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anal anal_penetration animal_genitalia aquatic archaeocete azhdarchid basilosaurid basilosaurus beach beak black_body cetacean day deepdarkfantasies duo erection feral feral_on_feral feral_penetrated feral_penetrating feral_penetrating_feral genital_slit genitals grey_body hi_res larger_penetrated long_penis male male/male male_penetrated male_penetrating male_penetrating_male mammal outside penetration penis pink_penis prehistoric_species pterosaur quetzalcoatlus reptile scalie sex size_difference sky water whale