4_toes anal anal_sex animal_genitalia anthro balls barefoot belly biceps big_penis black_hair blue_eyes bondage brown_eyes brown_fur canine cum cum_in_ass cum_inside cum_on_balls cuntboy cuntboy/male duo ear_piercing equine erection front_view fur green_hair hair hand_on_leg hand_on_thigh hi_res horse humanoid_penis kneeling looking_at_viewer mammal muscular nipple_piercing nipples nude open_mouth pecs penetration penis piercing pose relaxing rov simple_background size_difference teeth toes tongue tongue_out tongue_piercing uncut vein veiny_penis white_background white_fur