2009 5_fingers anatomically_correct anatomically_correct_penis animal_genitalia animal_penis anthro balls biped black_bottomwear black_clothing black_hair black_underwear clothed clothing digital_media_(artwork) equine equine_penis equus erection eyes_closed front_view fur grey_fur gustav_(equus) hair horse hyper hyper_penis long_penis male mammal medial_ring penis price_tag short_hair signature simple_background snout solo standing sweat sweatdrop thick_penis thong thought_bubble topless underwear vein veiny_penis white_background