Book of Disgrace (Sebastian x OC)

Raven Phantomhive, older sister of Ciel, is left taking care of him after their family's tragic incident, having an ambivalent relationship with Sebastian, their butler. Their relationship, based on fear and desire, is a forbidden one, as Raven is already betrothed to Edward Midford. Knowing she will not be alive to see their days of getting old, however, she finds escape in the butler's arms. Like this, she is forced to continue navigating through this long and menacing road, one she never would have chosen.

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Based on the manga

Major spoilers

I will be writing the story in a non-linear way. The first published chapter is the first in the timeline as well, after that I will always indicate which arc the story takes place in. It should make sense that way too, as long as the reader is familiar with the manga and keeps in mind that the timeline is the same, I just publish it in a different order.