She doesn't understand why he's embarrassed but she's grinning at him, loving the fact that he is.

"How would a vampire test that? Get all coked out on a fairy and then run out into the first crack of dawn?" A pause as she reflects on all the drugs she's taken, or seen others take. "Actually, I guess I could see that. ...I'm guessing you haven't bitten one? Or does the sunlight thing only work for a little while?"