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2015 accessory alpha_channel alternate_universe alternative_fashion ambiguous_gender animal_humanoid animated_skeleton anthro arachnid arachnid_humanoid arthropod arthropod_humanoid black_eyes black_hair bone bow_(feature) bow_accessory bow_ribbon bow_tie bravocrow bread brown_hair carhop chair child cigarette clothing croissant dessert doughnut english_text eyewear fangs female feral food footwear frisk_(undertale) furniture glasses grey_body grey_skin group hair hair_accessory hair_bow hair_ribbon hi_res hoodie human humanoid inline_skates j-fashion male mammal muffet muffet_(underswap) multi_arm multi_eye multi_limb ouji_(fashion) papyrus_(underswap) papyrus_(undertale) pastry plate ribbons role_reversal roller_skates sans_(underswap) sign simple_background skeleton smile smoke smoking spider_humanoid table teeth text topwear transparent_background twin_bows twin_hair_bows undead underswap undertale undertale_(series) waiter young

3:1 absurd_res alternate_universe animated_skeleton bone boots chain clothed clothing echotale fan_character footwear gold_(metal) gold_tooth group hi_res hoodie jacket littletale male not_furry outertale sans_(echotale) sans_(littletale) sans_(outertale) sans_(underfell) sans_(underswap) sans_(undertale) shirt shoes simple_background skeleton slippers thescarred_(artist) topwear undead underfell underswap undertale undertale_(series)

1:1 5_fingers absurd_res alternate_universe animated_skeleton armor black_sclera blue_eyes bone boots bottomwear cargo_shorts cigar clothed clothing duo fan_character fingers footwear fully_clothed gloves hand_in_pocket hands_in_both_pockets handwear heart_symbol hi_res hoodie male not_furry pants papyrus_(underswap) papyrus_(undertale) pockets sans_(underswap) sans_(undertale) shoes shorts shoulder_guards simple_background skeleton smile smoke smoking standing sweater teeth thescarred_(artist) topwear undead underswap undertale undertale_(series) white_background

accessory alternate_universe animated_skeleton blue_eyes bone cigarette clothed clothing coffee_mug container cracked_skull cross-popping_vein cup echotale english_text eyewear glasses gloves gold_(metal) gold_tooth handwear holding_container holding_cup holding_object hoodie humanoid jacket male multiple_images necktie not_furry outertale red_eyes sans_(echotale) sans_(outertale) sans_(underfell) sans_(underswap) sans_(undertale) scarf science_sans sharp_teeth simple_background skeleton smile smoke smoking solo sparkles teeth text time_skip time_travel time_traveler toono_(artist) topwear undead underfell underswap undertale undertale_(series) vein white_background yellow_eyes

alternate_universe animated_skeleton animextremex annoyed blue_eyes bone duo english_text happy hug not_furry red_eyes sans_(underfell) sans_(underswap) skeleton text undead underfell underswap undertale undertale_(series)

16:9 alternate_universe animated animated_gif animated_skeleton anterior_nasal_aperture bone clothed clothing epilepsy_warning errortale gaster_blaster glitch hoodie humanoid jacket kana_the_drifter not_furry sans_(errortale) sans_(underfell) sans_(underswap) sans_(undertale) scarf short_playtime skeleton skull solo string topwear undead underfell underswap undertale undertale_(series) weapon widescreen

1:1 animated_skeleton bed blue_eyes blush bodily_fluids bone brother_(lore) brothers_(lore) comic comic_sans dialogue digital_media_(artwork) duo ellipsis english_text erection exclamation_point furniture genitals glowing glowing_genitalia glowing_penis heart_symbol humanoid humanoid_genitalia humanoid_penis incest_(lore) kissing lizheru lying male male/male multiple_scenes not_furry papyrus_(font) papyrus_(underswap) papyrus_(undertale) penis question_mark sans_(underswap) sans_(undertale) sibling_(lore) sitting skeleton sweat tears text tongue undead undertale undertale_(series) url

