Y/N , Harry’s secret sister is completely different from his brother , she’s a Slytherin who grew up in a riche wizardry family, separated from Harry, she’s haughty and spoiled. At her 19 Dumbledore finally break the silence and decided to revealed to harry and her that they’re siblings it was supposed to stay a secret until Draco Malfoy, y/n’s enemies discovered it , how’s he gonna react after that ?