Rule 34 Dev - 2018 animal_genitalia anthro anus black_mane black_nose border dave_canine equid equine erection eunuch fur genitals grey_background grey_body grey_fur half-erect hi_res horse humanoid_genitalia humanoid_penis male mammal mane nipples penis pink_nipples sheath simple_background sitting solo spread_legs spreading white_border|8394575848