[Princess]
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The MC reincarnates as a side character in a novel she read. As the princess, she does her best to change the fate of those around her. This plan goes into motion when she is kidnapped by the King of a neighbouring country in her sister's stead. He is the future villain's father. In order to stop his death from his unborn son, she plans on marrying him instead. The Villainess is a Dark Mage who sold her soul to a God in order to get revenge on the King and purge all Pure Mages, like the King.
Seduce the Villain's Father