by cosmic_kvi on ao3

WARNING: SMUT, A/B/O DYNAMICS, MILD BLOOD, BOTTOM TAE, TOP KAI

Kai was a gentle lover. He gave soft kisses, warm hugs, and caring words of affirmation to his omega, Taehyun. He respected his boundaries, showered him in praise and protected him from any threat he detected. Taehyun only felt like himself with Kai. He often told him how he felt like home, a feeling he was looking for his whole life, but never thought he would find. He did find it. They met in a university class and didn't talk much at first, but grew a silent infatuation with each other as time went by. Despite being an alpha, a big one at that, Kai was intimidated by the omega. He made his heart swell and skip anytime they spoke, which scared him at first because he feared rejection over anything else.

Taehyun looked up at him with the biggest eyes he'd ever seen, carried himself confidently around campus and always listened closely. They both felt a powerful connection dragging them towards one another. Eventually, after several hangouts, then several dates, they were inseparable. Taehyun knew Kai was his mate. He knew that they needed to be together forever. Kai did too, but lacked the confidence to say so at the time. Four months into their relationship, through emotional tears and a conversation full of love, they took the leap and did it. A handful of years later, and they never regretted it.

The only thing Taehyun regretted was agreeing to spend Kai's rut with him. Now, it wasn't the first time he had done so. They shared ruts and heats together almost every single time either one occurred the last few years. They trusted each other deeply and communicated effectively even when their minds were clouded with hormones. But, this time Kai's rut was different. It had been over twenty four hours and he knotted Taehyun eleven times. The alpha was insatiable. He usually knotted Taehyun at most six times, sometimes seven, but double digits were unheard of in their sex life. Taehyun was exhausted to his bones and was relieved when Kai finally fell asleep, his face buried in Taehyun's shoulder, protecting the prominent mark on his neck. He quickly followed suit.

When he woke up, Kai had taken the time to gather some fresh water and wiped the sweat and grime from their bodies. Taehyun could feel Kai moving rhythmically on the other side of the bed, like he was thrusting into something other than Taehyun. He was grunting into his pillow, using a toy to fuck, so Taehyun could rest longer.

"Alpha..?" Taehyun murmured lightly, rolling over to see Kai quickly flip from having his back turned to facing him. His eyes scanned every inch of Taehyun's face and neck, desire flashing in his irises.

"I need you, Taehyun. I need my omega. Can't knot this- this thing!" Kai said needily, his hand firmly holding Taehyun's cheek.

Taehyun looked down at the silicone toy Kai stuffed his cock into. His knot was beginning to swell at the base, and semen was oozing out from the toy, coating the entrance. He must've knotted it once already while he slept. Taehyun felt that heated desire he always had when presented with his alpha's sexuality, but his body and mind felt miles away.

"Alpha...want you." Taehyun said slowly, thinking that if he gave his body to Kai he would feel grounded again. His thighs were coated in slick just from Kai's strong orange, vanilla scent glazing over him.

"I love you so much. I love my omega. Fuck." Kai muttered semi coherently, abandoning his toy and maneuvering Taehyun onto his stomach.

Kai licked the back of Taehyun's neck where he swore he could taste his peachy, apricot scent seeping through his skin. He groaned, every inch of his body tense and borderline uncontrollable. Never in his life had he experienced a rut this intense. Taehyun whimpered, moving one leg up and to the side, offering his pussy to his alpha.

"Breed me alpha. Wan'your babies." He begged quietly, ignoring the ache in his hips and lower back.

"God, I've been waiting to hear that all night. Love your body so much. So pretty." Kai rambled, putting the tip of his cock just barely into Taehyun's hole and spreading his slick around.

Eagerly, he sunk into Taehyun, fueled by need and desperation. His body thrummed and pulsed, telling him to keep going. Taehyun moaned as Kai started with a few slow thrusts, cursing and struggling to hold back. His heart hammered in his ears and all he could think about was stuffing Taehyun with his growing knot. Filling his omega up with pups that would grow inside him, going multiple times to ensure success. He lost his coherency and repeatedly slammed into Taehyun's pussy.

