The Phantomhive Experiment

Sebastian + Reader:

(Y/N) Phantomhive, Ciels forgotten sister, a sister that would like to stay forgotten. But unfortunately that's not how fate works.

You were the elder sister of Ciel Phantomhive and like him you were also stolen away the night of the fire and sold off to the highest bidder. Unlike him you weren't sold to a cult and instead sold to a group of scientists that experimented on humans. For years your were tortured and experimented on until you were able to escape, but with some pretty interesting abilities, abilities that helped you get out of that hell and survive on your own.

Once out you were so happy to find out your younger brother had also escaped from his version of hell. You wanted to go back, but he couldn't remember you, you could tell that from the papers that headlined his name. So you stayed away, after all you had your own demons to chase down and eliminate.

However, a stray photo found by Sebastian soon meant that you couldn't stay away much longer.

(This doesn't follow the Black Butler storyline)
(This is also not a book 2 to my other Black Butler fanfic, that one is coming later)

Warnings: bad language, mentions of blood, violence

-I don't own the Black Butler characters