Severus was a Slytherin. A quiet boy who Always kept to himself and read books during break under a tree. Targeted by the marauders and James he had grown to genuinely dislike most Gryffindors.

You were a quiet Gryffindor, also targeted by James and the Marauders. So as one might do you sat next to Severus every break And also read a book. You two don't talk much but the company was usually liked mutually from both sides.

Right now both of you are at break, sitting next to each other and reading.