This, excuse my language, is bull. I made a game like this oh so how many years ago and was blocked for spam, called Tomb Raider Roleplay, which was continuing a story while everyone had a specific part(User 1: Lara User 2: Natla etc.). Ask Your_Envy, Quasimodo, oh hell here it is:
http://www.tombraiderforums.com/showthread.php?t=143784
It was the best. Not to spoil your fun or anything. And then it got locked after pages of fun. But anyway, I'll play.