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Advanced Biology

Summary:

Sukuna turns back to him, his hand dragging slowly up Megumi’s calf, resting in the bend of his knee. His voice is low and gravelly when he leans close and says, “I’m gonna show him how to touch you right.”


Megumi has lost control of his life, Yuuji has no clue what he’s doing, and Sukuna just wants to teach his brother how to make Megumi feel good. With no ulterior motive whatsoever. 

Notes:

I’ve been silently lurking in this fandom for about a year now, so here’s my first contribution. It is, like all my fics, deeply unserious.

This could be considered slightly dubcon, although consent is given, Sukuna is just extremely charming/manipulative so if you don’t like that, steer clear.

Also I promise I love Yuuji, but I’m not very nice to him in this fic, whoops, sorry!

I haven’t posted anything here in ages so please be kind, and leave a comment if you like it, thanks! ♥️

Chapter 1: Basic Anatomy

Chapter Text

 

 

Megumi clenches his teeth, trying not to let the sounds of his discomfort escape. He’s failing. 

“Ahh!” 

Unfortunately Yuuji takes his little noises as encouragement. “Good?” he asks, pressing harder with his fingers before Megumi can even answer.

“Uh, nnn— it’s too— ah!” 

Megumi has no idea how they got to this point, and he’s not sure how to fix it. One minute they were sharing room-temperature wine coolers they found the pantry, talking and giggling about nothing in particular, and the next thing he knew Yuuji’s tongue was in Megumi’s mouth and his hand was down his shorts. It was fun at first, but now his buzz is pretty much gone and it’s becoming increasingly obvious that Yuuji has no idea what he’s doing. 

“Ah—ahh! It’s not—“ He’s not sure what to say to make Yuuji stop his awkward and actually kind of painful fumbling without making the situation really weird, and all the noises he can’t help making just seem to spur Yuuji on even more. 

Just as Megumi’s fingers dig into Yuuji’s wrist, there’s a loud banging on the door to the bedroom, and half a second later, it flies open, so hard it bounces against the opposite wall.

Yuuji’s hand is immediately gone, to Megumi’s relief, but he’s too busy shrieking and yanking up Yuuji’s disheveled comforter, covering his face and what he can of himself. He only manages the top two thirds of his body, his bare legs and feet sticking out the bottom end, but it can’t be helped.

“What the fuck!?!!” Yuuji yells at the intruder. Megumi can’t see who it is from under the blanket, but he can guess with near-certainty. His fears are confirmed the moment the intruder speaks, and Megumi wants to wither and die from embarrassment.

“I can’t take one more second of this,” says Sukuna, Yuuji’s older brother, sounding annoyed and kind of bored, like he didn’t just make an extremely loud and dramatic entrance. Megumi had no idea he was even home. When Yuuji told him his parents were out, he assumed they had the house to themselves. 

“It’s like torture,” Sukuna adds.

Yuuji scoffs. “Oh please, you used to bring loud twinks back to your room all the time! And what are you doing here? You don’t even live here! Just put headphones on, you dick.”

It is strange that Sukuna’s here. Yuuji’s right, he doesn’t officially live here anymore. Megumi’s pretty sure he got his own apartment a while back, as soon as he’d saved enough money, sick of arguing with their parents all the time. Megumi knows that feeling.

“Brat, I don’t give a shit that you’re getting some, it’s about time honestly,” Sukuna says, “but Legs over there sounds miserable, like they’re in pain. I don’t know what you’re doing to them, but they very obviously hate it. You okay sweetheart? Need a rescue from this idiot?”

“Oh my god,” Megumi whispers, wishing he could teleport to another planet. “I’m fine,” he manages to squeak out. 

“He said he’s fine, so get the fuck out!” Yuuji tells him. 

Megumi hears a bit of a scuffle, and what sounds like Yuuji trying to push Sukuna back toward the door, but Sukuna, taller and significantly wider than Yuuji, just brushes him off and steps closer to the bed. 

“Hey, who is that under there?” he asks suspiciously. “Those stems look familiar.” And before Megumi can stop it, he feels the blanket being tugged away from his face, surely leaving his hair a wild mess. He blinks up at Sukuna for a moment, then covers his face with his hands and lets out a groan.

