Well, I've decided to restart this thread, as the original was cluttered, old and ignored. For anyone who doesn't know, The Unending BE Addventure is a type of round-robin post by post set of stories, called threads. Each post has multiple options to follow a story in, which can in turn be added onto by the original author or anyone who wants to add on. The addventure site itsself is a breeding ground for just about every type of transformation known to man, although it is extremely NSFW, and most of it is pornographic, so watch out.
In this case, we have one for the Metroid series, starting here.
http://www.bearchive.com/~addventure...64/564135.html
The most recent post is here.
http://www.bearchive.com/~addventure...04/804209.html
I highly encourage people to add on to this, and have fun. Here is the Recents page.
http://www.bearchive.com/~addventure.../docs/recents/