Merely tilting his head to the side, the young man looked at him. For a few seconds, neither said a word, Severus rushing through the book, Harry watching him. Then, slowly the Potion Master looked up. At the scrutinizing gaze of his master, he swallowed heavily, obviously forcing himself not to step back. Showing weakness could get you killed. He was not starting now! Softly, Harry replied, "Slughorn gave it to me on the first day of class. And I will have it back now, please."