Harry Potter is entering his 6th year at Hogwarts, but it isn't quite the same Hogwarts as you might remember. Harry Potter is just another boy. Voldemort was defeated before he was even born - dead and gone forever. He was raised by his parents in a loving home. The curse on the DADA position was lifted when Voldemort died, and for several years now Remus Lupin has been teaching the class.
In this 'happy end', who know what will come up. Perhaps another rise of pure blood supremacists, or those who wish to reveal their community to the muggle born. Perhaps even an anti-pureblood movement. What happens is completely up to you!