1 - 20 of 145 Bookmarked Items in Underfell Undyne (Undertale)
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When you were ten years old, your parents sent you to stay with a relative of yours from Ebott. Their villa was situated up on the mountainside, and you loved to explore the forestry. One day the ground gave out and you fell Underground, and faced terrors beyond your imagination. You were missing for weeks.
After you managed to miraculously return to the surface, your parents were relieved - but deeply troubled by your 'delusional ramblings'. They were convinced you were 'crazy', and feared how that would reflect on their reputation. Your doctors advised sending you to an in-patient psychiatric facility, which is where you spent the next few years in intensive therapy and counseling.
15 years later, you're a young adult with a somewhat manageable grip on life. You keep your head down, attend the social events that are expected of you, and try to be as unnoticeable as possible. Your parents arranged a suitor for you, and you're to be wed within the next year.
That is, until, those monsters your parents and doctors tried to convince you weren't real suddenly crawled out from the Underground. And they're a lot different from what you remember.
[[Underfell!verse.]]
- Language:
- English
- Words:
- 402,017
- Chapters:
- 46/?
- Comments:
- 1,387
- Kudos:
- 1,012
- Bookmarks:
- 203
- Hits:
- 40,520
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How to Protect a Human from A Murderous Fish by Floofanflur
Fandoms: Undertale (Video Game)
26 Jan 2025
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Summary
STEP ONE: TELL A VERY CONVINCING LIE ABOUT THE HUMAN'S NON-EXISTENT PRESENCE.
STEP TWO: BE CAUGHT IN YOUR LIE AND PREPARE FOR YOUR IMMINENT DOOM.
STEP THREE: …LIE AGAIN?
STEP FOUR: WHAT THE- HOW DID THAT WORK?!Papyrus had a very thought out and well prepared plan for making sure Undyne didn't kill Frisk—until Undyne went off script and showed up at his house. That was okay, though. Papyrus was nothing if not great at thinking on his feet!
Series
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Bookmark Notes:
Fell Pap is a beautiful Monster and I will protect him with all my ability
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Summary
Red and Edge find a couple of skeleton children in the midst of smoke and destruction. Turns out, they have a lot more in common than they thought.
That doesn't make caring for them much easier, though.And who knew adopting a couple of kids would start such a large chain reaction?
A series of stories regarding Edge and Red in how they go about parenting Sans and Papyrus, and how this found family changes the world they live in.
There is hot chocolate and revolution.And this is actually developing a plot of some kind, which is exciting.
SERIES NAME PREVIOUSLY "One Step Back"- Words:
- 213,637
- Works:
- 14
- Bookmarks:
- 131
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With Monsters on the surface, the rumor of a war and revolution against the royals of Ebott spread across the nation. Somehow, you found yourself smack dab in the middle of it all. All you had wanted to do was find a job that supported you and your little siblings until you could reunite with the rest of your family.
Series
- Part 1 of Serve & Protect
- Part 5 of Papyrus/Reader Fics
- Part 10 of Undertales Across the Multiverse
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Two Steps To The Left, And a Long Fall by MimiIvory
Fandom: Bendy and the Ink Machine, Undertale (Video Game)
28 May 2024
Summary
My slightly alternate universes, but only those directly related to the Underground. Mostly bitter ones.
- Words:
- 106,948
- Works:
- 54
- Bookmarks:
- 35
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Summary
Frisk has reached the end of the road in their resets and the strain of their timeline finally gives way right before they can fight with Sans.
In a last minute feeling of regret, they try something unbelievable.
They relinquish their soul, and the next thing Sans knows he's laying in a bed of flowers, feeling like he was ripped apart atom by atom and then put back together again.
Also he has hair.
And skin.
And this new Underground he's ended up in isn't quite as friendly as he remembered. Great.
- Language:
- English
- Words:
- 88,670
- Chapters:
- 16/?
- Comments:
- 475
- Kudos:
- 1,028
- Bookmarks:
- 199
- Hits:
- 22,526
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Summary
You are suuuper obsessed with Galaxy and its thing, especially the universe! You spend over Years building a machine and another over years to make it perfect, night and day, even when you're sick, you still do the things you love.
You close your eyes and ears to the people who call you crazy, calling you mad, insulting your creation, Etc. Etc.
