In Any Version of Reality
Standing next to not-Derek – whoa, holding not-Derek’s hand? – is someone who looks remarkably like Stiles. Is Stiles, a slightly-altered replica, just like this guy both is and isn't Derek.
It’s not like looking into a mirror – one, because looking into a mirror actually makes some kind of sense, and two, because not-Stiles looks older too, mid twenties maybe. And the tips of his short, spiky hair are dark purple, and he’s got a lip ring and he’s shirtless and covered in tattoos and what the holy hell?
“Time travel?" He's sufficiently freaked. Somewhere in the back of his mind, he hears his dad laughing.
“Not exactly,” not-Derek says, and shit, even his voice sounds exactly the same, disconcertingly gentle. He gestures behind him, and Stiles looks over his shoulder, where behind him, scattered across the porch and in the front yard, are more…Dereks and more Stileses.
Fourteen total, including the two at the door, he notes distantly, eyes feeling like they’re about to pop out of his head from bulging so hard.
Seven other Dereks. Seven other Stileses.
Seven Derek and Stiles pairs.