"Al-Alpha!!" Taehyun cried, unable to stop moaning and gasping, as Kai triggered all of his senses into overdrive.

"Givin'you babies. My babies. Fuck !" Kai grunted loudly. Taehyun's eyes rolled in pure bliss when he felt Kai's knot starting to prod his hole.

"Knot me, alpha!!"

Kai squeezed Taehyun hips and shoved his knot inside warm cunt, sliding it in and out as he continued to fuck him as it grew instead of leaving it inside. Taehyun winced, feeling a foreign discomfort from the pull of Kai's knot on the sensitive muscles of his walls. His knot was still getting bigger and more intrusive than usual. He shoved it back inside in one swift motion and came hard, roughly pulling it back out to fuck it in one more time while his orgasm wracked his body. Taehyun's shriek, which was supposed to be one of pleasure, pierced his eardrums with the sound of pain.

"OW!! Kai!! Kai, stop!! Alpha!! Stop!! Please!!" The omega wailed into his pillow, gasping for the breath that got taken away when he felt an ungodly strong stinging sensation in his most sensitive area.

"Ome- Taehyun. Taehyun! Wait- wh-what's wrong?!" Kai snapped out of his daze, panting and trying to figure out what happened.

"It hurts! It hurts!"

"What hurts, honey? Tell me where it hurts." Kai looked down at their bodies, at first thinking he put too much pressure on one of Taehyun's muscles, but then seeing a color he never wanted to see when sharing his rut with his mate. Red.

"Oh my god." Kai gaped. Taehyun was bleeding around his cock that still sat halfway inside of him, shrinking in size like Kai's confidence.

"Alpha!!" Taehyun sobbed woefully, searching for the security and comfort he needed.

"I'm here. I'm here. D-Don't move, yet. I'm so sorry. I'm so sorry, baby." Kai panicked. He couldn't tell without better lighting than a bedside lamp if Taehyun tore somewhere, or if the blood was coming from inside. His gut twisted with guilt and shame. He hurt his omega.

"Hurts. Don't want another knot! Please!"

"No, baby. No more, I promise. You're okay. I need to just-" Kai eased out of Taehyun, apologizing again when he whined painfully.

Taehyun trembled as he tried getting up, but found it too painful to adjust himself any further than laying down on his back. He wanted to close his legs, but the pain worsened when he did. Through his tears, he looked down at Kai's lower half, and the blood on it that was leaking out from his own folds. He sobbed again, his panic replaced by fear and exhaustion. Kai crawled up the bed to hold him in his arms, cooing apologetically into his hair as he scented his omega. A couple hours later they went to the hospital and found out that Kai's knot caused some damage internally and externally to the shallow tissues that came before the rest of his vagina. He needed two stitches and that was it.

Well, not really. Taehyun needed to keep the area as sanitary as possible, and was put on some antibiotics to prevent any chances of infection. He was also told to avoid all penetrative "activities" including using tampons for two to three weeks. The only issue was that his heat was expected to follow Kai's rut by a few days. They brought up their concerns to the doctor and she decided to prescribe Kai with some suppressants in order to dampen his scent and pheromones to prevent any hormone induced actions. Taehyun needed to prioritize the antibiotics over suppressants of his own, so he didn't get any. He'd have to go through his heat without any knotting.

-

Early that morning, minutes before the sun came up, Taehyun found himself leaning uncomfortably on the bathroom sink. His preheat started in the later hours of the evening and was starting to really hit him. He was starting to nest without waking Kai and got hit with an awful flash of heat. It made his stomach turn, which brought him to the bathroom where nothing ended up happening. He laid on the floor, basking in the coolness of the tiles for a few minutes until it passed.

