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3_fingers alien alien_humanoid arms_above_head bdsm blush blush_lines bondage bound bovid_horn caprine_horn cuff_(restraint)fan_character featureless_chest female fingers fur hair handcuffed handcuffs horn humanoid invader_zim legs_tied long_tail metal_cuffs nickelodeon pubes raised_tail ram_horn restraints sharp_teeth solo tail tail_bondage tail_tied tail_tuft teeth thick_thighs tuft unknown_artist vortian