AN: Hey everyone! Thank you so much for all the positive feedback so far! I forgot to post some introductions last time, but this entire story was inspired by this awesome gifset on Tumblr: post/89901658085/teen-wolf-au-in-a-world-in-which-werewolves-are. This is also my first Sterek AU and it will have elements of Supernatural and Buffy the Vampire Slayer thrown in as well. I'm sort of winging it, but I have some tricks up my sleeve! Sorry for any mistakes and feel free to leave me a review! Enjoy :D

Stiles was completely unprepared for Derek being at his house when he got home. Not only had he gotten used to being alone after his dad was killed, but he wasn't exactly eager to see how the werewolf would react. According to his records, he'd only been at the auction house for a few weeks, but that was enough. He felt even worse for Lydia and knew he owed her his life for what she had agreed to do.

He entered the gates of his house, making note to re-salt the perimeter now that the demons had come and gone. Any house worth keeping needed a line of defense. The gate locked behind him and Stiles took his sweet time getting into his house. He even disarmed the alarm slow. But the werewolf was nowhere to be seen. Maybe he'd given them more trouble on the way over.

He sighed in relief, rubbing his eyes as he climbed the staircase to his room. He was already pulling off his shirt as he flicked on the lights and nearly fell right on his face. Derek stood in the center of the room, a circle of mountain ash trapping him in place. And he was naked. Completely fucking naked. Again.

"Mother of God…" Stiles shouted in surprise as his eyes shot to the ceiling, determined not to ogle the naked werewolf in front of him. Because he really didn't need that right now, "They couldn't even give you a loincloth or something?"

Derek just stared at him angrily, breathing hard in a way that said 'Fuck you' and Stiles couldn't blame him. So instead of waiting for the werewolf to spark up conversation, the boy went over to his large closet and grabbed a pair of sweatpants.

"Here, these should fit," He handed them to Derek who still stared hard at him, though it looked more confused now. But he didn't make a move to put the pants on, "Dude, I really don't want to stare at your junk," The werewolf's eyes glanced down at the small ring of ash around him and Stiles took the hint, "Right, sorry about that." He stretched his foot out to destroy the circle and Derek moved out of it, slipping the pants on.

"You want me as a bed slave," It wasn't really a question, more of a statement, and Stiles felt himself go red again, "If you think I won't put up a fight, you're wrong."

"No, no, no, and more no," Stiles stepped closer and took off the mountain ash collar with the key Malphas had given him. Derek stared at him slightly confused, "You're going to have to trust me, big guy. And I'd appreciate it if you didn't rip my throat out."

"And why shouldn't I?" Derek's eyes flashed blue and Stiles wondered exactly how long it had been since he was able to wolf-out. He knew he wasn't exactly in the safest position in the world.

"Because I just want to help you."

"I guess you'll want me to call you 'master' now, right?" The bitterness in Derek's voice was laced in sarcasm. Nope, this definitely wasn't going to be easy.

"No, Jesus no. That's just creepy. Stiles. My name is Stiles Stilinski."

"Stilinski…" Derek muttered the name, thinking it over in his head, "The Sheriff's kid?"

"One and only."

"He here too?" Derek seemed perpetually stuck in the past that once was Beacon Hills. Back in the days of Stiles' dad and Chris Argent keeping the town safe. But those days were long gone now.

"Nope. He was killed about a year ago which makes me head of the Stilinski casa. And which also made it possible to drop thirty grand on getting your wolfy ass out of that place. You hungry? You must be, come on, I'll make you something," He kept talking in the hopes it would make this less awkward, and so far, not so much. When Derek didn't follow him, Stiles frowned, "This isn't some trick, I promise. Just listen to my heartbeat."

"I know you're not lying."

"Then what's the problem? Besides, you know, the entire institution of slavery and the fact that demons have taken over…."

"Why."

"Why what?" Stiles asked but he already knew what the werewolf wanted to know.

"Why did you buy me?" Silence hung in the air for a moment because Stiles couldn't quite decide how he should answer.

"It's just something I knew I had to do. Plus in case you haven't noticed. Pale, scrawny human," Stiles gestured at himself and Derek barely raised an eyebrow at the comment, "It was about time I got myself some form of protection."

Derek didn't answer, instead he took two long strides forward and swung a punch at Stiles who immediately dodged it, grabbed the werewolf's forearm and locked him into a hold, twisting him arm with enough pressure to break it if need be. But the wolf only let out a slight bitter laugh.

"What the hell was that!" Stiles said as he released Derek who stood up straight, eyes locked to the boy's amber gaze.