“Megumi?” Sukuna sounds genuinely surprised for a moment, and Megumi peeks at him through his fingers. He has a strange look on his face. “What are you guys, dating now?”

“None of your business!” Yuuji barks at his brother, while Megumi yells “No!” at the exact same time.

Sukuna simply raises an eyebrow, looking back and forth between them a few times. “Interesting.” His eyes finally land on Megumi and stay there.

Megumi shrinks under the scrutiny of both brothers now staring at him, but keeps his eyes fixed on Sukuna. It’s been months since he’s seen him, and somehow even his rose-colored memory of his first crush doesn’t do justice to the actual man in front of him. Yuuji is handsome, but he had to grow into his looks, while Sukuna has always been gorgeous. For the first year or so after meeting him, Megumi wasn’t sure if he wanted to be like him or be underneath him, but eventually and perhaps inevitably, puberty decided for him on the latter. 

Staring at him in the flesh now, Megumi is reminded of why. His arms and chest look carved out of marble, the black tank top he’s wearing doing nothing to hide his physique. The messy hair, the smug look, the tattoos, the gray sweatpants (like come on, how is Megumi supposed to avoid sexualizing him when he’s dressed like that), all add up to Megumi turning into a barely sentient pile of goo whenever he decides to show his face. And now, he’s walked in on them fumbling their way into third base. Megumi wants to sink through the floorboards and just be absorbed into the earth.

“So what exactly was going on before I came in?” Sukuna asks, his eyes still locked on Megumi. “Did he stick it in the wrong hole?”

“Oh my god!” Yuuji laments, trying to pull on Sukuna’s arm back toward the door. Sukuna doesn’t budge, Yuuji may as well be trying to move a brick wall.

“I’m talking to Megumi, brat,” he says tersely, and shrugs Yuuji off. He takes a step closer to the bed and softens his voice. “What was it? You sounded like you didn’t like it. Was he hurting you?”

A tiny, selfish part of Megumi is elated at Sukuna’s questioning. Over the years, Sukuna has been known to be a bit overprotective when it comes to Megumi. Sure, it’s probably nothing more than misplaced brotherly affection that he really should be directing toward Yuuji, but Megumi can’t help but relish in it whenever it happens. It’s not the exact kind of attention he wants most from Sukuna, but beggars can’t be choosers, and he’ll take what he can get. He’ll only feel slightly pathetic about it later if he dwells on it too much.

Megumi’s heart pounds as he looks down at the comforter now piled in his lap. “Not… not on purpose.” 

Yuuji sputters unintelligibly, but Megumi keeps his eyes down. He doesn’t want to see whatever look of hurt or betrayal must be on Yuuji’s face right now at his admission.

“With his dick?” Sukuna asks bluntly.

“No! No.”

“Fingers?” 

Megumi hesitates. “Yeah, but like, I let him touch me, I was fine with it at first, it just…”

Sukuna sits on the corner of the bed, body turned toward Megumi. “Didn’t feel good?”

Megumi makes the mistake of looking up and accidentally meeting Sukuna’s eyes. They’re dark and intense; he almost looks angry, and Megumi feels himself shaking his head. 

Sukuna nods, frowning. “He did it too hard? Too fast?”

“I.. I don’t know, I guess. It was just… too much. I… didn’t know how to tell him,” he manages to mumble. “I didn’t want him to feel bad.” Hearing himself say it out loud, he realizes how stupid he was being.

“Sweetheart, don’t ever worry about protecting a man’s ego,” Sukuna says firmly. “Especially when it’s about your body.”

“I’m sorry, I didn’t mean—“ Yuuji tries to speak up, but Sukuna shushes him immediately.

“Sit down,” he barks at Yuuji, without turning fully away from Megumi. “This is a learning moment. So you’re gonna shut the fuck up and learn.”

Yuuji looks a bit dumbstruck, but he closes his mouth, backs up until the backs of his knees hit the seat of his computer chair, and plops down unceremoniously.

“You’re sensitive, huh?” Sukuna says, his voice softening significantly when he’s speaking to Megumi. “Physically, I mean.”

Megumi shrugs, and then nods.

