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asgore_dreemurr bailey1rox black_hair burgerpants cum cum_in_mouth cum_on_body eyelashes female female_focus hair_over_one_eye handjob mettaton mettaton_ex multiple_boys multiple_males multiple_penises nicecream_man penis pink_eyes precum robot robot_girl robot_humanoid short_hair straight tongue tongue_out undertale undertale_(series) veiny_penis
asgore_dreemurr bailey1rox black_hair burgerpants cum cum_in_mouth cum_on_body eyelashes female female_focus hair_over_one_eye handjob mettaton mettaton_ex multiple_boys multiple_males multiple_penises nicecream_man penis pink_eyes precum robot robot_girl robot_humanoid short_hair straight tongue tongue_out undertale undertale_(series) veiny_penis
1boy android black_hair boots crossed_arms dual_persona hair_over_one_eye high_heel_boots high_heels himawari_kappa crossed_legs male_focus mettaton mettaton_ex sitting smile undertale
1boy android black_hair boots crossed_arms dual_persona hair_over_one_eye high_heel_boots high_heels himawari_kappa crossed_legs male_focus mettaton mettaton_ex sitting smile undertale
3girls 5boys alphys androgynous annoying_dog asgore_dreemurr asriel_dreemurr beard bird black_eyes blonde_hair bossmonsterbani brown_hair cave chara_(undertale) dog eyepatch facial_hair flower flowey_(undertale) frisk_(undertale) furry furry_female furry_male ghost good_end highres hood hoodie horns mettaton mettaton_ex monster_boy monster_girl multiple_boys multiple_girls papyrus_(undertale) ruins sans_(undertale) shirt skeleton spoilers stick striped_clothes striped_shirt sunset toriel undertale undyne
3girls 5boys alphys androgynous annoying_dog asgore_dreemurr asriel_dreemurr beard bird black_eyes blonde_hair bossmonsterbani brown_hair cave chara_(undertale) dog eyepatch facial_hair flower flowey_(undertale) frisk_(undertale) furry furry_female furry_male ghost good_end highres hood hoodie horns mettaton mettaton_ex monster_boy monster_girl multiple_boys multiple_girls papyrus_(undertale) ruins sans_(undertale) shirt skeleton spoilers stick striped_clothes striped_shirt sunset toriel undertale undyne
1boy boots english_text full_body hair_over_one_eye hato_moa high_heel_boots high_heels mettaton mettaton_ex microphone moana_(movie) music signature singing sparkle spotlight standing undertale
1boy boots english_text full_body hair_over_one_eye hato_moa high_heel_boots high_heels mettaton mettaton_ex microphone moana_(movie) music signature singing sparkle spotlight standing undertale
1boy android bishounen black_hair blue_background crossed_arms eyelashes gloves hair_over_one_eye himawari_kappa crossed_legs licking licking_finger looking_at_viewer male_focus mars_symbol mettaton mettaton_ex microphone multicolored_background open_mouth pink_background purple_background sitting undertale venus_symbol
1boy android bishounen black_hair blue_background crossed_arms eyelashes gloves hair_over_one_eye himawari_kappa crossed_legs licking licking_finger looking_at_viewer male_focus mars_symbol mettaton mettaton_ex microphone multicolored_background open_mouth pink_background purple_background sitting undertale venus_symbol
1girl 2boys alternate_costume alternate_hair_length alternate_hairstyle android arthropod_girl artist_name black_hair dress extra_arms extra_eyes formal hand_fan hat highres mettaton mettaton_ex monster_girl muffet multiple_boys papyrus_(undertale) rotodisk scarf skeleton suit sunglasses top_hat undertale
1girl 2boys alternate_costume alternate_hair_length alternate_hairstyle android arthropod_girl artist_name black_hair dress extra_arms extra_eyes formal hand_fan hat highres mettaton mettaton_ex monster_girl muffet multiple_boys papyrus_(undertale) rotodisk scarf skeleton suit sunglasses top_hat undertale