However, when he got back on two feet his lower abdomen cramped tightly in the center and around his hips. Taehyun gasped shortly and supported himself with the sink. He sunk down to a crouch low to the floor, wrapping his arms around his legs and whimpering through the pain. There was a pattern to the start of his heat's that rarely faltered. First it was the hot flashes, then nausea and cramps, some more hot flashes until one decided to stick around, and finally, the slick. Taehyun knew he didn't have much time left until he was a miserable pile of complaints, and needed to finish his nest.

Blame the hormones for his lack of straight thinking, because it would be more useful if he collected towels, water and painkillers, instead of dirty laundry to pile on their bed. He filled with dread, as he laid out a blanket and started tossing Kai's pajamas, shirts and even his underwear onto it. His body hit him with another cramp, but it didn't stop him from gathering the blanket into a bundle and dragging everything to his and Kai's room. He was filled with an urgency to get his nest in order.

"Taehyun...?"

The omega's head shot up at the almost hypnotic voice of his alpha, making him freeze what he was doing. Kai sat up, groggy and confused by the array of clothing and blankets placed precariously around the bed. It took his half asleep brain a minute to figure out what was going on.

"Why didn't you wake me? You're so pale." He said hoarsely.

"I needed to make my nest. It's just preheat."

"You're shaking, come here." Kai reached out to pull Taehyun up onto the bed and made sure the rolled up blanket outlining the edge of the mattress didn't fall.

"Are you sure this is just preheat? You're on fire."

"Yes, I'm fine ." Taehyun's face pinched up and he curled up on his side, suffering through more pains.

"Mhm, right. I can smell when my omega's fully in heat from miles away." Kai said, laying back down and placing his hand on Taehyun's waist.

"I'm sorry." Taehyun apologized for lying. Kai rejected it, telling him that he wasn't upset with him and wanted to help.

"But you can't. No knotting, remember?"

"I can help in other ways, baby. You stay here, I'll go get some things." Kai explained before leaving the room.

Taehyun felt his temperature spike and kicked off his pajama pants, leaving him in one of Kai's worn out shirts and a loose pair of underwear. His body continued to succumb to its hormones and brought back a wave of nausea that turned into dizziness. By the time Kai was back, Taehyun was whimpering to himself, drifting off into "heat brain." He whined as Kai circled the bed with a collection of items to ease his discomfort. None of them would work as well as him.

"Alpha come back."

"I'm coming, I don't want to mess up this perfect nest." He said, climbing awkwardly over the clothes and pillows.

With the suppressants he started the day before, he found himself more lucid than ever before when spending Taehyun's heat with him. Most of the time he was a goner for the omega after barely five minutes, diving straight into his pussy to please him. It was harder to detect his alluring pheromones and scent with the suppressants in his bloodstream. His body wasn't reacting physically like it should. Taehyun must've been able to sense that something about his alpha was different, because he was still whining, ignoring the sweet compliment about his nest.

"Shhhh, you're alright. I've got you, little one." Kai soothed. He laid back on the pillows and guided Taehyun to lay on his chest with a leg hooked over one of his own.

"I feel so gross." Taehyun pouted with his eyes shut.

"I know you do. I'm so sorry, sweetheart. Let's just rest for now, yeah?" Kai suggested after taking a glimpse at Taehyun's face. "We can't do anything that might hurt you."

"Mhm." He grunted, already dozing off.

Taehyun's body proceeded to slowly roast Kai like a sirloin for the next few hours. He sweat through his pajama's, as did Taehyun, until it was impossible to determine who's sweat soaked through first. At some point, Taehyun's weight shifted and he laid fully on top of Kai with one of the alpha's meaty thighs between his legs. It was one of his favorite spots. He would find his way to Kai's thigh no matter where the alpha was. If he was gaming late at night and Taehyun wanted some attention, he would climb into his lap and listen to his fingers hitting the keyboard. If Kai was eating or lounging on the couch, he would sit himself right onto his thigh.

