1 - 20 of 433 Works in Adult Frisk (Undertale)
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Summary
Frisk lights up as they slip through the door.
“You- You came!”
Chara sighs, and shuffles over to slam the pretty-people-discount coupon on the counter. What a stupid little slip of paper. But, a discount is a discount, and 75% off is a downright steal with how much people tended up mark up flowers around this time of year.
“Just something to say ‘I miss you’ for Heir’s Return tomorrow.” They mutter.
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fluffy charisk bullshit tattoo artist x florist au! with a little angst to taste, and chara and frisk being foils, because what’s more romantic then being each other’s foil characters?
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Frisk had a plan for everything. A plan for their education. A plan for their career. A plan for the next thirty years of their life, and exactly how they were going to free monsterkind from humanity.
But Frisk didn’t have a plan for this.
What is there to do when your body is dying and you can’t time-travel your way out? What can you do when the secrets you hide slip out of your control, ready to destroy the life you built? Frisk didn't know, so they do the thing they know how to do best—run away.
It's never too late to change. It's never too late to be better.
Will Frisk remember who they are, and love themselves again? Or will they let hatred consume them?
One thing is for certain. Their friends wont let them throw their life away. No matter how hard it becomes or how painful the journey is.
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Frisk and Chara both find newfound LOVE in each others brace - one born into abuse, the other form loneliness.
But how far can that LOVE be pushed? As their journey progresses, and more LOVE is gained, the boundaries of sex goes further beyond…
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The Best Promise - A Frisk/Sans Story by idolR21
Fandoms: Undertale (Video Game), Undertale
21 Nov 2025
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Sans never cared for anything except Papyrus and science. When he meets Frisk, the seventh human to fall underground, he begins to shed his aloof mask and realizes how much Frisk has to teach him about hope and love.
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Or: The one where an adult Frisk wakes up after their funeral, back at the beginning of everything. Of course, they know how to navigate all their adventures underground, but... Does anyone want to tell them what kind of sin they committed? After waking up each time, in different timelines, some of which they even know they generated, and others that they themselves didn't commit? Yeah, this isn't going to happen (it happens anyway).
Series
- Part 3 of Random Writing
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Asriel, along with his college roommate, Chara, want to get some extra credit with some volunteer hours! They gain some work at the high school back in Asriel's old town. But while there, they find an entrance to a mysterious dark world.
Series
- Part 1 of Chararune
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Frisk Starling should've been used to cases like these. After all, it was her duty to investigate. Give the victims their voice back, catch the sick freak who did it and give the broken families the justice she couldn’t have for herself.
That is until a string of murders throughout the county begin to appear. Women used like toys, mutilated and disposed of for the cops and journalists to find with only the tiniest slivers of useless evidence and the glaring fact that all the women...
Every…
Single…
One…
Look almost exactly like her… Frisk begins to wonder if maybe… the monster she's hunting down has turned her into the hunted.
And God, does she make the most exhilarating, delicious prey yet…
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The monster she fell in love with, had paid her to have sex with someone else. How cruel was that?
Frisk was a petty thief with nimble fingers and a charming smile. Before it all started, she had been on her own, and it was enough to survive. Stealing was easier when your charm had their guard down.
Then she met Sans, and suddenly she found the hope to live. Like a puppet on a string, he’d gotten her along to participate in his crew’s heist, despite being the only human on the team. He insisted on training her flirting skill and even resorted to kissing her whenever they had to teleport. He was enough to make her heart flutter dangerously, and she had to constantly remind herself that it was never going happen between them.
So why did he suddenly change his mind the morning before the heist? Why did he no longer want her to do the very thing he had recruited her to do?
Just as she found out, it all came crumbling down on her. -
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The sounds of soft knocks took their attention away from the screen. They stared at the door, bewildered. Who was awake at this time of hour? They waited until another series of knocks to confirm someone was there.
There were two guesses. One was their roommate, but that was immediately crossed out since they had a key to their room plus they were still out of town. Second, was the RA but they were positive they were asleep at this hour.