1boy alphys amazon_(company) animal_crossing arm_up arrow_(symbol) artist_self-insert bad_id bad_pixiv_id bags_under_eyes beau_(animal_crossing) black_pants black_shirt blue_eyes blue_hoodie blurry bobobo-bo_bo-bobo bobobo-bo_bo-bobo_(character) bowl box brown_hair cable callie_(splatoon) cardboard_box chair chopsticks commentary_request depth_of_field eating ema fate/grand_order fate_(series) frisk_(undertale) fujikido_kenji gloves glowing glowing_eyes grey_socks hair_between_eyes heart highres holding holding_bowl holding_chopsticks hood hood_down hoodie indoors inkling isabelle_(animal_crossing) james_moriarty_(archer)_(fate) judd_(splatoon) kashu_(hizake) kirby kirby_(series) leg_up li'l_judd_(splatoon) link logo long_hair long_sleeves looking_at_viewer male_focus marina_(splatoon) mettaton mettaton_ex modem monitor monster_hunter monster_hunter:_world monster_hunter_(series) muffet ninja_slayer nintendo octoling office_chair original pants paper papyrus_(undertale) partially_fingerless_gloves pearl_(splatoon) pushpin sanpaku sans_(undertale) screen_light shirt sitting smiley_face socks solo splatoon_(series) splatoon_2 swivel_chair t-shirt the_legend_of_zelda the_legend_of_zelda:_breath_of_the_wild thumbtack toriel twitter twitter_username undertale undyne unzipped zipper
1boy alphys amazon_(company) animal_crossing arm_up arrow_(symbol) artist_self-insert bad_id bad_pixiv_id bags_under_eyes beau_(animal_crossing) black_pants black_shirt blue_eyes blue_hoodie blurry bobobo-bo_bo-bobo bobobo-bo_bo-bobo_(character) bowl box brown_hair cable callie_(splatoon) cardboard_box chair chopsticks commentary_request depth_of_field eating ema fate/grand_order fate_(series) frisk_(undertale) fujikido_kenji gloves glowing glowing_eyes grey_socks hair_between_eyes heart highres holding holding_bowl holding_chopsticks hood hood_down hoodie indoors inkling isabelle_(animal_crossing) james_moriarty_(archer)_(fate) judd_(splatoon) kashu_(hizake) kirby kirby_(series) leg_up li'l_judd_(splatoon) link logo long_hair long_sleeves looking_at_viewer male_focus marina_(splatoon) mettaton mettaton_ex modem monitor monster_hunter monster_hunter:_world monster_hunter_(series) muffet ninja_slayer nintendo octoling office_chair original pants paper papyrus_(undertale) partially_fingerless_gloves pearl_(splatoon) pushpin sanpaku sans_(undertale) screen_light shirt sitting smiley_face socks solo splatoon_(series) splatoon_2 swivel_chair t-shirt the_legend_of_zelda the_legend_of_zelda:_breath_of_the_wild thumbtack toriel twitter twitter_username undertale undyne unzipped zipper
2016 animated_skeleton black_hair blue_eyes boots bound_wrists clothed collar collar_and_leash heart hoodie humanoid humanoid_robot ifuckboxppl leash leash_and_collar leash_pull licking_lips male mettaton mettaton_ex pink_boots robot robot_humanoid sans sans_(undertale) simple_background skeleton straddling undead undertale undertale_(series) yaoi
2016 animated_skeleton black_hair blue_eyes boots bound_wrists clothed collar collar_and_leash heart hoodie humanoid humanoid_robot ifuckboxppl leash leash_and_collar leash_pull licking_lips male mettaton mettaton_ex pink_boots robot robot_humanoid sans sans_(undertale) simple_background skeleton straddling undead undertale undertale_(series) yaoi
1:1 1:1_aspect_ratio animated_skeleton artist_request blush hair_over_one_eye humanoid_robot male mettaton mettaton_ex nervous penis pink_background robot robot_humanoid sans sans_(undertale) simple_background skeleton undead undertale undertale_(series) yaoi
1:1 1:1_aspect_ratio animated_skeleton artist_request blush hair_over_one_eye humanoid_robot male mettaton mettaton_ex nervous penis pink_background robot robot_humanoid sans sans_(undertale) simple_background skeleton undead undertale undertale_(series) yaoi
1girl android black_hair breasts gender_request genderswap genderswap_(mtf) hair_over_one_eye mettaton mettaton_ex pink_eyes short_hair solo undertale
1girl android black_hair breasts gender_request genderswap genderswap_(mtf) hair_over_one_eye mettaton mettaton_ex pink_eyes short_hair solo undertale
2boys amakusa_(hidorozoa) closed_mouth double_w hair_over_one_eye hand_up heart high_heels holding looking_at_viewer mettaton mettaton_ex microphone multiple_boys pink_background red_eyes robot short_hair simple_background smile undertale w
2boys amakusa_(hidorozoa) closed_mouth double_w hair_over_one_eye hand_up heart high_heels holding looking_at_viewer mettaton mettaton_ex microphone multiple_boys pink_background red_eyes robot short_hair simple_background smile undertale w
