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carmenlire · 2 months

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Semantic Error Omegaverse AU

Been back on my Semantic Error bullshit the past week and I can NOT stop thinking about how perfectly these two would fit an omegaverse au like i'm obsessed!! Jaeyoung is obviously an alpha, however, a lot of people assume that Sangwoo is a beta but he is, in fact, an omega! So enjoy 4.5k words of me describing in excruciating detail what I would write if I wrote this fic <3

I can't decide between making this a world where everyone wears scent blockers/is on suppressants or letting Jaeyoung know immediately that Sangwoo's an omega (because betas don't have to wear scent blockers so wearing them would be a dead giveaway but I could make the sleight of hand work with suppressants HOWEVER I think a core part of this au would be that people who look at Sangwoo see a cold, driven man and just assume he's a beta).

Obviously, I would make this au deliciously tropey and fit in ALL of That Good Shit but I am very taken with the idea/exploration that Sangwoo actually enjoys being an omega. I think masking his subgender would be useful to him but when it's just him or his friends/family, he is very comfortable with who he is-- he obviously does not believe in any of the stereotypes/misconceptions that paint omegas as inferior or needing protecting or only good for one thing or whatever cliche you wanna throw in there.

Alright, we'll say unmated people are expected to be on suppressants so that solves that issue-- this comes with the caveat that omegas/alphas still have two cycles a year in order to keep everything properly maintained (compared to idk the regular 4 cycles a year). I'll hc that it's like a daily pill and it wears off toward the end of the day and that's when individuals may choose scent blockers if they're going to be out longer but obviously in this au, like going to a club with a scent on display would be like The Whole Point in trying to attract someone so i'll digress.

ANYWAY like I said, Sangwoo is very driven and still comes off as very cold so most people assume he's a beta. That suits Sangwoo just fine. He's in no mood for romance and finds alphas fucking insufferable-- always posturing, acting like they're god's gift to the world (to omegas specifically) and he doesn't have time for distractions. however, and I personally think this is important to tie his personality into this AU– he actively enjoys being an omega.

His parents knew before he presented that he’d be an omega– he enjoyed nesting with his father and if he cares about someone, has a habit of doting on them. Sangwoo knows and values the importance of biology right so it fits that when he does have free time, then he indulges shamelessly in his nature. So, for this AU, I love to think that his bed is a very warm and inviting nest, that he enjoys baking (like I’ve written in previous fics, it fits his analytical mind AND he was a sweet tooth and for this, it’s a way he cares for people).

And while he’s never had a partner for his heats, Sangwoo does enjoy them. With an acknowledgement that this could get a little messy re: subgenders/biology, this is first and foremost a pure fluff fic and so–

I think heats, particularly for this verse, can be both sexual (need to procreate) and simply biological (need to bond with mate). Again in keeping with the show, Sangwoo puts an abundance of meaning on biology. So while he doesn’t have a mate to bond or produce offspring with during his heats as an unmated omega, there’s still something about them that is deeply meaningful to him.

I hc that they’re less sexual for him (until Jaeyoung lol) and serves as more of an opportunity to connect with his own inner omega. He spends a few days every six months resting in his nest– or broadly, his apartment, where he allows himself to not think about homework or anything. It’s just him being. He bakes, sleeps, watches tv, reads… it makes him feel incredibly centered. And yes, he does own a knotting toy and it is ONLY during his heats that he begrudgingly admits that maybe alphas do have a use after all lmao.

To bring Jaeyoung into it and get this AU started properly, Jaeyoung figures Sangwoo’s a beta– though, the instant before Sangwoo opens his mouth and flays him alive, Jaeyoung does have the thought that Sangwoo has to be an omega– small (much smaller than Jaeyoung at least even if he’s a tall omega), beautiful, and there’s just something about him that compels Jaeyoung.

Of course, after that first conversation, Jaeyoung is compelled by Sangwoo, alright– to be an absolute menace and get his revenge. Lol.

The two get closer, following canon, and Jaeyoung doesn’t realize that Sangwoo is actually an omega until after he saves him from the Quickst asshole. In this AU, Sangwoo wanted to leave because the guy was being a dick, yes, but also because he was well aware that it was getting late and his suppressants were about to wear off– hence, his scent would start to escape.

