Hi I'm also interested in writing and developing the lore , character interactions situations build up pay off and keeping track of continuity basically keeping track of what's happened so far and making sure later story developments stay consistent with it. I also like working through how situations build up and pay off and how characters would realistically react to what's happened previously.
I'd be interested in hearing how much of the story and lore you've already developed and what parts you're looking for another writer to help with.