Harry Potter is in his third year at Hogwarts. The good news: Professor S. A. Black, the best Defense Against the Dark Arts professor yet, who teaches his classes to duel, puts Malfoy in detention, and helps Harry to fight against the dementors. The bad news: those dementors have arrived at Hogwarts to guard the castle against Remus Lupin, a werewolf and an escaped prisoner from Azkaban famous for killing thirteen people with one curse, who wrote Harry's name in blood on the walls of his cell. It's a year full of questions. Is Lupin using blood magic on Harry - and why are all the books on blood magic missing from the Hogwarts library? Why is Black up in the middle of the night desperate to see the Mirror of Erised? Who is the mysterious "Astrophil", author of an unaddressed love letter that Crookshanks found? And, of course, the most important question of all if your name is Oliver Wood: is Gryffindor going to win the Quidditch Cup?
"Another Professor, Another Professor" is the first in a series of five planned alternate universe fics, which will take Harry all the way through his seventeenth year. More than "PoA with Sirius and Remus's names switched", as its first readers feared it would be upon hearing the premise, it has its own unique plot and was Niffled by the FictionAlley Nifflers.