"You don't need protection. You've had training, extensive from the looks of it."

"If you're asking if I can handle myself, the answer is yes. But I'm still human and demons still have this big hard-on about trying to hop inside of me," Stiles decided to stop where this conversation was going before it went somewhere dark, "I'm going to make a sandwich. If you want one, come with me. If not, you can have your pick of the guest rooms."

"I could eat."

At least that was a start.

"Oh no, this cannot be happening."

"Believe it, mistress." Peter said the words bitterly and it was at this time Lydia wished she'd give Stiles a more firm 'no.' Because she was so not dealing with a naked man in her bedroom. Especially one who looked like he wanted to eat her alive.

"I don't really appreciate your tone," Lydia threw a pink pillow at him which he caught effortlessly, all while stuck in the circle of mountain ash, "Cover yourself up while I find something for you to wear."

"Aw, is my new mistress shy? I'm not." Peter made no move to cover himself as Lydia dug into her walk-in closet for something that might fit.

"I can see that," She found some of Jackson's old clothes, thank god, and handed them to the werewolf, "These were my ex-boyfriend's. And just call my Lydia."

"Maybe I prefer 'mistress,' really confronts the reality of the situation, doesn't it?" As he spoke, Lydia broke the ash circle and Peter stepped out, still not pulling on the jeans she gave him.

"Listen, this wasn't even my idea…" As she spoke, Peter's hand wrapped around her throat and she felt herself get pressed against the wall, his hot breath in her ear.

"You took me away from the one thing I excelled in. Killing. Now what am I supposed to do about that?" No way was she going to deal with this psycho wolf shoving her into walls, not today, not ever. Lydia opened her mouth and let out a bloodcurdling scream that was so powerful it forced him backward onto the floor. She readjusted her blazer before speaking.

"Is that out of your system now?"

"You're a banshee?"

"So they tell me. Look," She took a step towards him as he stood and finally pulled on his pants. Thankfully, "I don't want a slave, I don't even believe in owning them, but Stiles was dead set on saving you and your nephew so that's why you're here. You're safe here, but not if you're determined to try and kill me. That just won't end well for you, got it?"

"Fair enough." Peter pulled on the shirt and eyed her curiously, clearly this was just as bizarre for him.

"I guess you have run of the house, but you even try and use a weapon against me, you'll regret that too. But we could use a wolf with your talents, so I guess this isn't a total disaster."

"And how would talents like mine benefit you?" Instead of answering him right away, Lydia pointed to the silver arrow that hung over her bed, a small phrase written in French underneath it, "You're hunters."

"We prefer 'protectors' but you get the general idea." He stepped closer to the hanging arrow and was silent for a few moments, mulling the idea over in his head.

"Are werewolves on your hit list?"

"Only ones that threaten people. We want what anyone who lives in this world wants, to get things back to normal. Because being overrun by demons isn't exactly my idea of a perfect world," Lydia looked down at her nails with a frown, "If you agree with me, then we could definitely use your help."

"And why would I help you?" Lydia held up the key to his collar and Peter's eyes widened slightly, something almost predatory in them.

"You don't have to, but something tells me you want to get your hands dirty. And don't give me that creepy look…" She handed him the key hesitantly, hoping this wasn't a huge mistake. He did seem slightly off, but she expected that to some extent, "I'll put that thing right back on if you do anything psychotic."

"Understood. Now, if you'd be so kind to show me to my cell."

"Your cell?" She wasn't sure if he was serious or not, but he looked at her with a deadpan expression.

"I'm your fighter now and I expect to have a cell." Her mind flashed to where they must have kept him at the auction house and her heart went out for him for a moment before she spoke again.

"I have a room for you, like a normal person? With a bed? Come on," Lydia led him to one of her spare bedrooms that was more masculine decorated and the werewolf just stood in the door, attempting now to look somewhat surprised, "It has a private bathroom. There's no way I'm sharing mine."

Peter didn't speak, instead he just slowly walked in, fingertips trailing across the dresser before laying down on the bed, rubbing his face into a pillow. Lydia wasn't entirely sure if she should be watching his whole 'wolf scenting' process but he finally turned to look at her and a slight smirk crossed his lips.

"A wolf might get used to this."

Night in Beacon Hills hadn't been safe in years. Most people did their business during the day, accompanied by slave guards, and by night they locked themselves behind the safety of their walls. And usually a ton of salt, which was growing more difficult that the country was trying to create a ban on selling it. The night belonged to the monsters and it remained that way for miles around. People were scared, and they had every right to be.

