Heart of Mine : Black Butler AU

A black butler AU where we focus mainly on the sister of ciel phantomhive.

After the death of their parents and the torture they endured during their enslavement from a cult, Ciel made it his mission to make sure his sister (y/n) didn't remember a thing.
Once he employed Sebastian he instructed the demon to erase (y/n)'s memory of the nights they spent tied up in a cage and leered at by perverse men.
Through the years the demon has kept a close eye on the siblings, more so the way Ciel's affections have changed for (y/n).

Even the young Earl is unaware of his own abnormal feelings for his beloved sister. His upcoming marriage to Elizabeth has these feelings arising.

Relationships:
Ciel Phantomhive/Reader, Elizabeth Midford/Ciel Phantomhive/Reader,
Sebastian Michaelis/Reader, Elizabeth Midford/Ciel Phantomhive, Ciel
Phantomhive/Reader/Sebastian Michaelis, Edward Midford/Reader
Characters:
Reader, Ciel Phantomhive, Sebastian Michaelis, Elizabeth Midford,
Paula (Kuroshitsuji), Finnian (Kuroshitsuji), Mey-Rin (Kuroshitsuji),
Baldroy (Kuroshitsuji), Tanaka (Kuroshitsuji), Francis Midford, Alexis
Leon Midford, Edward Midford, Soma Asman Kadar, Agni
(Kuroshitsuji)
Additional Tags:
Reader-Insert, Sibling Incest, Incest, Brother/Sister Incest,
Implied/Referenced Rape/Non-con, Implied/Referenced Torture, Torture,
Childhood Trauma, Forbidden Love, Denial of Feelings, Emotional
Hurt/Comfort, Arranged Marriage, Marriage, Wedding Planning,
Suspicions, Comfort Sex, possibly, We'll see how I feel, things are still
up in the air with this story, Aged-Up Character(s), Jealous Ciel
Phantomhive, One-Sided Attraction, Nightmares, Memory Loss,
Memory Alteration, Love Triangles, Post-Traumatic Stress Disorder -
PTSD, Cousin Incest, Abduction, Kidnapping, Can I still use the term
kidnapped if the character isn't technically a kid anymore??, Sacrifice,
Self-Sacrifice, Demonic Possession, Demon Summoning,
Demon/Human Relationships, Forgiveness, Acceptance, whenever i see or hear
the word forgiveness the hamilton trash part of me whisper 'can you
imagine?', Original Character(s)