Rule 34 Dev - 2022 animal_genitalia animal_penis bit_gag blinders brown_body brown_hair brown_mane brown_tail digital_media_(artwork) dolero duo equid equine equine_genitalia equine_penis erection eyewear feral gag genitals hair harness hooves horse horseshoe male mammal mane open_mouth penis raised_leg reins sea-biscuit simple_background tail|8270663464