“Still a virgin?”

He can hear his blood pumping in his ears. He doesn’t know why he’s never been able to lie to Sukuna. He nods again.

“Yeah, I see the problem,” Sukuna says, and turns back to Yuuji, his tone instantly harsh again. “The problem is that when a dumb little brat with no common sense has never seen a pussy in real life before, and he’s warped his brain by watching too much porn, he has no clue what to do with one when he finally gets the chance. You can’t just manhandle him and bully your way in like he’s some pro. You’ve gotta treat him delicately.” He wraps his fingers firmly, but still carefully, around Megumi’s ankle. “Luckily,” he says, grinning, “big brother is here to teach.”

Megumi’s pretty sure he’s been hyperventilating for the last few seconds. Sukuna turns back to him, his hand dragging slowly up Megumi’s calf, resting in the bend of his knee. His voice is low and gravelly when he leans close and says, “I’m gonna show him how to touch you right.” 

Megumi stops breathing altogether, suddenly aware that his face must be bright red by how hot his cheeks feel. The way Sukuna said it, it didn’t seem like a question, but his hand has paused and he does seem to be waiting for a response. For permission. 

Megumi has no idea what he’s about to agree to, but it’s Sukuna, so he takes a breath and nods his head. “Okay.”

As soon as he does, Sukuna moves quickly. He takes the comforter Megumi has been clutching for dear life since the moment this whole thing started, and pushes it out of the way, revealing a rumpled shirt and unbuttoned shorts.

Sukuna studies him a moment. “Ah, okay. Mistake number one,” he directs toward his brother. “You went in blind. That’s fine if you know what the fuck you’re doing, but obviously you’re… a beginner. You need visuals.”

He grips Megumi behind the knee and pulls him toward the end of the bed. It happens so fast that Megumi’s head is spinning. Once he’s closer, Sukuna grabs the waist of his shorts with both hands and yanks them down quickly past his knees, and off completely, dropping them to the floor, and leaving him in his underwear and shirt.

Megumi isn’t sure what he expected to happen when he agreed to whatever this is, but it somehow wasn’t ending up immediately flat on his back, stripped half naked by the man he’s been secretly obsessed with for half his life, in front of his best friend, on a random Friday night. Actually, there’s no way this is reality. He’s probably in the middle of some crazy fever dream his brain conjured up. Maybe he’s in a coma. 

“Which brings us to mistake number two,” Sukuna is saying as he positions Megumi’s legs how he apparently wants them, feet flat on the bed, knees bent. He gently pushes them apart, giving himself and Yuuji a clear view of black cotton panties. With two fingers, he rubs over the cloth covering Megumi’s clit, sweeping down toward his hole, then briefly back up again. Megumi yelps in surprise and his knees snap back together, but Sukuna’s hand is already gone.

Sukuna shows his fingers to Yuuji. “Bone dry.”

Megumi’s face is flaming at this point, and he covers it with both hands. There's simply no way that just happened. He can still feel tingles left behind by Sukuna’s touch.

“Now, I don’t know exactly how long you guys were messing around before I came in, but I’m pretty fucking sure it was long enough that if he had liked what you were doing at all, it would be a goddamn slip and slide down there.”

Megumi opens his eyes to stare at the ceiling. “Oh my god,” he whispers to himself. “This is my thirteenth reason.”

“Angel,” Sukuna says to him, once again shifting his tone completely when he addresses Megumi, so much so that Megumi feels compelled to look up at him, meeting his eyes. “Don’t be embarrassed. You did nothing wrong, okay? This is one hundred percent operator error.” His eyes are warm as he gives Megumi a reassuring smile. “You’re perfect.”

