Draco's angry sneer flattened a little. If she knew, this would be a bit harder to talk his way out of. Not that he cared that much about serving detention, and at this point House Points were the least of his problems. It was just infuriating to be caught by her.
His cousin, indeed.
"I suppose I lost track of time, then," he said sourly, and it took a moment for him to understand what on earth she meant about something pressing against her bladder. When he did, the look of disgust that flashed on his features was quick, but honest, and then it was schooled away. "Yes," he said after a moment, "I hear those bezoars can be quite painful. I suggest you stop eating your hair."