He refuses to admit that Jaeyoung stepping in kinda make his omega preen– they’re in tune but Sangwoo still thinks that his omega can be a bit baffling (though, he’s only started to really think so since Jaeyoung stepped into the picture).

That’s also mostly the reason Sangwoo doesn’t want to let Jaeyoung into his apartment. He doesn’t let people into his apartment because he’s private yes but also because he knows his scent is undeniable. Still, he’s not an asshole (and, both he and his omega trust Jaeyoung for…. Some reason) so he does end up letting him in.

Jaeyoung is immediately overwhelmed as soon as he steps inside Sangwoo’s apartment. He’d thought, for a minute when he grabbed Sangwoo’s hand and dragged him out of the bar, that he’d caught the faintest edge of a mouthwatering scent but he’d been preoccupied. It becomes glaringly obvious now, though, that it was Sangwoo. That vague scent from the bar is nothing compared the rich, overwhelming scent he’s confronted with now.

If I lean into the trope, I guess I’d make it something that could be sharp– citrus, maybe, that can be sour and sharp but turns sweet and soft when Sangwoo is comfortable. I think that would fit his personality. For Jaeyoung, definitely something earthy, complimentary to citrus– though I’m not sure what that would necessarily be lmao.

Anyway, Jaeyoung is reeling but Sangwoo is business as usual though Jaeyoung swears he sees the shell of his ear turning red. Jaeyoung is a gentleman, though, despite how he’s acted with Sangwoo and he doesn’t comment on the scent (it would be declasse and Sangwoo is actually helping him, he’s let Jaeyoung in and– especially now that he knows he’s an omega– it’s an incredibly meaningful gesture that Jaeyoung and his alpha appreciate).

He doesn’t bring it up until Sangwoo is tending to the cut on his arm and this is the conversation that turns the tide. Jaeyoung is tentative but undeniably curious, asking Sangwoo why he hides his subgender, letting everyone assume he’s a beta. Jaeyoung is surprised, yet again, when Sangwoo matter-of-factly tells him that he doesn’t hate his subgender, actually enjoys it. It isn’t an inconvenience or whatever. It’s something Sangwoo likes about himself.

They’re both stripped down in the quiet of Sangwoo’s living room and come closer to reaching that middle ground. Through it all, Jaeyoung can’t stop thinking about how delicious Sangwoo’s scent is and how he was right to make that long ago guess. It’s so obvious, especially now that Sangwoo isn’t wearing a hat– his lush mouth, delicate features, making it so clear.

Jaeyoung had a red hoodie and leaves it at Sangwoo’s that night. He might not realize it at the time but it’s, obviously, his alpha’s way of staking a claim on Sangwoo, placing his scent in the omega’s space.

Jaeyoung figures Sangwoo will return it to him the next day and forgets about it when he doesn’t.

Sangwoo for his part, closes the door behind Jaeyoung when Yuna calls and slumps against it. It was so late and Jaeyoung’s own suppressants had started wearing off. Sangwoo had never cared for alpha scents, despite supposed biological compatibility– they were too aggressive, altogether unpleasant and stinging in his nose.

Jaeyoung’s, however, was different. It wasn’t dark or musky but something lush, deep with just a hint of sweetness that made Sangwoo inexplicably want to bury his nose in Jaeyoung’s neck to tease it out further, until it was all he could smell, surrounding him.

He’d expected Jaeyoung to be an ass about finding out he was an omega. While Sangwoo didn’t hide it, he let people make their assumptions. Jaeyoung had surprised him, though.

When Sangwoo finally straightens, his eyes immediately lock on the red hoodie laying over the arm of his couch. He frowns deeply, glaring at it. He should return it to Jaeyoung tomorrow.

He doesn’t.

And a few weeks later, when Sangwoo’s preheat starts, he’s heading out the door when his gaze snags on the hoodie, still in the exact same spot. It’s Thursday and he’s glad that his heat won’t disrupt his classes this time around. Thanking the fact that he always has a buffer in his schedule, Sangwoo reaches out for the hoodie and raises it to his nose. Jaeyoung’s scent isn’t nearly as present as it was that night but it’s still detectable when he buries his face in it. Something in him calms, preens a little at the scent of an alpha who Sangwoo can admit he… doesn’t quite despise.

