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16:9 2_toes 3d_(artwork)4_fingers abs alien alien_humanoid amber_eyes ambiguous_gender athletic athletic_humanoid athletic_male bed bedroom bestiality biped bungie chair claws crotch_crab crotchhugger deep_throat digital_media_(artwork)duo fast_headcrab feet fellatio feral finger_claws fingers furniture glistening glistening_body glistening_skin grey_body grey_skin group half-life half-life_alyx halo_(series)headcrab hi_res humanoid humanoid_on_feral humping inside interspecies looking_pleasured lying male male/ambiguous margevonn melee_weapon microsoft mouth_creature muscular muscular_humanoid muscular_male nipples not_furry nude on_back on_bed oral oral_penetration pecs penetration penile penile_penetration penis_in_mouth penis_nursing poison_headcrab quadruped sangheili science_fiction sex size_difference source_filmmaker_(artwork)table tan_body tan_skin teeth toe_claws toes tools unusual_anatomy valve valve_corporation weapon widescreen xbox_game_studios xenophilia