Sister of the Earl

'She giggles. "As you may have noticed," Rose says, grinning, "I'm not all here.'

Rosalyn Phantomhive's parents died when she was thirteen leaving her with one of her only living kin: her younger brother, Ciel.
Driven by her hatred, she formed a contract with an icy blond demon named Lucifer. He is bound to be her butler....until the fateful day he ends up eating her soul as the contract's goal is fulfilled: when Rose gets her revenge on her parent's murderers.
But when she appears on the doorstep of their newly rebuilt mansion, two years after the accident to find the brother she abandoned for the Snakes (also known as the Queen's loyal assassin's), Rose discovers that Ciel has a new butler: a man with matching red eyes to those of Lucifer, named Sebastian Michaelis.