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2008 anthro bdsm bell bell_collar biceps biped blue_and_white blue_theme bondage bottomless bound clothed clothing collar cowbell crop_top digital_media_(artwork)doxy equid equine erection faceless_character faceless_male femboy front_view genitals glans greyscale hair hands_behind_back horse humanoid_genitalia humanoid_penis long_hair male mammal monochrome muscular muscular_anthro muscular_femboy muscular_male nipples open_mouth penis seductive shirt simple_background solo standing studded_collar studs submissive submissive_male tail topwear torso_shot ventral_groove