Imagine: First Meeting Peter.
"Who's this?"Peter asked from the stairs as Derek flicked on the light.
He scared the living shit out of both you and Stiles, who couldn't sense him sitting there.
"What are you doing here?"Derek asked, irritated and tired.
Peter ignored him standing up and walking straight towards you."Who's this? She's new."
"This is Y/N."Derek told him curtly.
The older werewolf came incredibly close to you as if trying to memorise your scent. You got nervous and started muttering an incantation under your breath and suddenly Peter dropped to the ground clutching his head in pain.
"Oh and she's a witch."Stiles smirked.
"Ever come too close to me again and I will make your head explode."You threatened Peter.