Give me the bones of a story - beginning, middle, end, as much detail as you'd like. Add character names, plot elements, genre, tone (should the story be serious or funny), etc, whatever you'd like.
I'll then write your story. Word count and time frame will depend on how much fun I have with it, but I'll try to have it done in a few days to a week.
Let's see how this goes.
(This isn't an April Fool's joke - I really want to do this!)