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1:1 alternate_universe animated_skeleton bedroom blush bone comic dialogue english_text humanoid lizheru male monster not_furry sans_(undertale) skeleton solo text undead underswap undertale undertale_(series) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone clothing comic comicest dialogue english_text humanoid lizheru male monster not_furry sans_(undertale) scarf skeleton sniffing solo text undead underswap undertale undertale_(series) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone comic dialogue english_text humanoid lizheru male monster not_furry sans_(undertale) skeleton sniffing solo text undead underswap undertale undertale_(series) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone comic dialogue english_text eyes_closed heart_symbol incest_(lore) lizheru male monster not_furry papyrus_(undertale) sans_(undertale) sibling_(lore) skeleton sleeping text undead underswap undertale undertale_(series) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bodily_fluids bone brother_(lore) brothers_(lore) comic dialogue english_text eyes_closed heart_symbol hug incest_(lore) lizheru male male/male monster not_furry papyrus_(underswap) papyrus_(undertale) sans_(underswap) sans_(undertale) sibling_(lore) skeleton sleeping sweat text undead underswap undertale undertale_(series) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bodily_fluids bone brother_(lore) brothers_(lore) comic dialogue english_text eyes_closed heart_symbol hug incest_(lore) licking lizheru male male/male monster 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) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone brother_(lore) brothers_(lore) comic dialogue duo english_text erection genitals glowing glowing_genitalia glowing_penis humanoid_genitalia humanoid_penis incest_(lore) lizheru male male/male monster not_furry papyrus_(underswap) papyrus_(undertale) penis sans_(underswap) sans_(undertale) sibling_(lore) skeleton sleeping text undead underswap undertale undertale_(series) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone brother_(lore) brothers_(lore) comic dialogue 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 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) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone brother_(lore) brothers_(lore) comic dialogue duo english_text erection eyes_closed fellatio genitals glowing glowing_genitalia glowing_penis humanoid_genitalia humanoid_penis incest_(lore) lizheru male male/male monster not_furry oral papyrus_(underswap) papyrus_(undertale) penile penis rubbing sans_(underswap) sans_(undertale) sex sibling_(lore) skeleton sleeping sucking text undead underswap undertale undertale_(series) 1:1 alternate_universe animated_skeleton bedroom blue_eyes blush bone brother_(lore) brothers_(lore) comic dialogue 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 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 bodily_fluids bone brother_(lore) brothers_(lore) comic cum cum_in_mouth cum_inside dialogue 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 not_furry oral orgasm papyrus_(underswap) papyrus_(undertale) penile penis rubbing saliva sans_(underswap) sans_(undertale) sex sibling_(lore) skeleton sleeping sucking surprise 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_skeleton blood blue_background blush bodily_fluids bone brother_(lore) brothers_(lore) duo english_text eyes_closed frame_by_frame hip_sway lizheru loop male monster nosebleed not_furry papyrus_(undertale) sans_(undertale) sibling_(lore) simple_background skeleton smile star teeth text undead underswap undertale undertale_(series) wide_eyed 1:1 alternate_universe animated_skeleton bed blue_penis blush bone brother_(lore) brothers_(lore) comic dialogue duo ellipsis english_text erection exclamation_point eyes_closed furniture genitals glowing glowing_genitalia glowing_penis heart_symbol humanoid lizheru male masturbation not_furry orgasm papyrus_(undertale) penile penile_masturbation penis sans_(undertale) sibling_(lore) sitting skeleton text tongue undead underswap undertale undertale_(series) 1:1 alternate_universe animated_skeleton bed blue_eyes blue_penis blue_tongue blush bodily_fluids bone brother_(lore) brothers_(lore) caught comic dialogue duo ellipsis english_text erection exclamation_point eyes_closed furniture genitals glowing glowing_genitalia glowing_penis glowing_tongue heart_symbol humanoid humanoid_genitalia humanoid_penis lizheru male masturbation not_furry orgasm papyrus_(undertale) penile penile_masturbation penis question_mark sans_(undertale) sibling_(lore) sitting skeleton