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lorewriter · 2 months

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Warning ⚠️: content is 18+ minors DNI.

Fanfic Need To Know: ShigaDabiHawks. Smut fic. 5k. Unusual ABO Dynamics.

Note: this has not been beta read so I apologize for any mistakes.

Fire, Ash and Angels.

“New Omega laws have been put in place as of today. This is for the good of all classes, so make sure to properly follow them or submit to the consequences. The laws are as follows; 1. Omegas must be accompanied by their mate be it Alpha or Beta. 2. Omega’s are no longer permitted to leave their family homes until they are mated. 3. Omegas must go through each heat, suppressants are no longer legal for Omegas to use although they will still be available to Alphas. Finally 4. Abortion is now banned for Omegas under penalty of death. Abortion clinics will now only be available to alpha and beta women.” *click*

Smoke filled the room as blue flames licked at the seams of the scars running all along Dabi’s body. Rage overtook him as yet more restrictions were set by society for him and his fellow Omega. He’d been having a halfway decent day with some strong painkillers he’d acquired earlier that day. After taking a couple he’d decided to lounge on his couch and watch some tv while waiting for them to kick in. Lotta good that did as his quirk reacted to his inner rage causing him to burn through the couple of pills he’d taken just twenty minutes prior.

Suddenly a knock could be heard coming from the small window in his bedroom. Getting up, he made his way into said room only to find red eyes glaring at him through long white hair. Opening the window he moved aside to let the other in, knowing the other was probably just as angry as he was.

“I can’t fucking believe this.” A raspy voice half shouted. Causing Dabi to slightly flinch at the sudden noise before settling in his anger once more.

Shigaraki Tomura was a semi-famous streamer and unknown leader to a group of omega and omega supporters whose goal was to ultimately take down the government, and to change the sexist laws that had been in place for generations. He’d started this underground group when he’d turned 15 and now at age 20 was being searched for by the police and pro heros alike. No one had ever come close to finding him though, thanks to some underground heros secretly being Omegas despite it being illegal for Omegas to become pro heroes in the first place.

“Every time I feel like we’ve taken a step forward, they push us back by ten. It’s infuriating.” The white haired omega seethed, plopping down on the couch Dabi had previously been occupying.

Dabi had no words as he looked at his childhood friend and mate seething on the couch with notes of distress leaking from the sent patch he kept on his neck and wrists. Deciding words wouldn’t be enough right now, Dabi made his way over to the other crouching down to come face to face with his increasingly distressed boyfriend. Moving slowly, he pulled off the others patch before slotting his wrist against the others neck in an attempt to calm him down just a little. Letting out a small gasp, Tomura’s body immediately relaxed as his partner's scent slid over him like a blanket. Campfire and Cigarette smoke. An unusual scent for an Omega but it wasn’t like his was much better, with it being metallic with a hint of vanilla.

Both scents were frowned upon by society, deeming them both as either bland or not soft enough for normal Omega standards. They didn’t care though as they were already breaking society's rules by simply being together. An Omega being mated to another Omega just simply wasn’t allowed and the only reason it wasn’t made a law yet was due to people already beating and raping any Omega that dared to love one of their own.

Both understood the risk but like with most other laws and restrictions in their world they decided to say fuck it. They’d started dating officially at age 15 but had been helping each other through heats since they were both 13. Heats came once every month and became more and more hormonal as the person grew into adulthood. Since they were childhood friends, their cycles had synced up due to the shared pheromones between them.

At age 15 they met Keigo, a young alpha who after showing his hatred for the system and the people who had basically enslaved him, had become quite close to the two. Going so far as to look after them whenever they needed it. At age eighteen they invited Keigo, now known by his hero name Hawks, to share a heat with them.

They’d both talked about it extensively before offering, having the other already know that they were mates long before. Keigo had agreed but not before another long conversation about boundaries and what this would mean for the three's relationship going forward.

They’d all agreed on some set boundaries along with just starting out as heat partners for the time being. The first time they were all together was a bit awkward but quickly smoothed out as Keigo got to know just how the two usually handled their time of the month. Overall it had been an experience they’d all wanted to repeat.

