Nice plot, but your story seems rather rushed.  It would have been nice to read about this all playing out over a longer time period.  Perhaps including, in detail, the times he spent in her pussy and ass; or his giving more intricate descriptions of other individuals' struggles.

There are quite a few spelling mistakes {e.g. "Her face, round a freckled." rather than "Her face, round 'and' freckled."} though nothing that takes away from the story.

Overall very nice, just to simplified.  I did thoroughly enjoy your story.  Kindly take note of that, as I commend you for having both written it and posting it.  Thank you for it.