Pheromones (Changbin)
content warning: omegaverse; sex; enemies to lovers
Masterlist
Minors DNI 🔞
word count: 4372
You were determined to make your house as unwelcoming as possible. Thermostat turned up to 26°C? Check! Belt thrown in the dryer to clank obnoxiously? Check! Salt used instead of sugar for the study snack, along with expired milk? Check and double-check!
You were just admiring your work and de-fluffing the pillows by jumping on them when the doorbell rang. "Coming!" you called... a lie, as you still had to put out the lukewarm water so he wouldn't bother asking for something better (like a lukewarm soda).
Changbin didn't ring again, and you hoped he'd just gone home, but when you opened the door, he was leaning against the doorway with his arms crossed to make his biceps larger, and on his face was a devious smirk. "Good evening, beautiful."
"Follow me," you demanded as you rolled your eyes and slammed your door in his face.
Changbin chuckled at the measly attempt to intrude his entrance and marched right in. He kicked off his shoes and followed you to the kitchen, where you had left the trash lid off, making it smell extremely unpleasant. He was completely unfazed, which made you wonder if he lived in filth all the time.
"Here," you ordered as you rammed the glasses into his hands. "If you're going to follow me around, the least you can do is carry something."
"Water? You shouldn't have," he praised as he took a sip.
You watched him in annoyance and cursed yourself for not adding vinegar or something to the glass to make it taste bad. You shoved past him to sit on the sofa, where you promptly pulled open your laptop. You'd already begun working on the presentation by picking a theme and setting up the title page in an effort to make the evening go by as quickly as possible, but you were sure he had the power to stop time somehow. Therefore, you let him watch you work and speed-read any notes he'd need to get by on the presentation part.
Changbin sat as close as humanly possible to you. Your thighs touched, and he leaned back and put his arm behind you on the couch cushion. If you leaned back at all, he'd basically be cuddling you.
"What's wrong, gorgeous? Don't trust me to help with the slide show?"
"Nope," you huffed as you began the slide on pheromones.
Pheromones, Heats & Ruts
"Sexy," Changbin teased as he leaned closer to your shoulder, his breath skating across your skin.
"You picked the topic, dumb ass," you mumbled under your breath.
"And I picked it because it's sexy," he rasped as he watched you type a very biological definition of a very emotional state.
1. Pheromones are chemical signals released through scent glands.
2. They become active during secondary puberty around the ages of 18-21.
3. Omegas experience heats while alphas experience ruts.
4. Heats and ruts temporarily increase pheromone production and fertility.
5. Their biological purpose is to encourage reproduction and pair bonding.
"Mmm, all of this talk about heat is making me thirsty," he hummed while sipping from the glass you'd given him. You bit your tongue and counted through the multitude of ways you could've messed with the water, getting all the way up to 17 before he snapped his hand in front of your zoned-out face.
"What?"
"You daydreaming about me, hot stuff?" he joked, hoping to get a rise out of you.
"If you were in it, then it would be a nightmare," you quipped. "What did you want?"
"You forgot to add a line about the compatibility between omegas and alphas," he corrected.
"No, I didn't," you replied with an eye roll. He had the mental understanding of the heat cycle of a middle schooler.
"Yes, you did...see," he argued as he pointed at the screen. "It's not there."
"It's not there because it's biologically incorrect," you snapped. "Alphas and omegas don't mate simply for their status. They mate when their pheromones present to ideal partners in a favorable way to produce the healthiest offspring."
Changbin stood there with his mouth open before shaking his head and leaning back again. "I can't believe you made heats and ruts sound so...un-sexy."
"Aww, sorry our biology project isn't sexy enough for you. Maybe I'll wear a mini skirt to present in to spice it up," you suggested sarcastically, wishing you could take it back the second he bit his lip and stared at you as if imagining it. You elbowed his side and continued typing.
"What now?"
"We should make a slide on myths vs facts since so many people seem to be confused with the basics," you scathed. Changbin pouted, unhappy with the notion that he wasn't as smart as you, but let you work on the slide in peace while glancing over your shoulder.
