AUs Included!

I write fluffy headcanons and oneshots/imagines for Undertale and Undertale AU characters! REQUESTS ARE CURRENTLY OPEN!!! Also be sure to read the rules before requesting! Mod: Red

[undertale-fluffcanons]

Request rules

master list

I completely forgot to post this, but hey, better late than never. here’s the request rules for mobile users!

Everyone’s nicknames (mostly for me, but for you guys too)

Main blog: @plushyking

Character Limit: up to 2

Requests are currently open!

what I will write for:

-sfw/fluff

-S/O headcanons! (In case anyone didn’t know)

-Undertale AUs (even my own, if requested!)

What I will not write for:

-OC/CANON (if I write this for one person then everyone will request it)

-nsfw

-fontcest

-yanderes

-abuse of any kind

-self-harm

-suicide

-blood/gore

-kinks/fetishes

-Angst

ANYTHING THAT CAN BE TAKEN IN A N/S/F/W way, I will NOT write it!

-anything involving Co*id-19

-unfortunately I will not write about mental illnesses of any kind as I do not know anything about them and even though I could do research, I still could not write it/do it justice and I don’t want others getting mad at me for it

-gender bends, for they make me uncomfortable

-i am no longer writing for ships

Other rule stuff:

If you have something to say to me, whether it’s correcting me on something, PLEASE take it to my messages and NOT in the replies of my asks/posts

I write out requests in the order I receive them! Unless it’s a time sensitive request like Valentine’s Day, Halloween, etc.

[undertale-fluffcanons]

I really should update the icon

And the master list

[undertale-fluffcanons]

Forgot to mention it, but the inbox has been cleared! I am currently out of asks, so feel free to send in a request :D

[undertale-fluffcanons]

Can you do uf mettaton with an s/o that's a star to?? Thank you ❤️

This has been in my ask box for like 6 months, I am so sorry anon. Also, gonna call him Mettafell for the time being unless someone wants to suggest something else!

*You’re a star, just like Mettafell! Maybe not as popular, but fairly popular

*At first, he had thought you were after his fame/fans, but realized that’s not true. However, it took him too long to realize that, but he won’t admit this out loud

*you two will collaborate together more often than not!

*the first time you did a collab together, you could have sworn you could hear the entire underground screaming in excitement (which… you thought was odd considering how they act a lot of the time)

*Mettafell loves helping you pick out your outfits for your own show/whatever else you do

*anytime you two are out in public together, he makes sure he doesn’t lose sight of you, most likely because he’ll keep you close to him

*you don’t really mind it too much, it just shows how much he cares.

*anytime a fan or group makes fun of you or makes you feel bad/uncomfortable, you can bet that Mettafell will make sure they won’t bother you anymore, doesn’t matter who it is, no one messes with you and gets away with it

[undertale-fluffcanons]

OOooo wb!!! Hmm, maybe some HCs for some baking with Muffet?

Thank you, anon!! :D

*Muffet usually bakes by herself, since no one really offers to help, but she’s fine with that, since the spiders help out occasionally

*so when you offer to bake with her, she’s both surprised but happy to bake with you!

*she will have everything prepared before you even get there, as she likes to have everything out beforehand so she knows where everything is/doesn’t have to dig it out later when it’s needed

*if you need any assistance/have questions, feel free to ask Muffet!

*she’ll give you the instructions as she’s working on whatever step of the process

*but if she notices you struggling, she’ll stop and help you

*but once everything is done and ready, the two of you clean up and just chat away as you wait for the baked goods to be ready

*and once they’re ready and cooled, she’s watching you with anticipation to see if you like it. And she lights up when you tell her you liked it!

*and if you offer to bake with her again, she becomes ecstatic, and will look forward to baking with you again

[undertale-fluffcanons]

If you do ut and uf nabstablook, can I get his reaction to having a human friend who put together a monster kareoke band group and asked him if he wants to be the lead composer with his music.

Sorry i only did UT Napstablook as I didn’t notice you asked for both until I was already finished with the ask

You had come to him asking if he would like to be the lead composer of your karaoke group, as you have heard his music before and you enjoy it

Napstablook was certainly surprised, and a bit flattered by your offer, but of course he’s unsure of it, as he’s not entirely sure of the idea.

