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2016 3d_(artwork) 3d_animation anal anal_penetration animated balls butt clothed clothing digital_media_(artwork) duo genitals gradient_background grey_background hair human humanoid interspecies leeterr legwear low_res machine male male/male mammal mettaton not_furry nude open_mouth penetration penis robot sex simple_background smile source_filmmaker_(artwork) undertale undertale_(series) 2016 digital_media_(artwork) duo erection genitals heart_symbol japanese_text machine male male/male mettaton not_furry penetrable_sex_toy penis robot semi_(artist) sex sex_toy solo_focus text toying_partner translated undertale undertale_(series) 2016 ambiguous_gender bodily_fluids clothed clothing cum digital_media_(artwork) femboy genital_fluids genitals glistening hair hair_over_eye heart_symbol humanoid machine male mettaton mettaton_ex not_furry one_eye_obstructed open_mouth penis robot simple_background smile solo tongue undertale undertale_(series) 2016 alternate_universe balls blush digital_media_(artwork) duo english_text erection fan_character femboy gaiki genitals hair heart_symbol hi_res humanoid machine male male/male mettaton mettaton_(underfell) mettaton_ex_(underfell) mettaton_neo multi_arm multi_eye multi_genitalia multi_limb multi_penis not_furry penis robot selfcest sex sharp_teeth simple_background smile square_crossover teeth text underfell undertale undertale_(series) white_background 2016 digital_media_(artwork) duo femboy glistening hair hi_res humanoid machine male male/male mettaton mettaton_ex mettaton_neo not_furry robot selfcest simple_background square_crossover undertale undertale_(series) 2016 digital_media_(artwork) duo femboy glistening hair hi_res humanoid machine male male/male mettaton mettaton_ex mettaton_neo not_furry robot selfcest simple_background square_crossover undertale undertale_(series) 2016 crossgender digital_media_(artwork) duo female femboy genitals glistening hair humanoid machine mettaton mettaton_ex not_furry pussy robot selfcest simple_background solo_focus square_crossover undertale undertale_(series) 2016 digital_media_(artwork) duo_focus erection fellatio femboy genitals group hair hotlegmeme human humanoid machine male male/male mammal mettaton mettaton_ex mettaton_neo monochrome not_furry oral penile penis robot selfcest sex simple_background square_crossover tongue undertale undertale_(series) 2016 3:4 digital_media_(artwork) femboy glistening group hair humanoid machine male male/male mettaton mettaton_ex not_furry robot selfcest simple_background soulplay square_crossover tongue undertale undertale_(series) 1:1 2016 abstract_background android black_lips digital_media_(artwork) fangs femboy glistening hair hair_over_eye headshot_portrait humanoid icon lgbt_pride lips low_res machine makeup male metallic_body mettaton mettaton_ex not_furry one_eye_obstructed portrait pride_color_background pride_colors robot robot_humanoid simple_background smile solo source_request teeth transgender_pride_colors undertale undertale_(series) unknown_artist 1boy android black_hair colored_skin glowing glowing_eye grey_skin grin male_focus mettaton mettaton_neo portrait protected_link purple_eyes redlhzz smile solo spoilers teeth undertale 1boy altimaen_iten androgynous android bad_id bad_twitter_id black_hair character_name fabulous hair_over_one_eye heart male_focus mettaton mettaton_ex solo undertale 1boy altimaen_iten androgynous android bad_id bad_twitter_id black_hair colored_skin glowing glowing_eye grey_skin heart male_focus mettaton mettaton_neo red_eyes short_hair signature solo undertale upper_body weapon abstract_background ambiguous_gender crossover earthbound_(series) electronics low_res lucas_(earthbound) machine mettaton microphone nintendo not_furry robot sean_hicks signature solo undertale