1:1 anal anal_penetration animated_skeleton bed blue_eyes blush bodily_fluids bone brother_(lore) brothers_(lore) comic comic_sans dialogue digital_media_(artwork) duo ellipsis english_text erection furniture genitals glowing glowing_genitalia glowing_penis hand_holding heart_symbol humanoid_genitalia humanoid_penis incest_(lore) kissing lizheru lying male male/male male_penetrated male_penetrating male_penetrating_male multiple_scenes not_furry papyrus_(font) papyrus_(underswap) papyrus_(undertale) penetration penis question_mark romantic romantic_couple sans_(underswap) sans_(undertale) sex sibling_(lore) sitting skeletal_anus skeleton sweat tears text tongue undead undertale undertale_(series) url

1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bodily_fluids bone brother_(lore) brothers_(lore) comic comic_sans dialogue digital_media_(artwork) english_text eyes_closed heart_symbol hug incest_(lore) lizheru male male/male monster multiple_scenes not_furry papyrus_(font) papyrus_(underswap) papyrus_(undertale) sans_(underswap) sans_(undertale) sibling_(lore) skeleton sleeping sweat text undead underswap undertale undertale_(series) url

1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bodily_fluids bone brother_(lore) brothers_(lore) comic comic_sans dialogue digital_media_(artwork) english_text eyes_closed heart_symbol hug incest_(lore) licking lizheru male male/male monster multiple_scenes not_furry papyrus_(underswap) papyrus_(undertale) sans_(underswap) sans_(undertale) sibling_(lore) skeleton sleeping soul soul_lick sweat text tongue tongue_out undead underswap undertale undertale_(series) url

1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone brother_(lore) brothers_(lore) comic comic_sans dialogue digital_media_(artwork) duo english_text erection genitals glowing glowing_genitalia glowing_penis humanoid_genitalia humanoid_penis incest_(lore) lizheru male male/male monster multiple_scenes not_furry papyrus_(underswap) papyrus_(undertale) penis sans_(underswap) sans_(undertale) sibling_(lore) skeleton sleeping text undead underswap undertale undertale_(series) url

1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone brother_(lore) brothers_(lore) comic comic_sans dialogue digital_media_(artwork) duo english_text erection eyes_closed fellatio genitals glowing glowing_genitalia glowing_penis humanoid_genitalia humanoid_penis incest_(lore) licking lizheru male male/male monster multiple_scenes not_furry oral papyrus_(underswap) papyrus_(undertale) penile penis rubbing sans_(underswap) sans_(undertale) sex sibling_(lore) skeleton sleeping sucking text tongue tongue_out undead underswap undertale undertale_(series) url

1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone brother_(lore) brothers_(lore) comic comic_sans dialogue digital_media_(artwork) duo english_text erection eyes_closed fellatio genitals glowing glowing_genitalia glowing_penis humanoid_genitalia humanoid_penis incest_(lore) lizheru male male/male monster multiple_scenes not_furry oral papyrus_(font) papyrus_(underswap) papyrus_(undertale) penile penis rubbing sans_(underswap) sans_(undertale) sex sibling_(lore) skeleton sleeping sucking text undead underswap undertale undertale_(series) url

1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone brother_(lore) brothers_(lore) comic comic_sans dialogue digital_media_(artwork) duo english_text erection eyes_closed fellatio genitals glowing glowing_genitalia glowing_penis humanoid_genitalia humanoid_penis incest_(lore) licking lizheru male male/male monster multiple_scenes not_furry oral papyrus_(font) papyrus_(underswap) papyrus_(undertale) penile penis rubbing sans_(underswap) sans_(undertale) sex sibling_(lore) skeleton sleeping sucking text tongue tongue_out undead underswap undertale undertale_(series) url

1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bodily_fluids bone brother_(lore) brothers_(lore) comic comic_sans cum cum_in_mouth cum_inside dialogue digital_media_(artwork) drooling duo english_text erection eyes_closed fellatio genital_fluids genitals glowing glowing_cum glowing_genitalia glowing_penis glowing_tongue humanoid_genitalia humanoid_penis incest_(lore) licking lizheru male male/male monster multiple_scenes not_furry oral orgasm papyrus_(font) papyrus_(underswap) papyrus_(undertale) penile penis rubbing saliva sans_(underswap) sans_(undertale) sex sibling_(lore) skeleton sleeping sucking surprised tears text tongue tongue_out undead underswap undertale undertale_(series) unusual_bodily_fluids unusual_cum unusual_genital_fluids url