“You… really want me to be the composer..?” He would ask you, and you nodded in agreement. You definitely wanted him to join your karaoke group.

“Of course I do! It’ll be fun!” You had told him, and that if he didn’t like it, then he didn’t have to come back for another session, to which he eventually agreed.

[undertale-fluffcanons]

Can I get how Uf, and Ut, sans would react to their human crush who fell down the mountain wanting to stay down there with all the monsters and make a home in the underground because they say they prefer it to being on the surface because of how magical, beautiful, and different everything is. And even if the barrier is broken, they would still stay down in the underground.

Underfell Sans:

*Fell has to make sure you’re not joking, because there is no way you just said that

*when you confirm that you were not joking, that you would rather stay underground, he is absolutely shocked

*”Why.. would you want to stay here of all places??” He would ask you

*when you give him your reason, he just stares at you silently for a few moments

*”*well i mean… i can’t stop ya.”

*and you are true to your word, you don’t leave the underground, even after the barrier is broken

*and Fell is surprisingly right by your side, which you weren’t expecting, as you expected him to head up to the surface with the others

*”*and leave ya here by yourself? yeah right.”

Undertale Sans:

*Sans isn’t really bothered by your words, but is a bit taken aback by it

*”*you would rather stay here? are you sure?”

*but he knows there’s no stopping you. he wants you to be happy, so if staying here makes you happy, then he’s all for it

*he’ll even stay with you, only because he loves you too much to leave you behind

*also because he’s a little curious to what you meant by everything being how beautiful it is and how magical it is in the underground

[undertale-fluffcanons]

4th!: Dream from what I've heard has a positive aura, due to being the guardian of said emotions, and in turn Nightmare has a negative one. What if that aura grew to be a bit too much and becomes overwhelming? He might need to go to the reader for comfort/help...

*Nightmare will never admit that his negative aura can become overwhelming, especially not to those he’s not close to

*however, there is one person that he can rely on, and that’s you. You are the only person who is aware of how overwhelming his aura can become

*so anytime this happens, you are the first person he will come to for help/comfort. You will keep him close and won’t let him go until you are sure he’s calmed down and that his aura is back to the way it should be

*the first time this had happened had caught you off guard. You were aware of his negative aura, but you didn’t think it would get to this extent

*so now you’ll keep him close, hug him/cuddle with him, whatever else may come to mind, until he calms down

*Nightmare will never admit this outright, but he does appreciate your help

[undertale-fluffcanons]

Third one: A short fluff story where it's winter, and the power goes out. Because of how cold it gets, you have to snuggle up to Cross to become warm.

*The power had gone out and it's the middle of winter, which is certainly not a good thing, especially for you

*You look over at Cross, who was unbothered by the sudden chill. You take a moment to debate whether you should snuggle up to him or not, since you're not sure if he would be okay with it or not

*...Cross notices you staring at him though before you can make a decision. Seeing as you don't have much else of a choice, you scoot a little closer to him

*"What are you doing?" he asks as he notices you moving closer to him

*You tell him that since the power's out, it's gotten a lot colder in the house and you were very cold

*"so what you're saying is that you want to... cuddle with me?"

*You could only nod as you shivered from the cold. Seeing this, Cross sighed and held his arms out to you. "...get over here," and without a moment's hesitation, you moved over to him and hugged him, practically burying your face into his jacket

*Cross simply shook his head and held you close to him to help keep you warm until the electricity came back on

[undertale-fluffcanons]

Second one! Cross and Killer are(at least from my knowledge)canonically rivals, I believe? They're my two favorite Au's, but how would they act in a poly? The idea of them fighting over Y/n all the time is kinda funny...

*Cross and Killer absolutely fight over you, or rather, who gets your attention/affection

*You have had to stop them on more than one occasion, before they caused any problems

*you cannot spend more time with one over the other, or the other will get very jealous

*You try spending one on one time with both of them when possible, though

*Killer is more affectionate than Cross, but Cross is more protective of you

*of course neither would allow anything to ever happen to you, though

[undertale-fluffcanons]

an Ask for all the papyruses! (Papyri?)

