Theodore Nott has one rule: his best friend can have anything he wants. Just not his sister. Mattheo Riddle has always respected that line — until this year. Because she’s not a kid anymore. And he can’t stop looking at her like she’s something forbidden.
Y/N’s summer changes the moment her mother marries the father of Mattheo Riddle. New house. New family. And a stepbrother who clearly wishes she wasn’t there. Mattheo is cold, sarcastic, and impossible to ignore. Living under the same roof turns every moment into a quiet battle of tension and sharp words. But the line between hatred and something else is thinner than either of them expected.