sweat text tongue undead underswap undertale undertale_(series) url 1:1 alternate_universe animated_skeleton bed blue_eyes blush bodily_fluids bone comic dialogue ellipsis english_text eyes_closed furniture humanoid incest_(lore) kissing lizheru male male/male not_furry papyrus_(undertale) question_mark sans_(undertale) sitting skeleton tears text undead underswap undertale undertale_(series) absurd_res alternate_universe altertale animated_skeleton anthro asgore_dreemurr black_background bodily_fluids bone boots boss_monster_(undertale) bovid bread broken_heart caprine clothed clothing comic english_text food footwear friisans fur furniture gloves hair handwear happy heart_symbol hi_res hoodie horn humor long_ears long_image male mammal papyrus_(undertale) pasta sans_(undertale) scarf simple_background skeleton skull smile spaghetti sweat table taco tall_image text topwear toriel toriel_(altertale) undead underswap undertale undertale_(series) white_background white_body white_fur 16:9 alternate_universe animated 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 aftertale alternate_universe angeltale animated_skeleton better_version_at_source blush bone clothed clothing feathered_wings feathers flowey_the_flower frisk_(undertale) geno_sans_(aftertale) glitch gold_(metal) gold_tooth group hi_res hoodie human jacket kissing male mammal not_furry outertale plant sans_(undertale) scarf sharp_teeth shy skeleton skull smile sweater teeth topwear undead underfell underswap undertale undertale_(series) vines wings wounded yaya0709 16:9 2016 alternate_universe animated_skeleton anterior_nasal_aperture bone chappietriggerhappy cigarette clothed clothing english_text gaster_blaster grin hoodie humanoid male not_furry papyrus_(undertale) skeleton skull smile smoking solo text topwear undead underswap undertale undertale_(series) widescreen alternate_universe animated_skeleton bone cigarette clothing falling fan_character footwear gaster_blaster glass grin hi_res hoodie korhiper not_furry papyrus_(undertale) sans_(undertale) shoes skeleton slippers smile smoke topwear undead underswap undertale undertale_(series) warm_colors alternate_universe animated_skeleton bone boots clothed clothing fan_character footwear humanoid looking_at_viewer male milsomes not_furry sans_(undertale) skeleton solo text undead underswap undertale undertale_(series) alternate_universe animated_skeleton bdsm bondage bone bound dominant dominant_male duo hi_res incest_(lore) male male/male not_furry papyrus_(underfell) razinoats sans_(underfell) skeleton submissive submissive_male undead underfell underswap undertale undertale_(series) 5:4 alternate_universe animated_skeleton better_version_at_source blush bone clothed clothing dialogue english_text fan_character loverofpiggies not_furry sans_(underswap) skeleton solo text undead underswap undertale undertale_(series) 5:4 aftertale alternate_universe animated_skeleton better_version_at_source blood blush bodily_fluids bone clothed clothing dialogue duo english_text geno_sans_(aftertale) glitch loverofpiggies not_furry sans_(underswap) skeleton text undead underswap undertale undertale_(series) wounded 5:4 aftertale alternate_universe animated_skeleton better_version_at_source blood bodily_fluids bone clothed clothing dialogue english_text geno_sans_(aftertale) glitch loverofpiggies not_furry sans_(underswap) skeleton text undead underswap undertale undertale_(series) wounded 5:4 aftertale alternate_universe animated_skeleton better_version_at_source blood bodily_fluids bone cigarette clothed clothing dialogue duo english_text geno_sans_(aftertale) glitch loverofpiggies not_furry papyrus_(underswap) skeleton text undead underswap undertale undertale_(series) wounded 5:4 aftertale alternate_universe animated_skeleton better_version_at_source blood blush bodily_fluids bone clothed clothing dialogue duo english_text geno_sans_(aftertale) glitch loverofpiggies not_furry sans_(underswap) skeleton text undead underswap undertale undertale_(series) wounded 5:4 aftertale alternate_universe animated_skeleton better_version_at_source blood blush bodily_fluids bone clothed clothing dialogue duo english_text geno_sans_(aftertale) glitch loverofpiggies not_furry sans_(underswap) skeleton text undead underswap undertale undertale_(series) wounded alternate_universe animated_skeleton bone fan_character group hi_res male papyrus_(underfell) papyrus_(underswap) papyrus_(undertale) razinoats skeleton tentacles trio undead underfell underswap undertale undertale_(series) alternate_universe avoid_posting clothing coat fan_character female fish g0966 gloves hair handwear lab_coat marine red_hair