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artist_request big_breasts big_nipples cow_ears cow_girl cow_print cowbell erect_penis erection female female_focus female_only gigantic_breasts huge_breasts imminent_rape imminent_sex mettaton mettaton_au mettaton_ex napstablook nipples rule_63 tagme thick_thighs underlust underlust_mettaton undertale undertale_au white_background wide_hips
artist_request big_breasts big_nipples cow_ears cow_girl cow_print cowbell erect_penis erection female female_focus female_only gigantic_breasts huge_breasts imminent_rape imminent_sex mettaton mettaton_au mettaton_ex napstablook nipples rule_63 tagme thick_thighs underlust underlust_mettaton undertale undertale_au white_background wide_hips
1boy 1girls alternate_universe artist_request big_breasts black_censor_bar censor_bar censored_penis female_focus glasses grabbing grabbing_from_behind huge_breasts huge_cock inverted_nipples male/female mettaton mettaton_au mettaton_ex napstablook questionable_consent rule_63 straight tagme thick_thighs thigh_sex underlust underlust_mettaton undertale undertale_au white_background wide_hips
1boy 1girls alternate_universe artist_request big_breasts black_censor_bar censor_bar censored_penis female_focus glasses grabbing grabbing_from_behind huge_breasts huge_cock inverted_nipples male/female mettaton mettaton_au mettaton_ex napstablook questionable_consent rule_63 straight tagme thick_thighs thigh_sex underlust underlust_mettaton undertale undertale_au white_background wide_hips
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
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
alternate_universe ambiguous_gender anon artist_request blush clothed clothing duo girly humanoid long_hair machine male male_only mammal mettaton mettaton_(underfell) mettaton_au mettaton_neo monster multi_eye open_mouth penis robot robotic_penis sharp_teeth simple_background smile teeth tongue underfell underfell_mettaton undertale undertale_au undertale_fanfiction video_games yaoi
alternate_universe ambiguous_gender anon artist_request blush clothed clothing duo girly humanoid long_hair machine male male_only mammal mettaton mettaton_(underfell) mettaton_au mettaton_neo monster multi_eye open_mouth penis robot robotic_penis sharp_teeth simple_background smile teeth tongue underfell underfell_mettaton undertale undertale_au undertale_fanfiction video_games yaoi
2016 alternate_universe androgynous cuntboy cuntboy_only duo gay-albino-robot girly glowing glowing_eyes hair half-closed_eyes humanoid intersex intersex_on_male long_hair machine male male_only mettacest mettaton mettaton_au mettaton_ex monster multi_arm multi_eye multi_limb open_mouth penetration pussy robot selfcest sex smile square_crossover tongue tongue_out underfell underfell_mettaton undertale undertale_au undertale_fanfiction vaginal_penetration video_games yaoi
2016 alternate_universe androgynous cuntboy cuntboy_only duo gay-albino-robot girly glowing glowing_eyes hair half-closed_eyes humanoid intersex intersex_on_male long_hair machine male male_only mettacest mettaton mettaton_au mettaton_ex monster multi_arm multi_eye multi_limb open_mouth penetration pussy robot selfcest sex smile square_crossover tongue tongue_out underfell underfell_mettaton undertale undertale_au undertale_fanfiction vaginal_penetration video_games yaoi