What I would suggest would be to put it into a word document, and make it look like a published book.
Then save the product on one file in word, and then go to ebay and post your story on their, like maybe .50 cents or 1.00 to buy a digital copy and then email the buyer a copy of the story.
If you go with that plan I would suggest a few examples of your writing to be included in the description. Many Sci-Fi fans out there willing to spend a buck on a good story. Its also a good way to get your name out there.
I did this exact same thing for a story I did for fun awhile back, made a few hundred bucks off of it over a few months. Lots of positive emails.
Food for thought.
OH AND BTW, I would pay for this story...its starting off good

Keep it up