Income Tool Time

My friend and I want to collaborate on a story, and we were searching, anyone that knows a good software, or in browser, collab tool, please tell me!

use google docs, free with 5gb of free storage (plenty for a massive novel), support for all kinds of standard word editing features
only bad thing is a little bit of lag when many people are working on the same document, but with two people it shouldn’t be noticeable

docs.google.com

all you need is a free google/gmail account

https://accounts.google.com/SignUpWidget?service=writely&continue=https%3A%2F%2Fdocs.google.com%2F&followup=https%3A%2F%2Fdocs.google.com%2F&ltmpl=homepage

for the account