anal anal_penetration anthro anthro_penetrating anthro_penetrating_human big_dom_small_sub dominant dominant_male duo from_behind_position genitals human_on_anthro human_penetrated interspecies looking_pleasured male male/male male_penetrated male_penetrating male_penetrating_male muscular muscular_anthro muscular_male nature outside penetration penile penile_penetration penis penis_in_ass prone sex size_difference submissive submissive_male picometer canid canine canis human hybrid mammal were werecanid werecanine werewolf wolf