Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/13813236.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Undertale_(Video_Game)
  Relationship:
      Sans/Sans_(Undertale), Sans/Original_Undertale_Character(s), Papyrus/
      Original_Undertale_Character(s)
  Character:
      Z, Sans_(Undertale), Papyrus_(Undertale), Fuck_Ton_of_Au's
  Additional Tags:
      Ecto-Penis_(Undertale), Ecto-Tongue_(Undertale), Ecto-Genitalia_
      (Undertale), Ecto-Tentacles_(Undertale), Other_Additional_Tags_to_Be
      Added, Anal_Sex, Consensual_Underage_Sex, Underage_Kissing, Public_Sex,
      all_the_sex, A_smut_book, Shameless_Smut, Smut, Loss_of_Virginity, Ton_of
      au's, Older_Man/Younger_Man, Based_on_a_Dream, Z_is_12_btw, lol, The
      Author_Regrets_Nothing, Author_loves_to_chat_in_the_Comments, Porn_With
      Plot, Well_some_kind_of_plot, Penis_In_Vagina_Sex
  Stats:
      Published: 2018-02-27 Chapters: 1/? Words: 3411
****** Z's Sexcapades ******
by LunaXXMoon1
Summary
     Z, son of G, wants his dad to recognize him and give him affection,
     as a normal father should. However, when he hears his dad and uncle
     talk about sex on one inconspicuous night, he decides that he will go
     around the multiverse, hvaing sec with everyone, until he has beaten
     his father record of most people fucked!
     (Z is an Oc, but I think he fits this story! Based off a Dream I
     had!)
Z, with one clear goal in his mind, set off for the ever so popular 'Undertale,
or the original universe, that everyone held, and loved so dearly to their
undead hearts. Z hoped through the manmade portal, which was actually made by a
device he created himself.
Lots of scrap from the 'Fusion' incident, gave him lots of opportunity to make
whatever the hell he wanted. So far, he made a lot of useful gadgets, which he
all loved, with care, and DETERMINATION.
He made grappling hooks, clocks, robots, hell, even a 'Gold' generator, but no
matter what he did his father always seemed so... unimpressed.
' "Dad! Dad, look what I made!" A 7 year old Z cheered, running to the one and
only fuck boi of the multiverse, G. Said playboy looked down at his (failed
abortion) son, and saw what he had in his hands, which was way to big for the
small skeleton to carry by himself.
What G saw was too unfathomable for him to understand. His son, only 7, may I
remind you, was holding a huge metal clock in his hands.
Exposed gears, and the loud ticking make G even more confused. How did, his 7
year old son, make this?
"You made this Z?" G asked, still very bewildered that a 7 year old could make
a clock like this one. However, he could see some of the mistakes that a young
child could make. Such as the exposed gears, which could simply be stopped by a
small pebble if it got caught in the wrong, sensitive gears.
Also, the ticking was way too loud, even for a clock as large as the one the
other was holding. He noticed the the numbers in the clock were a bit off as
well, and the hands were crooked. Other then that, his son did a decent job.
"Cool" G said, glancing off to the side. His voice wasn't filled with pride,
nor dignity, just, emptiness, that his son hated. Z, thought that his dad
didn't like that.
Instead of crying, like a normal skeleton child would do, a DETERMINED look
crossed his face, as a red spark flashed in his normal mint green colored eye
lights. He grinned, handing his father the clock, and heading back to the area
where he gathered his supplies.
G didn't even have enough time to asked his son where he got the materials to
make it. G glanced down at the clock in his hands, before heating home, and
hung it up.'
However, nothing seemed to work with his father, and it made Z want to quit
trying to win his father's affections, go home, and cry. But no. He wouldn't.
Why, you ask? Well, his DETERMINATION wouldn't let him. He had way more than
the average monster would, but he hasn't turned into an amalgamate yet, so that
was a plus.
Although Z was only about 12, (He forgot his age after he turned 9) he was
DETERMINED to get his one and only father to love him, even if it would kill
him.
Z smirked as he was traveling the multiverse, searching for Undertale, or as
people called it. He hadn't found the universe's code yet, so he was just
scrolling au's with a bored expression. He rubbed his mint green goggles,
something he often did when he was bored, or just stressed.
He wasn't getting enough sleep lately but it was definitely something. He
finally found the famed 'undertale' that anybody that was anybody, loved.
He hopped through a portal, which border's were blue, and jumped into the white
snow, which he hadn't seen in at least a few years.
He sighed at the familiar feeling of snow under his shoes, and started to walk,
the newly laid snow crunching under his converse's, his jeans dragging through
the snow, as they were laying on his shoes lazily.
I guess I should explain Z's goal right about now. Once, well, about 3 weeks
ago, he heard Uncle Papyrus and his father, having a small drinking party. It
was only them, but they considered it a party. Anywho they were talking about
who they 'fucked' and what 'kinks' they had.
Z searched it up, and his face pretty much lit up the whole room as a whole,
and it didn't stop. at least until it was morning. And hell, even after that, a
light mint green was dusting his cheeks the rest of the day.
He couldn't stop thinking about it, that his father, the one he held so dearly
to his heart, actually did that stuff with other people.
So, he heard his dad say that he 'fucked', or rather 'sexed' up, more than 57
people. To Z, that was a helluva numbered. However, this was his goal. To beat
his own father at the sex game.
Now, he knew that his father was called a 'fuck boi' across the multiverse, and
this would be a pretty hard challenge for him, considering that his father has
had sex with so many, and this multiverse was so little.
