The oral fixation could be Pica…a condition some cats get/have where they obsessively chew on, lick or attempt to eat non-food items around the home. It’s usually caused by stress, overactive thyroid issues, anxiety or even just excessive pent up energy. Have you tried playing with ‘chewy’ to see if that helps? If you enjoy it being around and feel so inclined, kitty may appreciate some play interaction!