Scott and Kira however, weren't. Before they went out on one of their nightly patrols, Scott made sure he put on the fake collar his mom had made for him. He hadn't wore the mountain ash collar since Kira and the Yakimura's had rescued him from the auction house. But if he was caught without it on, they would all get punished.

"I still can't believe Stiles bought two werewolves." Kira commented as they made their way through the woods, her katana hidden in a sheath at her back.

"He kept saying he owed them whatever that means. I don't question him anymore." Scott held a tree branch aside for Kira as they continued to walk, the trees making visibility hard until Kira held up her hand and let golden electric fire sprout from her fingers, illuminating their path.

"Well it wasn't for…you know…" Her cheeks flushed and Scott only grinned, still finding her sweetness to be one of her best traits.

"Like a sex thing? No way," Scott said it but he wasn't entirely sure. He knew exactly how frustrated his best friend was but he knew Stiles wasn't about to force himself on anyone, especially a werewolf with twice his strength, "I think he wants them to join our pack."

"And are you okay with that?"

"If they want to help then yeah. We could use more manpower. Or, people-power. Because you obviously are really helpful too." Scott stumbled over his words a bit and Kira only smiled softly, her hand taking his.

"I knew what you meant," A comfortable silence fell over them as they continued to walk a ways, "So Lydia said that she felt a disturbance out here somewhere. What could that mean?"

"I'm not sure. Usually when that happens, someone winds up dead or we end up with a faery infestation." That was a memory he'd sooner forget. But one thing was for certain, ignoring Lydia's senses was never a good idea.

"Do you smell anything?" Scott took a few deep breaths, trying to detect anything out of the ordinary when his eyes suddenly flashed red.

"Sulfur."

Kira didn't wait for him to say more. She unsheathed her katana which she had anointed with holy water before leaving, and Scott did his best to hold in his wolf. If he changed, the collar would be pointless. But he did have a pocket full of salt and a bottle of holy water just in case. His mom had gotten over protective after the sheriff was killed, but he couldn't blame her.

"Please don't wolf out…" Kira muttered and right on schedule, three demons appeared from the trees, eyes already black. Scott knew by their smell that they weren't high level demons, only ones patrolling after dark for any weak humans that could be made into hosts. Or for disobedient werewolves.

"Now what do we have here? A kitsune and her pet?" Kitsunes were rare, but Kira's family was known enough in the region that the demons knew here traits when they saw it. On cue, Kira let the fire in her palm die down.

"We were just taking a walk." Kira said softly, and Scott wished he had some authority to talk back to them.

"It's a bit late for that. Don't you know there're nasty things out after dark?" One of the demons said and another chuckled. Scott eyed the electric baton at his hip and hoped they wouldn't come to blows.

"I just wanted some fresh air. And I brought my…slave with me for protection." Kira hated the word, it was obvious, and as one demon stepped closer, Scott couldn't control the growl in his throat.

"Control your dog, or we'll do it for you." The demon snarled, "Or we could always show you how it's done." He reached for Kira and something in Scott completely snapped. Lately, anything that threatened her made his blood run hot. He couldn't stop his face from changing as he let out a roar, and immediately the three demons drew their batons.

"Take this one alive! Bael will want him as a pet." One of the demons sneered and Kira drew her katana, eyes glowing with foxfire as she prepared to fight.

"You won't touch him."

All hell broke loose then. Kira jumped forward like the lightning in her veins, slashing at the demons where she could, smoke rising from their skin. Even when the electric batons hit her, their energy didn't affect her, if anything, it urged her on. She buried her sword into the chest of one of the demons, shooting foxfire up her arm and through the man. He shuddered, convulsing from the blessed blade, and fell stunned. They may have been human once, but the pack had realized a long time ago that they couldn't save everyone.

Scott had dug his clawed hand into his pocket, getting salt under his nails as he scratched at one of the demons, it cried out as the salt burned its skin. This wasn't good. They couldn't leave without taking these demons with them or run the risk of Kira's family getting punished. When he looked at the third demon, Kira had already shocked it with her foxfire, throwing Scott a length of cord. It was Lydia who came up with the idea to carve demon-binding symbols into rope to contain them. And Scott didn't waste time tying up the demon he fought.

"We can't leave them here." Kira said as she bound the two demons she had stunned. Scott thanked God every day that foxfire could help subdue a demon.

"I'll call Stiles."

"This better be pretty damn important for you to be interrupting my bonding sandwich experience. And I mean life or death, dude." Stiles whispered into the phone after nearly flipping over his kitchen table to answer it and leave the room.

"You're eating sandwiches with the werewolf you just bought?"

