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anthro black_body black_fur bound bridle choker equid equine erection fangs fur genitals grey_background hair hi_res hooves horn jewelry long_hair long_tongue male mammal mythological_creature mythological_equine mythology necklace nude nyxie penis purple_penis purple_tongue sabertooth_(anatomy)simple_background smooshkin solo submissive submissive_male teeth tongue unguligrade unicorn valerian_(smooshkin)