It is fall, the morning chilly, Sangwoo rationalizes as he takes his backpack off to put the hoodie on. Plus, Jaeyoung had told him just yesterday that, unfortunately, he had a meeting with an advisor and wouldn’t be able to annoy him today, so there’s no chance that Jaeyoung will find out that Sangwoo is wearing this monstrosity of a hoodie.

As soon as he slips it on, Sangwoo finds himself letting out the quietest purr. It’s oversized, hanging down to mid-thigh, and feels like it’s wrapping him in pure warmth. Lifting the hood to cover his hair, Sangwoo feels content, like going to class during preheat won’t be so miserable after all (for all he enjoys being an omega, it is sometimes inconvenient– like when he’s just in preheat, hoodie able to hide the scent blockers, and has to go to class because there’s a quiz).

It’s just his luck that he leaves class, hoodie still over his head, to run into a wall– that turns out to be Jang Jaeyoung. Startled, Sangwoo’s head whips up and he immediately stills at the look in Jaeyoung’s eyes.

Jaeyoung, for his part, wrapped his meeting up earlier than expected and found himself on the way to meet Sangwoo almost subconsciously. If he thought his need to bother Sangwoo was bad before he found out he was an omega, it’s been downright awful now that he knows. Jaeyoung finds himself seeking Sangwoo out even more often, anytime he has a free moment and knows where Sangwoo is. Yuna calls him a whipped alpha and Jaeyoung can’t even defend himself. Now, seeing Sangwoo in his glaringly red hoodie– seeing an omega he can’t stop thinking about in his hoodie– Jaeyoung’s alpha wants nothing more than to press Sangwoo against the wall and scent him, cover him completely so that no one can see how cute Sangwoo looks while at the same time wanting to preen that Sangwoo deigned to wear something of his in public, at all really.

Sangwoo stiffly replies that he wore it because it was cold this morning and it was sitting right there on the couch. Jaeyoung has his Sangwoo Smile on his face, the one that’s so wide it has to hurt, eyes crinkled in pure delight. They’ve grown closer the past few weeks, guards/defenses inching down, and so Jaeyoung warns Sangwoo, ��I’m going to touch you now,” and lays a surprisingly gentle arm over Sangwoo’s shoulders.

To his surprise, Sangwoo doesn’t shake him off. Instead, he leans into Jaeyoung’s warmth– just a little but Jaeyoung, of course, notices. Something in him growls, protectively, happily, at the action.

Sangwoo doesn’t notice the stares as he and Jaeyoung make their way across campus. He knows he aced his quiz but a headache is building behind his eyes, a dull ache starting up in his middle. Typical preheat symptoms but still annoying. It’s cloudy, wind chilly, and he shivers deeper into Jaeyoung’s side, sleeves covering his hands and arms wrapped around his middle.

Jaeyoung looks down, frowning. Sangwoo looks even smaller like this and it’s adorable but unlike him. Looking closer, he sees a flush on Sangwoo’s cheeks.

“Sangwoo,” he asks, “Are you feeling okay?”

Sangwoo shrugs and explains matter-of-factly that his preheat has started.

Jaeyoung’s eyes widen though Sangwoo doesn’t see his reaction.

Jaeyoung isn’t sure what he’s feeling– there’s surprise, that Sangwoo just admitted his heat was right around the corner. He doesn’t know why, but Jaeyoung thought he’d be shy about it. There’s his baser reaction which he isn’t necessarily proud of but can admit, at least to himself– he has the immediate desire to be Sangwoo’s heat partner. Jaeyoung has a need to see what Sangwoo is like during his heat– is he as demanding as he is regularly or does it turn into neediness, edges softened?

Jaeyoung would like whatever way Sangwoo acts during his heat, he knows, but his curiosity is suddenly ignited like a wildfire. And yes, there’s the sudden visions of Sangwoo under him, eyes blurred with want.

But Jaeyoung’s also driven with a need to protect, to care for– and it’s this that he acts on. He steers Sangwoo off campus after asking when his heat will hit in earnest and Sangwoo replying the morning. It’s lunchtime now and Jaeyoung takes Sangwoo to a nearby restaurant.

