Well, Funbun draws almost exclusively F/F and F/f stuff, but generally there aren't two women restraining the spankee.
Paula Meadows also features feminine spankees in her drawings, but IIRC they're without coloring and they hardly look all that "cartoonish" either.
Mr. KD does fit this description, his spankees tend to be girls and they're usually crying, but again the restraining would be unusual for him.
I've seen Endart drawings similar to the one described, but not involving anyone underage.
Jay Em does seem to like to draw 'gang-up' artwork with two or more spankers outnumbering and forcibly restraining the spankee...

--C.K.