Rule 34 Dev - 2017 anatomically_correct anatomically_correct_penis animal_genitalia animal_penis anthro anthro_on_anthro balls bench biceps biped black_and_white duo equine equine_penis erection feathering fur hair handjob hooves horse horsecock huge_flare locker locker_room male mammal monochrome muscular muscular_male mutual_masturbation nipples nude open_mouth pecs penis penis_grab rannik sex signature sitting snout trogan yaoi|2503901520