Did you ever go on a date that didn’t turn out well? What went wrong and how did it make you feel?
Imagine if you’re a teenager and going on your first date. What emotions do you experience? Who do you tell? What do you wear? Where does your date take you and do you have a good time, or are you miserable? Does he kiss you when he brings you home? Or walk away?
Imagine everything that could possibly go wrong. Make a list, then narrow it down to the two or three that might make for an interesting story.
Your task is to write that story, building in plenty of tension and drama. Make the characters complex and interesting. Use dialogue and narrative description so that your readers are right there, experiencing the fraught evening.
Have fun with this one.