As someone who writes all kinds of things because they just come to me, I'd say: "Write It". My advice is backed by two ideas:
- Only you can write the story. Your style, your delivery, the twists and turns, they are unique and only you can write it.
- Fifty Shades of Grey got published. It's awful, the structure, pacing, research, all of it. If it can get published, then what people like and don't like can't be judged by any useful metric.
As an addition, your writing will improve as you write. Like everything, practice helps. Write the story. Then show it to people. Some people will like it, others won't. That's okay. Maybe take some feedback, edit, and share it again.
The idea can't exists until you make it.
I would also, as an aside, suggest you might want to reconsider your friendship. A friend who doesn't support a creative endeavour is perhaps not a good friend.
Write it. Keep writing. Share it with others so enjoy reading. Enjoy the process.
If you want to see the short stories I write, you can find examples here: https://ko-fi.com/blackxanthus