FURVERT!

anal_fluids animal_genitalia animal_penis anthro anthro_on_feral anus backsack balls bestiality black_bars bodily_fluids brown_body brown_fur butt canid canine canine_genitalia canine_penis duo equid equine equine_genitalia equine_penis erection eyes_closed feral fox fur gaping gaping_anus genitals grey_body grey_fox grey_fur half-erect hi_res horse joonkorner knot letterbox male male/male male_anthro male_feral mammal pawpads penis penis_backwards penis_size_difference quadruped raised_tail rear_view shaded size_difference sleeping spread_anus spreading tail urocyon