1boy 1girls anus cowgirl_position crossover drooling female female_penetrated femdom homestuck horns humanoid humanoid_robot lenthelemon looking_back looking_behind male male_penetrating male_penetrating_female malesub mettaton mettaton_ex penis penis_in_pussy power_bottom pussy robot robot_humanoid robotic_penis simple_background straight terezi_pyrope testicles undertale undertale_(series)
1boy 1girls anus cowgirl_position crossover drooling female female_penetrated femdom homestuck horns humanoid humanoid_robot lenthelemon looking_back looking_behind male male_penetrating male_penetrating_female malesub mettaton mettaton_ex penis penis_in_pussy power_bottom pussy robot robot_humanoid robotic_penis simple_background straight terezi_pyrope testicles undertale undertale_(series)
... animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub clothed duo english_text glowing_eye hair_over_one_eye humanoid humanoid_robot imminent_spanking mettaton mettaton_ex monster punishment robot_humanoid sans sans_(undertale) skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk text undead undertale undertale_(series) unknown_artist white_background
... animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub clothed duo english_text glowing_eye hair_over_one_eye humanoid humanoid_robot imminent_spanking mettaton mettaton_ex monster punishment robot_humanoid sans sans_(undertale) skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk text undead undertale undertale_(series) unknown_artist white_background
2010s 2016 2boys ahoge animated_skeleton artist_request blue_blush blue_tongue blush boots clothed clothing crying drooling fangs high_heel_boots hooded_jacket hoodie humanoid humanoid_robot jacket licking_tongue making_out male male/male male_only mettaton mettaton_ex monster robot robot_humanoid sans sans_(undertale) skeleton sketch sweat tears tongue tongue_out trembling undead undertale undertale_(series) white_background yaoi
2010s 2016 2boys ahoge animated_skeleton artist_request blue_blush blue_tongue blush boots clothed clothing crying drooling fangs high_heel_boots hooded_jacket hoodie humanoid humanoid_robot jacket licking_tongue making_out male male/male male_only mettaton mettaton_ex monster robot robot_humanoid sans sans_(undertale) skeleton sketch sweat tears tongue tongue_out trembling undead undertale undertale_(series) white_background yaoi
androgynous black_hair clitoris female female_only hair_over_one_eye high_heels_boots mettaton mettaton_ex peeing pink_boots pink_pussy pink_vagina piss pussy ripped_clothing robot robot_girl shadyhouse short_hair solo spread_pussy uncensored undertale undertale_(series)
androgynous black_hair clitoris female female_only hair_over_one_eye high_heels_boots mettaton mettaton_ex peeing pink_boots pink_pussy pink_vagina piss pussy ripped_clothing robot robot_girl shadyhouse short_hair solo spread_pussy uncensored undertale undertale_(series)
animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub clothed crazy_eyes crazy_smile duo english_text hair_over_one_eye humanoid humanoid_robot mettaton mettaton_ex monster onomatopoeia punishment robot_humanoid sans sans_(undertale) skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk spanking spanking_ass spanking_butt sweat text undead undertale undertale_(series) unknown_artist white_background
animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub clothed crazy_eyes crazy_smile duo english_text hair_over_one_eye humanoid humanoid_robot mettaton mettaton_ex monster onomatopoeia punishment robot_humanoid sans sans_(undertale) skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk spanking spanking_ass spanking_butt sweat text undead undertale undertale_(series) unknown_artist white_background
1boy android black_hair broken clenched_teeth graphite_(medium) greyscale heart highres looking_down male_focus mettaton mettaton_ex monochrome monochrome reticulum spread_legs teeth traditional_media undertale wire
1boy android black_hair broken clenched_teeth graphite_(medium) greyscale heart highres looking_down male_focus mettaton mettaton_ex monochrome monochrome reticulum spread_legs teeth traditional_media undertale wire
