Derek let out a low, frustrated sound. "I know," he replied, quietly. "Look. I agreed that you could take some time and be excused from the main house, despite the fact that it's completely unreasonable. I guess I can't expect you to be happy about this, but I meant it when I said I won't tolerate you making Allison feel like she doesn't belong here. She was your friend, Stiles. That's why she's still here, despite what you might think."