ive read it a while ago and i dont really remember the name or too much of the plot… so!
it was about a black haired girl (low pigtails?) blackmailing/bullying a boy until he has enough. at the end is revealed that was her intention from the start and iii think the last page is her masturbating?
bad description but its all i can manage it. i also accept any recommendations that might be similar 🙂