solo topwear underfell underswap undertale undertale_(series) undyne yellow_sclera 2016 alternate_universe anthro armor boss_monster_(undertale) bovid caprine clothed clothing crown english_text fan_character female fur headgear mammal mature_anthro mature_female melee_weapon polearm skellymor solo text toriel trident underswap undertale undertale_(series) weapon white_body white_fur 2016 alphys alternate_universe anthro big_breasts breasts cleavage clothed clothing female geeflakes lizard muscular muscular_anthro muscular_female non-mammal_breasts reptile scalie solo underswap undertale undertale_(series) alphys alternate_universe anthro bandage female lizard looking_at_viewer monochrome muscular muscular_anthro muscular_female reptile scalie scar siqlyprince solo thick_thighs underswap undertale undertale_(series) alphys alternate_universe anthro bandage fan_character female lizard monochrome muscular muscular_anthro muscular_female reptile scalie siqlyprince solo underswap undertale undertale_(series) alphys alternate_universe anthro bandage bikini blush clothing dakimakura dakimakura_design english_text eyewear fan_character female female/female glasses hair lizard looking_at_viewer mew_mew_(undertale) mew_mew_kissy_cutie muscular pink_hair reptile scalie scar siqlyprince solo swimwear text underswap undertale undertale_(series) 3:4 alternate_universe blue_body blue_skin breasts clothing coat eyewear fan_character female fish glasses hair hair_over_eye kyuko-chan lab_coat marine one_eye_obstructed red_hair solo topwear trash umbrella underswap undertale undertale_(series) undyne water yellow_eyes 1:1 alternate_species alternate_universe fan_character fangs hi_res monster multi_eye photoshop_temmie teeth temmie_(undertale) underswap undertale undertale_(series) alternate_species alternate_universe ambiguous_gender animated animated_text canid canine english_text fan_character fangs felid fur heart_symbol loop mammal monster multi_eye nightmare_fuel photoshop_temmie pixelated_heart short_playtime solo teeth temmie_(undertale) tentacles text underswap undertale undertale_(series) what what_has_science_done where_is_your_god_now white_body white_fur 1boy 1girl alternate_costume animal_print arthropod_girl bespectacled black_hair blush bow bowtie bug casual character_name commentary_request doughnut extra_arms extra_eyes fang food formal glasses height_difference hood hoodie monster_girl muffet pant_suit pants papyrus_(undertale) ponytail protected_link ryokutya1107 shoes short_hair shorts sitting skeleton smoking sneakers spider spider_girl spider_print stool striped_clothes striped_pants suit traditional_bowtie underswap undertale 2016 alligator alligatorid alphys alternate_universe animal_print anthro armor asriel_dreemurr axe black_hair blonde_hair blue_body blue_fur blue_skin blush bodily_fluids boss_monster_(undertale) bottomwear bottomwear_down bovid bracers bratty_(undertale) breastplate briefs broadsword burger burgerpants canid canine canis caprine cash_register catty_(undertale) cheetah_print child cigarette clothed clothing coat crocodilian dialogue dog_food dog_treat dogamy dogaressa doggo_(undertale) domestic_cat domestic_dog dragon electronics english_text eye_patch eyes_closed eyewear felid feline felis female fish food footwear fur gauntlets glasses gloves goat greaves green_body green_scales group hair handwear hat headgear headphones headwear helmet hi_res lab_coat lagomorph leporid machine male mammal marine melee_weapon mythological_creature mythological_scalie mythology napstablook nicecream_man overweight pants pants_down partially_clothed pauldron pet_food platemail purple_body purple_fur question_mark rabbit red_hair reptile rg01_(undertale) rg02_(undertale) robot sandals scales scalie shtarfish smile speech_bubble sweat sword tail text text_on_clothing text_on_hat text_on_headwear topwear underswap undertale undertale_(series) underwear undyne weapon white_body white_fur young 4:5 :3 alternate_universe ambiguous_gender backwards_baseball_cap backwards_hat baseball_cap blue_eyes blue_hair blush clothing duo electronics eyelashes fan_character gesture ghost hair hair_over_eye hand_gesture happstablook hat headgear headphones headwear heart_eyes heart_symbol humanoid machine male mettaton napstablook napstabot not_furry one_eye_obstructed pink_body pointing pointing_at_viewer robot simple_background smile spirit underswap undertale undertale_(series) yukiblue94 alternate_universe ambiguous_gender duo english_text eyelashes flower ghost happstablook hug mettaton napstablook not_furry pink_body plant smile spirit text underswap undertale undertale_(series) unknown_artist