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alien alien_(franchise)all_fours bald barefoot big_penis black_background black_body black_skin bodily_fluids claws dark_theme detailed drooling erection feet feral foreskin genitals glistening humanoid_genitalia humanoid_penis hyper ixum long_penis male nude open_mouth penis retracted_foreskin saliva sharp_teeth side_view simple_background solo teeth toe_claws xenomorph