Megumi’s brain supplies the image of a cartoon arrow piercing through his chest. He suddenly remembers other times over the years when Sukuna has said these exact words to him: When he was thirteen and asked Sukuna to show him how to properly throw a punch, and he’d accidentally hit a bit too hard, clipping him in the jaw, Megumi was mortified that he might have hurt him, but Sukuna had just laughed it off, rubbed his jaw, and said, “Nah kiddo, you did great, you’re perfect.” Or when he was fifteen and going through the shit with Toji, and Yuuji’s parents let him stay for a few weeks until things settled down and Sukuna had caught him crying in the kitchen at 2 am, wondering what the hell was so wrong with him that made that made it so hard for his dad to love him. Sukuna had grabbed the secret stash of Oreos he’d had hidden under the sink and offered them to Megumi and told him “Dads are just dicks sometimes. Nothing wrong with you babe, you’re perfect.” He’d said it so many times, so casually, like he had no clue that each time, with each compliment, each smile and passing glance in Megumi’s direction, he’d burrowed a little deeper into Megumi’s heart, securing his place there forever as number one crush, first and worst. 

“So,” Sukuna is saying to Yuuji, gesturing between Megumi’s legs like he’s a diagram drawn out on a chalkboard, “you can’t just go straight in for the bullseye, it’s too much of a shock. It won’t feel good for him. You have to start slow. Get him to relax before you try to work him up.” 

He gently pries Megumi’s legs apart again, this time running both hands up his thighs, slowly. When he reaches the edges of Megumi’s underwear, he skips past the most sensitive area and squeezes around the sides at Megumi’s hips, then around his waist, pushing his shirt up over his belly button. Once he reaches the bottom of his rib cage, Sukuna slides his hands back down the way they came, on the insides of his thighs. He pushes them apart even more, and Megumi feels like a butterfly pinned to a board, completely on display, his breath speeding up as Sukuna’s thumbs run along the sensitive skin where thighs meet groin, just outside of his panties, not dipping underneath, but just tracing along the seams.

“Nothing too fast or too intense, just get him used to being touched.” 

Megumi’s brain goes completely fuzzy as gradually, Sukuna’s thumbs start brushing up under the cloth on either side, and gently tugging on the plump skin underneath. His movements are spreading the outer edges of Megumi’s lips apart, then pushing them back together, just subtly like he might not be doing it on purpose, but it’s enough to drive Megumi crazy. He can already feel wetness gathering between the folds of his pussy. He wants Sukuna to touch him there again, but he keeps teasing the sides, keeps pulling and pushing the delicate skin until Megumi is so wet he can feel his panties clinging to his slit. He hopes the dark color of the cloth hides what must be a rapidly spreading stain.

“You see how he’s starting to squirm a little? That’s good. Means he wants more.”

Without warning, Sukuna pulls Megumi’s panties off completely, then rearranges his body like he’s a mannequin, laying him sideways across the bed. Megumi’s now-bare bottom half is over Sukuna’s lap, legs splayed apart and his cunt on full display facing out toward Yuuji (who Megumi keeps forgetting is there, watching all of this). His naked ass is pressing against Sukuna’s clothed dick, and from what Megumi can tell, it’s at least half hard. He has no idea what to do with that information.

Sukuna slides his huge, warm hands everywhere, over his stomach, his thighs, between his legs. Megumi gasps as he brushes lightly over his pussy with the backs of his fingers, and he hears Sukuna’s low chuckle. 

“Now look,” he says, and gently brushes over it again. Megumi’s hips move without his permission, desperately trying to meet the touch, greedy for more contact. “Now is when you can touch him here, when his body starts begging you for it.”

He pets over it again a few times before forming his fingers into a V at the top of his slit, spreading it apart to show off what’s hidden between his lips. Megumi isn’t looking at Yuuji but he hears a quiet “Woah” from where he’s sitting. 

Sukuna laughs at the reaction. “Yeah, he’s pretty huh?” He moves his fingers around gently, looking down and assessing the sight. “Goddamn, Megumi, it’s not enough your face is gorgeous? You had to have a perfect pussy too?” 

Megumi’s face burns, and he holds back a whine, his heart overloaded from the praise. He’s been called pretty plenty of times before, but it’s usually hurled at him like an insult, a cutting “pretty boy” from meatheads and wannabe thugs over the years throughout middle and high school. It barely warrants an eye roll from Megumi anymore when it comes from anyone else, but from Sukuna, spoken genuinely in that deep, rich voice that makes his insides shiver, it’s instantly addictive. He wants to hear it again.

