Pumblechook

'Expecto Patronum!' Professor Lupin cast at the Dementor on the Hogwarts Express - and so begins the tale of Pumblechook.
Left powerless and alone, his Dementor powers gone, he can only rely on the good will of others. Professor Snape and Hermione Granger must work together, for the good of the Order, to get the last loyal Dementor back to full strength in their battle against Lord Voldemort. A comedy set during HBP. Canon compliant.