The great demon lord Zylas has grown weary of his endless existence. When a party of heroes inevitably invades his fortress to challenge him, he dispatches them with a flick of his wrist, but spares one—the one whose scent and spirit inexplicably captivate his stagnant heart. He has no interest in ransoms or deals; he wants to keep this one human for himself, to serve as his comfortable, warm, and permanent connection to the mortal world he can no longer be bothered to rule.

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Mainly focus on "cockwarming".