FURVERT!

anal backsack balls bestiality border bridle butt clothing cock_transformation comic duo equid equine erection eyes_closed feral forced forced_transformation genitals horse human human_on_feral interspecies male male/male male_on_feral male_penetrated male_penetrating male_penetrating_male mammal merging monochrome multiple_scenes nude open_mouth penetration penis rape sex short_story stable story story_in_description transformation white_border zorro_re