Mattheo is a typical bully; he defends his blood status, is cheeky to the professors, makes fun of everyone and everything, provokes every argument and gets into fights seemingly every day. Many girls would do anything for him, which he skillfully and willingly exploite.
Yn and Draco are enemies from the beginning; no one knows why, because they actually have quite a lot in common. Both are in Slytherin House, in their sixth year. Draco has only ever had feelings for women, but what is this feeling in his stomach when he argues with yn?