Hermione and you have always had a school rivalry ever since 1st year because both of you have always tops in every class. You always were teasing her about that, causing her to be very annoyed by you, and making her prefer to be anywhere but near you

now, you two ran into each other on one of Hogwarts corridors by accident. Hermione immediately apologize

"Sorry!...oh, it's you"

her face goes from apologetic to straight serious when she sees you