2d_animation 3:2 alternate_universe animated animated_gif animated_skeleton blue_eyes blush bone brother_(lore) brothers_(lore) deep_throat duo erection fellatio frame_by_frame genitals humanoid humanoid_penetrated incest_(lore) lizheru loop magma_penis male male/male male_penetrated male_penetrating male_penetrating_male not_furry oral oral_only oral_penetration papyrus_(underswap) penetration penile penile_penetration penis penis_in_mouth sans_(underswap) sex short_playtime sibling_(lore) skeleton solo_focus undead underswap undertale undertale_(series)

absurd_res alternate_universe angry animated_skeleton bone boss_monster_(undertale) bovid cape caprine clothed clothing comic crown english_text eyes_closed female flower gold_(metal) gold_tooth happy headgear hi_res hoodie horn laugh long_image male mammal marl-arts plant robe sans_(underfell) sans_(underswap) sans_(undertale) sharp_teeth skeleton sleeping smile tall_image teeth text topwear toriel toriel_(underfell) toriel_(underswap) undead underfell underswap undertale undertale_(series)

1:1 alternate_universe animated_skeleton blush bone cigarette clothed clothing group implied_incest incest_(lore) lizheru looking_at_viewer male male/male not_furry papyrus_(underswap) red_eyes sans_(underfell) sans_(underswap) skeleton smile suggestive tongue undead underfell underswap undertale undertale_(series)

1:1 2016 alternate_universe animated_skeleton blush bone brother_(lore) brothers_(lore) cigarette clothed clothed_sex clothing collaborative collaborative_fellatio collaborative_oral collaborative_sex erection fellatio furniture genitals glowing glowing_genitalia glowing_penis group humanoid_genitalia humanoid_penis incest_(lore) licking lizheru looking_at_viewer male male/male monster not_furry oral papyrus_(underswap) penile penis penis_lick red_eyes sans_(underfell) sans_(underswap) sex sibling_(lore) skeleton smile smoking sofa tongue tongue_out undead underfell underswap undertale undertale_(series)

alpha_channel alternate_universe animated_skeleton bone boots cape clothed clothing eyes_closed footwear gloves handwear humanoid itsrainingpotato_(artist) kerchief low_res male not_furry sans_(underswap) sans_(undertale) shoes simple_background skeleton smile solo standing star translucent transparent_background undead underswap undertale undertale_(series)

alphys alphys_(underswap) alternate_universe animal_humanoid arachnid arachnid_humanoid armor arthropod arthropod_humanoid bar_stool book boss_monster_(undertale) bovid bow_(feature) bow_tie caprine chara_(underswap) chara_(undertale) clothing coat door english_text eyewear facial_hair furniture glasses group hair hair_bun hoodie humanoid kerchief lab_coat mammal min-play_(artist) monochrome muffet muffet_(underswap) mustache papyrus_(underswap) papyrus_(undertale) sans_(underswap) sans_(undertale) spider_humanoid stool text topwear toriel underswap undertale undertale_(series) undyne undyne_(underswap) window

3:5 alternate_universe animated_skeleton blue_eyes blush bone caught_in_the_act clothing comic dialogue english_text male not_furry nsfwshamecave papyrus_(underfell) sans_(underswap) skeleton text undead underfell underswap undertale undertale_(series)

3:5 alternate_universe animated_skeleton blue_eyes blush bodily_fluids bone clothing comic dialogue english_text male not_furry nsfwshamecave papyrus_(underfell) sans_(underswap) skeleton sweat text undead underfell underswap undertale undertale_(series)

3:5 alternate_universe animated_skeleton blue_eyes blush bodily_fluids bone caught_in_the_act collar comic dialogue duo ellipsis english_text heart_symbol interrobang leash male male/male mistaken_identity multiple_scenes not_furry nsfwshamecave papyrus_(underfell) red_eyes sans_(underfell) sans_(underswap) skeleton submissive submissive_male suggestive surprised sweat text undead underfell underswap undertale undertale_(series)

