ao3feed_undertale

Note: this is a successor blog for @ao3feed-undertale that hasn't been active since 2022 due to changes in the tumblr API (the old API isn't supported anymore and the owner of the blog isn't active to switch to the new API).

read it on AO3 at https://archiveofourown.org/works/88691601 by Batteryaciddrinker, S33ING_ST4RZZ Words: 435, Chapters: 1/1, Language: English Fandoms: Project Hail Mary (2026), Iron Lung (2026), Mouthwashing (Video Game), Batman: Under the Red Hood (2010), Undertale (Video Game), 逆転裁判 | Gyakuten Saiban | Ace Attorney, Rick and Morty, Wings of Fire - Tui T. Sutherland, Pocket Monsters: X & Y | Pokemon X & Y Versions, A Song of Ice and Fire - George R. R. Martin, Les Petits Meurtres d'Agatha Christie (TV), G.I. Joe - All Media Types, The Invisible Man - H. G. Wells, A Court of Thorns and Roses Series - Sarah J. Maas, Harry Potter - J. K. Rowling, Z-O-M-B-I-E-S (Disney Movies), The X-Files, Chronicles of Narnia - C. S. Lewis, Elder Scrolls V: Skyrim, Guns N' Roses Rating: Not Rated Warnings: Major Character Death Categories: Other Characters: Daisuke (Mouthwashing), The Convict | Simon (Iron Lung), Ryland Grace, Rocky (Project Hail Mary), Curly (Mouthwashing), Jimmy (Mouthwashing), Anya (Mouthwashing), Swansea (Mouthwashing), Yagami Light, L (Death Note), Matsuda Touta, Tenna (Deltarune), Mei Mei (Jujutsu Kaisen), Y/N (A Date with Markiplier), Rick Sanchez (Rick and Morty), Evil Morty (Rick and Morty), Getou Suguru, Gojo Satoru Relationships: The Convict | Simon (Iron Lung)/Ryland Grace Additional Tags: Plot What Plot/Porn Without Plot, Angst, Hurt No Comfort, Improper Use of Coat Guy's Stomach Hole (No I'm not a Human), Dick Grayson Needs a Hug, sonicfemslashweek25 (Sonic the Hedgehog), Mentioned J'onn J'onzz | Hank Henshaw, Fivesome - F/M/M/M/M, Movie: Z-O-M-B-I-E-S 4: Dawn of The Vampires (2025), Hurt Q (James Bond), Uyuu Restaurant (Genshin Impact), Jack-o'-lanterns, Book : L'Affaire Francis Blake | The Francis Blake Affair, Angst with a Happy Ending, Sharing a Bed, Bakugou Katsuki Swears A Lot, BakuDeku Secret Santa, Gojo Satoru is a Little Shit, Top Getou Suguru, Bottom Draco Malfoy, Bottom Will Smith (Hockey RPF b. 2005), Top Jimmy Donaldson | MrBeast, Mentioned M'gann M'orzz, P.I.X.A.L.-centric (Ninjago), Alternate Universe - The Outsiders (S. E. Hinton) Fusion, U.A. High School (My Hero Academia), John F. Kennedy Assassination, Trans Spamton G. Spamton, Trans Fiddleford H. McGucket, Episode: s05e01 Du grave à l'aigu (HPI), Bottom Geralt z Rivii | Geralt of Rivia, The X-Files Revival, c!Connor Week (Dream SMP), Bottom Kim Taehyung | V, Alpha Will Smith (Hockey RPF b. 2005), Cinnamon Roll N (Murder Drones) read it on AO3 at https://archiveofourown.org/works/88691601

read it on AO3 at https://archiveofourown.org/works/88687981 by alexandriachuckler lamictal and sleep deprivation has me acting WIIIILLLDDDD Words: 1930, Chapters: 1/1, Language: English Fandoms: Deltarune (Video Game), Undertale (Video Game), 龍が如く | Ryuu ga Gotoku | Yakuza (Video Games) Rating: Not Rated Warnings: Major Character Death Categories: F/F, F/M, M/M Characters: Spamton G. Spamton, Ramb (Deltarune), Tenna (Deltarune), Mine Yoshitaka, Tasque Manager, Jeremy Clarkson Relationships: Spamton G. Spamton/Tenna Additional Tags: 9/11, Brain Damage, Domestic Violence, Cuckquean, Prostitution, Tiananmen Square massacre, shitty author, Hypomania, Alcohol Overdose, Anal Sex read it on AO3 at https://archiveofourown.org/works/88687981