Sangwoo doesn’t display his usual stubbornness, prickly exterior melting into something more agreeable as he seems willing enough to let Jaeyoung lead the way. It’s a nice change of pace, Jaeyoung can admit, but he knows he’d miss Sangwoo’s mulishness if this was how it always was lol.

They sit at a small table in the corner and Jaeyoung knows the ahjumma who runs the place. She coos over Sangwoo and Jaeyoung’s surprised, again, when Sangwoo lets her.

She returns with hearty portions and teases them both– something about Jaeyoung finding the cutest omega in Seoul or telling Sangwoo that if Jaeyoung proves to be a useless alpha to let her know and she’ll straighten him up.

The food is hot and smells delicious and Jaeyoung doesn’t even think before he reaches for the first mandu and lifts it up to Sangwoo’s mouth. Sangwoo, for his part, does spare a moment to think about shoving Jaeyoung away.

He rolls his eyes internally, thinks of Jaeyoung as an overzealous alpha– just because he knows he’s in preheat doesn’t mean he has to feed him what is this, the joseon era– but Sangwoo’s omega is closer to the surface than usual and all he really feels after a pinprick of annoyance is warmth. He feels a little miserable and he trusts this alpha– like him too, he can admit to himself if not aloud yet– and he accepts the bite of food from Jaeyoung’s chopsticks.

Jaeyoung’s lips part in surprise at Sangwoo’s easy acquiescence. His alpha and him watch Sangwoo chew carefully, pride and satisfaction in his eyes. The meal continues like that– Jaeyoung feeding Sangwoo the best pieces of chicken, the crispest bites of vegetables– until Sangwoo finally waves him away, full.

Jaeyoung swiftly finishes the meal off and it’s only when the check comes that a hint of Sangwoo’s usual snappishness reappears. He insists on paying, then at least paying half, but Jaeyoung doesn’t have any of it.

Sangwoo rolls his eyes at Jaeyoung being an annoying alpha but Jaeyoung doesn’t pay it any attention, just returning his arm to where it was resting over Sangwoo’s shoulders as he guides them out of the restaurant with a cheery wave to the ahjumma.

They makes small talk on the way back to their apartment building about a new movie or the upcoming deadline for Veggie Venturer. Sangwoo doesn’t even notice until they’re at his door that Jaeyoung had carried his backpack from the restaurant.

At Sangwoo’s door, Jaeyoung finds it even more difficult than usual to turn to his own door and leave Sangwoo. Sangwoo’s leaning against his door and Jaeyoung stands just in front of him.

They watch each other for a moment and Sangwoo has an urge to ask Jaeyoung something but it’s foolish, too much he knows. But still he wants it and so does his omega. His usual defenses are softened by preheat and by Jang Jaeyoung. He’s already learned that’s a devastating combination.

“Hyung,” he asks voice quiet and unsure.

Jaeyoung hums, eyes flitting from the fullness of Jaeyoung’s cheeks, to the way his hoodie sleeves completely cover Sangwoo’s hands. It’s too soon, Jaeyoung thinks, to look at Sangwoo and see him as mine.

“Will you scent me?”

That was not what Jaeyoung was expecting and his gaze snaps up to meet Sangwoo’s even as his alpha preens.

It’s not even a question and Jaeyoung hates the way Sangwoo’s gaze is shadowed with uncertainty, a hint of insecurity. It’s the first time he’s ever seen that look on Sangwoo and he never wants to see it again– displeased that it’s this question that would bring it out, like Jaeyoung wouldn’t love to, like he isn’t fighting the urge to immediately bury his face in Sangwoo’s neck.

He leans down and watches enraptured as the flush on Sangwoo’s cheek grows deeper. “Are you sure, Sangwoo? If this is the preheat talking, if you wouldn’t ask otherwise–”

“I’m sure,” comes Sangwoo’s voice, quiet but sure. He bites his lip, looking away. “I don’t know what it’s like for other omegas but I don’t– I’m still in possession of all my faculties. I wouldn’t ask if I didn’t want it.”

Jaeyoung is still for a moment before exhaling. He smiles, something softer than his usual smirking grin. “Then I’d love to, Sangwoo-ah.”

