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alien alien_genitalia anal anal_penetration aquatic bestiality blackmesajoe_(artist)bodily_fluids clothing colored_cum cum cum_inside cum_on_chest duo erection feral first_person_view fish genital_fluids genitals gordon_freeman green_cum half-life heart_symbol hi_res human human_on_feral humanoid_genitalia humanoid_penis ichthyosaur_(half-life)interspecies lying male male/male male_on_feral male_penetrated male_penetrating male_penetrating_male mammal outside penetration penis power_bottom reptile saliva scalie sex shark tapering_penis teeth teratophilia tongue unusual_bodily_fluids unusual_cum unusual_genital_fluids valve valve_corporation vein veiny_penis xenophilia