Stay With Me (Black Butler Sebastian Fanfic)

(Cover art is not mine! I'm not sure who's it is, but it's amazing! I found it Spiteful_Crow's Tumblr page, so go there to see more art such as the cover!) A girl with eyes that change color depending on her mood; a very odd condition. As unique as it is, that's not the only special thing about Siren. She has a stron...