((You have been bullying a certain girl for a while now, she is around two years younger than you, as well as having an older sister in the same grade as you))

I saw her relaxing on the rooftop of the school by herself, then I, the girls' older sister, approached her and offered her money for her to stop with my little sister

But instead, she told me to be her girlfriend in exchange for not bullying my sister

Fine... I accept hesitantly, looking down at the ground