Harry Potter and the Rotfang Conspiracy

During the summer before his sixth year, Harry reflects on the death of his Godfather, Sirius Black, and decides that it's time to fight back. If it's war Voldemort wants, it's war he will get! (Assuming Harry's raging teenage hormones don't distract him, that is.) A novel-length re-write of Half-Blood Prince with plenty of humour. Independent!Harry. Proactive!Harry. Honks.