It goes unsaid that ninety percent of the time, Taehyun taking a seat on Kai like that usually led to them having some type of intercourse. So, when Kai woke up from the omega wiggling around on top of him, he wasn't surprised in the slightest. A hint of Taehyun's tantalizing apricot and peach scent snuck into his nose and brought his attention to how significantly more wet his leg was compared to the rest of his body. He cursed and held Taehyun's hips, neither stopping nor speeding them. Taehyun continued to gyrate against his thigh in his sleep and whimpered at a barely audible decibel.

Kai nuzzled his nose into Taehyun's hair and moved one hand over to caress his cute little ass. The heat from his body soaked into Kai's, encasing them both in what felt like the center of an over microwaved pastry. The alpha sighed heavily and told himself to turn on the AC once he got the chance. Taehyun managed to get a few more minutes of rest before he awoke with a loud whimper, and pawed at Kai's crotch.

"Alpha, please." He murmured needily, fully submerged into his heat.

"No, baby. No knotting, remember?" Kai took Taehyun's hand and placed it on his chest instead.

Taehyun whined and pushed himself up enough to look at Kai with a desperate expression that shot arrows into the alpha's heart. Kai shook his head, knowing what Taehyun wanted, and watched him look away dejectedly.

"But, I need it. Need it to make me better. I don't feel good." Taehyun complained quietly, his gut aching away.

"I know, I'm sorry I can't help you that way. You know I would do whatever you wanted if you weren't still healing, right?"

"Yeah..."

"Good, cause that's the only thing keeping me from going feral. I don't want to hurt you." Kai explained. Taehyun flopped back down on his chest and nodded. He understood. He wasn't happy about it, but he understood.

"You were grinding on me for about ten minutes before you woke up." Kai snickered.

Taehyun opted out of using words and grunted. His clit was so swollen he could feel it getting stimulated just from Kai's chuckle that reverberated through his body. Grinding sounded like a great idea. Taehyun moved his hips around in a circular motion and moaned, sending fiery signals to his brain that told his body he needed more. Kai's hands ran over his burning skin and dipped into the waistband of his grey panties, sliding them down to get them out of the way. Taehyun was no help in getting them off by lifting his hips for him, so Kai struggled to pull them down but managed.

"There you go. Keep grinding, my omega." He encouraged, maneuvering his own soaked through shirt from between their bodies and throwing it aside.

"Mhmm-" Taehyun groaned.

It took barely five minutes for Taehyun to start breathing heavily, his mouth open and lips sliding around one of Kai's soft pecks. His hand gripped the damp skin of his ribcage, as he rut faster and harder. Kai listened to his sweet sounds and moved his thigh up and down in cadence to Taehyun's movements.

"Al'pa please!" Taehyun mewled into his chest, his core thrumming and tightening.

"You can do it. Cum for me, Taehyunnie. Cum." Kai encouraged slowly, feeling a sense of relief and fulfillment when Taehyun cried out for him and bit his chest, as he stuttered and thrashed on top of him.

"Good omega. Good boy." He praised over the sound of his moans.

Finally, finally a burst of coolness and satisfaction washed over Taehyun as he came, slicking up Kai's leg in the process. He whimpered and purred, licking over the indents his teeth left on the alpha's skin. His kitten-like behavior indicated that he felt safe, loved, and cared for. He would never act in such a way with his closest friends or family, just Kai.

"Better?" The alpha whispered, holding back a loving chuckle, looking down at Taehyun's tongue poking out from between his lips.

"Mhm."

A handful of minutes later, Taehyun rolled off of Kai's body and crawled around the bed, making sure his nest was in proper order. The pain of his heat was gone for the time being, giving him some mental clarity to seek out some water. He sipped from a water bottle Kai set up on his side of the bed and returned to curl up at Kai's side. The alpha took good care of him, checking his temperature, wiping down his thighs and butt, leaving kisses here and there. Taehyun felt truly loved and relaxed. That was until he was doubled over the bed half an hour later, vomiting onto the floor...

"A'pha! A'pha!" He cried between gasps, trying so hard to hold himself up so he didn't fall off the bed and into the mess he made.

