Mattheo Riddle steps back into Hogwarts after two years of rot and cold in Azkaban, harder, colder, and carrying a darkness that has only deepened—yet every whisper and burning gaze lands not on him, but on Y/N: his ex, the undisputed queen of Slytherin, sharp-blooded and unyielding, who carved her own power while he was locked away. They were always two sides of the same venomous coin—equally brilliant, equally ruthless, equally hungry—and time did not erase that fire, only let it smolder into something sharper. When his eyes lock onto hers and he moves through the silence like a storm, the air crackles with old rage, unresolved longing, and the dangerous truth that neither has ever truly let go; she meets him without flinching, knowing he is not the same boy she lost, and he sees in her a strength that outmatches even his own, leaving them both standing on the edge of something volatile—where love and hate, power and possession, twist together like poison ivy, ready to burn everything in their path.