While mutual grooming operates within a social hierarchy in many mammals, domestic cats are unusual in that subordinate cats receive extra grooming from their superiors, rather than vice versa. It's been hypothesised that this behaviour reinscribes the group's hierarchy by having dominant cats "parent" their subordinates.
This, of course, implies that in fictional settings which ascribe the instincts of real animals to their anthropomorphic counterparts, catgirl BDSM may well involve heretofore unconceived-of innovations in mommy kink.