A phone ringing was what startled the two out of their moment, as Dabi shifted away to let the other grab said phone. Glancing down, the ID read pretty bird. Clicking on the green answer button and setting it to the speaker, the two only needed to wait a moment before a semi- loud voice rang through the phone. “Are you both ok?” Came hawks' winded voice, clearly flying while calling them. “Yeah we’re both ok, Kei. I just arrived at Dabi’s, come over?” Came Shigaraki’s softer tone, having calmed down from his mate's scent.

“Sure, be there in five. Oh and don’t go out Mura, I know you like to sneak out but the heros have been getting closer to you. Time to lay low, ok?” Hawks replied, wind causing the call to glitch a few times.

“Sure pretty bird, just don’t get caught coming here. And stay fucking safe.”

“Sure Mura, be there soon.”

With that the call ended. Taking this as an opportunity, Dabi picked up his mate to carry him to his bed. They’d agreed that a few days before their heat was set to start they’d stay together until it ended. Dabi had wanted to move in completely together, but both Keigo and Tomura had refused, saying it would be too dangerous at the time. With Hawks being the number three hero and Tomura running his underground network, they couldn’t risk all being in the same place permanently. Not to mention his job. Dabi was known by most as an un-classed assassin that would work for any mafia that he shared mutual goals with.

They nicknamed him Kitsune. A trickster who moved with the grace of a fox, causing chaos and death wherever he went. The real reason he joined mafia groups was to rescue trapped omegas, as many as he could. Many thought he was a beta, some thought he was an alpha. But no one had ever suspected him of being what he actually was, an Omega. The omega’s he set free were set up in safe houses that Tomura’s network setup. They’d had this plan since they were thirteen. And finally it was doing some good.

Once Hawks and a few other underground heros had joined it’d become a bit easier, making it to where they could get out more Omegas at a time. They were happy with what they had accomplished so far, but they still had work to do. They wouldn’t stop until all omegas were free.

It seemed like forever before a soft knocking sound could be heard coming from the window. Dabi hadn’t bothered to pull the shade down after Tomura came in so they could both see hawks sitting on the fire escape waiting to be let in. Pushing himself up, the black haired Omega made his way to the window, letting the blonde inside much like he’d done earlier with Tomura.

Once fully in, Keigo immediately latched onto Dabi, moving to remove his own scent patch in order to mix scents with the other. It only took a moment before the scent of oranges and sandalwood filled the room causing both Omegas to unconsciously relax around who they deemed a safe alpha.

“Are you both ok? I can’t believe they set these new fucking laws, and what about the mission coming up? If Omegas can’t be out alone… we don’t have enough patches for everyone-” Keigo’s spiraling was cut off as Dabi clasped his hands around the alpha’s face, kissing him to shut him up. The kiss itself only lasted a couple of seconds before Dabi was pulling back once more to reassure the younger. “We’re going to work around this. I agree this is a setback but that’s never stopped us before.” Dabi encouraged, putting his wrist against the blonde's neck in order to scent him.

“He’s right, Kei. This is only a setback, we‘ll work through this like we’ve done every time before.” Tomura called from his place on the bed, gesturing for the older to come over.

Upon reaching the bed, Keigo was immediately pulled down to lay across the white haired man’s chest, positioned in a way that would allow Tomura to pet his hair and snuggle him at the same time. It was three days until all three’s heats and rut would begin but both Omegas always got extremely clingy and touchy in the following days. No sex was allowed until their shared cycles began due to just how agitated their genitals would be by the end of it.

With Dabi joining them, they shifted in a way to where Keigo was on top of both of them covering what was left with his wings. It was true that Tomura and Dabi got clingy but it was almost overshadowed by Keigo’s need to protect and cover them from the view of anyone outside their group.

It was an instinct all Alpha’s had, hiding their vulnerable mates from view in order to properly take care of them and keep them safe. Adding on Keigo’s bird traits only caused this instinct to heighten, meaning that when he did go into a rut, the windows and doors needed to be blocked before he could calm down.

Keigo cooed softly as a warm hand started preening his wings, while another slightly cooler hand carded through his hair. Keigo couldn’t be more happy with the relationship he had with the two Omegas. He’d fallen head over heels for the two when they’d first met at age 15.

