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2025 animal_genitalia animal_penis anthro balls equid equine equine_genitalia equine_penis erection fur fuzimir_(character)genitals greyscale hi_res hooves horse kneeling male male_anthro mammal mane markings medial_ring monochrome muscular muscular_anthro muscular_male nude nude_anthro nude_male pecs penis sheath simple_background solo spots spotted_body spotted_fur tail tanutanuki vein veiny_penis