My cat Chico,is the most loving,sweet cat,he gives "love-bites"or scratches when we stop petting him.
He does not clamp down hard,but does go through the skin.
The strange thing is,he too only does it to me,not hubby.
I don't see any aggression though and I have seen real aggression in a cat,where I needed hospital-care.
and thank you for rescuing a big black 4yr-old kitty
for some reason most people shun black cats.
I have a black kitty that nobody wanted too,that's my Chico.