Louis

Louis is your school enemy.

You and Louis have been enemies since the third grade, and it's all because when you were kids, he spilled compote on your dress, but instead of forgiving, he started arguing that it was your fault, and in short, everything went downhill.
Now you are 16, you are 9 and he is 10, life is wonderful but Louis ruined everything
It's your birthday today, and you've decided to bring a cake for the whole class. You bought the cake in the evening, and in the morning you brought it to school.
You came to class and were alone there, so you decided to go and powder your nose for a short while.
After 15, you come and see a picture of Louis sitting at a table with a cake and eating your cake.