1:1 2_frame_animation alternate_universe angry animated animated_gif animated_skeleton blue_eyes blush bone brother_(lore) brothers_(lore) clothed clothed_sex clothing collar confusion dominant dominant_male ellipsis erection fellatio genitals group heart_symbol humanoid humanoid_on_humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest_(lore) leash loop male male/male male_penetrated male_penetrating male_penetrating_male mistaken_identity not_furry nsfwshamecave oral oral_only oral_penetration papyrus_(underfell) penetration penile penile_penetration penis penis_in_mouth question_mark sans_(underfell) sans_(underswap) sex short_playtime sibling_(lore) skeleton slideshow submissive submissive_male undead underfell underswap undertale undertale_(series)

alternate_universe anal anal_penetration animated_skeleton blush bodily_fluids bone breath clothed clothed_sex clothing cowboy digital_media_(artwork) duo erection genital_fluids genitals hi_res magic magic_flesh magic_penis male male/male male_penetrated male_penetrating male_penetrating_male not_furry nsfwshamecave oral panting papyrus_(underfell) papyrus_(underswap) papyrus_(undertale) penetration penis precum pseudo_incest_(lore) sans_(underswap) sex skeleton sweat tongue tongue_out undead underfell underswap undertale undertale_(series)

alien alien_humanoid alternate_universe animated_skeleton army_(steven_universe) black_sclera bone cartoon_network ckaitlyn clothed clothing crossover dancetale doc_(steven_universe) eyeball_(steven_universe) fully_clothed gans_(echotale) gem_(species) gloves group handwear humanoid inktale kerchief leggy_(steven_universe) mafiatale navy_(steven_universe) not_furry plant rock ruby_(gem_species) ruby_(steven_universe) sans_(mafiatale) sans_(underfell) sans_(underswap) sans_(undertale) signature skeleton snow star steven_universe sweater topwear tree undead underfell underswap undertale undertale_(series)

16:10 alternate_universe animated_skeleton blush bodily_fluids bone clothed clothed_sex clothing colored_cum cum cum_on_face cum_on_hand cum_on_tongue english_text genital_fluids glowing glowing_eyes group heart_symbol male male/male not_furry nsfwshamecave sans_(underfell) sans_(underlust) sans_(underswap) sans_(undertale) sex skeleton text tongue tongue_out undead underfell underlust underswap undertale undertale_(series) unusual_bodily_fluids unusual_cum unusual_genital_fluids widescreen

6:5 alternate_universe ambiguous_gender animated_skeleton band-aid bandage blue_eyes bone boots bottomwear brown_hair candy chara_(storyshift) chara_(undertale) child chocolate cigarette clothed clothing dessert ellipsis english_text family food food_in_mouth footwear fully_clothed gloves group hair handwear heart_symbol hoodie human humanoid kerchief male mammal not_furry open_mouth pants papyrus_(underswap) papyrus_(undertale) pattern_clothing pattern_topwear pose ryuo0917 sans_(underswap) sans_(undertale) shoes shoulder_pads sibling_(lore) signature simple_background size_difference skeleton smile smoke smoking sneakers sparkles star storyshift striped_clothing striped_topwear stripes sweater teeth text topwear undead underswap undertale undertale_(series) white_background yellow_eyes young

1:2 alternate_universe animated_skeleton blush bone clothing heart_symbol humanoid incest_(lore) kissing kissing_neck male not_furry nsfwshamecave papyrus_(underfell) papyrus_(underswap) papyrus_(undertale) question_mark sans_(underfell) sans_(underswap) sans_(undertale) skeleton surprised undead underfell underswap undertale undertale_(series)

alternate_universe animated_skeleton blush bone clothing comic dialogue english_text hi_res humanoid male not_furry outerswap outertale papyrus_(underswap) papyrus_(undertale) sans_(underswap) sans_(undertale) skeleton star_eyes text undead undertale undertale_(series) unknown_artist url