read it on AO3 at https://archiveofourown.org/works/88683686 by Velvet_Divine Cross was lost in a wave of pleasure, mind full of glorious fog as he watched his mates from his throne on Nightmare's lap. ~~~ Just smut with my favourite poly uwu Words: 1389, Chapters: 1/1, Language: English Fandoms: Undertale (Video Game) Rating: Explicit Warnings: Creator Chose Not To Use Archive Warnings, No Archive Warnings Apply Categories: M/M, Multi, Other Characters: Killer - Character, Dust, Horror - Character, Nightmare - Character, Cross Relationships: Sans/Sans (Undertale), Nightmare/Cross/Dust/Horror/Killer Additional Tags: Polyamorous Bad Sanses | Nightmare's Gang (Undertale), Bad Sanses | Nightmare's Gang (Undertale), Xtale Sans | Cross (Undertale), Something New Sans | Killer (Undertale), Dusttale Sans (Undertale), Horrortale Sans (Undertale), Dreamtale Nightmare Sans (Undertale), Communication, Safewords, Subspace, Orgy, Vaginal Sex, Cunnilingus, Oral Sex, Body Worship, Vaginal Fingering, Established Relationship, Bottom Xtale Sans | Cross (Undertale), BDSM Scene, Dom/sub Play, Light Dom/sub, Cock Warming, Tentacle Sex, tentacle warming, no tentacle warming tag u-u, Porn with Plot, Porn with Feelings, Vibrators, Grinding, Crying During Sex, Aftercare, Sleepy Cuddles, Anal Sex, Anal Fingering, Double Penetration, Double Penetration in Two Holes, Double Penetration in One Hole read it on AO3 at https://archiveofourown.org/works/88683686

read it on AO3 at https://archiveofourown.org/works/88669416 by Geno_909 Geno works a coffee shop part time at the airport where he meets the tall, dark and handsome and flight Captain who clearly has a crush on him. Its up to him to teach Reaper what it means to give in to his sadistic nature. Can Geno overlook their significant age gap and fall in love? Warning- contains smut! Words: 701, Chapters: 1/?, Language: English Fandoms: Undertale (Video Game) Rating: Explicit Warnings: Graphic Depictions Of Violence Categories: M/M Additional Tags: Alternate Universe - Human, Alternate Universe - Coffee Shops & Cafés, Age Difference, Aftertale Geno Sans (Undertale), Reapertale Sans (Undertale), Dreamtale Nightmare Sans (Undertale), Dreamtale Sans | Dream (Undertale), Dusttale Sans (Undertale), Xtale Sans | Cross (Undertale), Error Sans (Undertale), Something New Sans | Killer (Undertale), Othertale Sans | Color (Undertale), Horrortale Sans (Undertale), Epictale Sans (Undertale), Underswap Sans (Undertale), Underfell Sans (Undertale), Fluffytale Sans | Ccino (Undertale), Fresh Sans (Undertale), _____tale Sans | Ink (Undertale), Canon Sans | Classic Sans (Undertale), Canon Grillby (Undertale), Canon W.D.Gaster (Undertale), Scientist Sans (Undertale), Aftertale Geno Sans/Reapertale Sans (Undertale), Error Sans/Dreamtale Nightmare Sans (Undertale), Slow Romance, Slow Burn, Affectionate Insults, Voyeurism, Masochism, Sadism, Sadomasochism, Explicit Sexual Content, Kink Exploration, Praise Kink, Dominant Bottom, submissive top, Airports, airport sex, Mile High Club, Hate Sex, One Night Stands, Impact Play, Humiliation Kink, Pet Play, Sex Toys under Clothing, Improvised Sex Toys, Bloodplay, Bondage, Shibari, Spanking, Fear Play, Other Additional Tags to Be Added read it on AO3 at https://archiveofourown.org/works/88669416

