Oh! I'll make you laugh

Severus had decided, long ago to keep leading his life just the way it was; inside Hogwarts scaring students. Until she came. Then everything began unravelling. Oh! How he hated her easy smile and playful eyes. All he had to do was stay away from her, least her habits begin spreading to him too. But why does she have to be so powerful, intelligent and charming? Life is so unfair!