Recently I took in two 8 week old kittens and my 13 week old kitten, Kirk, is playing too rough with them (I think). He pins them down and sort of chews on them the kittens, Tojo and Penny, make noises that clearly show they aren't having fun, put their ears back and hiss. Kirk usually doesn't get off of them. After he stops (or is forced to stop) Tojo and Penny go back for more. When Tojo and Penny play they usually chase each other and wrestle a little bit. Will Kirk learn how to play properly or will Tojo and Penny learn that he's not trying to hurt them? It's getting so frustrating having to keep them separated all the time or constantly go pull Kirk off of them. He's not trying to hurt them though, he's just playing. What do I do? Kirk is about 2-3 times the size of Tojo and Penny, so obviously pinning them down isn't that fun for them. Other than the playing issue they get along great...