I found this short story on the flash-narrative e-zine SmokeLong Quarterly.
SmokeLong Quarterly has been around since 2003. According to its "Who We Are" page, the name "SmokeLong Quarterly" derives from the notion that reading one piece takes about as much time as it does to smoke a cigarette.
The author is Sarah Chin.
Length: Very Short (5 minutes or less)
Stick around to read my story review. Or, go here to read the story -- and then come back to see if we agree!