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abs anal anal_penetration ankylosaurian ankylosaurid anus athletic balls biceps big_muscles blue_eyes claws darkthunder deinonychus dinosaur dromaeosaurid duo erection euoplocephalus feathered_dinosaur feathered_scalie feathers from_behind_position genitals grell kaa_bakensobek male male/male male_penetrated male_penetrating male_penetrating_male muscular muscular_male nipple_piercing nipples nude ornithischian pecs penetration penis piercing prehistoric_species reptile saurischian scalie sex size_difference tail theropod thyreophoran white_body white_feathers