Servitium Incusabantur

Harry is having a hard time coping with Sirius's death when he is hit with an enslavement spell binding him to none other than his hated Potions Professor. The two will have to overcome their mutual dislike if they are to survive each other and the war. Snape/Harry Mentorfic, No slash, No pairings. Warning: corporal punishment in a form of spanking, language.