"He was hungry!"

"We're not getting into this, I need your help. Me and Kira ran into some trouble in the woods and we have things tied up." Stiles didn't need more details than that. Typical grab and go operation, for the most part. And number one rule of phone calls was never give out too much info because anyone could be listening.

"Text me exactly where you are. I'll be there in like five minutes."

They never really said goodbye anymore, like even the word was taboo. Instead Stiles pulled on some shoes and made his way back into the kitchen where, thankfully, Derek had started eating his second sandwich. The werewolf looked as brooding as ever, even though he was eating a ham and cheese sandwich.

"I need to run out for a few minutes and I'll be coming back with Kira and Scott. There's a demon problem we need to take care of. We'll go straight to the basement so if you'd rather not be involved, you can hangout up here." Stiles grabbed his keys, punching in a code on the safe in the kitchen as he pulled out a sawed-off shotgun with salt rounds, bottle of holy water, and a blessed dagger that he threw in a bag over his shoulder.

"You shouldn't go alone."

"I do this kind of thing all the time, dude. It's not a big deal." But Derek was standing up then, fists slightly clenched as if ready to defend himself.

"I can't help protect you if you leave me here." They stared each other down for a moment before Stiles sighed, not wanting to waste more time. He grabbed the fake collar Melissa had made for him and handed it to Derek.

"Fine. Put this on and try not to wolf-out. There're only so many demons I can handle in one night." Derek put on the collar and they headed for the garage, Stiles chose his Jeep because it was his favorite despite the other options. Plus, it was good with terrain.

It took only a few minutes to get to the woods, and even less time to find Scott and Kira who clearly had their hands full. The minute Derek got out of the Jeep and smelled Scott, his eyes flashed blue, almost growling before Scott's flashed red and that seemed to quiet him. Damn werewolf hierarchies…

"Scott and Kira, this is Derek. Derek, this is Scott and Kira," Stiles said quickly as he helped Kira get one of the demons into the Jeep. They needed to work fast, "Sorry for throwing you into this, but this is sort of what we do." Stiles spoke to Derek who watched them with his face unreadable.

"You're hunters."

"Pretty much, yeah." Scott said as they got the last two into the Jeep.

"Hunters who work with an Alpha werewolf?" Derek seemed slightly confused by the whole thing and Stiles didn't blame him. They were sort of a motley crew.

"Me and Scott have been best bros since before all this demon bullshit, he just happened to get bitten in the process. Kira bought him back when the slavers got him," Derek glanced at Kira when Stiles spoke and she smiled softly at him, "Seriously though, we need to go. My Jeep doesn't double as a demon clown car."

The ride back was about as awkward as Stiles expected. At least when Kira bought Scott, it was like a rescue mission. Stiles buying Derek, that was a whole other boat-load of ambiguity he was not ready to discuss yet. With anyone. Luckily, exorcisms gave him something to do. Stiles made sure to re-salt his gate on the way in too.

"Let's get these handsome devils tied up before they…" Stiles started to say as they dragged the demons into his basement filled with hunting supplies, but one decided to wake up right when he spoke, eyes turning black as he fought his bonds.

"What the fuck do you think you're doing?" He growled out as Scott tied him to a chair, Kira and Stiles tying one up together and Derek did the last. Maybe it was good he came along after all.

"Sending you on a one-way train back to hell, douchebag." Stiles said firmly and Scott just gave him a look.

"I thought you were gonna calm down with the tacky phrases, dude?"

"Aw, I just can't help it."

"Bael will skin you for this!" The demon hissed so Stiles pulled his holy water out and splashed it against his skin as he cried out in pain.

"Are you sure you're up to this, Stiles?" Kira asked and Stiles cracked his neck, stretching out his limbs for a moment before nodding.

"I can do it. Salt me," He glanced over at Derek who merely stood silent as he watched Scott make a ring of salt around Stiles, a purely protective gesture. He didn't need one of these demons jumping ship into him, "Everyone grab a partner."

Scott and Kira held a demon down, and Derek took his cue and grabbed the last. Stiles took a deep breath, knowing exactly what this would do to him, but still he started to recite the Latin.

"Exorcizamus te, omnis immundus spiritus…" Stiles began to say the exorcism rite and almost immediately the other demons woke up, all screaming out in defiance at what he began to do. He continued to speak and the chairs they sat in began to shake and try to lift off the ground, but Derek, Scott, and Kira held them down.

"Ab insidiis diaboli, libera nos, Domine…" Stiles felt himself growing weak, the energy in the room thickening as the earth under their feet shook, the lights themselves flickering as the demons let out inhuman screeches. Stiles felt blood trickle down his nose and into his mouth, but he couldn't stop.

