And in between those sessions of play, I'm stressing about my next project.
For various reasons, I want it to be a trilogy. It just fits. There's a natural flow of the plot that can be broken up into 3 large arcs.
I'm stressing over it though because I'm kind of in-between a pantster and a planner in terms of writing. If I was a pantster, I would design the world and the characters, have a loose idea of the plot, and let them run wild (like Stephen King). But my best work tends to happen when I have a clear structure in mind.
I do have a fair idea of how the trilogy will go, but I worry about what happens after I've written (and hopefully gotten a deal for) the first book and I have to do the next parts without being able to go back and fix anything from the first book. This is the biggest difference of course, between writing a series and writing a single novel (even a very large one)--you can't really fix anything that you've written into an earlier book even if you later realize that you messed up something with plot implications for the next books.