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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
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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2016 3boys black_hair blush erection gay-albino-robot glowing glowing_eyes group hair heart hi_res humanoid humanoid_penis machine male mettacest mettaton mettaton_ex mettaton_neo monster nipples nude open_mouth penis robot selfcest sex simple_background smile square_crossover teeth tongue tongue_out underfell underfell_mettaton undertale undertale_fanfiction video_games yaoi
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1girl 2boys androgynous android armor artist_name black_armor black_shorts blue_jacket english_text fins head_fins highres hood hood_down hooded_jacket jacket korokor59513559 mettaton mettaton_neo monster_girl multiple_boys open_clothes open_jacket sans_(undertale) shirt shorts skeleton smile teeth undertale undyne undyne_the_undying white_shirt
1girl 2boys androgynous android armor artist_name black_armor black_shorts blue_jacket english_text fins head_fins highres hood hood_down hooded_jacket jacket korokor59513559 mettaton mettaton_neo monster_girl multiple_boys open_clothes open_jacket sans_(undertale) shirt shorts skeleton smile teeth undertale undyne undyne_the_undying white_shirt
1boy absurdres android arm_cannon black_hair colored_skin cowboy_shot facial_mark glowing glowing_eye grey_skin grin highres looking_at_viewer male_focus mettaton mettaton_neo shoji_sakura short_hair shoulder_plates smile solo teeth undertale weapon white_background
1boy absurdres android arm_cannon black_hair colored_skin cowboy_shot facial_mark glowing glowing_eye grey_skin grin highres looking_at_viewer male_focus mettaton mettaton_neo shoji_sakura short_hair shoulder_plates smile solo teeth undertale weapon white_background
1boy absurdres android black_background black_hair colored_sclera colored_skin eyelashes eyepatch grey_skin heart highres looking_at_viewer male_focus mettaton mettaton_neo red_eyes solo spiked_hair undertale upper_body yellow_sclera yokaze_(xxxdisxxx)
1boy absurdres android black_background black_hair colored_sclera colored_skin eyelashes eyepatch grey_skin heart highres looking_at_viewer male_focus mettaton mettaton_neo red_eyes solo spiked_hair undertale upper_body yellow_sclera yokaze_(xxxdisxxx)
alphys annoying_dog aqua_background asgore_dreemurr asriel_dreemurr chara_(undertale) dog everyone eyepatch flowey_(undertale) frisk_(undertale) furry furry_male ghost glasses grillby headphones mettaton mettaton_ex mettaton_neo monster monster_boy monster_girl muffet napstablook open_mouth papyrus photoshop_flowey robot shirt simple_background smile standing teeth tenya_mizuki undertale undyne undyne_the_undying white_shirt
alphys annoying_dog aqua_background asgore_dreemurr asriel_dreemurr chara_(undertale) dog everyone eyepatch flowey_(undertale) frisk_(undertale) furry furry_male ghost glasses grillby headphones mettaton mettaton_ex mettaton_neo monster monster_boy monster_girl muffet napstablook open_mouth papyrus photoshop_flowey robot shirt simple_background smile standing teeth tenya_mizuki undertale undyne undyne_the_undying white_shirt
2boys android arrow_(symbol) boots character_name character_sheet cousins crying dual_persona english_text ghost gloves hair_over_one_eye hand_on_own_hip hat headphones heart high_heel_boots high_heels highres lips male_focus mettaton mettaton_ex mettaton_neo monochrome multiple_boys napstablook no_humans parted_lips polaris_(polarissketches) robot sepia spoilers standing tears top_hat undertale watermark web_address
2boys android arrow_(symbol) boots character_name character_sheet cousins crying dual_persona english_text ghost gloves hair_over_one_eye hand_on_own_hip hat headphones heart high_heel_boots high_heels highres lips male_focus mettaton mettaton_ex mettaton_neo monochrome multiple_boys napstablook no_humans parted_lips polaris_(polarissketches) robot sepia spoilers standing tears top_hat undertale watermark web_address
1boy :3 :d android bad_id bad_pixiv_id black_background brown_eyes chibi eyelashes fang gyate_gyate hair_over_one_eye half-closed_eyes looking_at_viewer lowered_eyelids lowres male_focus mettaton mettaton_neo open_mouth parted_lips portrait purple_hair robot smile solo spoilers undertale upper_body yaruky