It was during one of his missions for the commission that was ‘off the books.’ He’d been tailing a big ceo alpha one night when suddenly the man turned into an alleyway off to the side. Following quickly, Keigo stopped at the mouth of the alley only to be surprised at what he saw.

The man had apparently taken an interest in a tall black haired man, which with further inspection turned out to be an omega. An omega who currently was going into heat by the scent of things. Waiting a little longer, Keigo saw that the alpha had cornered the omega against a wall and was practically shoving his head into the other's neck. He could hear the black haired man curse at him while trying to shove him away, but it was to no avail.

The man at that point had started to growl, and get really physical. He’d gotten the Omega’s pants undone by the time he’d made up his mind to blow his cover and intervene when out of the darkness came a loud hiss. The distinct hiss of an angry omega. Suddenly the alpha was being thrown into the other side of the ally with what looked to be a white blur moving quickly after him. All that came from the man was a cut off scream before he seemed to melt into- what was that? Dust? Ash?

Well it didn’t really matter as he was quite dead now. Glancing back to the omega in heat he saw a slightly shorter white haired man reach out, redoing the other's pants before readjusting them to where the taller was leaning on the shorter.

Deciding that he couldn’t just leave them there, he slowly made his way into the alleyway. Immediately he was hit with the scent of distress. The minute he was noticed, a sharp hiss could be heard coming from the white haired omega. Small whines and whimpers could be heard coming from the other as he was clearly in pain and scared due to his vulnerable state. He was only a few feet away when he stopped, putting his hands up to show he wasn’t a threat.

“I’m not here to hurt you, I just wanted to make sure you both were ok.” Keigo spoke, using a softer tone to try and further show he wasn’t going to do anything.

“Fuck off, we don’t need your help.” The white haired omega spat, adjusting to the black haired omega to be further hidden by him.

“I’m sorry, I know the last thing you want is help from an alpha but I really don’t think you’ll be able to carry your friend alone.” Keigo tried again, moving down onto one knee so he wasn’t looming over where they were slouched on the ground.

Just as the white haired omega was about to respond, a loud howl could be heard coming from the black haired omega. “Shit, he’s dropped fully.” The white haired omega hissed, moving his wrist to slot itself against the other's neck.

“You don’t have much time, all alpha’s within a five mile radius would have just heard that howl. They’ll come here and I don’t think you’ll be able to fight them all off on your own.” Keigo reasoned, becoming a little more desperate as his senses threatened to take control.

“Fine. But if you try anything, and I mean anything, I’ll kill you faster than you can even blink.” The omega relented, adding on a threat for good measure. Finally having the go ahead, Keigo moved to take the black haired omega into his arms. “Where does he live? Is it far?” Keigo asked, looking towards the entrance of the alley to make sure no one was coming in.

“He lives about three blocks from here, I’ll lead you there but you’ll need to leave immediately after.” The white haired omega spoke, getting up from where he’d previously been huddled on the ground.

“Of course.” Was all he could respond, feeling the waves of pheromones coming off the omega in his arms. It took all his strength to resist his instinct, and even then that didn’t stop the canines in his mouth to enlarge or himself to get hard.

The walk to the omegas house was one of the most difficult things he’d done but he knew it’d be worth it in the end if it kept both of them safe. After all, what kind of a hero was he going to become if he couldn’t help a couple of omegas in a predicament.

Reaching what looked to be an old apartment building with a fence wrapped around it, Keigo noted a sign which stated omegas only. It was common for older buildings to be set as omega only buildings as most newer buildings were made to accommodate alphas and betas. Keigo thought it was stupid but knew that while he was under the commission there wasn’t much he could do.

Making his way up creaky stairs, the white haired omega finally stopped at a door with black lines spray painted on the outside. Ah so that’s what the black haired omega was. Within omega only spaces, there were at least two to three omegas that stood out as a sort of protector over all the other omegas that resided in said space. Given the way the white haired omega fought, he wouldn’t be surprised if he was also deemed as a protector.

“I can take him from here.” The white haired man spoke, already grabbing the black haired man into his arms. “Ah, sure.” Was all he could get out before a door was promptly slammed in his face.