Hmm… Perhaps a small distraction could clear their mind.
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It's been 10 years since you've started anew. And now... it's time for you to start another new.
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Frisk, suffering issues being an ambassador for monsters, fucks with Chara in order to get away from these problems.
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Ink-stained threads by Shorixarts
Fandoms: Undertale (Video Game), Underfell - Fandom, underfell frans
04 Sep 2025
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“Sweet or serial killer? Guess I will find out real soon…..”
Sans Gaster - full time tattoo artist. Very quiet, reserved and has no other interest besides his brother, rock music and making sure his studio is thriving.
Sans is focused, but his focus has shifted when he met a woman who brings out a side of him, he didn`t know existedFrisk Solis full time fashion student and occasional creative assistant, very curious and bored with her routine. Frisk is always seeking new thrill, and sometimes that means fresh ink on her skin.
So, what happens when her little obsession leads her to a very particular tattoo artist?
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The story of the human and monster war, now days just another bedtime story, but that is for the humans. Monsters live trapped underground, they have gone through famines, epidemics, lost of hopes and dreams, and all because the humans were scared of them. Hope came back when finally, a "human" fell down. But it just brought more misfortune.
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You'll never be rid of me.
A detective Frisk finds themselves hunting down a rather elusive killer. They should have no leads to go off of, so why do they have the feeling they should know who it is?
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In a pit of debauchery, Frisk seeks out euphoria. Sans is what they find. This is the point of no return.
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My Choices Matter by Kass_slash2006
Fandoms: Deltarune (Video Game), Undertale (Video Game)
07 Aug 2025
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After countless times reliving the same few days and forced to make decisions that are not their own Kris is tired, Then when the entity that controls them decides to do a peaceful play of their life something new happens. A slip of control. The entity that once held power over their head like a puppet master is reduced to nothing more than a narrator. Kris knows this is their chance and that they must act fast but what can they do and who can they trust?
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After many many many resets including both pacifist and snowgrave routes, the player loses control of Kris on pacifist route when they open the dark fountain in the Dreemurr house. Kris now has a chance to prevent the player from gaining control, find out who is behind their possession, and maybe save a certain dark furred dear from their control too.This is my first fanfic so any constructive criticism is appreciated thanks :)
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Frisk, a human girl trapped in a dangerous underground black market operation run by the morally corrupt Sans. Forced into delivering black market goods for Sans while wearing a collar that tracks her, Frisk is torn between her growing curiosity and fear of him. Will their budding romance survive the harsh world of the underground? Will Sans turn her in to ASGORE to save his brother?
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After doing everything the right way in the first timeline, Frisk was compelled to do the genocide route for what they felt were "good" reasons. In doing so, they have broken utterly and become something new. Something absolutely devoted to Sans, and not remotely sane. Now they are striving to fix everything and find their path forward. What the hell is Sans supposed to do now?
(This is not an erotica story - it's a drama / sort-of-romance that eventually gets really spicy)
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The Fake Princess Frisk Offline (Status: Updated May 28, 2025) by Serena Walken (SerenaWalken)
Fandoms: Undertale (Video Game)
28 May 2025
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Before World 36 signed off, a world was just beginning to sign on. Unallowed to leave to different timelines, a new Gaster has come back with the help of a desperate Sans as Frisk and Asriel create more torment in his life with their new human groupie, a boy named Kevin. Understanding that certain things still flow through, Gaster uses Undyne and mutiny to bring the monsters closer to winning the war against not the humans (no threat), but all monster kingdoms themselves. (World 10)
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UNDEREVENT 2025/The Final UNDEREVENT (alternative) by SplatoonMangaFan
Fandoms: Undertale (Video Game), Deltarune (Video Game), Undertale Yellow (Video Game)
24 May 2025
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An alternate take of UNDEREVENT 2025/The Final UNDEREVENT presentation (applications confirmed to open up around December 2025, and the UE Finale to release around December 2026).
I have no association towards UNDEREVENT Official, nor anything of Toby Fox's work.