Everyone knows the story of the boy who lived. What they don't know is that he had a twin sister who shared half his blood. Severus Snape has always loved Lily Evans, but she chose James Potter. One night, after a big fight with James, Lily found comfort in the arms of Severus. Later, Lily finds out she is pregnant with twins. Feeling guilty, Lily confesses to James about the night with Severus. James demands a DNA test, but the results were shocking. The twins had seperate fathers. As a solution, Severus and the Potters decide to separate the twins. The Potters will raise the boy, who they named Harry. Severus raised his daughter, who he named Svetlana. Svetlana always knew who her mother was. She new about Harry Potter. What would happen if they attend Hogwarts together? Would she embrace her twin or will she share her father's feelings of Potter men?