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#yandere underfell
yanderes-galore · 3 months
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Underfell AU Sans romantic concept please?
Sure! I tried to keep him as close to canon as possible while also putting in some of my HCs. He's actually really fun to write :) I hope you like my take... sorry if you don't. There's a gap in the middle due to Tumblr's formatting.
Yandere! Underfell! Sans Concept
Pairing: Romantic/Platonic
Possible Trigger Warnings: Gender-Neutral Darling, Obsession, Violence, Overprotective behavior, Violence, Anxiety, I wanted to make him more possessive (I might in the future but I never thought of it until now), Denial, Kidnapping, Mentioned possible mind break/Murder, Isolation, Stalking, Some jealousy mentioned near the end, Some manipulation, Forced companion/relationship.
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I feel Fell! Sans has the possibility of being a terrifying yandere.
He's one of the strongest monsters in the AU and his powers tend to fluctuate due to his emotions.
He's also incredibly stressed all the time from what I've read.
Fell! Sans cares for his brother, they both care for each other actually.
They both want to portray themselves as cool to one another and others.
Fell! Sans is still lazy but also sarcastic.
I know Fell! Papyrus doesn't enjoy killing humans but does it for "sport" to help the guilt, he also does it due to being part of the Royal Guard to protect Sans from Asgore.
However I'm unsure how Sans feels about killing humans according to canon.
I'd assume he'd be indifferent but supports it as it's the law of the land and the job Papyrus is given.
Sans’ obsession was meant to be kept vague however I feel with a human it feels more natural to me?
Maybe you take the role of Frisk or simply aid them.
Either way I'm defaulting Darling to human.
Of course, naturally as the world goes, you end up having to defend yourself against Sans and Papyrus.
Primarily against Papyrus as Sans probably doesn't bother fighting.
Although… you can tell there's some strength there.
Due to what I've read, he radiates power due to his stress.
It's supposedly seen in his jacket at times.
So you have an idea that Sans could easily kill, but are thankful he just chooses not to.
Fell! Sans certainly has an obvious edge in appearance and personality. 
He's very sarcastic with you but in a way you can tell he means well when you befriend him and his brother.
In fact when he forms an attachment he may even show some anxiety about you meeting the other monsters.
You are aware of how easily you could just… die, right?
Even with a flower to guide you, he hopes you can defend yourself and not just talk things out.
Although he is thankful you managed to appeal to his brother enough to spare him.
He definitely tries to act calm in general, especially around you, although there's times he slips.
I imagine Fell! Sans fidgets due to… well… the sheer amount of stress he's under.
Really, who isn't in the Underground?
With Asgore in charge there's strict rules.
Rules that could easily end you as a human.
Sans tries to tell himself to not get attached to you.
He'd be in denial about his obsession.
It's all because he's scared to lose you.
Part of him wants to protect you, yet the other part suggests just letting you go.
The ideas he has tears him apart internally, which Papyrus can definitely tell.
Sans keeps fidgeting and his powers keep fluctuating when he thinks about how he can lose you.
Fanon tends to depict Sans as overly sadistic, while I agree he has aggressive tendencies like everyone in this AU, I don't think he's over the top.
I feel Fell! Sans is more like an anxious and stressed mess more than anything.
Which for him can make him volatile as his powers can be controlled, but are emotion based.
His pent up emotions no doubt drives his obsession.
While Papyrus protects Sans from Asgore, Sans feels like he has to protect you from not only Asgore… but everyone not him or his brother.
While you continue your journey, Sans isn't far behind.
He still has similar powers to his classic counterpart, which means teleportation.
Every area you enter, he's somewhere there.
I never mentioned this in the original draft but I do feel Sans would get possessive/jealous.
It's just not mentioned much in this concept since he's more consumed by anxiety than anything.
But in a way he does feel you two belong together, one way or another.
He would definitely murder, but he has to hold himself back due to his powers.
Which, yes, I assume would mean if he's jealous or enraged enough with you talking to others... his powers may flare.
Papyrus is against this but this human clearly means a lot to Sans.
Admittedly… Papyrus would miss you if you died too.
So he understands where Sans is coming from, it mirrors the care Papyrus has for Sans.
But Sans seems more… intense?
Sans could just feel something akin to close friendship or something more.
Honestly, if a monster nearly killed you, he'd probably snap and use his powers.
Which is why he prefers to just… stick around you everywhere.
Admittedly Sans likes it when you laugh.
He tries not to show it but you mean a lot to him.
The reason he tries to hide it as it shows vulnerability.