read it on AO3 at https://archiveofourown.org/works/88630586 by DragonFruitHaj A foreign intelligence officer from the faraway planet of Capricorn crash lands his starship on a desolate rock. His distress signals are being jammed by something deep down below and dealing with it is the only way home. Now he must rely on his training both practical and mystical, whatever he can scrounge up, and whoever he can call upon for help to survive the treacherous journey down. Good company makes any journey easier, and this is no exception. Doesn't actually involve Undertale storylines, other than that falling down a dark hole and injuring oneself happens at some point. Capricorn, instead, is a set of original characters and worldbuilding adapted from the magic system of Undertale and originally meant to be a story for that universe. That story, interestingly, was about 70% complete at the time this one was posted, but I just had to pluck the unluckiest one of them and work out how their relatively exotic physiology would fare in this universe. Words: 22464, Chapters: 10/10, Language: English Fandoms: Casualties Unknown (Video Game), Undertale (Video Game) Rating: Mature Warnings: Graphic Depictions Of Violence Categories: Gen Characters: The Experiment (Casualties Unknown), Milky (Casualties Unknown), Original Characters, Original Non-Human Character(s) Additional Tags: Alternate Universe - Canon Divergence, Canon-Typical Violence, Trauma, Wound Care, improvised medicine, Magic, magical problem solving, Hurt/Comfort, not that this planet has much comfort to spare but they will sure try, Mental Anguish, Developing Friendships, Swearing, Furry, obviously, POV Third Person Limited, really what's a new friendship without swearing?, Minor Character Death read it on AO3 at https://archiveofourown.org/works/88630586

read it on AO3 at https://archiveofourown.org/works/88682676 by IloveOakMilk Mmmmm Sans Words: 0, Chapters: 4/?, Language: English Fandoms: Undertale (Video Game) Rating: Explicit Warnings: Creator Chose Not To Use Archive Warnings, No Archive Warnings Apply Categories: M/M Characters: Sans (Undertale) Relationships: Sans/Sans (Undertale) read it on AO3 at https://archiveofourown.org/works/88682676

read it on AO3 at https://archiveofourown.org/works/88682651 by Rayter_Raythewriter Once upon a time, spoke in shadowed rhyme spoke a tale of LOVE, a tale of WAR a tale that comes from under, awakened by a child and its river Words: 1373, Chapters: 1/?, Language: English Fandoms: Undertale (Video Game), Deltarune (Video Game) Rating: Teen And Up Audiences Warnings: Graphic Depictions Of Violence Categories: Other Characters: Ralsei (Deltarune), Kris (Deltarune), Frisk (Undertale) Relationships: Kris/Ralsei (Deltarune) Additional Tags: Asriel Dreemurr and Ralsei (Deltarune) are Different People, Trans Ralsei (Deltarune), Nonbinary Kris (Deltarune), They/Them Pronouns for Kris (Deltarune), Verbal Kris (Deltarune), AFAB Kris (Deltarune), Nonbinary Frisk (Undertale), Nonbinary Chara & Frisk (Undertale), Asriel Dreemurr and Chara are Siblings (Undertale), Nonbinary Chara (Undertale), They/Them Pronouns for Chara and Frisk (Undertale) read it on AO3 at https://archiveofourown.org/works/88682651

read it on AO3 at https://archiveofourown.org/works/88679786 by Naryhey Dust has always been by your side, ever since he was chosen as your knight, he's never left you alone, even now, when you're drowning in hatred and grief, he will still stay by your side, no matter what Words: 565, Chapters: 1/?, Language: English Fandoms: Undertale (Video Game) Rating: Not Rated Warnings: Creator Chose Not To Use Archive Warnings Categories: F/M Characters: Dust Sans, Reader Relationships: Dust sans/Reader Additional Tags: Dusttale Sans (Undertale), Reader-Insert, reader is an angel, reader is a princess, Dust is her knight, Royalty AU, Kinda, Demons and angels live in kingdoms, not heaven or hell, Reader is too lost in hatred, But dust doesn't care, He's loyal as fuck fr read it on AO3 at https://archiveofourown.org/works/88679786

