Before the raid on the casino and subsequent punishments, Dice and Stein were good drinking buddies. Stein was Dice's bartender and "guy who could get things" when they weren't so little and it appears that old habits die hard. Hopefully Elder Kettle or Chef Saltbaker doesn't catch them playing poker or they'll be two sorry tots!
I created my OC Little Stein for Arkham's Little Dice universe. It's a great crime and rejuve/regression punishment comic series. Check it out here: https://www.deviantart.com/arkham-insanity