His.

Hogwarts is a University. Draco Malfoy hates Clara. She is a muggle born and a Slytherin. And it infuriates him. How kind and naive she is to everyone. How she never noticed how men look at her. He hates her. And everything about her. But then… Professor Snape makes Draco and Clara work together in a project. He is the best student at Potions. She is the worst.