undertale_(series) 1:2 2015 alphys ambiguous_gender armless before_and_after blue_body blue_skin bodily_fluids boots breasts clothed clothing comic crying cybernetics cyborg digital_media_(artwork) eyewear female footwear glasses group happy hi_res human humor isabunnie machine mammal mettaton mettaton_ex mirror monster monster_kid mtt_brand_legs open_mouth prosthetic prosthetic_arm prosthetic_limb robotics sad scalie simple_background tears teeth thought_bubble tongue tongue_out undertale undertale_(series) undyne what_has_science_done white_background wide_eyed yelling 4threset aaron_(undertale) alphys ambiguous_gender amphibian animal_humanoid animate_inanimate animated_skeleton anthro arachnid arachnid_humanoid armless arthropod arthropod_humanoid asgore_dreemurr asriel_dreemurr beard blonde_hair bone boss_monster_(undertale) bovid canid canine canis caprine chara_(undertale) domestic_cat domestic_dog elemental_creature equid equine facial_hair felid feline felis female fire fire_creature fish fish_humanoid flora_fauna flowey_the_flower frisk_(undertale) frog gaster ghost goat grillby group hair hi_res horn horse human humanoid insect lizard long_ears machine mad_dummy male mammal marine marine_humanoid mettaton monster_kid muffet napstablook papyrus_(undertale) plant reptile robot sans_(undertale) scalie shyren skeleton spider_humanoid spirit tem temmie_(undertale) toriel undead undertale undertale_(series) undyne young young_ambiguous young_anthro young_human abs black_and_white bodily_fluids cum erection femboy genital_fluids genitals glistening hair hair_over_eye hi_res hotlegmeme humanoid kneeling male mettaton mettaton_ex monochrome muscular muscular_humanoid muscular_male not_furry one_eye_obstructed penis poking_out simple_background solo undertale undertale_(series) white_background absurd_res alphys anal anal_fingering anon bedding blanket comic digital_media_(artwork) english_text fingering flowey_the_flower hi_res jet_pack long_image machine mettaton mettaton_ex microsoft_paint_(artwork) mspaintguy robot simple_background soul tall_image text undertale undertale_(series) 1other androgynous arms_up bad_id bad_pixiv_id bone bug cake chair commentary copyright_name dirt doughnut flower flower_pot flowey_(undertale) fly food fork frisk_(undertale) heart heart_necklace jewelry ketchup ketchup_bottle koto_inari locket long_sleeves meatball mettaton mettaton_(box) necklace on_chair pasta pendant shaded_face silk skull spaghetti spaghetti_and_meatballs spider spider_web spikes standing standing_on_chair standing_on_object striped_clothes striped_sweater sweater table toriel undertale black_and_white blush bone butt clothing dress duo femboy hair heart_symbol hotlegmeme machine male male/male mettaton mettaton_ex monochrome not_furry papyrus_(undertale) papyton sex simple_background skeleton undead undertale undertale_(series) white_background better_version_at_source blush clothed clothing digital_media_(artwork) duo femboy hair heart_symbol humanoid machine male male/male mettaton mettaton_ex not_furry robot selfcest simple_background smile square_crossover undertale undertale_(series) unknown_artist armless better_version_at_source black_hair boss_monster_(undertale) bovid caprine clothed clothing digital_media_(artwork) duo english_text femboy hair heart_symbol humanoid low_res machine male male/male mammal mettaton mettaton_neo not_furry open_mouth purple_background robot selfcest simple_background square_crossover text undertale undertale_(series) unknown_artist 80s album_cover cover david_axel eyeshadow hair_over_one_eye hand_over_eye highres lipstick makeup mettaton mettaton_ex new_wave_music oldschool parody portrait robot undertale alpha_channel alphys alternate_color ambiguous_gender animal_humanoid animated_skeleton armor arxielle asgore_dreemurr asriel_dreemurr beard bone