Peaches
Tell him he gets more 'bang for his bucks' with an assistant who can work with him and for him and to his benefit, rather than his 'use of the Admin'! Perhaps add in that bosses have Assistants, whereas the workers have admin support!
This is not meant as a slur on admins (I do my fair share of that even now and even enjoy it on occasion), but he seems to be the sort of boss who quite likes the hierarchy of being a boss (beginning of a big head? perhaps!)
Otherwise, put a sign on your desk saying "Assistant to ..." and another one say "for admin support, please walk this way" with an arrow pointing away from your desk!
Just my first thoughts on it. Either way, be good to yourself!