He goes to lean down just to be stopped by Sangwoo’s hand on his chest. Confused, Sangwoo just shakes his head and gestures to his door. “Not out here, hyung. It isn’t decent.”

Jaeyoung’s nodding along distractedly before the words catch up and he steels himself.

Because seeing a Sangwoo in preheat is a lot. Being asked to scent Sangwoo makes his head spin. But getting to scent Sangwoo in Sangwoo’s apartment– did he mention he’s in preheat? Omegas are notoriously protective of their spaces when they’re in heat and Jaeyoung knows the simple fact of Sangwoo asking him to scent him should have been clue enough but Sangwoo inviting him in, sends his heart skyrocketing.

As soon as the door opens, Jaeyoung inhales sharply. It isn’t overwhelming but it’s present– Sangwoo’s scent is deeper. Nothing like it will be during actual heat but the hint is there, something headier in the usual mouthwatering scent that Jaeyoung has only caught once.

Sangwoo closes the door, leaning against it again, this time inside the apartment. He peels the scent blocker off with little fuss, stuffing it in his pocket. He then reaches out, wraps careful fingers in the soft material of Jaeyoung’s sweater and pulls him closer, gently, like he’s afraid Jaeyoung doesn’t really want to come.

How preposterous, Jaeyoung thinks.

Before he can even open his mouth, Sangwoo is offering, “You can touch me, hyung,” and Jaeyoung spares a moment to wonder how he’s going to survive this.

Slowly, Jaeyoung wraps an arm low around Sangwoo’s back, stepping closer. He leans down and Sangwoo’s scent makes him dizzy already. It’s sweet, calm, and Jaeyoung has the overwhelming need to let it soak into him, wants to cover it with his own scent and see how they mingle. It’s made all the better by the fact that Sangwoo clearly wants this, too, that he asked Jaeyoung for his scent– that he wants Jaeyoung’s scent on him, at all but during his heat.

He can’t help the quiet grumble as his nose makes contact with Sangwoo’s neck. He takes his time, carefully presses against Sangwoo’s scent gland, and thanks to how close they are, Jaeyoung can feel Sangwoo melt into him.

Sangwoo tilts his neck to give him easier access and Jaeyoung lets loose a little more, touch firming up, incessant. He can smell the way his own scent intertwines with Sangwoo’s– something fresh and bright.

It takes him a moment to clue in but Sangwoo’s started purring, a hand lifted into Jaeyoung hair to keep him in place like Jaeyoung would want to be anywhere except right here, mind clouding over with Sangwoo’s scent.

They lose track of time but eventually Jaeyoung pulls back, dazed, just to see Sangwoo looking like he’s about to melt into the floor, pliant and soft.

“Thank you, hyung.”

Jaeyoung’s voice is low, hoarse. “Anytime, Sangwoo.”

Jaeyoung leaves just a few minutes later, taken aback but not at all unhappy when Sangwoo suddenly calls out and darts up to kiss his cheek before slamming the door in his face.

The weekend is torturous knowing Sangwoo’s in heat on the other side of the wall they share. He leaves food for him outside and tries to focus on a project he’s working on with Yuna.

It’s early the next week before he sees Sangwoo, who comes bearing a tray of brownies he made to thank Jaeyoung. And Jaeyoung doesn’t know it yet but Sangwoo baked them at the tail-end of his heat, still clearheaded but mind a little gooey at the edges. His focus at the time– the entire duration of his heat, really– had been Jaeyoung. He’d wanted to give Jaeyoung something, made with his own hands. He watches, more anxious than he lets on, as Jaeyoung’s obviously delighted by the unexpected treat. He immediately tries one and moans at how good it is, his usual goofball self. Sangwoo scoffs at his dramatic reaction but inside, his omega is deeply satisfied.

Jaeyoung starts courting Sangwoo a bit more overtly– really, he’d been doing it since the beginning, though he hadn’t realized. Again, this is pure fluff so a lot of his “revenge” was him backwards courting Sangwoo lmao.