"Shh, shh, shhh. It's okay. Breath, Taehyunnie." Kai attempted to soothe, kneeling behind the shaky omega and holding his waist.

Taehyun sobbed loudly, his temperature skyrocketing, stomach churning, and gut cramping. It was the trifecta of heat torture. He could barely think clearly enough to move in the right direction. Kai kept him stable until he was sure he wouldn't be sick again and eased him to lay down against a few stacked pillows. He wiped his lips with tissues and dried his tears for him, cooing and comforting him. The one thing that would make Taehyun's heat symptoms lessen for a couple hours at a time was a knot.

The omega's body was begging him to be impregnated, bred, fucked until dawn even, but he couldn't. He was young, which meant more fertile, which led to longer, stronger heats. The symptoms were so awful because it drove him to find a partner who would breed him and take away the pain. That wasn't an option this time. There was almost nothing Kai could do for him except be there, and be his pillar.

"I need to clean up, sweetheart. Do you want me to open the window for some fresh air?" Kai asked, slowly rising from the bed to fetch a roll of paper towels and cleaner.

Taehyun stared at him miserably and hiccuped, followed by a quieter sob, and then turned over to his side. Kai left reluctantly and returned, cleaning up the mess and sanitizing the area as fast as he could. He cracked open the window to air out the room and turned up the AC. When he rejoined Taehyun in bed he convinced him to sip a tiny bit of water to clear out his mouth, which was followed by a few kisses as a reward. Taehyun's heartbeat was pumping in his ears as he stared at his alpha.

He imagined all the times Kai knotted him, the way his strong arms caged around his body whether they were laying down or standing up, the intensity of being so full and stretched open for his mate. He wanted it. He needed it. Kai's cum tasted like sweat and caramel coffee in the best way, and was supposed to be filling up his womb! Or, his mouth at the very least. Taehyun couldn't remember that he had delicate stitches in the place Kai's knot would go. All he knew was that he needed his alpha to do more.

"Taehyun...w-what are you doing?!"

Kai went wide eyed as his omega rolled to his back and spread his legs, holding them up and back under his knees. He whined for Kai's attention by presenting himself to the fullest and praying that it would get him what he wanted. Kai breathed deeply twice and crawled to sit in the space Taehyun created for him. His omega looked enchanting, glistening and ready just for him. While beautiful, it broke his heart to see the small bit of thread drenched in slick, so small and insignificant, yet so so important to his well being.

"Alpha, look. Please. I want it. I want-"

"I can't, Taehyun."

"Do it, please! Breed me. I want it. Alpha please!"

"I can't knot you!" Kai stated firmly, the words hurting him as much as they hurt Taehyun.

Taehyun whined louder this time and forced his legs apart further, only to be stopped by Kai's big hands, pushing them back together. He felt the world fall out from underneath him. His alpha didn't want him. His mate didn't want him. His Kai didn't want him. He didn't want his body or his babies. He hated him. Taehyun couldn't keep his tears at bay and broke down, letting go of his legs to cover his face.

"Honey, please don't cry." Kai said gently.

"Alpha doesn't want me! Doesn't want his mate!!" He bawled.

"What?! No, Taehyun, that's not it. I do want you, I need you as much as you need me!" He tried to explain.

"Then why won't you knot your omega!!"

"You're hurt. I can't knot my omega because it will hurt him. It's not because I don't want you, or because I don't like you. It's because I won't hurt you." Kai stated as clearly as he could for Taehyun. Hot tears pricked his eyes when all he got back from him was a loud cry of frustration and sadness.

"Taehyun, I need you to listen to me. I know you feel horrible right now, and angry that I won't fix it, but if I knotted you it would hurt you really bad. I am so sorry you have to go through this, honey. I'm right here and won't leave you, I promise."

Taehyun nodded to convey that he understood and reached out for Kai childishly. Kai lifted him up from the sheets and took his place, putting Taehyun between his legs with his back to his chest. There, he waited for Taehyun to calm down, murmuring loving words into his ear and rubbing his stomach. He felt truly guilty for being the reason his omega had to suffer. Despite the long discussion they had after Taehyun got hurt, agreeing that it was a bad accident and such, he still felt like garbage for it.

