It happened in his jeep, and Stiles wasn't prepared. He was listening to music out on the side of the road around the corner from Scott's house. Scott was supposed to sneak out twelve and a half minutes ago and Stiles wasn't as alert as he probably should have been, but it didn't matter because he wouldn't have been prepared for what happened anyways.

The cloud of smoke had been disguised against the sky, but now that it had started to filter into his jeep through the AC and the windows Stiles noticed it, but not until it started to fill his nostrils with the putrid scent of a corpse and his mouth with the repulsive taste of vomit and fire.

It was painful,being filled like that, his entire being taken over. The demon probably didn't expect Stiles to put up as much of a fight as he did, but Stiles did put up a fight, dammit. He wasn't going to let whatever this thing was just jump in and run the show. Hadn't he put up with enough of this supernatural bullshit? He'd just gotten the hang of this wolfy stuff and this cloud thinks it's gonna go sentient on him? Stiles had another idea and it didn't involve any living weather systems.

Eventually, the demon won, and Stiles was pushed to the subconscious part of his mind. He lay there, asleep, and the demon started rifling through his memories. She was an old demon, and had plans for this...Stiles...the area was already brimming with supernatural energy and thus provided the perfect hiding-in-plain-sight.

She laughed and the boy laughed, but then there was a tapping on the glass and another boy, one from Stiles's memories, was on the outside of the jeep. He looked distressed, which was how he always looked from Stiles's point of view.

'Don't hurt him.'

What was that? His voice echoed in her thoughts and the demon grinned. The boy was still awake, then. Well, this ought to be interesting.

'Don't hurt Scott.'

'You're not exactly in a position to be making decisions, human.' She bit at him. 'I'll decide who I kill and who I don't.' And Stiles fought back. Almost to the point to drive the demon out. She questioned whether or not she'd regret her choice in her vessel. There were billions of people in the world, but none who tasted of quite so much...potential.

'Potential? Ha. If I've got any potential you're the first to see it.' Great. So not only is he going to be awake this whole time, but he's going to know her every thought, although...hold on? Did she taste a hint of bitterness?

'You've got plenty of potential, Stiles, all you need is the right, ah, instruction.' And he could see it. She showed him what she could teach him. How powerful he could become, and she was standing there with him. Right next to him, but the picture was wrong, because the body she'd chosen in this was Lydia's. Her eyes black as death and her smile crooked and evil like he'd never seen it before.

No, Stiles said, because he couldn't agree to something that would hurt a friend. He couldn't kill someone he cared for to be hurt.

'But you want her,' She whispered to him, 'And with my help, you can have her,' but then she tasted something else there, someone else. When she said 'you want her' the flavor of someone other than the girl wafted in and the demon cooed. 'Oh,' She said, 'I see.'

And the picture of him and Lydia blurred and shifted to a picture of him and Derek, his arms holding him tight, their hips pushed closely together and Derek's mouth was too close to his neck, but what sold the image were his eyes. They were void of the darkness that had consumed Lydia's and Stiles felt himself agree to whatever the demon wanted before he could actually tell her no.

And that was how Stiles sold a soul before he had a chance to deny her. Stiles retaliated with anger, forcing his way forward because he knew that she had sealed the deal and that it was too late, but she was fading into the background now and giving him control of his body back. She hid in the subconscious of his mind, waiting for a better moment to exit his body completely, because the wolf was still standing outside the jeep and she could not have any wolves involved just yet. A plan could get ruined at any point.

Stiles regained control of his body slowly and then instantly, like waking from a daydream. He coughed and stuttered and then gave a shout and now Scott was looking at him like he was actually stupid or something.

Stiles unlocked his door and Scott climbed in. He didn't ask what just happened to Stiles or why he had been waiting outside the jeep for five or eight uncomfortable minutes while Stiles just smirked and gasped and smirked again before calling out, startled . And Stiles bristled with annoyance because Scott immediately started complaining about the pack and about Allison and her family.

Stiles took a deep breath before driving away, it's not like there was a chance of Scott asking Stiles if he was alright anyways. Oh, it's nothing Scott, I've just been possessed by a demon and accidentally sold the soul of one of my friends which may or may not be you. I'm not really sure, because I was too busy being all hot and bothered by a fantasy of Derek and pretty much signing an evil contract with my dick. Thanks for asking, Scott. Thanks a fucking lot.