Ten years ago, Slytherin lost their little sister. She didn’t disappear, they all graduated and, honestly forgot about the muggle mattheo would sneak in. Mattheo Riddle’s younger sister was the one person who made the darkest house at Hogwarts feel like home. A muggle surrounded by pureblood heirs, she never cared about names, blood status, or family expectations. She saw Draco, Mattheo, Theo, Blaise, and Pansy as nothing more than boys who needed someone to remind them they were human. Then she was gone. Years passed. The boys grew up, carrying the weight of their families and the mistakes they were expected to make. Draco Malfoy convinced himself he had forgotten the little girl who used to tug on his sleeve and demand piggyback rides. Until Mattheo’s wedding. She returns after a decade, no magic, no fear, and the same warmth they all remembered. But Draco quickly realizes she isn’t the little sister he once protected. She’s the woman who makes him question everything he was raised to believe. In a world obsessed with blood purity, Draco must choose between the legacy forced upon him and the person who showed him there was something worth fighting for. Because the most dangerous thing about falling in love with Mattheo Riddle’s muggle sister… is that she has no idea she already changed his entire world.