Myth vs. Fact
❌ Myth: You'll know your mate the moment you meet them.
✅ Fact: Most people experience attraction over time. Instant mate recognition is extremely rare, though it can indicate a likelihood of powerful offspring.
❌ Myth: Every omega is compatible with every alpha.
✅ Fact: Compatibility varies greatly, and many alpha–omega pairings have little to no attraction whatsoever.
"Like us," you added under your breath.
Changbin furrowed his brows at you, staring as if he couldn't believe you'd say such a thing. You continued typing before he could start a fight.
❌ Myth: Every rut results in knotting.
✅ Fact: Knotting is a physiological response that typically occurs only during arousal and isn't guaranteed in every encounter.
"Myth, (Y/N) knows everything and has never been wrong once in her life."
"Excuse me?" you scoffed.
"You forgot to include the caveat to the first point...omegas can't identify their mates at all until the first heat begins."
"Oh, sorry, I assumed our class was smart enough to know something we learned in the third grade," you snarked before adding the additional info so that everyone with Changbin's reading level could grasp the concept.
"Did I do something to upset you?" he asked, sounding more angry than upset.
"Oh wow, Changbin finally figures out to read the room," you retorted with a mocking clap.
"What's your problem? I haven't even done anything to you," he complained.
"You mean besides the fact that you call me couple-y nicknames all the time? You know I haven't been asked out once because everyone thinks we're dating," you informed him. "You request to be paired with me for every project, and the professors all listen since your father is the Alpha of the pack. You sit beside me during every class and even at lunch like a stalker, and then the one time I spoke to another guy in class this year, you interrupted the conversation."
Changbin sat back with a careless smirk as you described all of the ways he'd tormented you. "So?" he shrugged. "Every omega in class would be grateful for the attention of the future leader of our pack. Why aren't you?"
"For that exact reason," you laughed sarcastically before slamming your laptop shut. "Respect is earned, not given simply because of who your daddy is."
It was clear that Changbin didn't know how to answer that. He observed your crossed arms, and, considering you'd just closed your computer, it was clear you had no intention of continuing to work on the presentation... which was due tomorrow.
"Don't you want to practice how we'll present our slides?"
"No," you said definitively. "It's just a quick explanation of basic biology. If you need to practice, you can do so on your own time."
"But you have the presentation."
"And I added you to the doc when I first started working on it yesterday," you sighed as you collected the glasses to put into the dishwasher.
"Oh..." Changbin muttered as he stood from the couch, finally preparing to leave. "I guess I'll see you in class then."
"Yep."
Changbin glanced back one last time before heading out. You locked the door the second he was outside and fixed everything you'd set up to make your home hostile...not that he'd noticed or even commented on it. You'd put in all that work for nothing...your attitude alone had driven him away.
————————————————————————————
You woke up sweating.
Your hair was drenched, and your head was pounding, and your stomach cramped so badly that you threw up. You glanced at the clock and realized you'd slept through your alarm, too. You only had 20 minutes to get ready for class.
You hopped in the shower to get rid of the stench of whatever nightmare had caused such a reaction (probably one to do with Changbin), and threw on some mascara before running out the door.
You walked into the room right as the bell rang and took your normal seat beside Changbin, who glanced at you in concern. "Are you okay?" he asked, upon seeing your hair that was still wet when you were normally so put together.
"Yeah," you answered as you pulled out your laptop to have it ready for the presentation. Thankfully, your group was second, so all you had to do was sit through one measly assignment before giving your speech and cutting the rest of the day short because you were sick.
Chan and Jihyo presented first. You barely heard their scientific analysis of subconscious social rankings thanks to your cramps. It felt like you were being stabbed over and over, and it only numbed a little when you shifted your seat towards Changbin. He didn't breathe when he felt your arm graze his, and you let out a sigh of relief. You didn't need him to get all cocky about it.
Chan finished the presentation with a joke about betas, and before you knew it, Changbin was reaching for your hand. You snatched it away, of course.
"It's our turn," he whispered.
