God of the Underworld

SS cannot have liabilities as a spy or stomach upheaval in Slytherin with DEs watching. When Dumbledore saddles him with a student whose actions hit close to home, will he be able to (or care to) prevent the inevitable? Will the boy expelled from Scyon Academy curse Draco Malfoy to the hospital wing or unleash Dark Arts on Lupin?Both?Voldemort later!AU HBP-DH.