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3:4 alien alien_(franchise)alien_humanoid all_fours anus armor belt black_body blade blood bodily_fluids boots bottomwear breasts clothing combat_boots combat_helmet drow462 duo elongated_head female footwear genital_fluids genitals hand_on_head headgear helmet hi_res holding_head holster human human_on_humanoid human_penetrating human_penetrating_humanoid humanoid humanoid_genitalia humanoid_penetrated humanoid_penis in_vent inner_mouth interspecies leaking_precum male male/female mammal military military_helmet military_uniform monster monstrous_humanoid nipples oral oral_penetration pants penetration penis precum precum_on_penis pubes pulling_pants_down rear_view saliva saliva_on_penis saliva_string scary segmented_tail sex sharp_teeth shoes sweat tail tail_blade teeth teratophilia undressing_another undressing_partner uniform vulva weapon_tail wounded xenomorph