You snapped your head up to find everyone staring at you. With a groan, you stood and walked to the front of the class, unsure why a few students giggled.
While you connected your laptop, Changbin was off whispering with the teacher. She eyed you curiously and walked over to offer you the chance to present another day. "You don't look well, (Y/N)," she said.
"I'm fine," you assured her as you stood tall and prepared to address the class. In the back of your mind, you wondered why Changbin cared so much that you were sick... and then you felt another ache. You stepped closer to him and took a deep breath before beginning. "Pheromones, Heats, and Ruts," you announced as you read the title slide.
"How ironic," someone joked, only for the teacher to hush them as Changbin glared.
"I'll begin by defining what these things are before describing why they exist. Number 1...pheromones are chemical signals released through scent glands."
You nodded towards Changbin who read line 2. "Heats (experienced by omegas) and ruts (experienced by alphas) come to fruition during second puberty around the ages of 18-21.
"Heats are..." you began, when another ache made you stumble forward. You almost passed out from the strong, nauseating wave curling through you.
"(Y/N)," Changbin gasped as he reached out to catch you by your waist. The second his hand touched you, the dizziness vanished.
You didn't even move his hand this time since it was somehow helping whatever weird illness you'd contracted. "Heats are the point of an omega cycle in which their bodies encourage them to breed. Ruts act as the same for an alpha, though they are more likely to be driven by their omega's cycle."
Changbin turned to make sure he was meant to read line four, and you found yourself fixed on his lips as though he were talking in slow motion. "Heats and ruts temporarily increase pheromone production and..." He paused, noticing your gaze fixed on him. You couldn't look away even if you wanted to. It was as though you were under a spell. He smirked and added with a shy blush of his cheeks and delicious lick of his lips, "...fertility."
You moaned. You literally moaned in front of the entire class because of how he said the word. You tried to make up an excuse and blame it on the cramps by claiming it was from pain, but a wetness pooling at your core told another story.
One of the students whistled, and others started laughing at you. Some pointed, and others whispered to themselves, but you knew it was all regarding your embarrassing scent and inappropriate biological response to Changbin's stupid mouth.
Your teacher moved to calm the class and turned briefly to order Changbin to get you home. He nodded and rushed to collect your things, throwing both backpacks over one shoulder before taking your hand and pulling you from the room.
"Where are we going? Why are you taking me out of class?" you complained. You'd only gotten halfway through the presentation.
"You may be book smart, baby, but you haven't experienced much of the real world yet, have you?" he teased as he opened his car door for you.
"I drove myself to school..." you told him. "What about my car?"
"You shouldn't be driving in your...condition," he explained as he shut it and went to round the car.
In his absence, the feeling worsened. You winced and clutched your stomach to send the cramps away, but it did little to make the pain subside. The second Changbin hopped in, the ache dulled to a mere throb.
"I don't know what's happening to me," you cried as he began to drive. You couldn't understand why your body hurt so badly or why Changbin's presence was the only thing that calmed it down when you hated him so much.
"You'll be okay," he promised, placing his hand on your thigh.
Another moan left your lips.
Changbin looked over with wide eyes, the sound a shock to you both. "I...I'm sorry," you whined. The ache grew to a burning need, and you slid down the seat, inching his hand higher on your leg.
"(Y/N), just wait until we get to your place, okay?" Changbin pleaded. He seemed to have a lot more insight into what was going on than you did.
"Why does this feel so good?" you asked breathlessly, a desperate exhale leaving your lips.
Changbin squeezed your thigh to stop you from taking his hand too high, causing you to turn to him with a pout. "Not until we're home," he scolded.
"But Changbin," you complained while leaning closer to him. Your arm wrapped around his bicep, and your nose scooted towards his neck. He smelled so good...he felt so good... "Oh fuck!" you realized, backing away from him in disgust. "I'm in heat."
"No shit, hot stuff," he laughed as he pulled into your driveway. "Now...let's get inside."
"You can't be serious? There's no way you're coming in there with me."
"It hurts when I'm not next to you, doesn't it?" he pointed out.
