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3d 3d_(artwork) against_surface alien armor ass balls belly big_balls big_belly big_breasts big_butt big_penis blood bodily_fluids body_control breasts claws clothed clothing combine_(half-life_series) corruption dark_body dark_skin darkflash23 detailed_background digital_media_(artwork) erect_penis erection faceless_character faceless_female faceless_male fangs female female_headcrab female_penetrated foursome gas_mask genitals grey_body group group_sex gun half-life half-life_(series) half-life_2 headcrab headcrab_zombie hi_res holding_object holding_weapon host human infected light-skinned_male male male/female male_penetrating male_penetrating_female mammal mask masked masked_male mind_break mind_control monster_girl_(genre) nipples nude nude_female on_glass parasite partially_clothed penetration penile penile_penetration penis ranged_weapon sex source_filmmaker standing submissive submissive_female takeover teeth thick_thighs undead valve weapon zombie zombie_girl

3d 3d_(artwork)against_surface alien armor ass balls belly big_balls big_belly big_breasts big_butt big_penis blood bodily_fluids body_control breasts claws clothed clothing combine_(half-life_series)corruption dark_body dark_skin darkflash23 detailed_background digital_media_(artwork)erect_penis erection faceless_character faceless_female faceless_male fangs female female_headcrab female_penetrated foursome gas_mask genitals grey_body group group_sex gun half-life half-life_(series)half-life_2 headcrab headcrab_zombie hi_res holding_object holding_weapon host human infected light-skinned_male male male/female male_penetrating male_penetrating_female mammal mask masked masked_male mind_break mind_control monster_girl_(genre)nipples nude nude_female on_glass parasite partially_clothed penetration penile penile_penetration penis ranged_weapon sex source_filmmaker standing submissive submissive_female takeover teeth thick_thighs undead valve weapon zombie zombie_girl

3d 3d_(artwork) against_surface alien armor ass balls belly big_balls big_belly big_breasts big_butt big_penis blood bodily_fluids body_control breasts claws clothed clothing combine_(half-life_series) corruption dark_body dark_skin darkflash23 detailed_background digital_media_(artwork) erect_penis erection faceless_character faceless_female faceless_male fangs female female_headcrab female_penetrated foursome gas_mask genitals grey_body group group_sex gun half-life half-life_(series) half-life_2 headcrab headcrab_zombie hi_res holding_object holding_weapon host human infected light-skinned_male male male/female male_penetrating male_penetrating_female mammal mask masked masked_male mind_break mind_control monster_girl_(genre) nipples nude nude_female on_glass parasite partially_clothed penetration penile penile_penetration penis ranged_weapon sex source_filmmaker standing submissive submissive_female takeover teeth thick_thighs undead valve weapon zombie zombie_girl

1girls 2d 3boys alley alyx_vance ambiguous_penetration ass blood breasts closed_eyes crying dark-skinned_female dark_skin erect_penis erection exposed_breasts face_fucking fellatio female female_penetrated forced forced_oral foursome gangbang gangrape gore group_sex half-life half-life_(series) half-life_2 headcrab headcrab_zombie human human_female human_penetrated kokobiel male male_penetrating male_penetrating_female male_penetrating_human monster monster_gangrape monster_rape multiple_boys nipples oral oral_sex pants_down penetration penis rape restrained ripped_clothes ripped_clothing ripped_shirt saliva_on_penis sex spitroast tears torn_clothes torn_clothing torn_shirt undead wet_pussy zombie zombie_boy zombine_(half_life-series)