Tanaka's Daughter (Black Butler fanfic)

Yes you read right! Tanaka has a daughter! Since little age she has worked with her father for the Phantomhive family and Ciel loved her very much, she was very good at her job and was very appreciated by the Phantomhive family. But when she turned 13 her mother took her away from that life. Her mother was a professional assassin a very good one at that. She trained her daughter to be just like her. To be intelligent, to create strategies in her head in seconds, to be able to handle any gun, sword, or any weapon at all. Her mother created a prodigy. Soon after she turned 19 her mother died and she decided to go see her father and Ciel again.

What will happen then when a new girl comes and is as good as Sebastian? When she's grown to be a beautiful woman? When Sebastian starts having feelings for this girl? Read to find out!