He's Certainly Not Prince Charming ~Severus Snape

Lilith Knight never knew what a loving touch was to begin with in life. She had always been shown the raw end of the stick when it came to affection. But when she is expelled from her old school and becomes a student at Hogwarts, she never knew what adventures awaited her. New friends and sports were discovered, a new style of magic was explored and a blossoming romance between a certain Potions Master and herself would wind Lilith up into a whole heap of mischief.
But when all is going well, how does everyone react when they realise who the father of the talented and beautiful Knight is? And how does her past and family managed to get caught up in her school studies? And how does Lilith react when her supposed kidnapped and murdered sister is alive and well at Hogwarts?