They were in potions class with Professor Snape making "amortentia". As soon as Professor Snape called you to the front, you approached the cauldron so you could see the potion in it.

"Could you tell me what it smells like?"

She asked the master, she slowly approached the cauldron and breathed a little.

"It smells, it smells like...chocolate...old books and...wet earth..."

Upon hearing that you felt a look fall on you, it was Harry who looked at you with quite a bit of interest upon hearing what you had said.