my kitty - turbo - loves to play. He will start "nibbling" on your finger but then really start chomping down like he really starts to like it. He has actually drawn blood on me! He does not seem agressive at all, just like his teeth are sharper than he thinks. I try to immediatly put him down when he does this but he just jumps right back up for more play...any ideas on what to do? I don't want him to grow up a biter.