read it on AO3 at https://archiveofourown.org/works/88676756 by Anonymous *The setting is a few centuries after the main timeline of Dreamswap, Dream killed Nightmare and got time traveled back to the time when Nightmare was still alive. Words: 10028, Chapters: 3/3, Language: English Series: Part 4 of Sweammare 18+ Collection Fandoms: Undertale (Video Game), Undertale, dreamswap - Fandom Rating: Explicit Warnings: Creator Chose Not To Use Archive Warnings, No Archive Warnings Apply Categories: M/M Characters: DreamSwap!Dream, Dreamswap!Nightmare, Corrupted!Dreamswap!Nightmare Relationships: Dreamswap!Dream/Dreamswap!Nightmare, sweammare Additional Tags: Sibling Incest, Love, NSFW, Headacanon, Edging, Barebacking, Creampie, Breeding, Deepthroat, Dominant, Submission, Light BDSM, Gentle Sex, Rough Sex, Size Difference, Orgasm Denial, spread anus read it on AO3 at https://archiveofourown.org/works/88676756

read it on AO3 at https://archiveofourown.org/works/88661661 by paganmoon My First fanfic!!! Note that my First language isn't english :( This was actually originally written as a trial for ANY type of writing as i don't write lol. Hope the writing isn't too bad bacause i'm actually quite proud with how It came out! :D Words: 2537, Chapters: 3/?, Language: English Fandoms: Undertale (Video Game) Rating: Mature Warnings: No Archive Warnings Apply Categories: M/M Characters: Sans (Undertale), Toriel (Undertale) Relationships: Sans/Sans (Undertale), Sans/Toriel (Undertale) Additional Tags: Aftertale Geno Sans/Reapertale Sans (Undertale), Aftertale Geno Sans (Undertale), Reapertale Sans (Undertale), Horrortale Sans (Undertale), Alternate Universe - Reapertale (Undertale), Reapertale Toriel (Undertale), Power Dynamics, Possessive Behavior, Soul Bond, Soul Sex, Soulmates, Hypnotism, Bad Poetry, Erotic Horror, Choking Kink, Wing Grooming, Sexual Overstimulation, Mildly Dubious Consent, Consensual but Not Safe or Sane, Strangers to Lovers, Opposites Attract, Angst and Hurt/Comfort, I'm Bad at Tagging, The Author Regrets Nothing, Author Is Sleep Deprived, My First AO3 Post, My First Fanfic, Past Relationship(s), Porn with Plot, Humiliation Kink, Name-Calling read it on AO3 at https://archiveofourown.org/works/88661661

read it on AO3 at https://archiveofourown.org/works/88655801 by noodlinstan When Kris and Susie wake up from an adventure, they find that Frisk is missing and shivering under the covers. Although Kris is a human themselves, they have had zero experience taking care of a human—much less a sick one. Words: 3372, Chapters: 1/1, Language: English Fandoms: Undertale (Video Game), Deltarune (Video Game) Rating: General Audiences Warnings: No Archive Warnings Apply Categories: Gen Characters: Kris (Deltarune), Susie (Deltarune), Frisk (Undertale) Relationships: Kris & Susie (Deltarune), Frisk (Undertale) & Kris (Deltarune), Kris & Susie (Deltarune) & Frisk (Undertale) Additional Tags: Whump, Sickfic, Sick Character, Fluff, Domestic Fluff, Platonic Cuddling, They/Them Pronouns for Kris (Deltarune), Gender-Neutral Frisk (Undertale), Kris and Susie are Best Friends (Deltarune), Susie is Trying Their Best (Deltarune), Kris is Trying Their Best (Deltarune), Frisk (Undertale) Needs a Hug, Oneshot read it on AO3 at https://archiveofourown.org/works/88655801

read it on AO3 at https://archiveofourown.org/works/88655781 by Anonymous What if Kris is frisk grandparent and they were in the war and that's why frisk has determination or something Or I see too many people write about undertale humans having genders dispite every human mentioned having they/them pronouns so I wanted to get my thoughts out. Words: 1087, Chapters: 1/1, Language: English Fandoms: Deltarune (Video Game), Undertale (Video Game) Rating: General Audiences Warnings: Major Character Death, No Archive Warnings Apply Categories: Other Characters: Susie (Deltarune), Kris (Deltarune), Frisk (Undertale) Relationships: Kris/Susie (Deltarune), Kris & Susie (Deltarune), Frisk & Frisk's Parents (Undertale) Additional Tags: Out of Character, Abusive Parents, Doomed Relationship, Not Beta Read, Nonbinary Frisk (Undertale), Nonbinary Kris (Deltarune), Undertale Alternate Universes, Spoilers - Undertale Pacifist Route, My First Fanfic read it on AO3 at https://archiveofourown.org/works/88655781