But you seem to enjoy his Knock Knock jokes and his company….
You like it because he's more “friendly” than the others.
Honestly, that gives him a bit of pride while also striking vulnerability in him.
Sans really keeps trying to tell himself his obsession is a vulnerability.
He shouldn't be this attached to you.
Yet now he really can't just let you go.
As a result I imagine he'd prevent you from meeting Asgore.
Sure, okay, you may have befriended most of the monsters here…
But not him…
Please not him…
He'll kill you and Sans will snap.
Scared of this he gets more fidgety.
You can probably tell even though he acts collected, he has an aura that scares you.
Sans doesn't know how to explain to you he cares about you.
He just doesn't want to lose you.
So Sans may try to manipulate you into staying with him more to avoid Asgore.
Isn't staying in Snowdin better?
Well… Papyrus may want to see you again!
Y'know… it's futile to go against Asgore, right?
Just… stay with him.
If he has to, he'll use some of his power to lock you away in his home/room.
Look, you don't get it.
Asgore nearly killed Sans before… he could and will do the same to you!
It's behind closed doors that Sans’ facade breaks.
He pulls you closer and mumbles about his fears.
He plans to keep you right here… if you try to leave, he'll know.
At this point he'll kill any monster who tries to hurt you or even goes near you.
Sans curses himself for getting so attached to a human.
However, he's given in now.
He'll keep you away from all the danger.
He'll keep you to himself.
Even if it requires others, including him, to get hurt due to his powers and rage.
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battlemaiden13 · 2 years
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WAIT WAIT WAIT, what about yandere House but the mc basically flashes the boys if they think they gonna be in trouble, like takes off their shirt to just get out of possibly getting hurt, using their body to soften them up
WARNING: Yandere, Blood, gore, toxic Relations, sexual references
Sans -It won’t work but he will comment on it. Honestly he applauds the effort but if he’s about to hurt you, you are gonna be hurt. It’s a punishment and to teach you not to do things, he will not be swayed. 
Papyrus -It’s a fifty fifty if it works. If he is super mad he’s like blind to everything but his goal but if he’s only slightly upset then sure it works. Depends what you did to get yourself in this mess in the first place. 
Red -Definitely works and will work every single time. Hell he might pretend to hit you just so you strip for him. It’s not healthy but now you don’t get hit as much. He does like leaving marks on you still. 
Edge -Doesn’t resort to physical violence at all but might hit you just for taking off your shirt. It’s indecent and to be far he wasn’t going to hit you in the first place he just was yelling. It does work though and he ends up just sighing in disappointment and leaving. 
Blue -It works but not how you intended. He literally starts laughing when he figures out what you are doing and lets you go because he’s amused. This trick will only work once though so use it wisely. 
Orange -I mean would never hurt you unless you knew his secret so enjoy the show. It doesn’t work if he is actually trying to kill you though if you know his secret it’s already too late. 
Berry -If he is the one hurting you he is too far gone to stop no matter what you do to distract or stop him it won’t work. You either need to be running or hiding right now not stripping. 
Syrup -Yeah his brain fully shuts down in a panic. He has no idea what to do and you get off scot free. This will lose effect after a while if you are constantly using it but if you space it out it works great. 
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confettibonez · 9 months
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Get a helmet damn
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raincheckrazz · 3 months
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Jealousy headcanons for fell sans, possibly?
Fell Sans Jealousy Headcanons!
Fell Sans X Reader
Thanks for the request! I was about halfway finished, but it deleted itself, so sorry if it seems a bit all over the place. Here goes!
♥️💀
Fell Sans
Fell Sans is quite jealous. He comes from the underground, where it's kill or be killed, and you protected what you had with your life. Perhaps part of him is still trapped there.
There is only one of you in the whole world, which makes you a hot commodity
Oh! And the fact that he may or may not love you...
Fell would totally throw hands, except he is a total simp doesn't want to make you angry. For some reason that he can't wrap his head around, you "enjoy your friend's company," or something.
If you're being flirted with, he may smile (bare his sharp teeth) at your friend (the interloper), and, well, if they get scared and leave, how is that his fault?
Master of the subtle threatening glower
If another Sans flirts with you, he wouldn't even say anything, he'd just casually pop him one when you aren't looking. Eventually the other Sans' slowly just stop interacting with you, wary of another fist in the eyesocket.
