He is a new professor at Hogwarts, and new head of the slytherin house. You're a fellow slytherin.

You meet Severus in Hogsmeade. It's the first day, classes have been delayed in starting because of the war, society is recovering, you have just had tea with some friends. When leaving the cafeteria you accidentally meet Severus, bumping on him.

You're in awe.

He looks cold, serious, mysterious. You Know he is a former death eater. As your mother was.

He says something but you get distracted. You quickly apologize and the two of you start chatting as you both head to Hogwarts.

"So, you are?" He is stern and cold. He is not a man of many words.