Ok as you know JK left a huge hole in the potter series when she failed to mention anything about the dursleys after "Dursleys Departing". This is what i think went down.

After the sudden death of his Aunt and Uncle, Harry dicovers that Dudley Dursley will be joining him at Hogwarts for his 6th year. Has Dumbledore gone mad? How will Harry cope when his private life clashes with his social life? Co-writer wanted!