If his brother Papyrus flirts with you, it would result in back and forth insults between the two of them, which escalates until Sans comes and stays at your house for a while. (Neither of you mind so much ;)
After that, Sans does his best to keep you away from Papyrus
His use of pet names and PDA is dialed up to ten whenever he's feeling a bit jealous. He wants everyone to know that you're very much together, that you like his ugly mug the best. He's proud of that fact.
*casually carries you bridal style through walmart*
He could dial back his jealousy, but you guys might have to invest in a punching bag and a therapist
He should actually be in therapy tbh
Anyway, if you want him to chill, just flick him in the side of his skull and he'd snap out of it. There is a number of unpleasant things he'd rather do before losing you, and he'd do them in a heartbeat.
Jealousy level: 9/10
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alch3mic · 2 years
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the beast from my au wickedtale.
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chocolatte-and-despair · 10 months
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Hi. Can I have some hc of platonic yandere uf frisk with a human!monster friend (like a vampire, zombie or ghost)?
Underfell Frisk
Fawn hates monsters. She hates them so damn much that she had committed genocide over and over and over and over again. The only reason why she ever stopped was because Dessy begged her to. So when Fawn finally got to the surface and found out that there were filthy monsters up top too, she was out for blood.
She met you while on her usual monster hunt, killing whoever she found. But then, something made her stop when she saw you. You looked so human. She wouldn't have known you were a monster if she didn't notice your fangs. And for some reason, she felt drawn to you.
"Just a few minutes," she told herself, as she sat down to talk to you. "Just a few days," she told herself when you two exchanged numbers. "Just a few years." She repeated to herself when she started to feed you on her blood, so you could not eat anything else but her blood.
You reminded her of Dessy. Sweet, a bit naive and so very obedient. You were so damn perfect, she could forget you being a monster.
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unma · 3 months
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Why?
aka I finally finished my Yandere Frisk fic.
Rating: Mature
Ships: Yan!Frisk/Sans (previously mutual, now somewhat one-sided, though to what extent is up to your interpretation)
AU: Underfell
Content Warnings: Graphic Depictions of Violence, Main Character Death, A few Non-Con elements (it's minor and towards the end, and doesn't go past kissing)
Word Count: 10, 427
Summary:
What is love, if not sharing in pain?
Sans thought they'd gotten their happy ending, as perfect as things could be. They were still in the underground, sure, but he had his friends, and things were slowly getting better.
He'd made the rookie mistake of still having hope.
And now that everything he knew was gone, all he was left with was that pain, and a single lingering question.
(My comments here are going to be different from the fic's notes).
Woah, this is my first fic since tumblr fixed my blog. Make no mistake though, this fic is old. Really old. I've been working on it for at least three years old. There have been a lot of rewrites, but I couldn't give up on this. I love yanderes. I needed to see this through.
I do like the old versions, though, so I'll be posting the alternate versions I never finished. I'll need to add a bit more of what I was going to write, but those will likely remain as unedited as possible, because I wanna show how far I got before I decided it needed to be rewritten.
This fic definitely could've been revised more. Been rewritten more. But like. After 3 years? I think I've done enough to finally release this into the wild.
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TIMBER PINKS YAN AND FELL SANS PLEASE OMG
Of course!
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Timber: When his datemate proposes to him, he's not really sure what they're doing? Like, what the heck? They would have to explain to him what proposing means, and once they do, he accepts because he's very happy! He would like the ring, but he doesn't really wear it? He would just go to put it into his little secret area(it's the place where his forest is still not burnt and it's pretty there(I wrote about it before, I dunno if you know lol)
Pinks: Another one that doesn't get it at first. Oh, yeah, pretty ring! What's that mean? Once they explain it to him, he perks up then smiles and starts to explain how his kind get married. His rambling makes him almost forget that they're proposing... until he agrees, of course! He would pull them into the water and nuzzle their faces together, letting out happy hums. He is very happy that his mate wants to stay with him forever.
Yanberry: He would stare at the ring with wide sockets, his eyeshines disappearing. It might seem like he's upset, but then they come back and they're so bright! He hugs you, pressing 'kisses' against your cheeks. "Yes! Of course I'll marry you. Ahh, how did you get this without me noticing? You're so cute!" of course he would also try to figure out how you snuck out to buy the ring, but right now, he didn't care enough about it to question it! You're his marriage partner now, more than just his datemate... maybe he could even talk you into doing a soul binding?
Red: His first instinct would be to say no, then he realizes exactly what you're doing and quickly change his answer... then do it again. He's panicking until he asks. "Are you sure you want to marry me? I mean, fuck, that's a lot! I don't think I'd be all that good of a husband or whatever it's called." He rubs the side of his head, embarrassed. It's honestly pretty cute his reaction haha.
