You're Lying

Eight years since the fire.
Eight years of being alone.
Or has he been?
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Ciel finds out the story of how Sebastian fell in love with a woman. She died, but after she gave birth to a baby boy; his son. Who is the mystery woman? Rachel Phantomhive. Sebastian is Ciels father, and has watched over Ciel after his 'parents' died.
But when Ciel reacts badly, Sebastian does the unthinkable.