly true, it's mainly due to biology where Sukuna physically cannot stay away from his fated mate in distress. After explaining the situation, Sukuna gets Gojo to reluctantly agree to Megumi going home with him. A fated-induced heat where someone isn't mated yet can be extremely painful, so that's how Sukuna gets to help out little Megumi.
- Megumi, being so young, doesn't have any sexual experience. During his only two heats before this one, he'd never fingered himself as he didn't know that could be done. (We all know how bad sex-ed can be) So when Sukuna took control of the situation, it helped make up for Megumi's inexperience but was still surprising to him as he didn't know what it all meant at first.

Thank you all so much for reading! I hope you enjoyed it as much I had while writing it.