2010s 2015 2boys animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots box dominant dominant_male domination ectotongue english_text glowing_eyes hair_over_one_eye high_heel_boots humanoid_robot larger_male licking_leg male male/male male_only maledom mettaton mettaton_ex monster naked nude penis pink_boots pink_eyes pink_glans pink_tongue robot robot_humanoid robotic_penis sans sans_(undertale) simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive text tongue undead undertale undertale_(series) what yaoi
2010s 2015 2boys animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots box dominant dominant_male domination ectotongue english_text glowing_eyes hair_over_one_eye high_heel_boots humanoid_robot larger_male licking_leg male male/male male_only maledom mettaton mettaton_ex monster naked nude penis pink_boots pink_eyes pink_glans pink_tongue robot robot_humanoid robotic_penis sans sans_(undertale) simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive text tongue undead undertale undertale_(series) what yaoi
1boy androgynous android arm_support ass black_hair blush bulge hair_over_one_eye heart highres lips looking_at_viewer male_focus mettaton mettaton_ex naughty_face ngtt parted_lips simple_background sitting smile spread_legs undertale white_background
1boy androgynous android arm_support ass black_hair blush bulge hair_over_one_eye heart highres lips looking_at_viewer male_focus mettaton mettaton_ex naughty_face ngtt parted_lips simple_background sitting smile spread_legs undertale white_background
1girl android black_hair breasts covered_erect_nipples flashing gender_request genderswap genderswap_(mtf) hair_over_one_eye mettaton mettaton_ex nipples pussy shirt short_hair skirt solo thighhighs translation_request undertale
1girl android black_hair breasts covered_erect_nipples flashing gender_request genderswap genderswap_(mtf) hair_over_one_eye mettaton mettaton_ex nipples pussy shirt short_hair skirt solo thighhighs translation_request undertale
2010s 2016 2boys animated_skeleton black_background blindfold blindfolded bondage dark_background dominant dominant_male domination femboy femboydom high_heels highleg humanoid humanoid_robot male male/male male_only maledom mettaton mettaton_ex naked nude pink_boots robot robot_boy robot_femboy robot_humanoid sans sans_(undertale) sinisk skeleton stepped_on submissive undead undertale undertale_(series) yaoi
2010s 2016 2boys animated_skeleton black_background blindfold blindfolded bondage dark_background dominant dominant_male domination femboy femboydom high_heels highleg humanoid humanoid_robot male male/male male_only maledom mettaton mettaton_ex naked nude pink_boots robot robot_boy robot_femboy robot_humanoid sans sans_(undertale) sinisk skeleton stepped_on submissive undead undertale undertale_(series) yaoi
1boy android bkub black_background boots full_body greyscale heart high_heel_boots high_heels legs_apart looking_at_viewer male_focus mettaton mettaton_ex monochrome simple_background smile smoke solo undertale wide_stance
1boy android bkub black_background boots full_body greyscale heart high_heel_boots high_heels legs_apart looking_at_viewer male_focus mettaton mettaton_ex monochrome simple_background smile smoke solo undertale wide_stance
1boy 1girls anon big_boobs big_breasts black_hair boobs breasts caressing_head head_between_breasts high_heel_boots jamesab laying_on_breasts mettaton mettaton_ex pink_lipstick pink_nipples robot robot_girl robot_humanoid short_hair tits undertale undertale_(series)
1boy 1girls anon big_boobs big_breasts black_hair boobs breasts caressing_head head_between_breasts high_heel_boots jamesab laying_on_breasts mettaton mettaton_ex pink_lipstick pink_nipples robot robot_girl robot_humanoid short_hair tits undertale undertale_(series)
2boys animated_skeleton blue_blush blue_penis ectopenis english_text gay grey_background hooded_jacket hoodie humanoid humanoid_robot jacket looking_away male male/male male_only mettaton mettaton_ex monochrome monster penis robot robot_humanoid sans sans_(undertale) shirt_lift shirt_pulled_up shirt_up simple_background skeleton small_penis solid_color_background sweat text text_bubble undead undertale undertale_(series) unknown_artist yaoi
