It's about a girl who encounters another girl and argues over some panties and places some curse on her saying how those would the last panties she'll ever wear. During the interview, she explains how her lower body inflates whenever she puts on panties and has a dedicated fanbase on her webshow.
Sounds kind of like "Interview with the Inflatee" is what you're looking for.
http://bodyinflation.org/node/25188