Mattheo Riddle is toxic, possessive, and manipulative — her and Mattheo are step brother and step sister. He’s a big player and gets with lots of girls but sees her differently even though he hides his yearning and need for her. He always twists things to make her feel like the problem. No one can know about the stolen glances, the secret touches, the way her heart races when he’s near. It’s forbidden, dangerous… and yet, impossible to stop.