you were a Hogwarts student in Slytherin, and at the start if the fourth year, you got the information you're changing dorms. Although, you weren't expecting that.

when you arrive at "your" dorm, you know your roommate should be there. You weren't aware that your roommate is Draco Malfoy.

Draco POV

hears the door

What are yo-. Wait, did they seriously gave me a room with you? My father will hear about this.