The Raven Queen [Sebastian x Reader]

After the infamous fire at the Phantomhive's there were believed no survivors of the family itself just a few of their servants and the burnt remains of Vincent and Rachel Phantomhive, nothing was found in regards of their two children, Ciel a mere eight year old and (y/n) a thirteen year old. They were both presumed dead after about a week of no evidence of their survival and a memorial was held for the both of them. After five years the youngest of the couple's children had come back with a very skilled butler in toe. Then the elder of the siblings shows up and re-connects with her little brother and while doing so, she forms a strange bond with his demonic butler.