So I'm about 20,000 words into the second novel. And it's weird, and I have Feelings.
This is the one book of the five that I never had what I considered a pre-draft for. In 2011, I wrote what was then the second in a two-book series (the novel I just finished rewriting was the first book).
But since then, the second book plot has changed completely. That 2011 book is more in-universe practice than a rough draft for what I'm doing now.
So this is a completely fresh story to me.
Long story short -- I've grown afraid of the experience of writing this book being over too quickly!
Even though I know the first draft is just the beginning of the journey, it's an irreplaceable experience.
It does capture the tone of the second story, though: trying and failing to keep hold of a brilliant whirlwind of processes you only remotely understand, and somehow existing on the edges of a situation and in the core simultaneously.