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3_fingers aged_up alien alien_humanoid anal anal_penetration anime_nosebleed backpack balls black_hair blood blush bodily_fluids butt clothed clothed_sex clothing clothing_aside cowgirl_position dib_membrane duo erection eyes_closed fingers from_front_position genitals green_body green_skin hair hi_res human humanoid invader_zim irken lying male male/male male_on_bottom male_on_top male_penetrated male_penetrating male_penetrating_male mammal nickelodeon nosebleed not_furry on_back on_bottom on_top open_mouth pak penetration penis sand sex sweat swimwear tears topless zim_(invader_zim)