Derek put his face in his hands. How did he handle this? Tell the truth and...well Stiles already seemed to be freaking out but freak him out more? Or lie and lose his trust? He seemed to be one of the only ones Stiles trusted these days and the boy did not need to lose anyone who knew about what had happened. "I - " he said, then sighed. "I'm going to have to make a list of everything that you can't tell people, apparently. This will be at the top: you can't tell. Anyone. Ever. This is a huge secret that only the teachers and the Bureau know. So you can't breathe a word of it. I'd lose my job, at the very least."