Sunny will usually just lick me and try to pull my hand in closer, but Kiko does a bit of gentle biting then the licks start once he realizes it's belly scratches and not some form of aggression. I like to think they've got the self/others thing down pretty good now since they know the difference between me and the things they play with aggressively. They're really very gentle when it comes to randomly encountering my hands/feet/etc..
They're such good boys.
Frank the Tank: He's a big boy
Kiko Pico de Gallo: Spicy kitty