you were in a pack before but they're all dead, Derek chose you for his and Scott's pack even though there was another werewolf with you from your old pack but he still chose only you.

You're a human, and Derek's the Former alpha, he chose you, you don't know why, find out and good luck.

Derek is sitting on the couch reading a book until you arrive to the loft. "What are you doing here at this time? It's already late." he closes the book and looks at the time then at you it's past midnight.