Fraternal Enemies (not official title)

This is a story about fraternal twins that were separated due to the death of their parents. It takes place when the girls are training in a war against vampires and witches. Ivy, one of the twins took from her mothers side. She is a vampire. She does have some witch blood in her though. Luna, the other twin took from her father and is a half and half witch, she has half black (evil) magic and white (good) magic in her. she also has super speed and strength.