“See how wet he is now?” Sukuna asks, speaking to Yuuji again, and starts touching there carefully, this time letting his middle finger dip in between the folds. “You can use spit or lube if you’re in a hurry but if you work him up right, he’ll get there on his own.”

He pulls gently to one side, opening him up again. “And in here, where it’s all pink like this, don’t ever touch here unless it’s wet enough to just kinda slide around,” he narrates as his fingers do exactly that. 

Megumi can’t help letting out a soft moan, and promptly bites his lip to try to stop more from escaping. 

He’s more embarrassed than he’s ever been in his life, being put on display like this, treated like a doll, a learning aid in a perverted anatomy class, but he’s never been this turned on before either. He’s so wet he can feel the slick dripping down over his perineum. Sukuna must see it too, because he catches it with the index finger of his free hand, the one not busy spreading him open. He uses the wetness to glide back up into Megumi’s folds. Megumi groans and bites his lip harder.

“Uhh so…” Sukuna falters for just a moment, as if he forgot what he was about to say, then clears his throat. “Right, uh, so, if I pull back from the top on this little hood right here, see that? That’s the clit. I’m not actually gonna touch it directly, cause he’s crazy sensitive, it’d be too much for him. I’m just gonna rub down over the hood this way,” he says, demonstrating. 

“Ohhhhh,” Megumi moans loudly as Sukuna’s fingers slide down. 

“Holy shit,” he hears Yuuji say, more to himself than to either of them. Fuck, he really does somehow keep forgetting Yuuji is there. 

He stifles the sounds, and props himself up on his elbows, just trying to get a view of the room so that maybe he can keep himself under control a bit better, but it backfires. He ends up witnessing the almost matching expressions on both brothers’ faces as they stare at his pussy like it’s the eighth wonder of the world. Somehow all the embarrassment he feels is mixing together with this strange sense of power he suddenly seems to have over them, the clashing emotions making him feel even more overwhelmed, like a raw nerve.

Sukuna catches him looking and grins smugly. Megumi can’t do anything but pant and gasp as his body is played with so expertly. “You’re close already, huh baby?” Sukuna croons, sliding two fingers down to his entrance, through the slick that’s been gathering there, about to drip down again, slowly back up on either side of his clit, then circling at the hood right over that most sensitive bundle of nerves, repeating the movement until he’s dizzy from the pleasure. 

Megumi hates that he’s right, hates how easy it was for Sukuna to get him so close to the edge. He’s barely keeping it together, and it’s not helping any that now Sukuna won’t shut up, keeps murmuring praises and dirty things to him, things like, “Knew you’d get so wet for me,” and “So pretty down here, fuck, you got pretty everywhere.”

Megumi’s breathing is so fast and shallow, he’s scared he might actually pass out, but Sukuna keeps petting him, keeps rubbing those relentless circles into him, that perfect pressure, picking up speed, not too fast but just enough, until he’s right at the edge, and Sukuna’s saying “Come on sweetheart, I know you’re right there, c’mon baby,” and Megumi stiffens and as he reaches his peak, his back arching, head tipping back, calling out “Ahhh, god, fuck!” as his pussy throbs with pleasure. “Ahh!” The feeling ripples through him until he’s shuddering, hands gripping the sheets and Sukuna’s shirt til his knuckles turn white. He’s had orgasms before (alone, of course), but never has it felt this intense.

Sukuna’s hand doesn’t still completely, just slows down as he repositions it, using four fingers now to cover the outside of Megumi’s pussy completely, a firm and comforting pressure as he brings him down from the high of his orgasm. 

“That’s what it sounds like when he actually likes it,” Sukuna says mirthfully. “Do we hear the difference?”

Morbidly curious, Megumi peeks over his own heaving chest to see Yuuji’s reaction, but his best friend remains speechless. He’s slack-jawed and glassy-eyed, and there's an obvious tent in his pants. He’s still staring at the place between Megumi’s legs like it holds the secrets to the universe, even though Sukuna’s hand is now hiding the best part of the view. 

Megumi lets his head fall back onto the mattress, and his legs fall closed across Sukuna’s lap, more relaxed than he’s been all night. He’s pretty sure that Sukuna is about to get up and leave the room now that this bizarre lesson is over, leaving Megumi alone with Yuuji to have possibly the most awkward moment they have ever experienced in their nearly decade-long friendship, but that’s a problem for future-Megumi. Present-Megumi is too satisfied and boneless to care.

