Charming, credible and inventive. I loved the incurable mutual detestation between Sirius and Snape, and thank God you didn't try to suggest any possible reconciliation or mutual understanding - if the two, as adults, hate each other so much that both of them put the common cause in danger for the sake of their hatred, what chance would there be of their as adolescents seeing any sense? And the historical allusions were a delight - speaking as a historian.