This was very good. I really liked the descriptions of the change and the reasoning behind it.
I'm not sure if you meant to mark it as complete or not, but I'd have to agree with Zapper. It doesn't feel finished, although it's a good start.
I'd call this a good start not a complete story. There were a couple of typos but nothing that prevented me from enjoying what you've written.
I'm not sure why the first couple of paragraphs is repeated with minor differences, at first I thought it was a time travel thing, but it wasn't.