1boy :3 :d android bad_id bad_pixiv_id black_background brown_eyes chibi eyelashes fang gyate_gyate hair_over_one_eye half-closed_eyes looking_at_viewer lowered_eyelids lowres male_focus mettaton mettaton_neo open_mouth parted_lips portrait purple_hair robot smile solo spoilers undertale upper_body yaruky
1boy android arm_cannon black_hair colored_skin cowboy_shot fayren glowing glowing_eye grey_skin grin hand_on_own_hip heart heart-shaped_pupils highres male_focus mettaton mettaton_neo pink_background purple_eyes smile solo spoilers symbol-shaped_pupils teeth undertale weapon
1boy android arm_cannon black_hair colored_skin cowboy_shot fayren glowing glowing_eye grey_skin grin hand_on_own_hip heart heart-shaped_pupils highres male_focus mettaton mettaton_neo pink_background purple_eyes smile solo spoilers symbol-shaped_pupils teeth undertale weapon
1boy android black_hair colored_skin glowing glowing_eye grey_skin grin male_focus mettaton mettaton_neo portrait purple_eyes redlhzz smile solo spoilers teeth undertale
1boy android black_hair colored_skin glowing glowing_eye grey_skin grin male_focus mettaton mettaton_neo portrait purple_eyes redlhzz smile solo spoilers teeth undertale
1boy androgynous android bad_id bad_twitter_id black_hair colored_skin glowing glowing_eye grey_skin heart mettaton mettaton_neo mist_e10 red_eyes solo undertale weapon
1boy androgynous android bad_id bad_twitter_id black_hair colored_skin glowing glowing_eye grey_skin heart mettaton mettaton_neo mist_e10 red_eyes solo undertale weapon
alphys android arm_cannon artist_name bad_id bad_tumblr_id bodysuit breath clenched_hand closed_eyes comic crack creature crying dripping dying english_text from_side g0966 greyscale grin head_out_of_frame highres joints lab_coat laughing melting mettaton mettaton_neo monochrome monster_girl motion_lines open_mouth ponytail robot_joints shading_eyes sharp_teeth smile smoke spoilers spot_color talking tears teeth text_focus trembling undertale undyne undyne_the_undying upper_body weapon
alphys android arm_cannon artist_name bad_id bad_tumblr_id bodysuit breath clenched_hand closed_eyes comic crack creature crying dripping dying english_text from_side g0966 greyscale grin head_out_of_frame highres joints lab_coat laughing melting mettaton mettaton_neo monochrome monster_girl motion_lines open_mouth ponytail robot_joints shading_eyes sharp_teeth smile smoke spoilers spot_color talking tears teeth text_focus trembling undertale undyne undyne_the_undying upper_body weapon
4girls 6+boys alphys alternate_form androgynous android animal_ears annoying_dog armor arthropod_girl asgore_dreemurr asriel_dreemurr blue_eyes blue_jacket blue_shirt blue_shorts boots bow breasts brown_footwear brown_hair brown_shorts cellphone chara_(undertale) cigar closed_eyes crazy_eyes crazy_smile cup doggo dress endogeny evil_smile extra_arms extra_eyes facing_away fangs flower flowey_(undertale) food freeze-ex frisk_(undertale) furry furry_female glasses glowing glowing_eye goat_ears green_shirt grin hand_up headphones heart horns iphone jacket lab_coat light light_particles looking_to_the_side mad_dummy_(undertale) mettaton mettaton_neo monster monster_kid_(undertale) mouth_hold muffet multiple_boys multiple_girls napstablook papyrus_(undertale) phone photoshop_flowey pie pink_shirt pink_skirt plate puffy_short_sleeves puffy_sleeves red_eyes red_hair reverse_grip sans_(undertale) scarf serious shirt short_hair short_sleeves shorts skirt smartphone smile spoilers striped_clothes striped_shirt tabard teacup teapot temmie thighhighs toriel undertale undyne undyne_the_undying white_dress wolf_ears
4girls 6+boys alphys alternate_form androgynous android animal_ears annoying_dog armor arthropod_girl asgore_dreemurr asriel_dreemurr blue_eyes blue_jacket blue_shirt blue_shorts boots bow breasts brown_footwear brown_hair brown_shorts cellphone chara_(undertale) cigar closed_eyes crazy_eyes crazy_smile cup doggo dress endogeny evil_smile extra_arms extra_eyes facing_away fangs flower flowey_(undertale) food freeze-ex frisk_(undertale) furry furry_female glasses glowing glowing_eye goat_ears green_shirt grin hand_up headphones heart horns iphone jacket lab_coat light light_particles looking_to_the_side mad_dummy_(undertale) mettaton mettaton_neo monster monster_kid_(undertale) mouth_hold muffet multiple_boys multiple_girls napstablook papyrus_(undertale) phone photoshop_flowey pie pink_shirt pink_skirt plate puffy_short_sleeves puffy_sleeves red_eyes red_hair reverse_grip sans_(undertale) scarf serious shirt short_hair short_sleeves shorts skirt smartphone smile spoilers striped_clothes striped_shirt tabard teacup teapot temmie thighhighs toriel undertale undyne undyne_the_undying white_dress wolf_ears
