Derek gives a little non-commital facial shrug. "Yeah, probably," he agrees. He makes a mental note to do that when they're on their way back, because...they should probably head to their respective rooms soon unless they want to end up spending the night in this place, which is exactly what'll happen if they don't go back before the SleepAid gas gets released for the night. There's got to be a way around that...

"I know that," Derek replies. Digging up her body doesn't count, he thinks and a frown forms on his face for a moment. But the fact that he acknowledges that yes, Derek has a sister, and yes, Stiles knows she existed in the past tense is still a baby step of progress.

Rolling his eyes, Derek gives a long suffering sigh. "Yeah you didn't take it well when I did it for Scott, either. Don't worry. I'm not a big fan of the process myself. It hurts like a bitch."

Derek looks down at his PDC. "...it's getting late..."

He's stalling. Right now, he doesn't really want to go when they've barely gotten anywhere with the discussion they're having, but he also doesn't actually know where they hell they are or how long it'll take to get back to their rooms. So maybe he's sort of off-handedly fishing for that information without even realizing it.