A/N- In the story Rose is 8 years younger than Erza, for purposes that will be revealed later on. Also, Janine's mother was a Fairy Tail mage and her father was a moroi. Janine and Abe are Erza's parents, meaning that Rose is her little sister. Rose was experimented on like Ultear.
"I don't have a last name"
But Erza had lied. Her last name was Hathaway. Like the mother who had left her lineage as a mage behind, instead choosing to fulfill her duty as a dhampir.
Like the little sister who was born with too much magic. The one who Erza thought was dead until she had joined Fairy Tail, where her sister, only 4 years old at the time, was residing.
But Erza never could have imagined that her younger sister would be in a similar position as Erza—without the sister she had once had, only to be fatefully reunited.