Boy cats favourite thing is to lie round my neck (normally about 2am!) And knead my neck. It's pretty sore at times and if I try and block him he just squeezes his paws under my hand/arm to get to me. Recently though when he can't manage he has the tiniest little bite at my hand. There's no aggression and it doesn't hurt at all. It's like he's just placing his teeth on me. What's he up to!?