Anyone who has been paying attention to the pages for the books may have noticed something odd. My name has been retroactively added as co-author to the earlier books. There's no attempt at deception going on. It's just that we were always a little unsure as to what kind of credit I should get for my part in the creative work.
On the first two books, I contributed book planning, world-building, character development, etc., and although Allan wanted to give me coauthor credit, I didn't feel what I had done merited that much. How does one even classify contributions like refining genre, suggesting that science fiction elements actually make paranormal stories seem more plausible and thus, scarier.
I didn't really recognize how much self-publication had grown up and become a viable option, nor how much Allan had grown as a writer, until he came out with the first finished novel. While making a commercial success was still a long shot, the fact was, he'd managed a book worth reading and he had control of the publication and marketing of it.
I still considered my contributions to be more "co-creator" than "co-author", but there's no option for that on book cover designs.
On the third book, I was suggesting some edits on a part he wasn't satisfied with, and which dealt with a character who I had created. After a few tries at telling him what to do, I asked if he'd mind me taking over the chair and writing the edit myself. He loved the result, and I ended up going through and revising multiple scenes to get them just right. This time, I couldn't refuse co-author credit, because I had indeed done a significant amount of the writing myself.
Then we started to reconsider the earlier books. I would have preferred being listed as "co-creator" rather than "co-author", but there were a number of scenes where I'd helped with dialogue, relationships, etc. I had spent a few years listening to Allan describe the development of ideas in a different way than I recalled them happening. And I came to realize that accepting a little too much credit was better than being forgotten.