As Kat told everyone her story of the most recent adventures to everyone, Kat noticed something. Every time she glossed over some details either to respect Minor and Major's privacy or just to make things seem slightly less dangerous, Sylvie would tap twice on the tail that Kat had wrapped around her.
At first Kat didn't pick up on what Sylvie was doing, and her track record wasn't perfect, but it was much better than chance. Once Kat started to check when she was being tapped it became extremely clear what it was being used for.
Halfway through the story Callisto brought out the first of the food. It was an elaborate spread of various fruits all cut up in intricate ways. A watermelon had been carved into a carving of Kat herself,