You bit the inside of your cheek and pulled as far away from him as you could. The stabbing feeling in your stomach must've shown on your face, but you lied and shook your head anyway.
"We're mates, (Y/N). I've known it all year, so if you'll just get your butt in there, then we can finally..."
"No! It's just some weird alpha-omega thing. We aren't mates. I hate you," you argued...though the fact you hadn't left the car yet wasn't lost on him.
"You hate me?" he repeated with a mocking look. "If that were the case, you wouldn't have needed to stand so close to me today; you wouldn't have tried to make me touch you; and you certainly wouldn't have worn the mini skirt you'd teased me about yesterday."
"I'm not..." you began, but when you looked down, you realized he was right. "I don't remember putting this on."
"You woke up thinking about me because of your heat. You knew I could make it better even if you didn't want to admit it yet," he muttered, leaning in carefully to cup your cheek.
Again...you didn't pull away.
"You said so yourself that alphas and omegas aren't just attracted to each other based on social status alone. Our bodies crave one another (Y/N)," he breathed, his words crumbling the wall inside you that was meant to keep him out.
"But you're the alpha...not an alpha...but like, the main one," you complained. "And if you knew, why didn't you tell me?"
Changbin chuckled and moved even closer. His lips were barely hovering above yours, so close that the pain had gone silent. It knew you were in good hands now.
"I am the big, powerful alpha, and I was brought to my knees by my desire to do right by you. You weren't ready to know we were mates yet. You needed to come to me on your own. And now that you have, I can say it freely. You are my mate, (Y/N) like it or not," he said before crashing his lips to yours.
Just 12 hours earlier, the thought of being in the same room as him had set you on edge. You'd spent hours coming up with ways to annoy him and to make him uncomfortable. Now...all you wanted was more of him.
His lips moved in an all-encompassing pace, and your hands began to roam up his chest. Changbin was strong...really strong...and you wanted to be pinned down by him as he rammed his massive...
"Let's get inside before your scent lingers in my car for the next year."
You frowned, tears brimming in your eyes at his words. "Do you not like my scent?" You'd never felt so rejected before, despite his words not even being that harsh.
"Hey, (Y/N), hey," Changbin cooed as he offered you another kiss. "I love your scent. I just don't want everyone I hang out with to know what you smell like on your heat. That's only for me, okay?"
You wiped your cheeks and nodded before following him out of the car by hopping over the console and going through his door. You weren't interested in letting go of his hand.
"You don't seem to hate me very much," he pointed out as you unlocked the door.
"You're making up for it," you breathed as you pushed him back against the door to shut it. You pulled his hoodie off and flew your shirt over your head so that you could feel more of his skin on yours.
Changbin kicked off his shoes and surprised you by picking you up and cradling you all the way to your room. All the while, your lips never left his, and the pain never returned. It was satiated by his body against yours.
"You said that you knew we were mates already...how?" you asked between kisses.
"I felt drawn to you," he confessed as he lay you back, eyes drawn to your chest rising and falling as you fought to catch your breath. "First, it was the way you looked at me. I was curious why you didn't seem to care about my status," he explained as he tore off your bra. "And then I had dreams about your voice as if you were a siren calling me home," he added before unbuttoning his pants.
You tried not to look, but found yourself too curious. Your gaze fell, and you took in the sight of his hardened cock for the first time. "Oh god," you groaned. He was huge.
Changbin seemed pleased by your reaction.
"And I noticed that I would make little suggestions to you, and without meaning to follow orders, you'd obey," he smirked as he eyed the skirt one last time before yanking it off.
"It's just a skirt," you argued, inhaling in shock when his hands pressed to your bare thighs to hold you open.
"No...it's more than that. Even just this week, you could've changed partners and didn't. You could have opted for a different topic, but you went with what I wanted. You complained about adding the line to our Myths section, but included it anyway. The skirt was just my favorite part," he winked.
You tried to find excuses for why you'd done all of those things, but nothing made sense. He was right... You were genetically predisposed to please him... just as he was to please you.