Absently, he’s aware of the hard length still pressing into his backside. From feel alone, it seems enormous. It should be rather terrifying, or at the very least intimidating, but Sukuna isn’t rubbing it against him, and in fact he does nothing at all to acknowledge its presence. Instead, with his left hand, he squeezes lightly on the bit of flesh at Megumi’s hipbone, massaging there pleasantly until Megumi’s breathing is under control. It’s… nice.

“Once you give him a minute, and he catches his breath—“ Sukuna cuts himself off, “Legs, you good?”

It takes a moment for Megumi’s brain to finish buffering and realize he’s been asked a question. He props himself up with his elbows again, sitting up as much as he can in his current position, then nods, and manages a quiet, “Mmm-hmm.”

Sukuna smiles slyly and hums his agreement. “Yeah I’ll bet.” With his right hand still holding Megumi between the legs, he curls his fingers almost imperceptibly, and the gentle unexpected squeeze makes Megumi gasp. He holds their eye contact for a few extra beats before turning back to Yuuji. “So once he catches his breath, he’ll be relaxed enough to take it a little further.”

Megumi’s eyebrows fly up to his hairline. 

“F-further?” Yuuji asks, his voice cracking. 

“Of course,” Sukuna says. “You think you can just make him come once and then, what? You’re done?” He narrows his eyes at his brother. “Or you think you should get to fuck him now?”

Yuuji sputters a bit, but no actual words come out. 

“In your dreams, brat. You have to earn it. Besides,” Sukuna drawls, glancing down at the prize in his lap, “getting your dick in isn’t the point. All you should give a shit about is making him feel good, that’s the only goal. And if it isn’t, then you don’t deserve to touch him at all.”

The pounding of Megumi’s heart in his chest at Sukuna’s words somehow feels even harder and stronger now than it did before. It was bad enough when he called Megumi pretty, but this feels… bigger. In his head, he knows Sukuna is speaking in hypotheticals, about general coupling etiquette, advice any older brother worth his salt would give to a younger brother. But still, the way he said it makes a tiny part of Megumi feel like Sukuna might care about him. Like he might actually be special, in Sukuna’s eyes. Worth treating right. 

It’s stupid, wishful thinking. He bites down on the inside of his cheek, trying to bury the feeling.

Meanwhile, Sukuna’s running his hands up Megumi’s thighs again, and positioning his body again the way he wants it. This time, he bends Megumi’s knees and pushes them together and up toward his chest, folding him nearly in half, but not so far that it’s uncomfortable. “Anyway, after you’ve made him come once, he should be relaxed enough you can get inside and make him do it again.”

Megumi feels one large, pleasantly calloused hand spread across the back of his thigh, holding him still, but it’s not until he feels fingers lightly circling around his entrance that he processes the word “inside.”

“He’s already plenty wet from before,” Sukuna is saying, letting the tip of his middle finger slip down, “but you still have to be careful; he’s a virgin so don’t go too deep.” 

Megumi tenses as he feels Sukuna’s finger slide just the tiniest bit inside him, barely a centimeter. He’s never had anything inside him before, he doesn’t even like to use tampons. When he touches himself, he usually avoids using his fingers at all, preferring to shove a pillow between his legs, or sometimes the oversized stuffed rabbit Gojo bought for him ages ago. It's usually enough to get him off without overstimulating him, like his own fingers sometimes do.

“Breathe angel,” Sukuna says in a low voice, soothing with his other hand along from Megumi’s thigh to where it meets the flesh of his ass cheek. “Relax for me, yeah?”

It’s scary, the thought of letting anything in, but it doesn’t feel bad like it did when Yuuji tried. He trusts Sukuna with this, and doesn’t want him to stop. Megumi lets out the breath he was holding. When he inhales again, Sukuna pushes his finger in a little further, then eases back out a bit, then in again, repeating slowly, working his way toward the first knuckle. “Fuck, that’s tight,” he mutters, seemingly just to himself. 

