AU where Stiles and Lydia go out of town to do some research on the Darach.
Stopping at a local roadside store, they notice the guy behind the counter looks a lot like one Derek Hale.
Not wanting to give anything away, they ask for directions to the nearest hotel and as night falls, Stiles nods off at the wheel almost killing them.
When the same guy from the store eerily runs out of the forest to see if they are all right, Stiles decides its time to call Derek.
Derek is not happy.
"Do not freaking MOVE from that spot, Stiles. And tell other me not to move either.”
Derek joins them in an amount of time that has Lydia checking her watch and rolling her eyes, especially since he just ran out of the woods and not up the road, in a car, like a person.
"Stiles," he says, before he’s properly reached them. “Where—" He stops short, eyes going wide, then abruptly narrow, at the figure over Stiles’s shoulder.
"Yeah, we thought we’d better tie him…" Stiles trails off when he turns, because the Derek doppelganger appears to have been replaced.
By a Stiles doppelganger.
It’s not a perfect match — a little younger, maybe, his hair a little longer, he’d never wear a t-shirt that tight — just different enough that Stiles’s brain is trying to convince him that it’s a coincidence, just two strangers who look unusually alike.
Then the guy looks down at himself and starts laughing.
"Oh, this is too good," he drawls in Stiles’s voice, looking between the two of them with a smirk Stiles immediately resolves to practice in the mirror when he gets home. "Both of you?”
Derek’s on him in an instant, shoving not-Stiles up against the car — though Stiles can’t help but notice that he forgoes the claws, which is a strange show of gentility coming from Derek. “What are you,” he grits out, eyes flashing.
"This is the stupidest thing that’s ever happened to me," Lydia snaps from beside them. “Did you pick your power from tvtropes?”
Not-Stiles laughs again. Actual-Stiles gapes. “You know about tvtropes?”
"I know everything." Lydia tosses her hair. “So, what is it? Unrequited love? Heart’s desire?"
"The person they want to see most, technically," not-Stiles says. He gazes at Derek with a dark-eyed smirk, tilting his head back and to the side in a way that makes Stiles fidget and Derek recoil, growling. The creature snickers. “Though there’s some overlap. Mostly I do a lot of celebrities."
Derek is looking at Stiles, now. Stiles swallows, avoids his gaze. “Look, there was a supernatural thing, and I called you first, just like I’m supposed to,” he says quickly. “Let’s not worry about the why—”
"Stiles." Derek’s voice is… strange. Intense. Stiles immediately forgets what he was saying.
"You seriously have to do this now?" That’s it, Lydia is not invited on any more road trips. She sighs, grabbing the loose end of the rope they used to tie the doppelganger’s hands. “Come on, Mr. Monster, let’s go for a walk."
"Lydia, you can’t just—"
"Relax," she says breezily, “I’m not going to untie him." She reaches up, snapping her fingers in front of the creature’s face. “Ryan Gosling. Hurry up, I haven’t got all night."