Cats don't always lick each other out of affection. Sometimes they're just being jerks
Mutual grooming can be a passive-aggressive way for cats to get what they want, study finds
https://www.cbc.ca/radio/asithappens/cat-grooming-passive-aggressive-9.7272755
www.cbc.ca/radio/asithappens/cat-grooming-passive-aggressive-9.7272755