Chapter Text
They’re cuddling in Derek’s room, watching Star Wars on Derek’s laptop, when it happens. They’ve been cuddling a lot more often recently. Meanwhile, Stiles has been trying not to read too much into that.
Derek’s burying his nose into Stiles neck, and damn Stiles likes to think he has at least a moderate level of self-restraint, but this is seriously pushing his limits. Then he feels Derek’s lips brush against his neck, and Stiles just. Fuck self-restraint. He leans his head back, giving Derek more room as a moan is ripped from his throat.
Derek apparently takes that as a cue to keep going, because he just latches down and starts sucking a mark into Stiles’ neck. In the background, Luke Skywalker is crying out about how Vader can’t possibly be his father, and Derek must find it distracting too, because he leans forward and shuts his laptop, and then there’s only silence. Well, silence and the sound of Stiles’ completely undignified moans as Derek bites down on his neck and sucks.
They shouldn’t be doing this. Stiles knows that. Having sex outside of heat before marriage is pretty frowned upon, but fuck he doesn’t care right now, not when he’s getting pretty much everything he’s ever dreamed about.
“Derek, what are we doing?” he asks, because his lack of a brain-to-mouth just loves to ruin good things.
Derek leans back and smiles at him, eyes lit up like Stiles hasn’t seen them in the past couple of months, before he leans in and kisses Stiles on the lips. He pulls back and says, “I thought that was pretty obvious.”
And okay, so that doesn’t really answer his question. There’s still so much going on in his brain, because in the past few months Stiles had honestly almost come to terms with the fact that this would probably never happen. His life had been turned pretty much upside down, but he’s been getting through it, restructuring his life plans to not include Derek Hale, his best friend, becoming his mate.
Yet here they are.
But how can Stiles honestly be expected to focus on the past few months when Derek’s leaning back in to kiss him?
Derek’s hands come up to cup his face, and his lips press firmly against Stiles'. Stiles brain has basically left the building by the time he starts to return the kiss, firmly replaced by an all-encompassing want. Derek’s tongue presses against his lips, begging for entrance, and Stiles lets him in.
Derek rolls over so he’s straddling Stiles legs, and he leans back to look at Stiles.
“I’ve wanted this for so long,” he says, smiling at Stiles with hooded eyes, and that look of desire is something Stiles has only ever dreamed about being directed at him.
“Me too. God, me too,” Stiles says, reaching a hand out and yanking Derek’s face forward so they’re kissing again. Derek chuckles a bit into his mouth, but the laugh fades into a moan as Stiles grabs Derek’s ass and yanks it forward so their hips are rolling together and then Derek’s very hard erection is pressed against his own, and the feeling is just as amazing as Stiles always imagined it would be.
Stiles has never felt this level of desire before, never felt so blind with lust, but god it feels amazing. He quickly rolls them over so that he’s now straddling Derek, and he just keeps rolling his hips, rutting against him.
It feels great, but god he needs more, so much more.
He doesn’t realize he’s saying that out loud until Derek responds, “Anything. Tell me what you need.”
“Please,” he says, not even knowing what he means.
Derek’s reaching between them, his fingers reaching into Stiles jeans, and Derek's just gotten a hand around his dick which is so, so good, when the door opens.
“Hey losers, dinner’s ready—Oh my god,” Laura says, her tone changing completely as she starts coughing, her eyes glowing red.
Derek yanks his hand out of Stiles pants and leans back, pushing Stiles off of him, eyes wide open in fear.
“Damn it, Stilinski, the smell of you in heat is something I definitely never wanted to experience,” she says, leaning out of the room and yelling down the stairs, “Mom, call the Sheriff!”
She turns back in, nose still scrunched up in disgust. “You’re lucky I’m mated already. You shouldn’t be out of your house in this state, kid. And what the hell, Derek, why didn’t you say something to us earlier? We could’ve gotten him to his room before it got this bad.”
She turns to her brother, an eye raised in judgment before realization appears to dawn on her face, finally taking in their debauched state.
“Oh. Huh. That’s…okay,” she says, extremely confused. “I’m going to go downstairs. I’ll leave you guys to figure this out yourselves.”
She turns around and walks down stairs, shaking her head as she goes.
Derek turns to Stiles, eyes still wide with fear, but now there’s also a look of guilt. “I didn’t know, Stiles, I swear. Oh my god, I am so sorry.”
It all clicks into place. The intense desire he was feeling, the fact that his raging boner still hasn’t gone away, despite all the embarrassment. He’s going into heat.
