Blackboards and Broomsticks

At twenty-five, Harry Potter is at a crossroads in his life. He's achieved his dream of being an Auror, but it's not all it's cracked up to be, and with one child and another on the way, he's missing out on precious time with his family. But being an Auror is all he knows how to do - right?
So he's in for a surprise when Professor McGonagall, Headmistress of Hogwarts, offers him a job as the new Defence Against the Dark Arts teacher ...