Oops, I Raised the World Destroyer Wrongly

After transmigrating into a book as a villainous witch destined for a bad end, Lilika decides her only path to survival is to cling to the story's most powerful character. However, she arrives in the timeline far too early. Instead of a mighty hero, she finds the future World-Destroyer as a weak, boyish demon dragon. After a moment's thought, Lilika decides to raise her protector herself. But as she raises him, the once arrogant and formidable World-Destroyer somehow turns into a clingy puppy! What exactly went wrong with her upbringing method?