Sonya,
In another thread I mentioned that I co-authored a romance and we're working on the sequel. Along with that I have another romance I'm writing on my own.
It's a task to write two different romances at one time, especially when one is co-authored. There are times when I have to sit back a take time to sort things out; the last thing I or my co-author need is for me to put my character from my book into a scene in our book.
I write horror as well, so that could end up a bigger problem.
Good luck with your writing.
Joanne