Voldemorts Daughter and The Potions Master

Severus Snape, the supposable 'heartless batlike git who has no emtions'. A girl who has been abused all her life by so many people and now herself. Draco Malfoy who falls for her and twins who only hope to show this girl the light. Who can save this girl from plunging herself into darknesss? From following the ways of He-who-must-not-be-named? Who can stop her becoming her own and the known worlds worst enemy? And how will she save the soul of the one man she loves, the innocent girl who possesses her body and the great Professor Dumbledore himself?