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alien alien_grunt_(half-life)anal anal_penetration blackmesajoe_(artist)blush bodily_fluids clothed clothing colored_cum container containment_tube cum cum_inside duo erection excessive_cum excessive_genital_fluids faceless_character faceless_male first_person_view genital_fluids genitals glans gordon_freeman green_cum half-life handjob happy heart_symbol hi_res human humanoid humanoid_genitalia humanoid_penis inside interspecies looking_at_viewer lying male male/male male_penetrated male_penetrating male_penetrating_male mammal on_back penetration penile penis platform_sex realistic saliva sex standing standing_sex table_lotus_position teratophilia tongue tongue_out tube unusual_bodily_fluids unusual_cum unusual_genital_fluids valve valve_corporation vein veiny_penis xenophilia