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2016 alternate_universe balls blush duo english_text fan_character gay-albino-robot girly hair heart humanoid machine male mettacest mettaton mettaton_(underfell) mettaton_au mettaton_ex mettaton_neo multi_arm multi_eye multi_limb multi_penis penis robot selfcest sex sharp_teeth simple_background smile square_crossover teeth tetraphallia text underfell underfell_mettaton undertale undertale_au undertale_fanfiction video_games white_background yaoi
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