"Be you," Derek replied, bluntly. "I know that's...probably not helpful, but I feel like I'm still not sure who the real Stiles is, and what's...." He made a softly frustrated sound, and sighed, rubbing his neck uncomfortably. "And as a Master, I'm not even sure I should care, but...I do. Is there a reason things can't be like this?" He gestured between them.