I am looking for a fic where Spike wins Xander in a card game when Xander was a child because he was all his father had left to bet. Spike raises him (with help from a minion, servant?) and won't turn him until he's older. It seems they go back to Sunnydale at some point but no other characters stick in my head.
I checked Spanderfiles in AU, or AI as they call it, and Kid!fic with no luck.