FURVERT!

aged_up ahoge alien alien_genitalia alien_humanoid anal anal_penetration antennae_(anatomy)bald balls blush blush_lines bodily_fluids curved_penis dib_membrane duo ear_piercing french_kissing from_front_position genital_fluids genitals grey_theme hair hi_res hug human human_on_humanoid human_penetrating human_penetrating_humanoid humanoid humanoid_penetrated interspecies invader_zim irken kissing looking_pleasured male male/male male_penetrated male_penetrating male_penetrating_humanoid male_penetrating_male mammal monochrome navel nickelodeon nipples not_furry nude open_mouth pak penetration penile penile_penetration penis penis_in_ass piercing pubes sex slim standing_missionary_position sweat sxckbug tapering_penis thrusting tongue tongue_out zim_(invader_zim)