(Basing this off of my own kitty :])

What is their reaction to their S/O having a cat thats very chill? You can play with her tail and ears and she does not care, just sits there slowly blinking at them. Play with her paws? She dont care, go ahead. She'll pull her paws away if shes done with it

Also said cat brings dead rodents to then in the middle of the night

Meowing loudly

Sometimes its weird animals like a lizard, or just a really fat pigeon

It was a bat one time (actually happened to me, still confused on how she caught that)

S/O got so used to it they dont give a damn anymore, just stands up and cleans it up and goes back to bed

woah, you need to calm down there anon! I only write for two at a time here! I'm only going to write for Swapfell Paps since it's been a while

*Ash is honestly surprised about how chill your cat is, and has quickly warmed up to her

*He can and will pick her up when he possible, especially when he's feeling down/upset

*However, what he was not expecting was the sudden nightly 'gifts' whilst meowing loudly at the door

*You, on the other hand, have gotten used to it at this point

*so you just clean it up and go back to bed, while Ash is just staring at this cat like "why are you like this???" while holding her in his arms

*Meanwhile, the cat is just purring loudly in his arms, as if proud of what she's done

[undertale-fluffcanons]

Hi, can you write dust and ink with a sick reader? Allergies have incapacitated me, this would help. (Yes, first time requesting accomplished!)

I am so sorry for the wait, my other hyperfixations caught up to me as well as college classes and work

Dust:

*When Dust found out you were sick, he was fairly worried, and was immediately by your side

*he cares a lot about you. Actually… you’re the only one he really cares about, and can be a little protective of you

*you tell him that he doesn’t need to worry that much, that you’ll be fine

*he still can’t help but worry, though

*so he practically became your personal nurse, bringing you anything you could possibly need to get better sooner than later

*while you did appreciate his help, you tried to help him get some rest as well, also he doesn’t get sick as well

Ink:

*When Ink found out you were sick, he was by your side fairly quickly

*he wanted to make sure you were okay! Asking many questions to ensure that it wasn’t anything serious

*you had to calm him down and explain that you were just sick, that you would be fine in a few days.

*Ink brought you anything you may need to help you feel better, also ensuring you get enough rest and such

*if you asked, he would give you space, but he would still be around if you needed anything from him

[undertale-fluffcanons]

Can you do underfresh and underfell sans react to their s/o's pet getting scared whenever they see him?

Underfresh Sans:

Fresh knows that he’s not the most friendly looking guy around, but to find out that your pet is afraid of him tells him something. He was honestly a little surprised, which he was not expecting. After the first few times, he’s gotten used to it, so it doesn’t really bother him

Underfell Sans:

Fell isn’t really bothered by the fact that your pet is afraid of him. He knows he can be a little scary, what, with the sharp teeth and all. He won’t bother with trying to get your pet to stop being afraid, since he doesn’t really see a point to it.

[undertale-fluffcanons]

Hii! Can i request Underfell papyrus and Undertale papyrus (my favourite two(chronically obsessed))

Okay well this is technically two requests but you can combine them i guess?? (My first ever ask chat omg)

How would they react if their S/O was just a straight up menace? I'm talking climbs onto them, trees, walls.

Willing to fight/spar with literally anything and anyone (will jump a goose without hesitation(undyne incarnated??))

And just...overall menace to society...and themselves

Also ofcourse to their beloved skeleton and continuously making bad puns for the sake of it

For the 2nd part how would they react if their S/O can teleport objects....but only if it has comedic timing and or they wanna fight someone

Someone yelled smth monsterphobic? The S/O has a metal bat now that they definitely didn't have at first!

