3:2 alien alien_humanoid ambiguous_gender fade_(natural_selection) humanoid kharaa_(natural_selection) monster monstrous_humanoid natural_selection_(game_series) pentabins sharp_teeth simple_background sketch solo spikes spikes_(anatomy) teeth unknown_worlds_entertainment white_background
3:2 alien alien_humanoid erection fade_(natural_selection) genitals humanoid kharaa_(natural_selection) male monster monstrous_humanoid natural_selection_(game_series) penis pentabins sharp_teeth simple_background sketch solo spikes spikes_(anatomy) tapering_penis teeth unknown_worlds_entertainment white_background
alien alien_humanoid armor breasts duo eyes_closed fade_(natural_selection) female frontiersmen_(natural_selection) hand_on_butt hand_on_hip headgear helmet human human_on_humanoid human_penetrating humanoid interspecies kharaa_(natural_selection) male male/female male_on_humanoid mammal marine_(natural_selection) methados military monochrome monster monstrous_humanoid natural_selection_(game_series) nipples penetration sex sharp_teeth soldier spikes spikes_(anatomy) teeth third-party_edit unknown_worlds_entertainment warrior
alien alien_humanoid ambiguous_gender anthro anthrofied balls beak belt blue_and_white bodily_fluids bottomwear clothed clothed_sex clothing digital_media_(artwork) dripping duo erection faceless_character faceless_male fellatio genital_fluids genitals glans human human_on_anthro humanoid humanoid_genitalia humanoid_penis interspecies kharaa_(natural_selection) lerk_(natural_selection) licking lonbluewolf looking_at_another looking_at_partner looking_up male male/ambiguous mammal monochrome monster monstrous_humanoid natural_selection_(game_series) open_bottomwear open_clothing open_pants oral pants penile penis penis_grab penis_lick precum precum_drip purple_and_white saliva sex simple_background sketch solo_focus spikes spikes_(anatomy) teeth tongue tongue_out unknown_worlds_entertainment unzipped vein veiny_penis white_background zipper
abdominal_bulge alien alien_humanoid bodily_fluids bulge claws comic cum duo english_text fade_(natural_selection) genital_fluids genitals heart_symbol hexadec humanoid kharaa_(natural_selection) male male_pred masturbation monster monstrous_humanoid natural_selection_(game_series) onomatopoeia penis sharp_teeth signature simple_background skulk_(natural_selection) sound_effects spikes spikes_(anatomy) teeth text unknown_worlds_entertainment vore
alien alien_humanoid armor being_watched breasts duo english_text eyes_closed fade_(natural_selection) female frontiersmen_(natural_selection) group hand_on_butt hand_on_hip headgear helmet human human_penetrating humanoid interspecies kharaa_(natural_selection) looking_at_another male male/female mammal marine_(natural_selection) methados military monochrome monster monstrous_humanoid natural_selection_(game_series) nipples penetration profanity sex sharp_teeth soldier spikes spikes_(anatomy) teeth text unknown_worlds_entertainment warrior
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