Up until recently, we had two cats. One of them was very comfy and would rub, softly knead, and just generally enjoy close contact. And he never ever bit. He was the comfiest happiest most affectionate little dude.
The other, whom we still have, expresses herself, shall we say,
orally.
Angry? Bite. Annoyed? Bite. Playful? Bite. Happy? Believe it or not, bite.
I can gauge her mood by putting the edge of my palm close to her face and seeing whether she would decide to rub on it or bite it, and how hard. Even when she's happy and content, she often expresses it through little love nibbles or nips. Never enough to actually injure you, though if she was angry enough it could certainly hurt a bit and leave a mark.
They were also pretty good buddies, up until the former passed away from illness. The biter and I miss him
