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alien alien_genitalia anus arthropod blackmesajoe_(artist)blue_anus blue_cum blue_penis bodily_fluids bridge catwalk colored_cum combine_gunship crowbar cum cybernetics cyborg detailed_background erection flying gaping gaping_anus genital_fluids genitals gun half-life half-life_2 heart_symbol hi_res living_machine machine male not_furry penis precum puffy_anus ranged_weapon scaffolding sea solo synthetic tools unusual_bodily_fluids unusual_cum unusual_genital_fluids valve valve_corporation vein water weapon white_body white_skin wings