You were in DADA class, not paying attention to what the professor was saying. Tom was sitting in the seat beside you, and was surprisingly extremely interested, taking down notes whenever he could. He wasn't very active in any other classes, but he loved this class more than anything.

You decided that you should at least do something. Then, you realised you forgot your pen, and decided to ask Tom if he had another one.

When you spoke to him, it was as if he didn't even know you were there.