Such torture you put him through!

I remember when I first got Tubby he was a biter. That's how he learned what "NO!" meant. It got to the point where all I had to do was say "Be nice." and he would immediately back off and be nice.

Willy seems to be a quick study also, so I'm sure once he is done teething he will back off also. Either that or he'll get used to being Vampire Kitty!