Exboyfriend Who I Hate Make — Nagi Hikaru My

I can write a complete story about "Nagi Hikaru, my ex-boyfriend who I hate." I'll assume you want a short fiction piece from your perspective with strong emotions and a resolved arc. Any preferences: tone (angry, dark, cathartic, humorous), length (short ~800–1,200 words, or longer), and setting (modern city, school, workplace)? If you want no preferences, I'll proceed with a roughly 1,000-word cathartic contemporary piece. Which do you prefer?