Ms. A had turquoise eyes that could shatter you. They were big and obedient and told her story of willed submission in a way that no porno flick could ever entail. She was there for you, to guide you, to confuse you, to call yourself into question just when you thought you understood what it was you were doing and why you were doing it. "You don't even know how much you don't know," she would say, and she would be right.