Have you tried Puppetland? It mimics the narrative style of a children’s story by limiting the GM to speaking in the voice of the story’s narrator, and the players to talking in the voice of their puppet, with no description or narration.

E.g.
Sally’s Player: “Quickly! We’d better run out through the black door!”
GM: “Sally ran for the black door but just as she reached it it burst open from the other side…”

I didn’t realise how hidebound I was to a particular style of description until I tried to maintain the Puppetland rules for an hour.arcdream.com – Puppetland