2boys animated_skeleton blue_blush blue_penis ectopenis english_text gay grey_background hooded_jacket hoodie humanoid humanoid_robot jacket looking_away male male/male male_only mettaton mettaton_ex monochrome monster penis robot robot_humanoid sans sans_(undertale) shirt_lift shirt_pulled_up shirt_up simple_background skeleton small_penis solid_color_background sweat text text_bubble undead undertale undertale_(series) unknown_artist yaoi
! !! 1other ^_^ androgynous android blush boots brown_hair closed_eyes colored_skin comforting flying_sweatdrops frisk_(undertale) ghost gloves group_hug hair_over_one_eye headphones hug kneeling laughing long_sleeves mettaton mettaton_ex napstablook outstretched_arms pink_footwear shake_sawa shirt shorts simple_background smile standing striped_clothes striped_shirt tears transparent undertale white_background yellow_skin
! !! 1other ^_^ androgynous android blush boots brown_hair closed_eyes colored_skin comforting flying_sweatdrops frisk_(undertale) ghost gloves group_hug hair_over_one_eye headphones hug kneeling laughing long_sleeves mettaton mettaton_ex napstablook outstretched_arms pink_footwear shake_sawa shirt shorts simple_background smile standing striped_clothes striped_shirt tears transparent undertale white_background yellow_skin
1girl android chart closed_mouth dress elizabeth_bathory_(fate) fake_screenshot fate/grand_order fate_(series) horns mecha_eli-chan_(fate) mettaton mettaton_ex michiru_(amphibian) parody pixel_art short_dress sleeveless sleeveless_dress smile solo translation_request undertale
1girl android chart closed_mouth dress elizabeth_bathory_(fate) fake_screenshot fate/grand_order fate_(series) horns mecha_eli-chan_(fate) mettaton mettaton_ex michiru_(amphibian) parody pixel_art short_dress sleeveless sleeveless_dress smile solo translation_request undertale
animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub clothed duo english_text hair_over_one_eye humanoid humanoid_robot imminent_spanking mettaton mettaton_ex monster punishment robot_humanoid sans sans_(undertale) skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom text undead undertale undertale_(series) unknown_artist white_background
animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub clothed duo english_text hair_over_one_eye humanoid humanoid_robot imminent_spanking mettaton mettaton_ex monster punishment robot_humanoid sans sans_(undertale) skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom text undead undertale undertale_(series) unknown_artist white_background
1boy android armor arms_up boots grey_background hair_over_one_eye heart high_heel_boots high_heels himawari_kappa knee_boots looking_to_the_side male_focus mettaton mettaton_ex pauldrons shoulder_armor simple_background solo spread_legs tongue tongue_out undertale
1boy android armor arms_up boots grey_background hair_over_one_eye heart high_heel_boots high_heels himawari_kappa knee_boots looking_to_the_side male_focus mettaton mettaton_ex pauldrons shoulder_armor simple_background solo spread_legs tongue tongue_out undertale
2010s 2016 animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male hoodie humanoid_robot larger_male male maledom mettaton mettaton_ex monster penis robot robot_humanoid robotic_penis sans sans_(undertale) skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom undead undertale undertale_(series) wearing_others_clothes yaoi
2010s 2016 animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male hoodie humanoid_robot larger_male male maledom mettaton mettaton_ex monster penis robot robot_humanoid robotic_penis sans sans_(undertale) skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom undead undertale undertale_(series) wearing_others_clothes yaoi
1:1 1:1_aspect_ratio 2010s 2016 2boys animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male black_background black_hair blue_hoodie blue_jacket blue_tongue clothed dark_background ectotongue fel-fisk femboy gay glowing high_heel_boots high_heels hooded_jacket hoodie humanoid_robot jacket larger_male licking male male/male male_only mettaton mettaton_ex one_eye_closed partially_clothed partially_nude pink_eyes pink_tongue robot robot_boy robot_femboy robot_humanoid sans sans_(undertale) skeleton slippers small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom soul soul_sex sweat tongue tongue_out undead undertale undertale_(series) yaoi
