I love the hyper-descriptive style. Everything was extremely well-illustrated. Love the shape progression from hourglass to belly -- that kind of "staging" is something I'd love to see in more stories. And the fact that it was all in UK English made it sexier. :P
I would love to see her story continue as she searched for the right guy with which to share her secret. That's sort of suggested in the story, and it did make me think, "oh, what would that be like?"
I would love to see this illustrated some day, because I think you have given an artist the perfect descriptions to see the scene.
Boy am I glad you stopped lurking and decided to share! :)
That was great! You have an excellent command of language, and your description of the expansion and the inflatee's reaction to it was superb.
The simple plot (girl knows she can inflate, practices inflation) is good enough for a first effort, but I hope you try to work some suspense into your future efforts. I remember another story about a girl who had a similar power, but she also needed to concentrate to stop her expansion, which got her into trouble when she was too distracted by other business. If you plan on writing more stories with that character, you might want to think of a way for her power to backfire or otherwise get out of hand. This is all up to you, of course, but my favorite inflation stories are the ones where something goes wrong.