"You can do it, Stiles!" Scott yelled out over their voices as Stiles did everything he could to remain standing. His head began to pound and he felt his very bones rattle. More than one demon was always a bitch.

"Cessa decipere humanas creaturas…" Stiles cried out the words, tears in his eyes. Almost there…He thought to himself as the demons began to violently shake, mouths opening wide as Stiles finally made it to the last line of the rite, "Te rogamus, audi nos."

It was this exact moment black smoke shot from the mouths of the three men, sinking deep into the floor and down into the earth, leaving a singed black mark behind. Stiles smiled wearily when he realized that two of the men were alive. The one with the sword wound wasn't so lucky. Black formed around his vision and he tried to stay standing but it was no use. The last thing he heard was someone calling his name.

"Stiles!"

Derek couldn't understand the level of trust Scott had for him already. After Stiles had passed out, Derek had checked to make sure he wasn't dead (because it seemed like the right thing to do) and Scott assured him that this wasn't out of the ordinary. But in the last 24 hours, Derek's life had been far from ordinary.

"He should be fine. If he doesn't wake up soon, or if anything happens. Call me. We need to get these people somewhere safe."

The Alpha had the makings of a good leader and it was something Derek could respect. Seeing his relationship with the kitsune made him realize that maybe Stiles could be trusted not to treat him like most masters did. The fake collar alone was proof of that.

Scott and Kira took the one body to bury and the other two injured men to some underground facility that housed possession victims. Derek had a lot to learn about the town he left years ago. It may be a remnant of what it once was, but there was good hiding here too, and maybe he'd found it after all.

After examining the house more, and there was plenty to see, Derek couldn't really believe that Stiles was the only one who lived here. There were enough rooms for at least five people and nearly each one had its own locked safe full of what had to be weapons. He was nothing if not prepared. Finally, Derek came to Stiles' room which made him slightly uncomfortable considering a bunch of demons had forced him here naked. But at least that went better than expected. The boy lay on the bed, breathing evenly despite the fact that even while sleeping he looked worn out. Derek could see the scars on his skin and wondered how many more he really had.

"What did I miss?" He mumbled groggily as his eyes opened, long-fingered hands coming up to rub his eyes as he sat up slightly.

"Do you make it a habit of passing out after exorcising demons?" Derek ignored his question because he figured his was more important. Watching Stiles rip those demons out had been his first real exorcism done by the books.

"It takes a lot out of me. But I'm the only one who can do it. Lydia taught me the Latin and we realized after my dad died that supernatural beings couldn't exactly command a demon to leave."

"And the ring of salt protects you from them."

"Exactly."

"They could repossess someone and rat you out. Doesn't that worry you?" The one thing Derek learned about demons is that they never stayed dead; they always found somewhere else to jump to.

"Nope. The rite we use is one Lydia found that dates back centuries. It sends those black-eyed bastards back to hell permanently. Or wherever dead demons go. Emphasis on the dead part."

"You actually killed them?"

"Why do you think it took so much out of me, man?" Stiles swung his feet onto the ground but immediately doubled over in pain. Derek could sense it on him, along with the fidgety natural scent he was learning to recognize as his.

"You should rest more."

"No way, I'll rest when I'm dead." There was something almost dark in Stiles' voice that made Derek step closer, a wince escaping the boy as he weakly forced himself to his feet. How many times had he done this and was forced to take care of himself?

"Don't fidget." Derek said gruffly as he placed his hand on the boy's forearm, feeling immediately the deep-set ache in his bones that stretched across all of him. No wonder he seemed in pain. The werewolf started to leech out some of the pain and Stiles let out a moan that made his face flush.

"Ignore whatever sound just came out of me and keep doing that pain thing you're doing. I'll make you a sandwich of your choice every day for the rest of your life if you keep that up."

"So all this, demon hunting, is what you and your friends do?" Derek took his hand away and Stiles almost seemed disappointed that the healing stopped.

"Demons, slavers, witches…pretty much any force of darkness that we can get our hands on. You figure, the world's gone to shit, might as well take some of the evil out while you can, right?" Stiles eyed him curiously, mouth slightly open before he spoke again, "You want in?"

Derek contemplated it. He thought about being captured, about being tortured and forced to fight for weeks, thinking that he'd be bought up by someone who would force him into sex or some sort of sadistic shit. But instead he ended up here with people who were just trying to win the world back from the darkness that took it over. And he had darkness enough in him that needed cleansing.

"Yeah. I want in."