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2023 animal_genitalia anthro autumn balls black_hair brown_body brown_fur casual_nudity detailed_background equid equine equine_genitalia forest forest_background fully_sheathed fur ganachethehorse genitals grass hair hi_res horse looking_at_viewer male mammal muscular muscular_anthro muscular_male nature nature_background outside plant river sheath sitting solo tree venlightchaser water