I love the facial expression here....he's trying so very hard to be professional, look beatifically serene and exude the fluffy pleasure of having kittens crawl all over him...
And yet you can see - if you look very closely at his eyelids and the slightly tense corners of his mouth - what he's really thinking is "OW OW OW KITTY CLAWS IN MY SCALP! ~ OW ~ MUST.LOOK.LIKE ~ OW ~ I DIDN'T JUST GET SEVERAL TINY (YET SURPRISINGLY PAINFUL) PUNCTURE WOUNDS ON MY HEAD ! "
Still, since he really likes cats, I'm sure he had fun :)