Dear hewbyrd,
While someone may indeed take you up on your offer to write a story for you, it seems what you seek is a commission from a professional writer. You would likely obtain greater satisfaction with the results. Understand, though, that such work is not free, nor is it quick - at least depending on the treatment you desire.
Why not post what you are willing to offer for such work, and the best way to reach you?
Best regards,
Felix Gato