Just as he was about to leave, the door swung open once more, revealing the heat ridden omega from before. “Fuck! Dabi no!” The white haired omega shouted, running to grab the other to take him back inside. Dabi had apparently had other plans as he dodged the white haired omegas grabs and barreled his way into Keigo’s stomach, causing both of them to tumble to the floor.

“Fuck you smell so good.” Dabi slurred from his place on top of Keigo. “Ahh umm thanks? Could you get off me?” Keigo heaved out, trying to resist the pull of an omega in heat.

“Dabi! Get over here now!” Tomura snarled out, using a tone somewhere between an omega and alpha. In very rare cases, there were omegas born with the ability to command fellow omegas and sometimes even alphas, using a tone close to an alphas. It was so rare that Keigo had never met anyone who could do this until now, which was why he was confused as to why he’d immediately felt an intense urge to submit.

Immediately he was snatched from his thoughts as the sound of an omega whining could be heard coming from right above him. Within moments, Dabi was up and off his lap to obey what the white haired omega had commanded. “Mm sorry Tomura.” Dabi softly called, collapsing into the others arms. Sighing, Tomura looked over to where the blonde was still on the floor.

“Sorry about that. Oh and thank you for not trying anything. If you’d like, we can treat you to some coffee as a thank you. My name is Shigaraki Tomura, this clingy idiot is Dabi.” Shigaraki offered, moving Dabi’s head so it rested against his scent gland.

“Umm sure… uhh Takami Keigo is my name.” Was all he could get out, feeling the beginning signs of a pre rut coming on.

“Right, well Takami. Come to this apartment in three weeks.” With that Shigaraki closed the door once more, locking it so the other would have a harder time getting out.

They’d met for coffee like promised and got to know each other a bit better, Keigo decided he really liked both of them, but wouldn’t realize just how much until two years later.

Three days passed in a haze as the trio’s heats and ruts drew closer, it was on the third night that Dabi’s heat hit first. “Mmph, fuck. Mura, wake up. Dabs heat has started.” Keigo’s groggy voice called out. Feeling Dabi, who had ended up between them, rut against his thigh. Whines and whimpers could be heard coming from the black haired omega as he ground down against the blonde's thigh with increasing speed. “Kei… hurts.” Dabi just about sobbed, trying to get as much friction as he could.

“Shh shh, I know I’ve got you baby.” Keigo responded, shifting so that Dabi had more access to his thigh. Slick ran down his leg as the only thing between them was the thin fabric of his boxers. Tomura, who had woken up just moments before, snapped to attention at the sound of his mate whimpering. Moving to wrap his arms around the black haired man, Tomura could feel himself slipping into his heat as well.

Omegas aren’t supposed to mate with omegas, so not much is known when it comes to an omega pairing. And due to a lack of information, it came as a surprise when Tomura’s features started to change to something more alpha like after their first shared heat. His teeth grew a bit larger, not as large as an alphas, but still larger than an omega’s normal size. His build changed slightly, causing him to be a bit broader, while his heat scent took on a bit of a musk that usually only alpha’s had. The final change was the most surprising, as a medium sized knot grew at the base of his dick.

Neither were complaining at the changes and Keigo never felt challenged by the omega so it ended up being a pleasant change all around.

Just as Keigo noticed Tomura’s scent change, Dabi bit his shoulder, causing him to moan as the omega came on his thigh. At that point he knew it wouldn’t take much more for him to slip into his rut, he was just glad they had remembered to stalk up as the week ahead would be tough.

It was about two hours in when Tomura decided to switch things up. Keigo who had been switching between fucking both of them needed a break. So with a growl that had Keigo backing off, Tomura moved to take care of his whining mate who had just slipped back into his heat-addled brain after a brief reprieve. Moving in between the other omegas thighs, Tomura tapped the others lips in a silent order to open up. Obeying with a small whine, Tomura was able to get his fingers wet before immediately using them to slick up his cock.

It didn’t take much to slide in as Dabi was already stretched wide after Keigo had had his turn. Setting a slow pace, Tomura took the opportunity to mouth at the black haired omega’s neck and down to his chest. Keigo who had seemingly been forgotten off to the side was slowly stroking himself, watching his two omegas make love. “Tomura move, come on I need it please.” Dabi begged, causing the white haired man to growl with a snap of his hips.

