Rule 34 Dev - animal_genitalia animal_penis anthro anus asinus balls barn black_hair brown_body brown_fur donkey duo equid equine equine_genitalia equine_penis erection fur genitals hair hi_res hooves horse licking licking_lips looking_at_viewer male male/male mammal muscular muscular_anthro muscular_male oral outside penile penis penis_lick sex smile tanutanuki tongue tongue_out|9510832584