read it on AO3 at https://archiveofourown.org/works/88648946 by Alphabetfridge A (hopefully) growing collection of works based off of the Momma CQ comics by AlainaPraina. Geno, Fresh, and Error all belong to CrayonQueen. Words: 1842, Chapters: 1/?, Language: English Fandoms: Undertale AU - Fandom, Momma CQ - Fandom, UTAU Rating: General Audiences Warnings: Creator Chose Not To Use Archive Warnings Characters: Geno sans, Fresh Sans, Error Sans, Momma CQ (Undertale - Momma CQ by AlainaPraina) Additional Tags: Family, Sibling bickering, Disability, So much bickering will be here, Siblings read it on AO3 at https://archiveofourown.org/works/88648946

read it on AO3 at https://archiveofourown.org/works/88647956 by Morvun * Cross x Dt Nightmare * 我流非典型性crnm，Cross绝对中心向，会有大量与其他人互动 * 里社会pa，拟人 Cross最终选择了Nightmare的if线 Words: 11750, Chapters: 2/6, Language: 中文-普通话 國語 Fandoms: Undertale (Video Game) Rating: Explicit Warnings: No Archive Warnings Apply Categories: M/M Characters: Nightmare Sans, Cross sans, Dream Sans, Epic Sans, Killer Sans - Character Relationships: Crossmare, crnm Additional Tags: ままままち産裏社会パロ, 非典型性关系 read it on AO3 at https://archiveofourown.org/works/88647956

read it on AO3 at https://archiveofourown.org/works/88644556 by batprince1273 Papyrus decides the royal guard position might not be worth it anymore, but succumbs to boredom quickly. However, he eventually lands on the idea of trying to get a job at Grillby's. Words: 1268, Chapters: 1/1, Language: English Fandoms: Undertale (Video Game) Rating: General Audiences Warnings: No Archive Warnings Apply Categories: Gen Characters: Papyrus (Undertale), Grillby (Undertale), Sans (Undertale), Frisk (Undertale) Relationships: No Romantic Relationship(s) Additional Tags: Papyrus (Undertale)-centric, sfw, Light-Hearted, Multiple Authors, Nonbinary Frisk (Undertale), Reader Is Not Frisk (Undertale), Not Canon Compliant, Papyrus Has Implied Autism Kinda, Grillby Also Has Implied Autism Kinda Too, Everyone In This Fic Is Kinda Implied to be Autistic In General Actually?, writer's first fic read it on AO3 at https://archiveofourown.org/works/88644556

read it on AO3 at https://archiveofourown.org/works/88642906 by GlitchBunny Sans and his brother had finally moved into a new home in a new quite little town, in the middle of moving in Sans discovers an odd looking machine. Bored out of his mind he decided to put his degree to use and fix it up! In doing so he meets an odd pen pal of sorts across time and space! Making his stay here in Snowdin much more interesting... But what happens when this new friend slowly discovers the truth about San's unfortunate future and Sans discovers his unfortunate past? Will they be able to help and save each other or will time...Or a tiny little flower, get in the way? Words: 5051, Chapters: 1/?, Language: English Fandoms: Undertale (Video Game), Deltarune (Video Game) Rating: Teen And Up Audiences Warnings: Creator Chose Not To Use Archive Warnings Categories: Gen, Multi Characters: Sans (Undertale), Papyrus (Undertale), W. D. Gaster, Gaster Follower(s) (Undertale), Any and All Undertale characters have a chance of being used, And any Deltarune characters will probably only be mentioned Relationships: All Platonic (As of Now), No sibling or underaged shiping. Additional Tags: Time Travel, Time Travel fix/break, Bad Spelling & Grammar, -probably, Undertale genocide type of violence, Flowey violence, Badly written science (I am not a scientist), -but I tried, Random Updating (you have been warned...), Chat fic? Sort of? not really? (there's a lot of plot other than just typing to each other...), Psychological Horror read it on AO3 at https://archiveofourown.org/works/88642906