Changbin let his thumb slide up and down your slick, his touch igniting you from the inside out. You could've screamed from how good it felt, and yet, he didn't stop. Not when you arched off the bed...not when your toes curled...not when you looked up at him with eyes so lustful you could've spilled over right then...and especially not when he collected both of your hands to pin them above your head.
He kissed your neck and jaw as your mouth was busy spilling whines, and he mumbled dirty words that made your heart race. "My little mate is all nice and wet for me. I'm going to be gentle since this is our first time, but next time I'm going to splay you out on my bed, and tie each limb to a different corner of my mattress."
"Binnie," you cried out, clit throbbing under his touch.
"Oh, you'll like that, won't you?" he realized when he felt your thighs constrict around his hand. You were getting too sensitive...too turned on. "You spent all year hating me, and now you get to see what it's like to be loved by me. You get to see how cruel I can be," he taunted as he removed his hand just before you came.
You fell back to the bed and let out a breathless, "Why?"
"You have to earn the right to come, my love," he explained as he aligned his cock with your cunt and tilted you to face him. "And the rules are simple...you can come once you admit that you're mine."
"I'm not..." you went to argue as you rolled your eyes, but Changbin slammed in, filling you and stretching you wide in one deep thrust.
"Funny," he teased before licking up your neck to your ear. "Your pussy feels like mine."
You hated the way his words made you feel. You were sweating and desperate and clung to him as he rocked into you while biting your lip. You wouldn't give him the satisfaction of hearing you moan for him.
"Is my mate denying me her pretty little moans?" he taunted.
"I'm not your mate. You were just the closest alpha to fuck," you spat back. Despite how good he felt, you couldn't imagine a life with someone so annoying.
"Mmm. And yet you walked right past Chan to get to the front of the class," he reminded you. "And yet it was my scent that pulled you in, wasn't it? My scent that made the pain fade away."
"The pain won't really be gone until you make me cum, which I'm sure you're incapable of doing, so..."
"Say what you want, little mate. Your pussy is throbbing around me right now," he hissed through clenched teeth.
"It's a...side effect of heats," you lied. "It's not any indication of how good you are...or bad."
Changbin smirked at your slip-up and increased his pace. The bed rocked beneath you, and the wall echoed from every hit of the headboard. Changbin leaned in to kiss you, only to rudely pull away right as your lips puckered, leaving you wanting more.
"I'll kiss you once you say it, baby. Just tell me you're my mate. Tell me you're mine," he begged as he kissed along your neck.
"Why do I have to be owned by you? Are you mine?" you asked, trying to reason with him.
"Of course I am," he muttered against your skin.
You weren't sure how to feel about that. He was so easily able to admit to being owned, and yet the idea of someone possessing you so finally terrified you.
"Just say it, (Y/N)," he urged. "Say it, and I'll claim you. Say it, and I'll give you more pleasure than you've ever experienced before."
The offer was too tempting to resist. You nuzzled your way back to his lips to kiss them softly before muttering, "I'm yours."
Changbin's face lit up in determination. You weren't sure if it was to do right by you or to finish you off, but he began with a bite. He sank his teeth into your neck, sending sparks of pleasure coursing through every ounce of your body.
It started at the mark and first ascended to your brain, which felt fuzzy and happy. The world looked and sounded brighter, especially Changbin's heavy breaths as he kept his pace strong. The light then moved to your heart, which sped up to match his pace. It inched towards your fingers and toes, making every single cell explode in adoration and sex, and just when you thought you couldn't take any more, it grew, doubling in size and begging to be shared with the one person who would understand how happy you were.
You kissed Changbin and released around him, giving him all of you just as he gave you all of him.
He let go of your hands so he could lovingly hold your cheek, brushing the flushed skin with his thumb as his hips stuttered. You'd never felt so whole before.
"You did so well for your first heat, my mate," he praised as he playfully kissed your nose and cheeks.
You yawned and curled into him. "And what was that thing you said about tying me up next time?"
"You're definitely mine," he chuckled as he wrapped his arms around you.