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Fandoms I'll Write For: LEGO MONKIE KID,My Next Life As A Villainess, Danganronpa, Undertale(ALL THE AU), Welcome home, Hazbin Hotel, Helluva Boss, Helluverse, FNAF, Harry Potter, Theorist (AKA MATPAT AND THE NEWS HOST FANDOM), Kaiju, The Monsterverse, Poppy Playtime, Witchcraft SMP, TADC, and maybe I will add more later.
I will probably be writing more of yandere(Both platonic and romantic) because I like some bittersweet:)
I will not write unless it's has good reason to: Mindbreak(Depends), Dumbification(Depends), Abortions, Necrophilia, Character Death (Depends), Bad Ending (Depends), Rape/noncon(Depends), I will add later.
I will make some AU, it's would probably be cringe but you know what, I don't care.
Feel free to send in a request or ask me a question!
And also:
Gender neutral, Male and Female Reader's are welcomed!
Please don't expect an perfect character personality when it's come to AU and fanfic/headcanon as I have often make AU that sometimes mess up with the character.
I will not involve real life illnesses like cancer, if its something made up like Hanahaki for example I'll allow it.
I have the right to deny a requests, Nothing out of spite or hatred but some subjects are uncomfortable for me.
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susartwork · 4 months
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What happens if you put three mentally unstable skeletons + their babysitter in the same room?
Exactly what is happening in the Roleplayed Timeline
@parniathedevil @ask-yandere-sci @another-underfellsans
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I can't escape undertale for 5 mcfuckin minutes dude :sob: /nm /lh
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Yandere Fell Pap. You know what to do, old friend...
MCPHUCKING SAME-I THOUGHT I WAS OVER NIGHTMARE SANS-I WAS CLEARLY MISTAKEN-)
B a s t a r d m a n . You can not change my mind./j
Prepare yourself because he can get quite aggressive when he doesn't get his way, but on the plus side if it wasn't your fault he won't touch you so at least there's that?
He knew he had to have you the moment he laid eyes on you. He fully believes that the two of you are soulmates. I mean why else would he feel such a strong attraction to you so quickly? There can't be a better explanation and even if someone does give him one he refuse to listen.
Fell paps is incredibly possessive. You're not to leave his side without his permission and he usually has his brother watch you when he can't. On the very rare occasion that you are left alone you are usually locked in his room.
Papyrus is very picky when it comes to who you talk with and if he sees you speaking with anyone that he views as competition he manipulate you into believing that they're just trying to trick you. Most of the time the only person you're allowed to talk to is Sans.
He really likes to carry you around. It's his version of both flirting and showing you that if you want to escape he's going to give you one hell of a hard time.
If you ever do try to escape he is furious. What the hell do you think you're doing trying to run away from him? Do you have a death wish because it's really seeming to look like it...
He shows absolutely no mercy when it comes to punishments no matter the circumstances. Once he decides to do something it doesn't matter how much you scream, cry, etc. It's your fault that you're in this situation anyways right? If you would have just listened to him like a good little pet that would have never happened.
After Papyrus is finished with whatever punishment he gave you he acts as though nothing had happened and will probably gaslight you into doing the same.
If you ever actually do manage to escape just know that he won't rest until he captures you. Once he gets his hands on you it's over. He's going to make your life as miserable as his was after you left him all alone.
If you're attempts to escape become too frequent he'll tie you to the bed and refuse to untie unless absolutely for a few weeks as a warning of what will happen if you keep it up.
He's contemplated taking you somewhere and hiding you where no one would be able to find you many times, but ultimately decided that he liked others knowing that you were his.
He regularly shows you off to the rest of the underground. That's right, (Y/N) belongs to him and only him. None of you pathetic creatures are worthy of his lover.
One and maybe the only good thing about him obsessing over you is that anyone who dares to do much as send a dirty look in your direction will have to answer to him. Anyone who may have hurt you in the past is totally phucked over as well.
I HAVE RETURNED FROM THE DEAD. DID YA MISS ME??)
Also sorry this took so damn long to get out-I finally got out of my writing block-)
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yanderes-galore · 3 months
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Screenshot this as I am not comfortable tagging OP! A bit OOC for my Fell! Sans but I'll do what I can! Here's a short argument scene (I was not given a plot again....)
Prompts Here
Yandere! UnderFell! Sans Prompts 2, 9, 12
"If you want me to beg, then I’ll beg for you."