It didn't take long for the omega to slip back into his muddled mid-heat mindset. Getting upset didn't deter his hormones or body from craving more from his alpha. He gazed down at Kai's hand resting above his pubic bone, moving in circles to lull the cramps, and licked his lips.

"Please touch." Taehyun requested under his breath, letting his legs fall apart and craning his neck to the side to show off his mating mark to entice Kai further. He jolted when slick gushed out of his pussy and impatiently went to touch himself.

"Tch, tch, tch. Not so fast." Kai clicked his tongue, grabbing the omega's frisky hand. "I think that belongs to me."

"Yes. Yes, alpha. Y-Yours." Taehyun blubbered, immediately submitting further from just a few words. Kai chuckled. Taehyun's primal side was one of his favorite things about him.

"That's right. So pretty and wet, hm? Just for your alpha."

"Uh huh! For you. Touch-"

Kai covered Taehyun's mouth and dragged his finger along his parted slit, his mind swirling from the warm slick that drenched the whole thing. It coated the grown out hairs on his vulva, gluing them down on the sides, and clumping some together. Kai could've died. Taehyun was never one to let his pubic hair grow out too much, always keeping it trimmed flush to his skin. The few occasions where he wasn't bothered enough to main his self grooming, were the times Kai couldn't take his face out from between his legs.

"You're so soft, baby. Does that feel good?" He purred, circling his ring and middle finger around Taehyun's swollen clit.

"Mhm!" He moaned into Kai's palm.

Kai teased him momentarily, rubbing his fingers up and down either side of his pussy and very lightly prodding his hole. It was loose, wet and absolutely begging to be filled up. Kai's alpha flared up inside of him, roaring and raging that he couldn't give Taehyun his knot. He kept it at bay by tasting the slick off his fingers and groaning.

"My omega tastes so good. I want more."

Taehyun whimpered, as Kai swapped their positions, laying down between his legs and holding his thighs apart with a firm grip. He squealed when the alpha's lips and tongue started massaging his sensitive bump. He clawed at the bedsheets and rut his hips up into the sensation. Kai savored the sweet, tangy flavor of his omega's slicked up cunt, his chest bursting into flames at the sight of Taehyun with his head thrown back and muscles tensing. He puckered his lips and sucked lightly while prodding his tongue against Taehyun's clit, making him moan loudly.

" Auhh! Ah! Ah! "

Kai slurped and swallowed Taehyun's slick like it was sugar water. The suppressants had done their job up until that point, keeping the alpha unaffected by the pleas and intoxicating scent of his omega. But, as he lapped away at Taehyun's pussy like a puppy, he noticed his cock starting to harden. He didn't falter his touches, he was confident that he could hold back and get away with using his hands, the mattress or a toy if it was really necessary; but something already told him it would be upsetting for Taehyun to see him fuck a toy instead of him.

"You're making me hard, omega. I love your pussy so much." Kai uttered under his breath, pulling away for only a few seconds and going right back in.

"K-Kai! Don't stop, please! Nnhg...ah mmmh!! " Taehyun wailed, thrashing and arching his back as his orgasm built up and up.

"Such a good boy, cum in my mouth, omega."

With those words, Taehyun's voice cut itself off as he gasped and came hard against Kai's tongue, slick surging out into his mouth. His orgasm ran him over like a bulldozer, making him moan incessantly and his thighs twitch under Kai's palms. It lasted at least thirty seconds before he felt that rush of cool air and went limp with a little whine. Kai laid his head on his thigh and kissed the flesh, as Taehyun panted and whimpered now and then.

"You're so pretty like this." Kai whispered, sighing contently when Taehyun's hand found its way to his hair. The same hand stopped him a few minutes later when he made an attempt to sit up.

"More, alpha." Taehyun requested.

It was going to be a long weekend for Kai