The Everlasting Dream (Black Butler)

Caroline Sears is the highly trained assassin for the French Mafia until a certain demonic butler with a voice like velvet comes along and offers her a deal: work as Ciel Phantomhive's bodyguard. She takes up the offer, standing as the determined young adult she is, knowing it's a rough trade. Some people have stated that her attributes make her not fully human-like, and she possesses some demonic, darker skills that not a normal human would be able to possess.

As she stands, she must protect Ciel with her life, until the day of his death. But someone has their eye on her, because something isn't that right to him, either. Caroline is too skilled to be just a human, so what secrets are hidden from the public, from all the world to see?

(Disclaimer: It's probably pretty obvious, but I don't own Black Butler/Kuroshitsuji or any characters contained in this apart from Caroline Sears and her family/relatives. All rights of Black Butler/Kuroshitsuji go to Yana Toboso, and if I did own Black Butler, Sebastian would be fangirling over the kittens much more than he usually does.)

"After all, if I couldn't do this much, what kind of bodyguard would I be?" - Caroline Sears' top-notch, Sebastian-style quote.

(Cover drawn and created by me for references, my hand still aches from drawing by hand.) (Entered in the Kuro Watty Awards and Anime Wattys under the category of Black Butler, no duh.)