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1:1 alien alien_(franchise)ambiguous_gender ambiguous_on_human balls bestiality black_hair bodily_fluids bottomless bottomwear brown_eyes chestburster clothed clothing duo erection eyeless eyewear fellatio feral feral_penetrated fleatrollus genital_fluids genitals glasses hair hand_on_body human human_on_feral human_penetrating human_penetrating_feral interspecies looking_at_genitalia looking_at_penis looking_down male male/ambiguous male_on_feral mammal nightmare_fuel oral oral_penetration pants parasite penetration penile penile_penetration penis precum saliva sex shirt size_difference smaller_penetrated smile teeth topwear trippy_(artist)what_has_science_done xenomorph xenophilia