1boy alex_(bere) android arm_cannon bad_id bad_pixiv_id black_hair bleeding blood colored_skin dual_persona glowing glowing_eye grey_skin hair_over_one_eye heart mettaton mettaton_ex mettaton_neo red_eyes short_hair spoilers undertale weapon wings
1boy alex_(bere) android arm_cannon bad_id bad_pixiv_id black_hair bleeding blood colored_skin dual_persona glowing glowing_eye grey_skin hair_over_one_eye heart mettaton mettaton_ex mettaton_neo red_eyes short_hair spoilers undertale weapon wings
1boy alex_(bere) android arm_cannon bad_id bad_pixiv_id black_hair bleeding blood colored_skin dual_persona glowing glowing_eye grey_skin hair_over_one_eye heart mettaton mettaton_ex mettaton_neo purple_eyes short_hair spoilers undertale weapon wings
1boy alex_(bere) android arm_cannon bad_id bad_pixiv_id black_hair bleeding blood colored_skin dual_persona glowing glowing_eye grey_skin hair_over_one_eye heart mettaton mettaton_ex mettaton_neo purple_eyes short_hair spoilers undertale weapon wings
1boy android arm_cannon artist_name black_hair bodysuit colored_skin detached_legs grey_skin heart highres iwanashi_maiko mettaton mettaton_neo multicolored_hair outstretched_hand palms purple_hair shoulder_pads skin_tight spoilers standing undertale weapon
1boy android arm_cannon artist_name black_hair bodysuit colored_skin detached_legs grey_skin heart highres iwanashi_maiko mettaton mettaton_neo multicolored_hair outstretched_hand palms purple_hair shoulder_pads skin_tight spoilers standing undertale weapon
1boy 1girl android arm_cannon bad_id bad_pixiv_id black_sclera blue_skin colored_sclera colored_skin crosshair damaged dripping energy_spear energy_weapon fins glowing glowing_eye grey_skin head_fins heart heterochromia highres iwanashi_maiko looking_at_viewer melting mettaton mettaton_neo monster_girl polearm purple_hair red_hair sharp_teeth spear spoilers teeth undertale undyne undyne_the_undying upper_body weapon
1boy 1girl android arm_cannon bad_id bad_pixiv_id black_sclera blue_skin colored_sclera colored_skin crosshair damaged dripping energy_spear energy_weapon fins glowing glowing_eye grey_skin head_fins heart heterochromia highres iwanashi_maiko looking_at_viewer melting mettaton mettaton_neo monster_girl polearm purple_hair red_hair sharp_teeth spear spoilers teeth undertale undyne undyne_the_undying upper_body weapon
>:3 1boy :3 arm_cannon artist_name bad_id bad_twitter_id black_hair blue_dress clothed_robot commentary crossdressing dress flying ghost hato_moa heart mettaton mettaton_(ghost) mettaton_ex mettaton_neo multiple_persona red_eyes robot spoilers squiggle undertale v-shaped_eyebrows weapon wings
>:3 1boy :3 arm_cannon artist_name bad_id bad_twitter_id black_hair blue_dress clothed_robot commentary crossdressing dress flying ghost hato_moa heart mettaton mettaton_(ghost) mettaton_ex mettaton_neo multiple_persona red_eyes robot spoilers squiggle undertale v-shaped_eyebrows weapon wings
>:3 1boy :3 arm_cannon artist_name black_hair ghost hato_moa heart mettaton mettaton_(ghost) mettaton_ex mettaton_neo multiple_persona red_eyes robot sparkle spoilers spotlight undertale v-shaped_eyebrows weapon wings
>:3 1boy :3 arm_cannon artist_name black_hair ghost hato_moa heart mettaton mettaton_(ghost) mettaton_ex mettaton_neo multiple_persona red_eyes robot sparkle spoilers spotlight undertale v-shaped_eyebrows weapon wings
1boy adapted_costume android arm_cannon black_hair bodysuit boysquad colored_skin cowboy_shot glowing glowing_eye grey_background grey_skin hair_over_one_eye male_focus mettaton mettaton_neo purple_eyes realistic robot simple_background smoke solo spoilers standing undertale weapon wings
1boy adapted_costume android arm_cannon black_hair bodysuit boysquad colored_skin cowboy_shot glowing glowing_eye grey_background grey_skin hair_over_one_eye male_focus mettaton mettaton_neo purple_eyes realistic robot simple_background smoke solo spoilers standing undertale weapon wings
