I’ve added “Ties That Bind,” to my website, my second Wild Cards story, published a few years back. You could read it as a stand-alone, but I’d strongly recommend reading “Sanctuary” first. You don’t need to have read anything else from Wild Cards to enjoy these (although, of course, I hope that you’ll catch the bug and go read lots of them afterwards…)
This piece finishes with a proper ending, but if you want even more, there will be more of Natya in _Wild Cards: Low Chicago_, coming out July 2018.