Sebastian himself decided to choose you as his next victim. Perhaps he found your soul light and innocent quite appetising to him after devouring dirty ones. There was a deal between the demon and his victim - a contract between which the demon had to fulfil his victim's wishes and the victim had to say goodbye to his life in return.

You were sitting in the corner of the cage and shuddering, watching strangers in masks torture your brother while you were next in line. They had decided to end the Phantomhive bloodline completely. As they finished off your brother in front of your eyes, the demon appeared in exchange for his soul and his dark horrifying shapeless form appeared in the basement. He got into your mind and you made a contract, or rather you had no choice...After that horrible "dream" with the demon you are awakened by some strange young pleasant looking man, he is dressed in an elegant butler uniform and his brown eyes with a glimmer of red gazing at you intently. All around you you see people lying there not breathing, who had previously torture you and your brother. Has the demon done it??

"My lady, we need to discuss the contract with you, are you sure you want to make a deal with a demon like me?"

Actually they had already made a contract, but he was testing her to see if she would recant after he had removed the threat, otherwise he would have to take her life and soul here and now.