It’s a different sort of sensation than before, less frantic, but no less intense. Megumi closes his eyes and lets his head tip back, luxuriating in the feeling. 

“Don’t push too deep, and don’t pull out too far either, you don’t need to do too much yet, he can feel every little shift, so less is more.” Sukuna pauses, and Megumi’s eyes pop open when he feels a purposeful twitch from the thick, hard rod still pressed against his lower back. 

“Well, sometimes,” Sukuna says, his dark eyes flicking down and meeting Megumi’s. He smirks playfully. “Not always.”

Another twitch.

Megumi almost laughs at the absurdity of Sukuna trying to brag about the size of his dick while he can barely get a finger into his cunt, but it comes out as another gasp as Sukuna slides the pad of his thumb up to trace along the top of his opening. At the same time, he curls the finger that’s inside, just deep enough to press at a spot inside him that feels incredible

“Aaah!” 

“Right there?” Sukuna asks, as though there’s any doubt when he presses his finger there again and has Megumi panting. 

Megumi nods, his eyelids fluttering, and he can feel himself get even wetter, Sukuna’s thumb gliding up to his clit and circling around it.

“God, your body’s fucking perfect, so responsive, it’s crazy,” Sukuna tells him in a low voice, sounding slightly out of breath himself. 

After a few moments, he uses his free hand to guide Megumi’s leg up, hooking his knee over Sukuna’s shoulder. He pushes Megumi’s other knee to point outward, so Megumi is spread wide, even wider than before. While he’s plenty flexible, it’s a bit harder for him to sit up on his elbows with his leg up like this, so he lets himself relax back onto the mattress. 

Once Sukuna has him positioned how he wants, he slowly pulls his finger out completely, and Megumi whines at the loss. He’s past the embarrassment, at least for the most part, and he just desperately wants Sukuna to keep going. Without skipping a beat, he pushes back in again, this time with his middle and ring fingers together, pushing into that same amazing spot, thumb tracing along the place where they’re joined.

“Haahh!” Megumi cries out at the stretch. It’s not painful like he thought it would be, he’s so wet that Sukuna’s fingers have no trouble at all sinking in deeper. He just feels beautifully full, the walls of his cunt gripping onto Sukuna’s fingers.

“Not too fast, take your time with it,” Sukuna says, his gaze locked onto Megumi. Even though he’s technically speaking to Yuuji, it’s like he’s barely acknowledging him. Like there’s no one but the two of them in the room. Megumi catches himself wishing it were true, wishing they were alone. He wonders what else Sukuna would say, or do. He wonders if Sukuna would kiss him.

“See how he can’t help moving faster? Cause he wants to come again, but you gotta drag it out, just keep building it up.” 

In his haze of arousal, Megumi hadn’t noticed his hips rolling, desperate little thrusts trying to spur on Sukuna’s movements. 

“The more you build it up, the prettier he’ll fall apart for you.”

Sukuna keeps teasing inside him, speeding up for a few seconds, then slowing again, driving Megumi absolutely insane. He’s never felt so out of it, his toes start to tingle, and his hips roll upward again as even more slick gushes around Sukuna’s fingers.

“Fuck,” Sukuna groans. “Wettest pussy I ever felt in my life, so fucking hot.” 

Megumi feels another twitch from Sukuna’s cock at his backside, but he doesn’t think it’s on purpose this time. The fact that Sukuna is affected by watching him, by touching him, turns him on even more. He feels like he’s right on the edge, but still, Sukuna keeps the maddening slow pace of his stroking and rubbing. Megumi wants to scream.

Tears begin to form at the corners of his eyes. He locks eyes with Sukuna. “Please,” he whispers.

Sukuna licks his lips, looking at Megumi like he wants to devour him. Like he’s starving. “You want it bad, huh baby?” 

Megumi nods frantically. He doesn’t care about anything else in this moment, his universe consists only of Sukuna. The sound of his voice, and the look in his eyes, and the way he’s touching him.

“Yeah, me too,” Sukuna mutters, and slides his free hand under Megumi’s ass, lifting it up, shifting his own body around and leaning down, his face suddenly so close to Megumi’s pussy that Megumi can feel his breath. He wastes no time, licking over the wet folds, up around the clit and back down to where his fingers are still clutched tightly inside. 