(You can do both or either, idm :])

Hiii I’m only going to do one at a time cause that’s just,,, way too much for me to write at once

Underfell Papyrus:

*you can teleport objects, but only when it’s for comedic purposes

*…or if you want to fight someone

*while Fell is aware of your little… ability, he has no idea how it actually works

*like one minute you two are walking and talking, then next minute you have a metal bat just ready to beat someone up because you heard them say something mean about him/other monsters

*he has had to hold you back on several occasions

*while he would like to see you beat someone up, he doesn’t want you causing trouble

Undertale Papyrus:

*Papyrus has absolutely no idea how your little ability works, but he knows that it only really works for comedic purposes

*he’s asked you on more than one occasion, but not even you’re really sure how it works

*sometimes you summon things that are very funny to you and him

*other times… he’s had to hold you back from fighting someone because you heard them say something mean

*”PLEASE DO NOT FIGHT THEM Y/N, IT IS NOT WORTH IT!”

[undertale-fluffcanons]

Hi there! hope you're doing well, it's my birthday today and I was wondering if you could do a fluff of ink x reader where he celebrates with her please? Have a great day!

hiii sorry this took me a little bit to get to, I was at work when I received this ask! I hope these are okay!

*Ink already knew about your birthday without you even really telling him

*He had pieced it together on his own while you were out and about, and he knew he had to do something special for you!

*Ink is not the best with surprises, so he will outright ask you if there is anything specific for your birthday

*depending on how you answer, he'll react accordingly

*If you want a small party with friends, then he'll do just that! Or if you just want something that's just the two of you, then that's fine by him too!

*He just wants to make your day a special one

*Also he may or may not have planned his gifts ahead of time, waiting until your birthday to actually give them to you

[undertale-fluffcanons]

Hi 👋 I unfortunately have a severe fear of needles. Whenever I have to have blood work done, I start losing it, from crying to hyperventilating the list goes on forever 😓. So could I get how ut and us, sans would help or advice they would give their s/o to help them when they are scared.

I know that feeling, anon ;; just the mention of them gives me the chills. Was unsure whether to tag or not, but I did to be on the safe side! If I need to add other tags, please let me know!

Undertale Sans:

Sans will do his best to offer advice whenever you’re scared and he’s not around to help, by telling you to visualize your happy place, do whatever you can to relax,

However, if he’s around and he can help, he’ll hold your hand or hug you if he’s able to, and remind you to breathe. Sans will have you face him/away from whatever is making you scared, and will take the focus off of it by talking about something else to keep your mind off it until it’s over.

Underswap Sans:

Blue actually gives really good advice for when you’re scared and he’s not around to help. He tells you not to focus on whatever it is but thinking about something else, whether it’s him, or something else you like. Talk aloud to the person that’s in the room with you about whatever to keep your mind off it.

When he’s with you, however, your attention will be on him and him only. Don’t focus on the thing that’s scaring you, keep your eyes on him. And he’ll compliment you/telling you you’re doing great and that it’ll be over soon.

[undertale-fluffcanons]

Hi, can I request underfell sans and underell papyrus please?

I'm this, they have a partner (reader) and when it was their birthday, reader tries to surprise them with breakfast in bed. But, they find reader struggling to make eggs. Like I mean struggling. There's 4 diffrent pans in the sink, eggshells everywhere, they are coverd in egg yolk. Even though it's messy, very messy...reader is trying their best.

I hope these are alright! And I only did Underfell Sans since this was super specific, which I’m fine with, and I’m half asleep as I’m writing this, and I wrote more than I was expecting

*it was fairly simple to slip out of Fell’s room, as he’s quite the heavy sleeper. Even if you had woken him up, he would’ve went back to sleep

*today was slightly different in the fact that you were trying to surprise him for his birthday. You had managed to get him to tell you his birthday, which… was surprising to you, but you made sure to remember it.

*so you wanted to make him breakfast for his special day!

*Unfortunately for you, things were not working out for you and you were struggling

*you were covered in egg yolk, there were at least 4 different pans in the sink, and there were egg shells everywhere

*”Y/n? What the hell are ya doin’, sweetheart?” You heard a familiar voice call your name, making you flinch in response

*you slowly looked back at him, rubbing the back of your head as you explained what you had planned

*Fell was silent for a moment before he laughed, not expecting you to have done such a thing for him. He does appreciate that you would do this, though!

*”c’mon, get cleaned up and we’ll go have breakfast somewhere, okay?” You only nodded and got cleaned up before you two went for breakfast