While I'm petting my cat, she'll start biting me. She grabs a little chunk of my arm (not hard at all, doesn't hurt), then moves her head from side to side, as if she was trying to rip part of my flesh off (even though its a very soft bite).
I've heard this is an affectionate reponse, but I've also read that it could be a sign that the cat no longer wants to be pet. The biting happens real early, so I really don't think she wants me to stop petting her.
Are there any other reasons this may be happening? I've gotten "love bites" from cats before, they usually bite my fingers, but I've never had a cat be so aggressively loving like this.
I have two cats that do this. They are from the same litter, and they're about 9 months old
EDIT: Both cats are fixed, and the biting has been occuring for a few months now