ahe_gao animal_genitalia animal_penis anonymous_artist anthro athletic blush closed_eyes clothed clothing cum cum_on_penis cum_on_self duo equine equine_penis fan_character fur greyscale grin hair hi_res horse horsecock looking_pleasured lying male mammal monochrome muscular my_little_pony nude open_mouth pegasus penetration penis pony sex simple_background suit teeth wings yaoi