FURVERT!

anal anal_penetration animal_genitalia animal_penis bestiality bookman_v duo equid equine equine_genitalia equine_penis feral feral_penetrated from_behind_position genitals horn horse human human_on_feral human_penetrating human_penetrating_feral interspecies larger_penetrated male male/male male_on_feral male_penetrated male_penetrating male_penetrating_male mammal penetration penile penile_penetration penis quadruped sex size_difference