Just to be clear...
Z&I books 1 & 2 are in the story Zeus and Io. 2 books, 1 story. This is book 3.
Book 3 is going to have an irregular posting schedule for a while. I was planning to do some other stories, but this one kept jumping to the front of my head. It's all outlined (in my head) but not written. I'm going to try to write 2 and post 1 for a while. I've got to get ahead and see where Io wants to go.
She's going to be the main driving force in Book 3, by the way.
Anyway, when she lets me know how it's going to develop, I don't want to backtrack too much to lay the clues, so... Write 2 post 1. That means maybe a week and a half - ish - before the next chapter.