However, although a peace has settled among the pets, Siam is still aggressive toward his people. It is possible that Siam's aggressive nature toward his people could still be a result of jealousy over the other pets, but some behaviorists believe that some cats simply don't enjoy being touched or coddled. This behavior isn't well understood, even by experienced animal behaviorists. For whatever reason, petting which the cat was previously enjoying, apparently becomes unpleasant. Biting is the cat's signal that it has had enough petting.
Cats vary in how much they'll tolerate being petted or held.
If your cat is anything like Siam, you should become more aware of its body postures, and cease petting or stop any other kind of interaction before a bite occurs. DDFL suggests that if you want to try to prolong the amount of time your cat will tolerate petting, use some food rewards. At the same time, decrease the intensity of your petting. Continue to lightly pet your cat for a short time period while offering it tidbits. In this way, your cat will come to associate petting with pleasant things and it may help it to enjoy petting for longer time periods.