FURVERT!

anal anal_penetration anatomically_correct anatomically_correct_anus animal_genitalia animal_penis anus backsack balls big_balls big_penis bodily_fluids brown_body brown_fur butt close-up comic duo equid equine equine_anus equine_genitalia equine_penis erection fasttrack37d feral feral_on_feral flared_penis fur genital_fluids genitals hi_res horse male male/male male_penetrated male_penetrating male_penetrating_male mammal multiple_scenes nude penetration penis perineum precum puffy_anus saliva sex vein