But who are they to stop you anyway??And dear god, after years of tears, blood, and mind... the MACHINE IS PERFECT! At least that was what you thought.
You get sucked by your own creation when you try to make coordination and testing on it, and now you're here.. with a skeleton.. oh my god
It's wonderful! YOUR MACHINE IS WORKING! HAH! You can't wait to slap the mouth that calls your creation useless by this INVENTION~
Well, after you successfully back to your own universe, survive on this world, well, you're gonna get help from the skeletons infront of you... right?
And then you can ask a few questions about this universe, hopefully he wants to answer them... he will... You're going to make sure he gonna help you, if it means begging.
Alright... here we go.
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New Ebbott Blues by CherryValiant for SevereBlizzardLady
Fandoms: Undertale (Video Game)
07 Sep 2023
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Summary
"Bronx?" he scoffed, a question, still kneeling. “Sweetheart, you fuckin’ insult me. Mistakin’ me for that little shithead.”
Gun still firmly at the center of his spine, he sighed and huffed and pushed himself up. He was broader than you originally thought: much, much broader, easily dwarfing you as he rose to his full height. He was at least a head taller, twice as wide, his heavy-set bones covered by a black, fur-lined hoodie over a dark crimson tank-top. The dismal light showed the various scratches along his marrow. He smiled: one sharp canine was glittering gold, the same color as the thin chain that scraped against his exposed collar bones.
You didn’t back down. For a second, neither of you moved: your gun trained at where you guessed his soul would be, his eyelights assessing you.
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Bookmark Notes:
Genuinely so fucking good, goddamn
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When the Soul Calls by shy_angel_21 (Shylee_Rambles)
Fandoms: Undertale (Video Game), Underfell - Fandom
14 Jul 2025
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Summary
Shylee watches her friends and soulmates, Sans and Papyrus, fall in love and eventually date her childhood friend, Mercy. The worst part is that they knew about the soulmate link with her, but they rejected it and demand her to do the same if she valves their friendship. She was heartbroken but agreed, believing their friendship was more important. Although she secretly hopes that it can still be more... But what would happen if she met two of her skeletal friends' cousins clad in black and red, and they offered her companionship?
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Bookmark Notes:
Ch. 7 Red and Edge just decided they are going to show Sans that they can treat Shaylee better than he ever could, exciting
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Bookmark Notes:
Shylee Sans and Papa are soulmates. Sans and Paps say they wanna be friends and Shylee agrees, only for Sans and Paps to start dating her childhood vest friend Mercy. Mercy is ignorant of the soulmate status of her friend and boyfriends. It's kinda tearing Shylee apart, but she wants her friend/s to be happy. Sans is being an ass about it though. Red and Edge are Shylee's friends now. They are catching feelings and enying it, Shylee's catching feelings and is confused about it. Sans is being controlling, L to that guy.
9/10- waiting for more :D
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Summary
The Void seemed to ripple around him, as if alive, and he shuddered at the feeling. A wispy cord of red magic appeared before him, leading off to the distance, and then he felt a tear appearing somewhere. Grumbling softly, Sans followed the trail, sporting a limp that he didn't pay attention to, since he couldn't feel the pain anyway. Once he reached the end of the cord, standing in front of the tear, he went through it without hesitation. If he was lucky, he'd end up at home or in Grillby's back room so he could just sleep the rest of the day away. He wasn't expecting his foot to hit empty air, but by the time his situation registered in his mind, he was already tumbling over the edge of a cliff on the side of a towering mountain.
!! New chapter imminent. Please hold. Chapters Edited: 10/10. !!
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What would've happened if... [POV: Papyrus] by Silent_Observer_of_time
Fandoms: Undertale, Undertale (Video Game)
29 Dec 2016
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Summary
AU scenario in Underfell Universe/Timeline where UF!Pap was abandoned and found by Undyne.
Glossary of the series of One-shots:1 = How Papyrus came to be before turning into a second-in-command officer of the Royal Guard.
2 = Papyrus juggling all the crap his superior adopted-sister Undyne throws at him.
