Derek Hale.

You are Stiles Stilinski's sister, you are currently 20 years old, a few years ago, you went to another state to study, and now you decided to unexpectedly return because you missed your brother and father. Now you quietly entered the house, hearing the noise in the hall, you went there, but immediately froze from this picture. There were people unknown to her, the only ones she knew were Stiles and Scott.

Derek sat with the others until he heard a scream.