boss_monster_(undertale) bovid cape caprine chara_(undertale) clothed clothing cputale crown cybernetics cyborg digital_media_(artwork) electronics elemental_creature facial_hair female fish fish_humanoid flora_fauna flower flowey_the_flower frisk_(undertale) fur ghost gloves goat group hair handwear headgear headphones hoodie horn human humanoid low_res machine male mammal marine marine_humanoid markings melee_weapon mettaton mettaton_ex microphone napstablook papyrus_(undertale) pixel_(artwork) plant polearm red_hair reptile robot sans_(undertale) scalie scarf simple_background skeleton skull smile spear spirit topwear toriel transparent_background undead undertale undertale_(series) undyne weapon white_body white_fur blush breasts crossgender duo female genitals hair hi_res hotlegmeme machine male male/female mettaton mettaton_neo not_furry pussy robot sex simple_background solo_focus undertale undertale_(series) better_version_at_source bone boots clothing coat dialogue english_text exclamation_point flower flowey_the_flower footwear humor jacket mettaton not_furry open_mouth plant profanity sans_(undertale) simple_background skeleton smile solo text topwear undead undertale undertale_(series) unknown_artist 1boy 1girl android annoying_dog armor bad_id bad_twitter_id blue_eyes bodysuit bone commentary_request crossover derivative_work dual_persona eyepatch eyeshadow fangs fins flowey_(undertale) frown genderswap gloves glowing gyosone hair_over_one_eye hand_on_forehead head_fins heart kill_la_kill kinagase_tsumugu lipstick looking_at_viewer makeup mettaton mettaton_ex microphone mikisugi_aikurou parody pink_eyes polearm ponytail purple_hair robot skin_tight smile smoking spear sticker style_parody thick_eyebrows undertale undyne weapon blush clothed clothing digital_media_(artwork) duo femboy genitals hair heart_symbol hotlegmeme humanoid machine male male/male masturbation mettaton mettaton_ex mettaton_neo monochrome not_furry penile penile_masturbation penis robot selfcest sex simple_background smile square_crossover undertale undertale_(series) 2016 bulge butt butt_shot clothed clothing digital_media_(artwork) gaiki glistening humanoid latex machine male mettaton mettaton_ex not_furry rear_view robot simple_background solo undertale undertale_(series) ambiguous_gender animated_skeleton anthro blush bone burgerpants clothed clothing dialogue digital_media_(artwork) domestic_cat duo english_text felid feline felis femboy glistening hair hi_res humanoid machine male male/male mammal mettaton mettaton_ex napstablook open_mouth papyrus_(undertale) papyton robot sans_(undertale) skeleton smile text undead undertale undertale_(series) alternate_universe bodily_fluids clothed clothing digital_media_(artwork) duo fan_character femboy hair hi_res humanoid long_hair machine male male/male mettaton mettaton_(underfell) mettaton_ex mettaton_ex_(underfell) multi_arm multi_eye multi_limb not_furry open_mouth robot sharp_teeth simple_background square_crossover tears teeth underfell undertale undertale_(series) anthro burgerpants clothed clothing dialogue digital_media_(artwork) domestic_cat drugs duo english_text felid feline felis femboy fur glistening hair hat headgear headwear humanoid long_hair machine male mammal marijuana mettaton mettaton_ex open_mouth robot simple_background smile smoking text undertale undertale_(series) 2016 2_frame_animation 2d_animation 4:3 aliasing ambiguous_gender animated digital_media_(artwork) gesture humor lenny_face low_res machine meme mettaton not_furry reaction_image robot sex_gesture short_playtime simple_background solo suggestive suggestive_gesture undertale undertale_(series) unknown_artist what white_background !? 