“Hey- what the fuck?” Yuuji’s voice attempts to break through the cloud Megumi’s floating on right now, but Megumi barely hears it, his own desperate cries drowning it out.

“Mmmnn, fuck, please,” he babbles, unable to stop himself. He can feel Sukuna’s mouth pause and form a grin against him. “God, don’t- ah! Don’t stop! Sukuna, please-“

Sukuna obliges, that wicked tongue sliding around while his fingers finally move a little faster, petting inside him. Megumi had never imagined how amazing a mouth could feel, the onslaught of pleasure washing over him, his cunt clenching around Sukuna’s fingers, Sukuna licking softly through his folds.

He can feel his orgasm rapidly approaching, and he dares to reach down and thread his fingers through Sukuna’s hair. It’s softer than he imagined. Sukuna’s lips pillow and close around Megumi’s clit, and he feels a gentle sucking, at the same time as his fingers press up harder into that spot inside him that still feels so good. It sends him over the edge, orgasm rocketing through him, his pussy pulsating and throbbing. Megumi lets out a sob, his fingers tightening their grip in Sukuna’s hair, pulling it. Sukuna grins again, lapping up the juices of Megumi’s release.

Megumi’s whole body is trembling, and Sukuna soothes him through it like before, finally pulling his fingers out of the death grip they’ve been locked in. He presses one last kiss to Megumi’s lower lips, lingering there for a few extra moments. Megumi’s heart swells, wishing again that Sukuna would kiss him for real. 

Megumi untangles his fingers from Sukuna’s hair, and they lock eyes for a moment as Sukuna lowers him back down. 

He retrieves the panties from the corner of the bed, and guides Megumi’s feet through them, pulling them up, back into place. The crotch is still wet.

Sukuna adjusts himself in his sweatpants as he stands, the outline of his dick clear as day against his thigh. “Thanks for coming to my TED talk,” he says, smirking, and he’s on his way toward the door. He pats Yuuji on the shoulder.

“Fuck you, that was so messed up,” Yuuji mumbles, shrugging Sukuna’s hand off. 

“Aw, don’t be like that,” Sukuna chuckles. “You should be thanking me.”

Yuuji stands to face him. He had a late growth spurt this year, gaining him a few extra inches of height, but Sukuna still has three or four inches on him. He doesn’t let that stop him from crowding into his brother’s space. “You took it too far, like you always do with him.”

Megumi has no idea what he means by that.

Sukuna’s eyes narrow. “Maybe you missed the part where he was begging me for more,” he says cruelly. “Besides, you obviously enjoyed the show.” He gestures downward with his chin toward Yuuji’s pants, which are no longer tented, but now sport a rather unfortunate stain. 

Now that the blissful haze has cleared a bit, Megumi’s embarrassment has returned with a vengeance, his cheeks burning. He stands up on baby deer legs, wobbling quite a lot after barely recovering from the two most intense orgasms of his life, one right after the other. He grabs his shorts from the floor but doesn’t bother trying to put them back on, and squeezes in between the two brothers, interrupting their little face-off. 

“I’m gonna just, take a shower,” he says, facing toward Yuuji but not meeting his eye. 

He pushes past them to the door, forcing them apart. Yuuji’s still frowning as he retreats across the room to straighten up the ruined sheets and covers on his bed. As Megumi opens the door to leave for the bathroom, Sukuna reaches out from behind him and touches Megumi’s waist with the tips of his fingers. Megumi freezes.

Sukuna leans down close and purrs in his ear. “I’m right next door if there’s anything you need.” 

Megumi suppresses a full-body shiver as Sukuna’s hand ghosts around the side of his waist to his belly button. He steps through the doorway, turning to face Megumi in the process. He’s staring at Megumi’s mouth with that same hunger in his eyes from before, when he couldn’t stop himself from stealing a taste.

“Anything at all,” he says in that low, gravelly voice, and lets his fingers trail down to Megumi’s panties, hooking them in the elastic band. He tugs gently, then lets go, and Megumi startles as the elastic snaps back into place. Sukuna smiles mischievously as he heads down the hall and back into his own room.

Megumi watches him go.