Sebby's Little Sister

After being apart for a hundred years Ankoku runs into her big brother Sebastian, she has been searching for him for quite a while and has finally found him. With the newest arrival, Ciel must try and keep this odd girl away from the pesky Alois. Something is indeed peculiar about her and they both want to find out. With Sebastian already known to the fact of his sister's nature he decides to sit back and watch, that is until a certain otherworldly creature decides to set his lustful gaze upon Koku...Is there more to Ankoku than meets the eye? What do you think could happen in this wicked story? Read to find out
* I DO NOT OWN BLACK BUTLER, ONLY MY OC'S, ALL RIGHTS GO TO THE ORIGINAL OWNERS/CREATORS* Thanks xD