Here is when the students become the teachers. Harry, Ron, Hermione, and Malfoy are friends and work together. Harry works as the "Defense Against the Dark Arts" teacher. Hermione teaches "Potions". Ron teaches "Care of Magical Creatures". Last but not least Malfoy is the head master of the Hogwarts. These four new Hogwarts staff will have to put what they learned to save the ancient school from Voldemorts son.