He noted her obvious discomfort and instantly felt bad. "Oh, hey." Derek held up a hand. "I'm not gonna tell anyone. I promise. I just thought it was cool. One minute, you're there, and the next, you know...like a firefly. There have been so many situations where I wished I could do that. I'm jealous, really."
Then, the vampire's brow furrowed and it was his turn to be confused, again. "Wait, undercover from what?"
Derek glanced from side to side, furtively, as if secret agents were at that moment descending upon them. But no, that was just his normal evening paranoia.