confused I'm not quite sure what to say... I don't like the intro and the conclusion, it's much to narator for me. If you have specific information you need the reader to know, just put bits and peices of it throughout the story, don't just state it all at the begining. It was too easy to trick Satan. To make it interesting, you must come up with a better loophole. I liked how Satan was beautiful though, nice touch. Your writing style itself needs some work. I'm not quite sure what it was missing, but it just seemed a bit... lacking.
confused sorry if that doesn't help. If you have any specific questions just pm me.