Time Doesn't Wait

They didn't really notice Hadrian Moores at first, at least until he started getting between them and the Slytherins. What kind of Gryffindor was he? His best friend was Sirius' snake of a little brother for Merlin's sake! But that's not even the worst part. In other news, Harry goes back in time to stop what he can only describe as the end of the world. TimeTravel/AU