What's that? No, I'm a married man, but thanks for offering.
The good news is that the other book is also a Matador novel, working title of which is Churl. (That word -- like "matador," -- doesn't always mean what folks think it means. From Old English "ceorl," a churl was the lowest rank of freeman, between serf and thane. But of course, you knew that, right?)
I mentioned this in passing a while back, and I think the timing of it will be about twenty years or so after Black Steel, plus or minus a bit.
Got some plot things to work out first and I'll have to re-read the second trilogy -- Albino, Steel, Brother Death, to make sure I don't get crosswise with myself.
Usually I have a primary work-in-progress and a back-burner project going at the same time, though it's been a while since I had three or four cooking. I don't really have time to be fiddling with one more, but I've learned that when the idea pops up and stares you in the eye, if you don't deal with it when it is fresh, you might not get back to it.