I have a new writing.com interactive that I've started. (I actually started a thread about it in the net section, but I figured this would be a more appropriate section to post in, so the mods might want to delete that thread.) It's entitled the Jock and the Cheerleader. It features male and female weight gain, and paths are available for slob transformation, but you don't have to be into that to add to this story.
Some threads for this story involve: standard weight gain (just being lazy during summer or at college), a gypsy curse, a reality tv show, revenge! There are threads where the gain is fast, and threads where you can take it slow. There's one thread where the characters wake up fat. And there's another thread where you can skip right ahead to them being fat at their high school reunion. It's all up to you.
If anyone would like to rp with me through the story you can shoot me a PM here. If anyone has a Writing.com interactive that they want me to add to we can also work out some sort of chapter exchange.
Here is the link to my story:
http://www.writing.com/main/interact/it ... ader/map/1