A/N: Sorry I couldn't incorporate some of you guys' great ideas, but it was already written! Also sorry it took awhile to post, tumblr is eating my life and so is work. BUT HERE IT IS and also as a consolation prize I'm putting up another Sterek one-shot I wrote yay.

Chapter 4

All Scott can think of is how confused the janitorial staff is going to be in the morning when they come in to clean the school and the halls are lined with salt.

Frankly it looks kind of like some giant decided to do a line of cocaine in a pattern that just so happens to encircle the nurses' station.

He finishes his section and leaves his Morton's container where it lies, empty, hoping that it'll be enough to tip off the janitors that they don't need to call in the FDA, and heads down to join the others.

"Te rogamus, audi nos, te rogamus, audi nos," Lydia is murmuring incantations under her breath as she flips through her sticky notes. She seems a little shaky, not quite as confident as she was back in her room. Scott's surprised it took this long; even for how well Lydia took the news (and he really never expected anything else), anyone would freak out over finding out werewolves exist, as do demons, oh and by the way several of your friends are werewolves and you're the only one who can exorcize a demon currently occupying your friend's body.

If Lydia wasn't freaking out just a little over that, Scott would be seriously worried for her sanity.

He trusts her to do this, though; trusts her implicitly. She may not always have been the best to Stiles, and there's little doubt in Scott's mind that she's never reciprocate on his crush, but when push comes to shove he knows that they can count on her to do this and do it right. She's ridiculously smart, and more compassionate that she lets on.

The plan is pretty simple, now that they're got the salt circle all set up. They planned it out so that it's a decently large circumference, primarily to try and avoid the demon noticing what they were doing. That was actually supposed to be the hard part.

Scott's not sure if the fact that the demon's too distracted in there to cotton on to their admittedly shaky execution is a very good thing or a very bad thing.

On the one hand, Stiles might be fighting back, or Derek might be distracting it…but on the other hand it could just be having too much fun slaughtering them both the care about whatever else is going on outside.

Scott desperately hopes for the former.

In any case, now that they've got their demon trapping circle all set up, the rest is pretty straight forward. They'll burst into the nurses' station, Lydia will start in with Exorcism #1 to get the demon out of Stiles' body, the demon then makes a run for it, becomes trapped by the salt, and they run after in hot pursuit. It can't fail.

Scott's favorite part of the plan is how Isaac is going to carry Lydia so that if/when they have to run after the demon she doesn't get too out of breath to say the exorcism, or stumble over any words. Scott himself came up with that, and feels mighty proud of it.

Lydia stops muttering, takes a deep breath. "I'm ready". They sneak up to the door, Lydia leading the charge…and slam it open, Lydia talking faster than she ever has in all her life.

Derek isn't sure how much more of this he can take.

The demon is walking Stiles around the room, opening cabinets at random and using whatever's inside on Stiles like he's a living pin cushion. He's currently sporting a syringe sticking out of his arm, some incredulous cartoon bandaids, and a splash of hydrogen peroxide that's making the cuts on his chest bubble and hiss.

At least they won't be getting infected. Of course, that won't help very much if he's dead. Derek is just praying that Scott gets back before the demon finds the cabinet with the pills in it.

And while watching the demon stick whatever it can find in or on Stiles is absolute agony and makes containing the wolf take every ounce of control Derek has, what's almost worse is what the demon is saying.

It's dredging up every memory Stiles has of Derek and describing them in detail. It ranges from Stiles oogling Derek's abs in his room to realizing he has a crush on him for the first time.

All of it is stuff Derek wants to hear, but not now. Not like this.

He wants to hear it whispered in his ear, soft and sleepy as they lie tangled in bed. Wants to hear it screamed in anger in the middle of a stupid fight. Wants it breathless in-between kisses, silent in a glance from across the room, in the feeling of fingers intertwined with his own and wet on a pair of lips.

At this point, Derek knows what the demon wants. It wants him to give himself up, to let it ride him and take control of the wolf. Of course, the demon doesn't have to ask, could just take him right now, but it doesn't.

Derek can only imagine that it's part of some sick game, getting him to, essentially, ask the demon to put the town to death, or worse. It wants him to beg it to possess him. It's sick and Derek can't, because he could cause so much damage, so much more than a normal human, and that's just what the demon wants.