“Alpha.” Tomura called, gaining the blonde’s attention instantly. “Be a good boy and get your ass ready for me, I think it’s about time you get some attention.” Tomura purred, lacing a hint of a command under it. Immediately Keigo moved to follow the others request, knowing that if he didn’t Tomura would most likely not allow him to cum again for the rest of the night. It was only recently that Tomura had asked if he could top when they fucked and Keigo had ended up stumbling over his words in his haste to agree. All his life Keigo had been taught to only submit to his handlers, which he never wanted to do. But when he thought about submitting of his own free will, he found that he actually liked the idea. And who better to submit to than Tomura.

He was torn once more from his inner thoughts as Tomura began to speak again. This time it wasn’t directed at him but the words themselves were enough to have him grabbing the bottle of synthetic slick from the nightstand that sat beside the bed.

“That’s it Dabi, you’re doing so well taking my cock. You feel so good. Mm fuck baby.” Tomura’s raspy voice purred, moving to the other‘s scent gland in order to coax more of the sweet scent out.

“Please Tomura, please please please. I need it.” Dabi wailed, as smoke started to seep through his seams.

“Need what, firefly?” Tomura questioned, deciding to tease the other a bit.

“Need to… need to cum please Tomu.. wanna cum.” Dabi slurred out.

Moving Dabi’s legs for a better angle, Tomura decided it was time to give in to what the lover wanted.

“Alright firefly, you’ve been so good for me. You may cum. Come on love, show me how beautiful you can be and cum for me.” Tomura commanded, speeding up his thrusts while aiming directly for the other’s prostate. “Mmm fuck!” Dabi moaned as he came, spurts of clear liquid hitting both his and Tomura’s stomachs. Tomura finished soon after, biting down on the others scent gland as his knot swelled and popped.

“Fuck that was hot.” Came Keigo’s hazy voice.

Looking over, Tomura noted that the alpha had obeyed him and had already gotten two fingers inside himself. “Add another.” He lightly commanded, loving the way Keigo’s eyes glossed over as he moved to obey. His knot wasn’t completely like an Alpha’s knot so it didn’t take as long to come down, allowing him to slowly remove his softening dick from Dabi’s well used ass. Grabbing a plug from the top drawer of the nightstand, Tomura moved to fill Dabi up once more, knowing that he would need a bit more time to focus on his alpha. After he was finished, he moved onto his back so that he could watch his partner open himself up.

Keigo whined as his dick felt like it was about to explode, but didn’t dare touch it, knowing Tomura hadn’t given him permission to yet. He could feel as red eyes cased his entire body, a sense of hunger that showed itself through the others scent, becoming more like a rut scent than a heat scent. Movement out of the corner of his eye caught his attention as Tomura moved to sit behind him.

A single gloved hand moved to encircle his torso as the other one started straightening his feathers. A moan ripped out of him at the contact as his partners lips moved against his ear.

“I’m gonna need you to be a bit more submissive than this, Kei. After all, I don’t want you to turn this around on me halfway through, so why don’t you be a good boy and cum for me.” Tomura purred, knowing that overstimulation was the best way to keep Keigo under him.

“Y-yes s-sir.” Keigo moaned, moving his fingers to start directly hitting his prostate. It didn’t take much more for to Keigo cry out, squirting a large amount of seman onto the bed in front of him before collapsing back into Tomura’s chest, cooing and chirping as he did.

“Good boy, such a good boy. That was so good, baby. You did so well for me.” Tomura praised, knowing that both Dabi and Keigo had praise kinks.

“Alright pretty bird, I want you on your stomach.” Tomura directed, moving the blonde to lay on the bed, a pillow being placed under his hips for comfort. Unlike with Dabi who didn’t get overstimulated no matter what they did during his heat, Keigo got overstimulated rather quickly. Causing Tomura to have to take care of both of them throughout their shared time. It wasn’t until near the end of their cycles that Dabi became coherent enough to take care of Tomura in return.