He’s an omega. Of course he is. That’s what he had been expecting for just about as long as he could remember, but it still hurts. For the last few months, there's been a small part of him that has been pretending that maybe he could be an alpha or maybe even a beta. Anything but an omega.
Because Derek’s an omega, and if there’s one thing that doesn’t happen, it’s omegas ending up with omegas.
“I’m gonna go wait for my dad,” he mumbles, getting up and walking out without looking at Derek again.
*****
Everything changed three months ago, when Derek had been absent from school. Stiles texted him in the middle of English, saying something about how dare Derek leave him alone in that class. English was one of the few classes he didn’t have with Scott, his other best friend, so he really counted on Derek being there to save him from boredom every day.
Derek didn’t respond all day, so after school, Stiles drove to his house to make sure he was okay.
When he knocked on the door, Mrs. Hale answered, looking surprised to see Stiles there.
“Stiles! What brings you over here,” she asked with the fond tone of voice she reserved specially for him and her family.
“I was just checking to make sure Derek’s okay; he isn’t responding to my texts, and he wasn’t in class today.”
Talia nodded, and then she said something that Stiles will never forget, because it ended up completely changing his life. “Derek went into heat yesterday, so he’ll be absent for the next couple of days.”
Stiles laughed, not knowing how else to react. She had to be joking. “Very funny, Mrs. Hale.”
Talia’s face became sadder then. “I’ll tell him you came by when he comes around.”
And that was that. Stiles said goodbye and went home to freak out. Stiles and Derek had been best friends since they were babies, their parents having all been friends since college. Growing up, it had seemed very apparent that Derek would be an alpha and Stiles an omega. Stiles had just kind of always assumed they would end up together, and he thought Derek had assumed the same. No one ever said anything about it, but that’s just the way things would be. Stiles and Derek would talk about the future, where they would go to college, where they would end up settling down, and it was just always a given that they would be together.
Scott had often told Stiles that the two of them disgusted him with how obsessed with each other they were. Then, Allison Argent had moved to Beacon Hills sophomore year, and Scott just looked at Stiles one day and said, “I get it. You and Derek, I mean. I get it.”
Allison and Scott were probably both betas, but they wouldn’t really know for sure for a while.
You didn't really know what you were until puberty hit and you either went into heat, responded to people going into heat, or did neither. People could generally tell what they were beforehand, but sometimes they were wrong.
Stiles didn’t sleep that night, worried about what this would mean for him and Derek. Part of Stiles knew he wasn’t an alpha, but maybe he would be a beta. Beta-omega relationships were rare, but at least they weren’t unheard of.
It scared Stiles that if he was an omega too, he probably wouldn’t even end up wanting Derek that way. It went against their basic nature for omegas to be attracted to other omegas. Omegas were meant to comfort each other, and they made great friends, but not romantic partners.
Stiles had a hard time imagining not even being attracted to Derek. For the last few of years, Derek had played a starring role in most of Stiles’ masturbatory fantasies, and he really struggled to imagine seeing him a few days later and feeling nothing.
That night, Stiles imagined Derek while he was in the shower. He imagined Derek fucking himself on a knotted dildo in his room, Derek’s desperate moans as he desperately gripped himself. Stiles started to stroke himself faster as he imagined Derek begging Stiles to fuck him, pictured Derek with his ass in the air as Stiles fucked into him. He came hard at the new images, a fantasy Stiles had never even thought of.
Two days later, during last period, Stiles received a text from Derek, reading simply, “Come over.”
He was a nervous wreck as he pulled up to the Hale driveway, imagining that everything was about to change even more.
It was Laura who opened the door a few moments after he rang the doorbell, shaking her head at him as she let him in.
“Of course he called you. You two disgust me.” But she was smiling in amusement, and Stiles thought that maybe they would be okay after all.
She walked into the kitchen as Stiles walked up to Derek’s room.
He opened the door and struggled not to gape. He didn’t know what he had been expecting, but it was definitely not Derek’s room still smelling strongly of sex, and Derek lying in his bed in nothing but sweatpants.
Derek looked over, his face unreadable as Stiles walked in, closed the door behind him, and sat down in his desk chair.
They stared at each other for a moment before Stiles said, “Dude I don’t know if you realize this, but it still smells like jizz in here.”
Let it never be said that Stiles had any tact.
Luckily, it appeared it was the perfect thing to say, because Derek laughed before he quirked an eyebrow at Stiles.
“My heat just broke a couple of hours ago, and I’m still exhausted. Excuse me for not taking the time clean everything up.” His voice was quieter as he added on, “I didn’t think I’d have to for you.”
