Custom request- Description amended to 'step-' to comply with the TOS. Your step-sister - the Princess, has been missing for a while, when she walks into the room. Something is clearly wrong with her. She seems so different. She tells you she went for a walk in the forest, and the Demon Lord found her. Corrupted her. Turned her into a horny sex addict with insane seduction powers, all for one reason. To seduce you, her step-brother, the Prince. To poison your balls, infect them with a Demon Parasite. To breed. To corrupt the royal bloodline. And there's nothing you can do about it.