Moving to massage the base of Keigo’s wings, Tomura took the opportunity to just gaze at the beautiful alpha under him. He’d never felt this way for an alpha before but knew at this point he wouldn’t be able to let Keigo go. He could see that Dabi felt the same and wasn’t oblivious to the way Keigo stared at them both over the past few years.

“Tomu, please. I’ve been so patient.” Keigo begged, more bird noices encompassing his pleas as he did.

“Alright, angel. I’ve got you.” Tomura soothed, using some of his own slick to make entering easier.

Keigo was tighter than Dabi so it made it a bit harder to go in all at once, so Tomura took it slow, easing his way past the ring of his hole. Both men moaned as Tomura bottomed out. Waiting for Keigo to adjust, Tomura focused his attention on the alpha’s nipples, tugging and pinching them as he slowly started to ease his cock out. Finally to the tip, Tomura asked if Keigo was ready to which he got an enthusiastic chirp and yes from the alpha.

With that, Tomura slammed back in. Setting a brutal pace as he knew the alpha liked things a bit rough. Moans and whines could be heard coming from Keigo as he scrambled to latch onto the pillow he was strewn across. It took only a moment for Tomura to find the alpha’s prostate and a few seconds to shift and aim for it with each thrust. Keigo’s wings flared, sharpening and un-sharpening as his talons tore through the bed sheets. “How are you feeling angel? Are you still with me?” Tomura asked, moving to flip the other onto his back.

“Mhhmmm” was all he got in return before a wave of bird noises made their way out of the alpha’s mouth.

“Good boy, angel. So good for me.” Tomura purred, licking and sucking his scent gland as he did. With a few more well aimed thrusts and whines coming from the alpha, Tomura could tell that Keigo was getting close. Moving his hand to wrap around the others quickly swelling cock, Tomura squeezed right as the knot formed, causing the blonde to practically scream as his prostate was hit and his knot finally popped. Large amounts of cum covered both of them as Keigo finally came down, spurts of semen still coming out in waves.

With a few more thrusts, Tomura grunted as his own knot swelled and popped in the alpha’s ass.

Collapsing onto the alpha, Tomura took the chance to finally breathe, knowing that Dabi would be waking up soon from his passed out state.

Four days later, with three left to go saw Dabi finally snapping from his complete heat addled brain allowing Tomura to sink into his own. For the next three days, both Dabi and Keigo took turns making Tomura cum as much as he made them. Overall it was a tiring experience for all of them but they couldn’t be more happy.

Extra: The Talk

It was two weeks after the trios heats and rut ended that Dabi and Tomura sat Keigo down to have another talk about their relationship.

“So… you guys wanna mate me?” Keigo asked, voice small as he couldn’t believe what he was hearing.

“Yeah. Is that ok? Do you want that with us?” Dabi asked, suddenly sounding a bit more nervous than when they’d started.

“Of course!“ Keigo half shouted, a huge smile spreading across his face as tears welled at the corners of his eyes.

“Well that’s good, I don’t know what I would have done if you’d said no.” Tomura spoke, relief filling his tone.

“So.. when?” Keigo asked, looking between the two for an answer.

“Next heat. We’d like to be able to mate you as soon as possible. But Keigo, you know this’ll put you in danger right? The commission doesn’t take kindly to an alpha with more than one bonded.” Dabi warned, concern overtaking his features.

“I know Dabs, it’ll be ok. I’ll cover up the marks and use more scent blockers. I hate this, and I hope we can change things soon but for now just having you both is enough for me.” Keigo responded, smiling a genuine smile that he didn’t often get to show.

Just as Tomura was about to speak again he was interrupted by a text chiming on his phone.

Taking his phone out, a frown shadowed his face causing his partners to become more alert.

“It’s from Rain. Aizawa’s been taken by the commission.” Tomura hissed, getting up to get ready to leave.

“Fuck.” Dabi swore moving to follow his mate.

Keigo took a moment to marvel at the power his to be mates exuded as he got up from his own seat. He almost felt bad for the commission. Almost. After all, the commission had no idea what hell they were bringing down on themselves.

End

If you liked the story please check out my ao3. I have other works in progress and if you’d like to leave a comment I am more happy to read your thoughts on the fic.

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