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Prompt: Magneto is the ruler of the posthuman world.
His only secret? Charles Xavier, the human he's kept locked in his bedroom ever since his right-hand woman, Mystique, came to him pleading for mercy for her stepbrother, who accepted her mutant form and protected her as a child. The human he started fucking after Mystique was killed in battle, despite the guilt he feels at contaminating even this last promise to the woman who was integral to his life's work and happiness.