Pony Girl’s Cruel Bit Gag
I think this is John Willie artwork, probably from his Bizarre magazine. But it’s possible I’m being fooled by a clever modern homage. In my imagination, her open-mouthed posture around the bit in her ponygirl headgear is the result of an unpleasant spiked metal burr in the middle of the bit, not visible:
Elsewhere on Bondage Blog: