Writing What You Dont Want To Write

So in one of my classes, I need to write an ethnic fiction story. And even though I found a fun story to write  before(it's a few posts down, the one about the Vision Quest), I no longer can now. It's not what my brain wants to write. Because it has to be ethnic fiction, it's imposing limits on my ideas and forcibly transforming the story. That's no fun, and that's no way to write good writing.

So, even though writer's block doesn't exist, I am stuck. Guess I better just start writing and see what happens.