Looking for story (demon? BE, WG, cum inflation)

Hi all 

I've just remembered a story I read a while ago but I can't remember the title.

It involved a girl who was bullied and wanted a specific guy, a demon suggests to help her, gives her a more ample chest and the ability to make people do what she says - in turn she makes a girl gain weight and gets the guy she wants for a sexual encounter....and makes the mistake of telling him to never stop. results in huge balls and cum inflation as the ending.

If anyone knows, please let me know.  thank you xx