Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/5945143.
  Rating:
      Explicit
  Archive Warning:
      Rape/Non-Con, Underage
  Category:
      M/M
  Fandom:
      Undertale_(Video_Game)
  Relationship:
      Sans/Papyrus, Papyrus/Sans, swap_Sans/Swap_Papyrus, fell_Papyrus/Swap
      Sans
  Character:
      Underfell_Sans_-_Character, Underfell_Papyrus_-_Character, Underswap_Sans
      -_Character, Underswap_Papyrus_-_Character
  Additional Tags:
      Immortality, NSFW, Blow_Jobs, kinky_little_Skeleton, Kinky, kinky_af,
      Incest, Fontcest, fun_times
  Stats:
      Published: 2016-02-07 Words: 1601
****** Surprisingly Kinky ******
by DeathPunkin
Summary
     Underfell Papyrus loses his brother and decides to take a replacement
     for a while. Needless to say, things don't go quite as planned.
Notes
     So this was partially inspired by Ammazolie art chains. There's one
     where Underfell Papyrus and Underswap Papyrus get down and dirty. It
     led me to thinking, I know Underswap Sans is portrayed as a precious
     cinnamon roll. The thing is, I don't believe that Underswap has
     nearly the control that cannon Sans has. I believe that he's a bit of
     a mess, but tries anyway. That's what endears him to me. Anyway, this
     is supposed to be what I think would happen if the two universes most
     likely to end in incest were to meet.
See the end of the work for more notes
Papyrus can't find his lazy brother anywhere. He had tried the phone, that had
been his first attempt. Sans did not pick up. Papyrus had just figured that the
little midget had fallen asleep at one of his jobs once again, or perhaps he
was collecting information and being useful for once. No dice, his phone wasn't
even on. A half of an hour later and there was no sign of the skeleton. Not a
phone call or an appearance. So Papyrus had begun his search. He was not at his
guard post, any of his jobs, nor was he at Chillby's. Papyrus by this point was
seething with rage. Where could his stupid brother be. Two more hours had
passed, leaving the count at five. Papyrus decided that was just too many to
tolerate.
There were other versions of Sans in alternate universes. One of them could pay
for his brother's mistakes. His Sans seemed to be close with two versions of
himself in particular. Those were the science Sans and the swapped Sans, if he
was remembering correctly. Choosing one of those "friends" would be the best
way to seek revenge on lazy the skeleton, as he would have to watch said
"friend" slowly fall apart. That would be hilarious, the best joke a Sans has
ever made! Still, the science Sans would probably break off the connection
between worlds if he was the one to satisfy Papyrus. So he decided to use the
little pipsqueak from the swapped world.
That is what lead him to now. The tiny skeleton from the backwards world is
jumping around him in joy, and it's almost enough to make the taller skeleton
sick. Still, he listens as the other skeleton rattles on about how he's so
excited to see this version of his brother. The kid is over enthusiastic, but
the praise is nice. It further cements that this was the right decision. "Hey,
you're friends with my brother, right?" Papyrus asks the smaller skeleton.
"Yeah of course, we go on all kinds of adventures together! He always shows me
so many secret new places to explore down here. It's great! I know he just
adores spending time with the great Sans, and I bet I can find him really
quickly!" He says happily. The kid fell for it hook, line, and sinker.
"Good, follow me, and I'll lead you safely through the rift," Papyrus orders.
The kid nods and happily follows. Good, monsters will think having his brother
dressed up like this is a new kink or some shit like that. They never seemed to
mind before and besides, fucking a sibling is surprisingly common as it reduces
liabilities. It's better to have multiple ones in one monster than to have your
weakness spread out in several of them.
Papyrus leads Sans out of the lab and at the kid's suggestion, to his house.
That's actually where Papyrus wanted to take him from the very beginning, so he
doesn't mind the truck. As soon as they enter the house, Sans immediately
rushes up to his worthless brother's room and starts searching around. That's
fine enough, Papyrus doesn't want to get the mess from his plans all over his
own bed. He picks up Sans from where he was investigating under the bed and
carelessly plops him on the bed. "Papyrus, what's going on?"
Papyrus growls in response to that horribly innocent face the skeleton makes.
"It's been too long, and I can't hold it anymore," he replies while sliding his
skinny jeans down enough to release his aching member. "You're going to
pleasure me," Papyrus adds in response to the stunned look on the other's face.
Sans suddenly perks up. "Okay!" He says happily, and he moves to where he can
pull Papyrus onto the bed by his hips. Papyrus allows it, purely out of
curiosity as to what the tiny blueberry intends to do.
