Black Kitty and Trudy play a lot together. By play, I mean bite each other in the face. It gets rough and there's growling and hissing sometimes. I've tried to get pictures more than once but the action is so frantic that this is as close as I've gotten. This was right beside my feet while I'm working.
This is just a lull in the fight. Trudy is hanging back for a second and is about to pounce on Black Kitty's face. You can see the anticipation in Black Kitty's eyes.