1:1 1:1_aspect_ratio 2010s 2016 2boys animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male black_background black_hair blue_hoodie blue_jacket blue_tongue clothed dark_background ectotongue fel-fisk femboy gay glowing high_heel_boots high_heels hooded_jacket hoodie humanoid_robot jacket larger_male licking male male/male male_only mettaton mettaton_ex one_eye_closed partially_clothed partially_nude pink_eyes pink_tongue robot robot_boy robot_femboy robot_humanoid sans sans_(undertale) skeleton slippers small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom soul soul_sex sweat tongue tongue_out undead undertale undertale_(series) yaoi
2others arm_up artist_name beach closed_eyes cloud day facing_viewer food ghost gloves hat heart maa_tc mettaton mettaton_ex multiple_others napstablook ocean open_mouth outdoors palm_tree popsicle robot sparkle straw_hat sun_hat tree umbrella undertale white_gloves
2others arm_up artist_name beach closed_eyes cloud day facing_viewer food ghost gloves hat heart maa_tc mettaton mettaton_ex multiple_others napstablook ocean open_mouth outdoors palm_tree popsicle robot sparkle straw_hat sun_hat tree umbrella undertale white_gloves
1girl android breasts cleavage gender_request genderswap genderswap_(mtf) glasses hair_over_one_eye mettaton mettaton_ex pink_eyes solo undertale
1girl android breasts cleavage gender_request genderswap genderswap_(mtf) glasses hair_over_one_eye mettaton mettaton_ex pink_eyes solo undertale
1girls big_ass big_butt black_hair cameltoe felice-chan female female_only glasses hair_over_one_eye high_heel_boots mettaton mettaton_ex pink_boots robot robot_girl robot_humanoid short_hair solo solo_female two_tone_hair undertale undertale_(series)
1girls big_ass big_butt black_hair cameltoe felice-chan female female_only glasses hair_over_one_eye high_heel_boots mettaton mettaton_ex pink_boots robot robot_girl robot_humanoid short_hair solo solo_female two_tone_hair undertale undertale_(series)
2boys blue_hair boots bubble_pop_sdk deltarune epaulettes gloves hair_over_one_eye knee_boots male_focus mettaton mettaton_ex multiple_boys pointing robot rouxls_kaard simple_background undertale uniform yellow_background
2boys blue_hair boots bubble_pop_sdk deltarune epaulettes gloves hair_over_one_eye knee_boots male_focus mettaton mettaton_ex multiple_boys pointing robot rouxls_kaard simple_background undertale uniform yellow_background
2010s 2016 2boys animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller dark_background glowing hornyraptor humanoid humanoid_robot larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating mettaton mettaton_ex missionary_position penetration robot robot_humanoid sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom thrusting undead undertale undertale_(series) yaoi
2010s 2016 2boys animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller dark_background glowing hornyraptor humanoid humanoid_robot larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating mettaton mettaton_ex missionary_position penetration robot robot_humanoid sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom thrusting undead undertale undertale_(series) yaoi
animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_hair blue_blush blush completely_naked completely_nude grabbing_arms hair_over_one_eye humanoid humanoid_robot larger_penetrating larger_penetrating_smaller legs_spread licking licking_head male male_penetrating mettaton mettaton_ex naked nude penetration pink_blush pink_eyes robot robot_humanoid robotic_penis sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs sweat trembling_legs undead undertale undertale_(series) white_background yaoi
animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_hair blue_blush blush completely_naked completely_nude grabbing_arms hair_over_one_eye humanoid humanoid_robot larger_penetrating larger_penetrating_smaller legs_spread licking licking_head male male_penetrating mettaton mettaton_ex naked nude penetration pink_blush pink_eyes robot robot_humanoid robotic_penis sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs sweat trembling_legs undead undertale undertale_(series) white_background yaoi