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alien alien_humanoid anal anthro black_hair blush bodily_fluids duo erection eyes_closed from_behind_position gamzee_makara genital_fluids genitals grey_body grey_skin hair heart_symbol homestuck horn horned_humanoid humanoid humanoid_genitalia humanoid_penis karkat_vantas male male/male male_penetrated male_penetrating male_penetrating_male ms_paint_adventures penetration penis precum sex troll_(homestuck)unknown_artist