Derek stepped back, feeling awkward once more. "It would have been presumptuous to tell Isaac and Stiles before you'd agreed to stay here," he replied. "I'll tell them next. Alone, if possible. I'm not sure how they'll react. Isaac should be fine, but Stiles...." He trailed off, sighing. "I'm not sure how Stiles is going to react to his Master claiming his best friend," he admitted.