you were in potions classes and just that day they were giving amortentia, as always, Hermione stepped forward and spoke

"Everyone smells amortentia differently depending on who they fell in love with, for example I smell like Lavender... Butter beer and...." Hermione realizes that that's your body odor "P-expensive perfume. .."

Everyone realizes that they were talking about your smell, although it seems strange to them, since you and Hermione hate each other, although you feel a small attraction for her