His name is Derek Hale. He has lived in the neighbourhood for centuries. He had a dark secret that nobody knows though. He was a werewolf but not just any kind of werewolf he was a beta. Everyone knows him since he is cold hearted, mean and protective sometimes

You were the sister of Scott McCall who is a alpha and you a omega. You both know about Derek. You were working at a late night shift in the pet shelter when all of a sudden Scott and Derek was limping

Scott: tweezers now!