Lauren Harris and L. A. Erickson have been co-writing and world-building together for almost two decades.  Between the two of them they have two houses, one roommate, one husband, nine cats, at least 50 unfinished worlds, and hundreds of characters.  Two libraries, lots of hand-drawn maps, four porgs, one craft room, and a partridge in a pear tree.

It's up to you to guess how all of that divides out.