3 = Sans and Papyrus becomes the 'best of buddies' (Just joking, Sans is becoming a part of Papyrus' lifestyle)
4 = King Papyrus Ending: Now, Papyrus and Sans are 'eternally' stuck together. (Hey! At least there is Flowey who Papyrus can talk to but the skeleton's in denial to their friendship...)*P.S. There will be something branching out to this so I can get my closure.
Series
- Part 1 of Spears and Bones
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Summary
Red extraña a su hermanito de hace años, todo chiquito todo tierno, le gustaría cuidarlo de nuevo; y aprovecha esos preciados momentos en los que su hermanito la pasa mal, para ayudarlo a sentirse mejor con unos "métodos" que encontró en internet.
-Yo gano y tu ganas, jefe; además.... para eso jugamos piedra papel o tijera- Red sonrió. -¿No cumplirás tu palabra?-
-..... Siempre eres un maldito genio, te odio por eso-
-Yo también te quiero mucho, hermano- Red le dio una sonrisa. -Esto lo hago por tu bien-
[La etiquetas se actualizarán conforme pasen los capítulos y se desarrolle la historia, jajan't :'3 ]
{PAUSA INDEFINIDA!!! No sé si continuar esto, igualmente ya me cambié de fandom principal, lo siento}
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Summary
You will take care of this child. Someone needs to. Children should be allowed to loiter around fights.
Or, How Undyne grew up.Series
- Part 38 of Two Steps To The Left, And a Long Fall
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Buy me and keep me (Underfell Sans x Reader) by SableSapphire
Fandoms: Undertale (Video Game)
04 Dec 2016
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Summary
You lived a pretty normal life. You worked, you ate, you slept, and you get kidnapped to be sold to a very... interesting crowd.
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Summary
Papyrus really needs cooking lessons. So Sans finds a chef to teach him.
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Bookmark Notes:
Wanna see if I can amass a collection of awesome x reader or x oc fics for every soul trait. Currently got Kindness, Integrity and now Perseverance. 3 outta 7 ain’t bad so far. I’m biased towards perseverance tho cause it’s my favorite, glad to see em get some rep lol
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Summary
Music booming as the lights flash and flicker, neon and colored dances around the area, as smoke and booze floats and swirls in the air. Smug laughs and whimpers along with pants and cries, gagging and wet noises paints the room with sin and lust.
I sit on my Master's lap, as he speaks with two monsters. Discussing a price of one of the girls, a dog monster walks in “Sir, you have a guest wanting to see you” my Master being the loud and Arrogant man he is shoos off the dog, but the dog stays, fear in his black eyes “sir…it’s important” he urges. My Master growls, body heating up. "leave" he growls
The monsters leave, a tall and wide monster walk in the room, body bowing under the arch of the door. Eyes widening as I stare at this Giant of a monster, much taller and bulker than my Master, Speaking of my Master. He straightens up, not noticeably but he does.
Bones, nothing but bone. He wears a black and red suit, gold rings covering his long skeleton fingers, a hat on top of his smooth skull. A cigar in his pointed and sharp teeth, a grin stretch wide as a gold tooth shines as a light passes over it.
"Damin, time tah pay up" voice baritone and rumbly as red smoke surrounds him, air heavy and tense.
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Bookmark Notes:
Chapter 10 (Waiting for updates) 👍
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Serve & Protect by FandomWorld9728
Fandom: Fellswap Gold - Fandom, Underfell - Fandom, Underswap - Fandom, Undertale (Video Game)
16 Aug 2025
- Words:
- 8,523
- Works:
- 3
- Bookmarks:
- 3
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Summary
The king has fallen.
In the devastation left in the human's wake, a new king is needed. Papyrus steps up to the challenge, assisted by his brother.
Sans is sworn to obey the crown, bound by the Delta Rune. Regardless of who wears it.
But when dark alternates show up and threaten war, Papyrus has to make the hardest decision of his life, and Sans finds out the chains that bind him might not be as secure as he'd like.
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Summary
A series about the Undertale Multiverse getting a little better
- Words:
- 28,130
- Works:
- 13
- Bookmarks:
- 10
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Bookmark Notes:
F: 6, 13 O: 13
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Reader Inserts by MrMiss
Fandom: Five Nights at Freddy's, Subnautica (Video Game), Undertale (Video Game)
09 Oct 2025
- Words:
- 310,913
- Works:
- 13
- Bookmarks:
- 39
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