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adrian_shephard alien ambiguous_gender bestiality black_mesa blackmesajoe_(artist)bodily_fluids camo clothing crotch_crab duo electrical_outlet erection eyeless fellatio feral first_person_view gas_tank genitals gloves half-life handwear heart_symbol hi_res human industrial_architecture inside interspecies male male/ambiguous male_on_feral male_pov mammal military monster oral penile penis race_x saliva sex soldier solo_focus spore_launcher teeth teratophilia thorns valve valve_corporation vein veiny_penis warrior xenophilia