"Oh," Derek says, blinking in surprise. That isn't really what he was expecting Bitty to ask, and he smiles and shrugs one shoulder. "Bitty, that's fine. You can tell him. I really appreciate you asking, but I wouldn't make you keep that from him."

He's a lot more open about being a werewolf here, so it's no trouble to let Bitty tell someone important to him about Derek's secret. It does mean a lot to him that Bitty asked permission, and he smiles at him fondly. "Besides, he's sort of pack by proxy."