Moving on, the first time Sangwoo lets Jaeyoung into his nest has got to be A Moment. Maybe it’s late at night and they just finished working on Veggie Venturer. They’re a couple in all but name only– Sangwoo has accepted all of Jaeyoung’s courting, though he might not necessarily realize it!! He wears Jaeyoung’s clothes, accepts his gifts, enjoys their time together in the same bone-deep way Jaeyoung does. Jaeyoung, for his part, is just content to take it at Sangwoo’s pace and take what he’s given. He knows the path they’re on and he’s in no particular rush as long as they heading the right way.

So it’s late at night and Sangwoo is tired and leaning against Jaeyoung from where they’re sitting on his couch. He says it’s time to rest and Jaeyoung rouses himself to head home but Sangwoo stops him, asks if he wants to spend the night.

Exhausted, Jaeyoung says sure, assuming he’ll be on the couch but then Sangwoo takes his hand and starts leading him into his bedroom and Jaeyoung can’t believe it. Suddenly wide awake, Sangwoo turns him toward the bathroom to get ready and he does in a daze. When he comes out, Sangwoo’s in bed– no, in his nest, and Jaeyoung’s heart simultaneously turns over and goes into overdrive.

The nest is surprisingly full, though maybe Jaeyoung should finally stop being so surprised at evidence that Sangwoo indulges happily in his omega nature.

Just in a tshirt and boxers, Jaeyoung stands next to the bed, unsure. It’s wellknown that absolutely no one is to enter an omega’s nest without their permission and sure, Sangwoo said he could sleep in his bed but what if he’s changed his mind–

His thoughts splinter when Sangwoo looks over his shoulder. “What are you waiting for, hyung?”

And, well, okay.

Gently, Jaeyoung climbs into Sangwoo’s nest. And fuck, if he thought Sangwoo’s scent was overwhelming before, it’s nothing to this. Sangwoo’s scent is concentrated deep into the blankets, surrounding them, and Jaeyoung feels lightheaded.

He lays down, breath shuddering as Sangwoo wiggles back into him, as he takes Jaeyoung’s arm and lays it over his waist.

Jaeyoung’s overwhelmed but still so exhausted and he falls asleep almost immediately.

The next morning, Sangwoo wakes up with his head on Jaeyoung’s chest and, still mostly asleep, finds himself searching for Jaeyoung’s scent gland. Jaeyoung’s scent mingled with his, in his nest, makes Sangwoo purr with satisfaction.

He never really understood when omegas talked about how satisfying it was to find a partner and figured it was just biological compatibility. Sangwoo feels that it’s more than that, though, that he does get it now. It makes his omega feel safe and warm. It makes Sangwoo happy. And it’s illogical and too fast but Sangwoo knows that his omega and him are starting to consider Jaeyoung his mate. Not now, but eventually.

Still half asleep, Sangwoo shifts until he can bury his nose in Jaeyoung’s scent and Jaeyoung wakes up to his omega, his Sangwoo, scenting him. He’s happy, giddy with the thought that Sangwoo is staking a claim on him, finally. That might not be his goal or even on his radar but it is undeniably a fact.

I might imagine that this is their first kiss– or first time depending on how the relationship has progressed to this point.

Then we get into Sangwoo’s heat (so this fic takes place over maybe 8 months?) and I’ll HC that this time around, Sangwoo asks Jaeyoung to be his partner and Jaeyoung absolutely melts. It turns out that Sangwoo is very soft and needy– not demanding at all, just very pliant. It’s also, like I said in the beginning, not just sexual. The sex they do have is very slow and gentle and overwhelming but they spend just as much time just being together– they cook dinner together, watch a movie with Jaeyoung’s head resting on Sangwoo’s stomach, making out with Sangwoo in Jaeyoung’s lap. Jaeyoung has a thing for marking Sangwoo and when they’re knotted together, they’re both so happy and giggling as they talk, Sangwoo surprisingly rambling about some silly topic and Jaeyoung so, so found as he listens.

And then, of course, there’s an epilogue with them mating and Sangwoo pregnant and them having kids <3 literally just all the fun fluff parts of an omegaverse AU I literally think it would fit them so, so well!!!!

#someone PLEASE see the vision with me #my writing tag #my writing #semantic error #semantic error fic #semantic error au #se fic #jaeyoung x sangwoo

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