2017 alternate_universe animated_skeleton blush bone cigarette clothed clothed_sex clothing digital_drawing_(artwork) digital_media_(artwork) duo erection fellatio flat_colors genitals hi_res humanoid humanoid_genitalia humanoid_penis incest_(lore) male male/male not_furry oral orange_penis papyrus_(underswap) papyrus_(undertale) penile penis sans_(underswap) sans_(undertale) sex simple_background sindrawnup skeleton smoking tongue tongue_out undead underswap undertale undertale_(series) white_background

animated_skeleton bone boots clothed clothing footwear gloves handwear male mnstrcndy not_furry outerswap sans_(underswap) shoes simple_background skeleton smile solo undead undertale undertale_(series)

16:9 alternate_universe apode blush bone draconcopode drakoonlord glowing glowing_eyes humanoid legless male monster naga open_mouth oral_vore red_eyes reptile sans_(underfell) sans_(underswap) scalie serpentine sharp_teeth skeleton snake teeth tongue tongue_out underfell underswap undertale undertale_(series) vore widescreen

2015 absurd_res alphys alphys_(underswap) alternate_universe animated_skeleton anthro aquatic arachnid armor arthropod asgore_(underswap) asgore_dreemurr axe beard beverage black_hair black_sclera blue_body blue_eyes blue_fur blue_skin bone boss_monster_(undertale) bovid bow_(feature) bow_tie brother_(lore) brothers_(lore) brown_body brown_fur burger burgerpants burgerpants_(underswap) canid canine canis cape caprine cigarette clothing coat derp_eyes dessert domestic_cat domestic_dog doughnut elemental_creature evil_grin eyewear facial_hair fangs felid feline felis female fire fire_creature fish flora_fauna flower flowey_the_flower food fur gesture ghost glass glasses grey_body grey_hair grey_skin grillby grillby_(underswap) group hair hair_over_eye hand_gesture happstablook hat headgear headwear heart_eyes heart_symbol hi_res hoodie lab_coat lagomorph leporid long_ears machine male mammal melee_weapon mettaton muffet muffet_(underswap) multi_eye multi_limb musical_note musical_symbol napstablook nicecream_man one_eye_obstructed overweight papyrus_(underswap) papyrus_(undertale) pastry pie plant plant_pot popcornpr1nce purple_eyes rabbit red_hair robot role_reversal sans_(underswap) sans_(undertale) scales scalie scar scarf sharp_teeth sibling_(lore) skeleton smile smoke sparkles spider spirit staff suit suspenders symbol tea teapot teeth tem temmie_(underswap) temmie_(undertale) text text_on_clothing text_on_hat text_on_headgear text_on_headwear tongue tongue_out topwear toriel toriel_(underswap) undead underswap undertale undertale_(series) undyne undyne_(underswap) v_sign weapon white_body white_fur yellow_body yellow_scales

2016 alternate_universe animal_humanoid animated_skeleton anthro blue_boots blue_bottomwear blue_clothing blue_eyes blue_footwear blue_pants blush bodily_fluids bone boots bottomwear cat_humanoid clothed clothing digital_drawing_(artwork) digital_media_(artwork) disembodied_hand duo eyes_closed felid felid_humanoid feline feline_humanoid fish_hooking fluffy fluffy_tail footwear fur grey_background hand_in_mouth happy hi_res holding_tail humanoid inner_ear_fluff kerchief looking_at_viewer male mammal mammal_humanoid multiple_poses neckerchief neckwear nervous open_mouth pants pose saliva sans_(underswap) sans_(undertale) shirt shoes simple_background sinfulvoid skeleton smile solo_focus standing star_eyes surprised sweat tail teeth tongue tongue_out toony topwear tuft undead underswap undertale undertale_(series) white_body white_clothing white_fur white_shirt white_topwear

