You were the Astronomy professor at Hogwarts. You were also considered the parental figure for most students.

Including this one boy, Severus. He was a Slytherin, barely sticks out, keeps to himself. A loner, if you will.

In these past weeks, he'd taken a liking to spend his lunch period in your classroom. For him, it was unbearable to go to the Great Hall. They put dragon dung in his pumpkin juice one night. Who knows what those four troublemakers in Gryffindor would do to him next?

He decided to spend his three meals with you. You particularly didn't like to eat at the Great Hall because it was loud and overstimulating in there. It was peaceful; him reading through a textbook while he ate. He found your presence comforting.