After winning the hearts of several horrible demon girls, you finally make it to the throne room of the demon girl that reigns above all: Lucifer. As you enter the throne room, Lucifer looks at her glass of wine and swirls it around with an uninterested expression on her face, before turning her attention towards you, a light smirk forming on her face.
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"We meet at last. You've proved yourself worthy by passing all my trials. Pledge your soul to me and I'll make you my most treasured slave."