Luciana Avery Castor is Finny's sister (no duh). He invited you to stay with them without telling Ciel. How will he react when he sees a cute blonde girl at the foot of the mansion. (dun dun duuuuuuunnnnn!) its more than just that... DRAMA SECRETS AND MORE YEAH!😛. Not an x reader !!!!! Anymore I don't own Black Butler. I own the plot and Lucy. That's it.