Jealous step-sister

( I don't know what I'm doing.) You are a baby named Olivia. Your mom has died due to a demon attack, and your dad has left. But the demon king himself saw you and saved you from freezing to death in the mountains. The demon queen doesn't like that her husband brought home a random baby from the mountains. But the king convinces the queen to let you stay as their child. Will you grow up to be the most powerful demon queen, or will your new big sister convince your new parents to leave you to die? Let's find out together.