6:5 alternate_universe animated_skeleton blush bone brother_(lore) brothers_(lore) clothing duo english_text evilbeetle eyes_closed heart_symbol hi_res humanoid incest_(lore) kissing male male/male not_furry papyrus_(underswap) papyrus_(undertale) sans_(underswap) sans_(undertale) sibling_(lore) simple_background skeleton smile text undead underswap undertale undertale_(series) white_background

absurd_res alternate_universe animated_skeleton bone cigarette clothing collar dialogue digital_media_(artwork) duo english_text food hi_res humanoid lasagna nearlydeadzed not_furry papyrus_(font) papyrus_(underfell) papyrus_(underswap) papyrus_(undertale) pasta ravioli sans_(underswap) sans_(undertale) skeleton smile smoking spaghetti taco text unavailable_at_source undead underfell underswap undertale undertale_(series)

1:1 alternate_universe animated_skeleton blush bone cigarette clothing duo english_text hi_res humanoid male not_furry outerswap outertale papyrus_(underswap) papyrus_(undertale) sans_(underswap) sans_(undertale) skeleton smoking star_eyes text undead underswap undertale undertale_(series) unknown_artist url

5:4 aftertale alternate_universe animated_skeleton blood blush bodily_fluids bone clothed clothing dialogue duo english_text geno_sans_(aftertale) glitch hi_res loverofpiggies not_furry sans_(underswap) skeleton text undead underswap undertale undertale_(series) wounded

5:4 aftertale alternate_universe animated_skeleton blood blush bodily_fluids bone clothed clothing dialogue duo english_text geno_sans_(aftertale) glitch hi_res loverofpiggies not_furry sans_(underswap) skeleton text undead underswap undertale undertale_(series) wounded

5:4 alternate_universe animated_skeleton blush bone clothed clothing dialogue english_text fan_character hershey's hershey's_kisses hi_res loverofpiggies not_furry sans_(underswap) skeleton solo text undead underswap undertale undertale_(series)

5:4 aftertale alternate_universe animated_skeleton blood blush bodily_fluids bone clothed clothing dialogue duo english_text geno_sans_(aftertale) glitch hi_res loverofpiggies male not_furry sans_(underswap) skeleton text undead underswap undertale undertale_(series) wounded

5:4 aftertale alternate_universe animated_skeleton blood bodily_fluids bone clothed clothing dialogue english_text geno_sans_(aftertale) glitch hi_res loverofpiggies not_furry sans_(underswap) skeleton text undead underswap undertale undertale_(series) wounded

1:1 alternate_universe animated_skeleton blue_penis bone genitals humanoid humanoid_genitalia humanoid_penis lizheru male not_furry penis sans_(underswap) sans_(undertale) skeleton solo undead underswap undertale undertale_(series)

1:1 alternate_universe animated_skeleton blue_penis bone brother_(lore) brothers_(lore) duo genitals humanoid incest_(lore) lizheru male male/male male_penetrated male_penetrating male_penetrating_male not_furry oral oral_penetration papyrus_(underswap) papyrus_(undertale) penetration penis sans_(underswap) sans_(undertale) sex sibling_(lore) skeleton undead underswap undertale undertale_(series)

1:1 alternate_universe animated_skeleton bone clothed clothing humanoid lizheru male not_furry sans_(underswap) skeleton solo text undead underswap undertale undertale_(series)

1:1 alternate_universe animated_skeleton blue_tongue bone duo english_text exclamation_point genitals humanoid humanoid_genitalia humanoid_penis lizheru male male/male not_furry penis red_penis sans_(underfell) sans_(underswap) skeleton text tongue undead underswap undertale undertale_(series)

1:1 alternate_universe anal anal_penetration animated_skeleton blue_penis blue_tongue bone genitals group group_sex humanoid lizheru male male/male male_penetrated male_penetrating male_penetrating_male not_furry penetration penis red_penis sans_(underfell) sans_(underswap) sans_(undertale) selfcest sex skeleton square_crossover tongue undead underfell undertale undertale_(series)

alternate_universe anal anal_penetration animated_skeleton biped bone brother_(lore) brothers_(lore) duo genitals humanoid humanoid_genitalia humanoid_penis incest_(lore) lizheru male male/male male_penetrated male_penetrating male_penetrating_male not_furry orange_penis papyrus_(undertale) penetration penis sans_(underswap) sans_(undertale) sex sibling_(lore) skeleton undead underswap undertale undertale_(series)