He can't do it, he won't do it, and if he just tells himself that enough times maybe it will be enough…

All of a sudden there's a huge bang as the door bursts open, and Derek's pack, his pack, is suddenly crowding into the room.

It's color and noise and activity, and Lydia is there of all people, yelling a jumble of words so fast it makes Derek's head spin.

"Exorcizamus te, omnis immundus spiritus, omnis satanica potestas" she screams, and Stiles body starts to shake and twitch. After the last few hours, it's too sudden and too much, and Derek hides his head in his hands.

Which is a good thing, as it turns out, because all at once there's a blinding light and a terrible screeching sound, and when Derek looks up there's a gigantic cloud of black smoke streaming out the door, and Isaac scoops Lydia into his arms, what the hell, and they take off hell bent after the demon.

Leaving just Derek and Stiles in the mutilated nurses' station.

Stiles.

All at once Derek is on his feet, scrambling to where Stiles is crumpled unmoving on the floor. He's unconscious, and Derek takes the opportunity to yank the syringe out of him and grab the scalpel from his hand, throwing them across the room with so much force he's pretty sure they actually impale the drywall.

He gathers Stiles into his arms and tries to breathe.

Stiles' heartbeat is slow, so Derek immediately notices when it shoots up and starts going like a jack hammer.

"Hey, it's okay, I've got you. Scott came though, they're after it right now".

Stiles looks up at him with those huge brown eyes, and Derek sees trust blooming there. It affects him more than it should.

Stiles nods, accepting his words, and leans his head against Derek's chest with a groan.

Derek knows he should be getting up, getting Stiles out of here, but he has to know. Stiles almost said it earlier, but Derek stopped him, kissed him so he wouldn't say it. He wants to kiss him again, now, God he wants it, but first he has to know. Without the demon's influence, without the threat of imminent death. So he steels himself and asks.

"Was it true?"

"Stiles wiggles his nose into Derek's chest, like he can hide there. "What, the part about me admiring your abs, because I mean anyone…"

"Stiles."

"…yes", and it's small and embarrassed, scared and hopeless, and it's just so Stiles to not have confidence in the fact that Derek kissed him, that possibly he wants this too.

Derek tries another tactic. "There's a reason it didn't go for your torturing you in front of your dad, you know"

"Because you're more powerful. It wanted to control the wolf".

"Yes, it wanted me so that it could have destroyed…so much. It could have torn a hole in the world."

""Well then it's a good thing you didn't let it."

And here it is, the moment of truth. "I was about to."

Stiles' head snaps up, and he's glaring at Derek, and angry accusation on his kips, which is quickly replaced by confusion and then astonishment. "You…" and Stiles is on him, lips pressing in insistently and arms wrapped around his neck, and I's the best thing Derek's ever felt because they're not going to die, this isn't just last minute desperation, it's a start, a hope, a beginning.

Stiles is astonishingly enthusiastic for someone who's just undergone hours of bodily possession and torture, and Derek is losing himself in the building heat, in Stiles' soft lips and eager tongue, his long fingers which have somehow gotten down the back of Derek's shirt, and it's a real testament to how far gone he is that he doesn't hear the other arrive until someone clears their throat with obvious intent.

He breaks away from Stiles with a soft 'pop!' of their lips, and once again big brown eyes are staring up at him, dazed and lazy and happy. Derek really does need to get him to a hospital.

He turns his attention to the rest of his pack. Scott and Allison look unharmed, though out of breath, Erica is disheveled and has salt in her hair, and Isaac is just letting Lydia down from his arms. All of them are covered in a fine yellow dust and smell of rotting eggs.

Lydia has some black goo on her jacket and looks pleased as punch. She's also the only one who doesn't seem surprised to have caught Derek and Stiles making out in the middle of a blood splatter on the floor.

"That fucking rocked" she proclaims, as the others wilt around her. The smile on her face tell Derek that they're not going to be rid of her as easy as all that.

The look Stiles gives him says the same thing, and Derek can't help but lean in for another kiss.

Umm, could you not do that, with all the blood and the…yeah", Scott says, and Derek thinks that he actually may have a point.

So he scoops Stiles up, with only minimal protestations, and follows the others out into the night, trying to come to terms with the uncomfortable sensation that he owes Lydia Martin until the end of time.

The End