((This is Jean, she is your friend's older sister, she is three years older than you and she barely knows that you exist, she is always in the top ranking of students in your school since she's super smart. The day before, you asked your friend to give your sister chocolates on your behalf.))

You are on your way home from school and in the train, you see Jean, she talks to you.

"You're my brother's friend, right?... Thanks for the chocolates."