He barely has time to spread his legs a little before the other is there,
licking kittenishly at his dick. The tongue is enough to make the horny
skeleton ache even more. He grabs himself at the base, and strokes a bit to
help with some of the building pressure. A needy whine convinces him to move
his hand. Sans starts to tenderly suck at the tip as his tiny hands run over
the rest. "You're a needy little cock slut, aren't you?" Papyrus asks with a
dark voice full of lust.
The nod he gets in response feels good in ways that it shouldn't. The near
painful scrape of those teeth and the sweet relief of that soft blue tongue
feel great. Then Sans swallows him whole. The sudden warm heat feels too good
to be true. Papyrus really enjoys that feeling.
Soon enough, Papyrus tires of this play. He feels that the smaller has had
enough of the illusion of control, so he restrains those skilled hands with a
bit of magic, and then grabs Sans by the skull. He slowly pulls him off, and
then harshly slams that head down again. It feels so good, it makes Papyrus
want to groan his pleasure. He keeps going and going, enjoying the tiny
chocking sounds, and the vibrations those send all along his member. Just
before climaxing, he pulls the other off.
There are tiny little heart shapes in his eyes, which Papyrus personally finds
to be gross. Still, he jerks off until his release spills all over the face of
this tiny Sans. A sense of accomplishment fills him as he observes his perverse
piece of art work. The taller skeleton enjoys how utterly wrecked and lewd he's
made this version of his brother in a matter of minutes.
"Please," Sans cries out with a flushed face. 'Please what?' Papyrus wonders in
his post orgasms bliss. "Please Fuck this hole too," he pleads loudly at the
lack of response, shaking his butt to draw attention to it. Actually, the scene
is pretty cute. Not that it would affect someone in as great of a standing as
Papyrus so easily.
"Why should I? I could very easily be done with this much, and just leave you
out to dry," he mutters darkly. He really can't wait to see what this
interesting little monster has in store. Plus begging is always a really nice
thing to hear.
Much to his surprise, the little Skeleton leans up closer to his face and gives
him a pretty intense look. At least more intense than he'd seen his brother
give in recent memory. "You're a Papyrus, just like my big bro. He's never
satisfied with just one time. He always loves to keep going at it until we
reach exhaustion, and sometimes even after I fall asleep," he says simply. That
shocks Papyrus a little bit. That means that he isn't the only one to suffer
from boughts of insatiable lust.
His attention is pulls back to the tiny body on top of him. "So please, please,
take me roughly Papyrus!" He cries out. Despite being incredibly strange, and
this starting to drift a little bit outside of Papyrus's comfort zone he
decides to Fuck him. A good leader gives to the needs of his followers, but
snatches just enough away to leave them begging for more. Well, at least in the
beginning they do. From there, they do as they please.
Papyrus flips Sans over so that his tiny little dick is rubbing against
comforter on Sans's bed. Papyrus may be a little soft for this, but he still
can thrust into that small, writhing body beneath him. so he does. He thrusts
his dick into that tight little hole at a pace specifically for his pleasure.
Not that Sans seems to mind. He keeps gasping with each snap, and he chums from
nothing but Papyrus's relentlessly pounding dick inside of him about halfway
through. Papyrus just keeps on thrusting into that soft and limber body until
he reaches his second release.
"Thank you," the tiny and freshly fucked Sans says with an exhausted and
grateful voice. Normally, Papyrus would be all over these delightful little
manners, but this level was one he just finds creepy. Papyrus cleans them both
off with a flick of some consumption magic. Then he picks up the smaller and
now fully clothed skeleton. "Papyrus?" The skeleton asks sleepily. Yep,
definitely weird. This one is going back.
He hurries to the portal, and jumps to the swapped world. Thankfully it doesn't
take him too long to run into that world's Papyrus. "Papy?" The tiny skeleton
in his arms mumbles.
He throws the short little Skeleton at 'Papy,' and surprisingly, he catches
Sans. Papyrus can see the gradually darkening look solidifying on the other's
face. "You two are into some seriously kinky and weird shit. I'm generally not
one to kink shame, but several of those make me feel uncomfortable. Next time I
will find my own worthless brother and leave yours alone," is what he says.
Papyrus is just happy to be free of that weirdness. He knows there's a whole
mess of little kinks lying under the surface, and he doesn't care to explore
them.
He is almost back to the portal when he hears a shout that he refuses to
acknowledge. "Kink shaming is a kink of mine too," nope. Not gonna even touch
that one. Papyrus returns home to see the cause of all that frustration asleep
on the couch. He groans, and decides that his own brother will be not so happy
to find out where he wakes up.
End Notes
     I fixed it. Sorry for the errors before, I am currently home sick,
     and have typed the entire thing on a malfunctioning tablet. Please
     forgive the mess and feel free to comment. Also, I have a Tumblr. My
     name is deadpunkin. My icon is a pumpkin with a cat beanie. Feel free
     to send me questions/prompts/challenges I would totally love that.
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