2girls ;d aged_down alphys annoying_dog arm_wrap artist_name asgore_dreemurr bad_id bad_tumblr_id blue_skin blush boots chara_(undertale) colored_sclera colored_skin creature denim dogamy dogaressa easter easter_egg egg eyepatch eyeshadow fins flowey_(undertale) frisk_(undertale) full_body furry furry_female gills grass grillby grin happy_easter hatching head_fins makeup mettaton mettaton_ex monster_girl muffet multiple_girls muscular muscular_female nise_(wraith615) one_eye_closed onionsan open_mouth outstretched_arms paintbrush palette_(object) papyrus_(undertale) photoshop_(medium) ponytail red_eyes red_hair sans_(undertale) scar sharp_teeth simple_background sitting smile spoilers surprised sweat sweatdrop tank_top teeth temmie toriel undertale undyne w.d._gaster white_background yellow_sclera yellow_skin 1boy androgynous android black_hair chanti_(chantilin) commentary_request fabulous hair_over_one_eye heart male_focus mettaton mettaton_ex smile solo undertale 1boy commentary_request cowboy_shot crotch_grab from_below hair_over_one_eye highres legs_apart mettaton mettaton_ex photoshop_(medium) robot stage_lights tongue tongue_out undertale yondamoegi 1:1 animated black_background humor lenny_face meme mettaton not_furry reaction_image simple_background undertale undertale_(series) unknown_artist 2015 appliance better_version_at_source kitchen_appliance machine mapleleauf mettaton mtt_brand_legs not_furry robot signature simple_background solo toaster undertale undertale_(series) what_has_science_done white_background animated_skeleton anthro asgore_dreemurr beard blood bodily_fluids bone boss_monster_(undertale) bovid caprine chara_(undertale) clothed clothing dinosaur extinct facial_hair female fish flowey_the_flower frisk_(undertale) horn human machine male mammal marine mettaton mettaton_ex papyrus_(undertale) prehistoric_species reptile robot sans_(undertale) scalie simple_background skeleton sketch toriel traditional_media_(artwork) undead undertale undertale_(series) undyne unusualsombrero 2016 clothing crossgender dialogue english_text female geeflakes glistening heart_eyes heart_symbol hi_res lips machine male_(lore) mettaton mettaton_ex mtf_crossgender not_furry robot solo text undertale undertale_(series) undressing y2k_(fashion) 1other alphys androgynous annoying_dog asgore_dreemurr asriel_dreemurr bad_id bad_pixiv_id blood blood_on_clothes blood_on_hands blood_on_knife blood_on_weapon boots bratty_(undertale) brown_hair catty_(undertale) chara_(undertale) closed_eyes collared_shirt creature dogamy dogaressa doggo_(undertale) endogeny english_text everyone flowey_(undertale) full_body gotmil gradient_background grillby heart heart_necklace height_difference jewelry knife leaf mad_dummy_(undertale) madjick mettaton mettaton_ex monster_kid_(undertale) muffet napstablook necklace onionsan papyrus_(undertale) pillar plant red_background river_person_(undertale) royal_guard_01_(undertale) royal_guard_02_(undertale) sans_(undertale) shirt shorts shyren simple_background sitting smile spoilers standing striped_clothes striped_shirt temmie toriel tray tsunderplane undertale undyne vines w.d._gaster weapon 3boys 3girls =_= androgynous animated animated_gif armor arthropod_girl black_hair blue_eyes bone brown_hair c: closed_eyes colored_sclera colored_skin cup energy_spear everyone extra_arms extra_eyes eyelashes eyepatch fangs food frisk_(undertale) furry gameplay_mechanics gloves glowing glowing_eye graph graph_(object) grin hair_over_one_eye hair_ribbon heart heart_on_chest horns jacket knife lowres mettaton mettaton_ex monster muffet's_pet multiple_boys multiple_girls mystery_skulls one_eye_closed open_mouth papyrus_(undertale) parody pie polearm ponytail purple_skin red_eyes red_hair ribbon sans_(undertale) scarf sharp_teeth shirt short_twintails skeleton skull smile snow spear spider_girl spoilers striped_clothes striped_shirt teacup teeth tongue tongue_out toriel twintails undertale undyne unoobang weapon yellow_sclera yellow_teeth