I Am the Last Villainess He Has to Kill

When people get transported into novels, they usually end up as noble ladies, even if they're villains. But I ended up as the final monster that the male lead must killthe daughter of the Demon King."Here's your favorite finger necklace, Princess!"Abduction and murder are the norm among demons. I can't live with these creatures for 5,000 years! I just need to endure it, fulfill my role according to the original story, and move on to the next novel! Oh, G**. How is this even possible? This isn't some stray cat adoption; it's like adopting the male lead! And the eight-year-old Kiel is saying some very ominous things."Can I eat you?""Well... I'll raise you with care, so come kill the Demon King's daughter later."