I have started an Infinite Story on Infinite-Story.com that is inflation/transformation fetish based. It's a choose-your-path game that anyone can add to. You want to add body inflation, go ahead. Add furries... why not? Think that chick needs a raging penis, have at it! Add whatever fetish you enjoy and whatever characters and scenarios that you can think up to it. The more people join, the bigger the story gets. So if you'd like to contribute, click the link below. I haven't tested this yet, but I believe if you make an account on the page things work a lot better. I know that non-logged in members can only add one thing at a time.
http://www.infinite-story.com/story/room.php?id=104585