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abs alien alien_controller alien_genitalia alien_grunt_(half-life)alien_humanoid anal anal_penetration animal_genitalia anus armor being_watched berububs big_penis bodily_fluids bottomwear bottomwear_aside bracelet clothed clothing clothing_aside collar cum cum_in_ass cum_inside dominant dominant_male dripping duo erection forced from_behind_position genital_fluids genital_slit genitals half-life humanoid interspecies jewelry loincloth loincloth_aside loincloth_only looking_at_another looking_back looking_pleasured male male/male male_penetrated male_penetrating male_penetrating_male masturbation mostly_nude multi_eye multi_limb muscular muscular_dom muscular_male muscular_top nude open_mouth open_smile pain partially_clothed penetration penile penile_masturbation penis penis_size_difference precum precum_drip precum_string prodding puffy_anus questionable_consent rape red_bottomwear red_clothing red_eyes red_loincloth saliva screaming sex shallow_penetration sky slave smile smoke space submissive submissive_male teeth topless topless_male valve valve_corporation vortigaunt vortigaunt_slave voyeur xen_(half-life)