1girl ass bete_noire betty_noire blaster breasts brown_hair clothes_removed clothing female_focus flying frisky_69 glitchtale mettaton mettaton_neo nude red_hair solo_focus undertale_au
1girl ass bete_noire betty_noire blaster breasts brown_hair clothes_removed clothing female_focus flying frisky_69 glitchtale mettaton mettaton_neo nude red_hair solo_focus undertale_au
2010s 2016 2boys 2d 2d_(artwork) arms_around_legs ass_grab boots digital_media_(artwork) goodlegg grabbing_ass hair hair_over_one_eye hand_cannon high_heel_boots high_heels hotlegmeme humanoid humanoid_robot long_arms male mettacest mettaton mettaton_ex mettaton_neo monochrome robot robot_boy robot_humanoid selfcest shoes short_hair square_crossover undertale undertale_(series) video_game_character video_games
2010s 2016 2boys 2d 2d_(artwork) arms_around_legs ass_grab boots digital_media_(artwork) goodlegg grabbing_ass hair hair_over_one_eye hand_cannon high_heel_boots high_heels hotlegmeme humanoid humanoid_robot long_arms male mettacest mettaton mettaton_ex mettaton_neo monochrome robot robot_boy robot_humanoid selfcest shoes short_hair square_crossover undertale undertale_(series) video_game_character video_games
2010s 2016 2d 2d_(artwork) artist_name cum cum_while_penetrated digital_media_(artwork) gay_sex hair humanoid humanoid_robot male male_only male_penetrated male_penetrating male_penetrating_male mettacest mettaton mettaton_ex mettaton_neo missionary_position penetration penis pink_background robot robot_boy robot_humanoid robotic_penis selfcest sex shiroiyagi simple_background solid_color_background square_crossover undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2d 2d_(artwork) artist_name cum cum_while_penetrated digital_media_(artwork) gay_sex hair humanoid humanoid_robot male male_only male_penetrated male_penetrating male_penetrating_male mettacest mettaton mettaton_ex mettaton_neo missionary_position penetration penis pink_background robot robot_boy robot_humanoid robotic_penis selfcest sex shiroiyagi simple_background solid_color_background square_crossover undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) black_hair boots digital_media_(artwork) dripping duo femboy footwear gay hair hair_over_one_eye high_heel_boots humanoid humanoid_robot licking male male_only mettacest mettaton mettaton_ex mettaton_neo oral_sex peenie-kun pink_boots pink_high_heel_boots robot robot_boy robot_humanoid selfcest shoes short_hair simple_background soul soul_sex square_crossover undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) black_hair boots digital_media_(artwork) dripping duo femboy footwear gay hair hair_over_one_eye high_heel_boots humanoid humanoid_robot licking male male_only mettacest mettaton mettaton_ex mettaton_neo oral_sex peenie-kun pink_boots pink_high_heel_boots robot robot_boy robot_humanoid selfcest shoes short_hair simple_background soul soul_sex square_crossover undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2d 2d_(artwork) boots digital_media_(artwork) gloves grey_background hair hand_cannon humanoid humanoid_robot mettacest mettaton mettaton_ex mettaton_neo pink_boots robot robot_boy robot_humanoid selfcest simple_background sitting sitting_on_another square_crossover undertale undertale_(series) video_game_character video_games wire
2010s 2016 2d 2d_(artwork) boots digital_media_(artwork) gloves grey_background hair hand_cannon humanoid humanoid_robot mettacest mettaton mettaton_ex mettaton_neo pink_boots robot robot_boy robot_humanoid selfcest simple_background sitting sitting_on_another square_crossover undertale undertale_(series) video_game_character video_games wire
2010s 2016 2d 2d_(artwork) black_hair digital_media_(artwork) glowing hair hand_cannon humanoid humanoid_robot kissing making_out male male_only mettacest mettaton mettaton_ex mettaton_neo nipepocip robot robot_boy robot_humanoid selfcest square_crossover undertale undertale_(series) video_game_character video_games
2010s 2016 2d 2d_(artwork) black_hair digital_media_(artwork) glowing hair hand_cannon humanoid humanoid_robot kissing making_out male male_only mettacest mettaton mettaton_ex mettaton_neo nipepocip robot robot_boy robot_humanoid selfcest square_crossover undertale undertale_(series) video_game_character video_games