"I will never let you leave me."
"I’m only this desperate for you."
Pairing: Romantic/Platonic
Possible Trigger Warnings: Gender-Neutral Darling, Obsession, Overprotective behavior, Isolation, Swearing, Kidnapping implied, Forced companionship.
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"What? Do you want me to grovel at your feet just to make sure you don't get yourself killed out there?" The skeleton hisses at you in an irritated tone. "I will never let you leave me."
"I can handle myself out there, you don't need to be around me all the time!" You hiss back, narrowing your eyes. The door out of Sans' room has been locked your entire argument. You just know he's using his powers to keep it that way.
"You don't fucking get it!" Sans scolds, keeping his ground. "You can't live out there without me. You'll die... why don't you see that!?"
"I'm going to be fine. You need to let me out." You reason, but Sans refuses to listen.
"Don't act like you're such a damn expert!" Sans spits. "If you want me to beg, then I’ll beg for you! You. Will. Die. End of story!"
You can tell by the flare of his coat that you're making him frustrated. You're wary of his mood and back down a bit. Sans notices and takes a deep breath.
"I’m only this desperate for you..." Sans sighs, looking weary. "Does that mean anything to you? Can't you tell I care about you? If you go out there... they'll kill you. They'll take you away.
You feel sympathetic towards the skeleton in front of you. You want to reach out but you're afraid.
Especially when you see the glint in his sockets.
"Which means I'm willing to do anything to keep you here with me..." Sans laughs, stepping closer. You feel bones at your back. A chill climbs up your spine like spiders.
"Including hurt you..." Sans whispers, placing a gloved hand on your cheek.
"So are you sure you want to press me anymore than you have?"
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battlemaiden13 · 9 months
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Question for yandere house squad! What if MC gets super paranoid of people coming into their room and watching her sleep, so they knock on the skeleton's door asking if they could spend the night with them?
Sans - He’s honestly a bit taken aback and surprised. He would never have expected you to come to his room of your own free will. He lets you in but immediately goes back to his computer. He's there all night, not on purpose Sans just often forgets he needs sleep. On the plus side you get his giant bed all to yourself. 
Papyrus - He lets you into his room without any issues. Papyrus is very polite and a great host, although he still says some things that make you uncomfortable, he offers you his bed and he stays on the couch in his room. Which is fine until you wake up in the morning to him smiling at you. You have no idea how long he was watching you sleep. 
Red - He freezes for a second before slamming his door shut both of you standing outside it. He suggests that both of you sleep in your room instead, his is a mess and stinks of blood. Of course he also says something highly perverted and will defiantly get a bit handsy but you went to him so you were prepared for that. Well you thought he’d get handsy, Red is actually very nervous that you came to him and he doesn’t end up doing anything but sleeping. 
Edge - Steps aside and lets you into his room. He offers you a tea that will help you sleep, mainly because of the mild poisons it has in it. He gets how unnerving living in this house must be for someone like you and is a good host. 
Blue -He’s blushing, obviously as he goes a bright blue and begins to stumble over his words. His eyelights have shifted into literal hearts and you aren’t sure if you’ve just made a huge mistake or not. He practically drags you into his room and promises you’ll be safe in here, although maybe don’t look too closer around. 
Orange -Of course he lets you into his room, he even sheepishly apologizes for the state of it. He offers you the bed although he really wants to sleep on it with you he does say he can take the couch. He has to keep up the act that he’s not crazy or the main culprit who was watching you sleep. He was shortcutting into your room but now you're here and he wants you to stay in his room every night. 
Berry -Brags about how of course you’d come to him for help. It almost seems like he will turn you away before he surprises you by letting you in. He does make you sleep on the floor, unless of course you make him back down from that by showing him exactly who's in charge. 
Syrup -He’s not completely awake when you ask so he just grabs your wrist and drags you into his bed. He doesn’t realize what happened until the morning when he unceremoniously pushed you out of his death grip. He is really embarrassed about what he did. 
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lizzie-tempest · 9 months
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Gilded Cage - Chapter 17: The Bad Ending
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lunnar-phantom2 · 2 years
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Fell frisk versão yandere?
Oh Yes!!! ÒwÓ
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crabbymaiden · 2 years
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In Burnt Around The Edges has Papyrus taken other girls before? Why did he suddenly get an obsession with the reader? So many questions!
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He just had a lightbulb moment one day /jk
Reader should have punched Sans harder /not jk
The real answer would be spoilers so I hope you don't mind getting a shitpost instead lmao sorry for the quality
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