“Dude, no! I’m just messing around. It’s all good,” Stiles said quickly.
It was awkward. It was easily the most awkward Stiles had ever felt around him, and Derek had walked in on the middle of Stiles jerking off to one of his very many Derek Hale fantasies a couple of times, so that was saying a lot.
Stiles looked around the room. He couldn’t see any toys or anything, and in fact everything actually looked really clean. Despite what Derek said, Stiles knew that he had to have cleaned up a lot. The sheets had clearly just been changed.
Stiles got up and got into Derek’s bed, curling up next to him.
“You sure you want to do that?”
“Why wouldn’t I,” he retorted, but Derek didn’t answer him.
Stiles was happy to note that he was still very much attracted to his friend, though he knew from health class that it was possible that would go away after he went into heat himself.
They lay in silence for a while, Derek’s arm around him.
Finally, he couldn’t help but ask, “So how was it?”
Derek snorted next to him. “You already know how it was. You’re in the same health class I’m in.”
Stiles rolled his eyes and moved closer to Derek, leaning his head onto his shoulder. This was good, the bickering. It was familiar.
“You know it isn’t the same. I want to know how it was for you.”
Derek sighed and Stiles thought it maybe wasn’t a good idea to ask.
“It was honestly just really awkward. My mom realized what was happening pretty early on, thank God, and she immediately had my dad drive me to the store to buy…supplies. Which, let me tell you, picking out dildos and vibrators while my dad stands a few feet away, attempting to give me privacy, is a memory I could honestly have happily lived without. Then we got back, and my parents stocked my room with food and bottles of water. A few hours later it had completely taken over. I don’t actually remember much after that.”
Stiles knew Derek, so he could tell that the last sentence was a lie, but that was okay.
“So can I see what you bought?”
“No!” Derek choked out, leaning away from Stiles and glaring.
“Oh, come on! I’m curious. I’ve never bought anything like that. Do you have any stellar recommendations?” Stiles laughed at Derek’s mortification, but a small smile slowly spread across Derek’s face as he shook his head.
“You’re ridiculous.”
“You’re killing me! I need to know these things. While I applaud you for going through what you did, I refuse to go to a heat shop with my dad.”
And then they were both laughing.
The laughter faded, and Stiles sobered up, deciding it was as good a time as any to put everything out there.
“So what happens now?”
He looked up at Derek to see him smiling at him, but with the question Derek became confused.
“What do you mean?”
Stiles swallowed down, trying to get over his nerves.
“I mean, I always kind of assumed…and I mean it’s okay if you didn’t…of course you didn’t I mean why would you when I’m just…never mind.”
He didn’t realize until after he finished that he never really said it, but Derek held him closer and put his chin on Stiles head and said, “I assumed too.”
“So what do we do?”
Derek sighed. “We wait and see what happens. Who knows? Maybe you’ll end up being an alpha.”
“Yeah, maybe,” Stiles said because he didn’t know what else he could say. They both knew that wasn’t likely.
*****
So of course Stiles isn’t all that surprised as he sits in the Hale living room, waiting for his dad to arrive. He’s even sort of planned for this, and in a drawer at home he has a bunch of toys waiting for him that he had kind of hoped he wouldn’t ever actually need to use.
More than anything, he’s just extremely confused. He’s an omega. He’s going into heat. So why did he react to Derek kissing him? Moreover, why did Derek seem to respond to Stiles’ heat? That goes against everything he’s learned in health class about omega heat patterns.
There’s a knock on the door, and Mrs. Hale comes in to open the door while Stiles just stays seated, staring down at his shoes. A huge part of him is hoping that Derek will come running down the stairs, that they can talk before Stiles goes. That maybe Derek will go with him.
And then what? Derek will spend his heat with him? Stiles nearly laughs at the thought. As if that will ever happen.
It’s now official. Despite whatever fuckery just happened upstairs, Stiles and Derek won’t end up being mates. They won’t get married or even date. Stiles is going to go home and spend his heat alone, and then later on he’ll go looking for an alpha to spend his second heat with, as is traditional. Maybe Derek’s already found one to help him get through his own second heat in a few months.
Talia and his dad are talking, but Stiles doesn’t hear them, completely focused on how mad he is. Mad at the world, mad at his body, just so fucking upset with the entire situation. Part of him can’t wait for the heat to fully take over so he won’t be able to focus on any of it, won’t be able to care about anything but his own lust.
“Come on, kid,” his dad says, sounding awkward. Stiles gets up and follows him, turning back to look up the stairs before he walks out. Derek’s door is closed.