And, about that tip about multiverses, yes, he has been to others. When you
have enough free time, you can do, amazing things, and things that you'd never
think you could ever do before!
Z untied the leather jacket around his waist, and put it on properly, almost
looking like a miniature copy of his dear old pa, except his magic color.
A bright mint green, is what separates him from his father, as it wasn't much.
He had small, scarce lines going down his cheek, and forehead, but he didn't
have that creepy smile his father had.
He could actually smile, like a normal person. However, his dad told him that
his smile was 'cute', which made him a bit more determined than usual.
It made him feel happy that his dad was actually complimenting him, and more
so, lowkey giving his own kin some affection, which he yearned for.
Anyway, back to the story. Said son of G was walking through the uncultivated
snow, laying fresh footprints on the snow that had just fallen from the
infinite source of it (Which he had never figured out where it came from). Z,
put on a small smile as reminisced in the nostalgia, of the fresh snow, the
crunch of it, hell, even the cold chill he got when snowflakes fell on his
nose.
He likes the individual designs that they all had, reminding him of the
skeletons of the multiverse. No one was exactly the same, yet they were all the
same person. That somehow confused Z.
Z, eventually saw another skeleton, that had white eyelights. A thin blue
jacket covered his bones, tightly, making it seem warm.
Some floof lined the hoodie, as the small skeleton slept. He had tired bags
around his eyes, telling Z that the skeleton, if ever, never really slept that
good. Z felt some apathy toward the other. Rather countless and restless nights
of anxiety attacks and working senselessly.
Z slammed his hand on the counter of the small booth that the shorter skeleton
was sleeping in. 'Rather unresponsible' Z thought, scoffing slightly.
Z slammed his hand on the counter again, startling the small skeleton, to the
point where he woke up, his tired eyes making it clear that this was one of the
only times he got rest, during the twenty-four hours of the day. The small
skeleton rubbed his eyes, and looked up at Z with a yawn.
"G? is that you?" The skeleton asked, rubbing Z's small marks on his face. Did
he really look that similar to his father.
He brushed the affectionate touch from his face, with a frown, and removed the
other's skeletal hands. Z sighed, looking at the skeleton, his mint green
eyelights meeting white ones.
"I'm not G. That's my father. My name is Z, Boo~" Z flirted, his eyes slanted.
The smaller glanced up a Z, small blush on his face.
"Didn't know G had a kid. How old are you anyway?" The unknown skeleton asked.
Z, seeing no reason to lie, answered blatantly, "12, or I think?" trailing off
when he said I think.
'Mental note to self to make an age estimate' He noted, before looking back at
the other, who looked completely astonished. "kid, what the hell are you doing
here for?" The smaller glared at him.
Z stepped back, intimidated.
"T-to make my dad proud of me" Z said, DETERMINEDLY.
He wouldn't have a second best of a son for his father, whom he praised so
much. And though, he was probably a mistake, in his father's eyes, and he
probably didn't even want him, he would win that man's affection, because he
loved his father.
Nothing would change that fact, and nothing could change his DETERMINED
mindset.
The blue clothes skeleton looked at the other with clear awe, an innocent look
on his face.
...
It looked kind of cute to Z.
As soon as the expression appeared, it was gone just as quick. "and how do you
expect to do that?" The other asked, purring the question as if he was the
cheshire cat.
Z glanced down at the other. "Before I answer that, may I catch your name? I
never heard it. And if you don't give it to me, your nickname will be boo~" Z
said, his eyes slightly lidded. The skeleton held his hand out expectantly, as
if he wanted Z to take it.
"the names sans. sans the skeleton" Sans winked, giving Z a urge to giggle.
"...aren't you gonna take my hand?" Sans asked, slightly weirded out by Z's
mannerisms or rather, how he was raised. Z raised a skeletal brow, and said
blankly "Why would I? Is it some type of greeting? I was never taught this" He
said, staring at sans' hand as if it was a foreign substance.
Considering that Z worked with chemicals from time to time, this was pretty bad
if he thought sans was toxic, if not, a dangerous toxin.
"it's a greeting kid. shake my hand" Sans explained, shoving his hand toward
the oblivious skeleton.
Z raised a doubtful skeletal brow, and scoffed, but without being have to be
told twice, shook the other's hand. However, he copied what he had seen his
father do many times.
He put an arm behind his back, bends down, and kissed the hand of the other
male skeleton. Sans' cheekbones had a small blue blush as he averted his eyes,
hiding his ever growing skeleton smile in his blue jacket.
He coughed awkwardly, before looking at Z once more. "so kid, you never quite
answered my question" Sans asked, giving the boy a soft glare, as said boy
smirked.
"I want to have sex with everyone I can, and beat my father's record" Z said,
very bluntly. Giving a bland stare at the other, who in turn of Z, was awking
at the other, looking as if eyeballs might pop out of his eye sockets any
minute.
"s-sex?" Sans muttered, looking as if he had misheard the other, who nodded,
grinning a silly smirk that he only wore when he knew another person was
confused or didn't believe him.
"You heard me correctly, Mr. Sans. I popped into Undertale, so I could find
someone to start with. And if you don't mind.." Z scratched the back of his
skull.
Z came prepared, and he pulled out a bouquet of flowers, which he planned to
give one to each of his lovers. He pulled out a light blue one, reflecting the
other's magic color almost to a T.
"Will you be my first, Mr. Sans?" He asked, his own skull lighting up a bright
mint green. Sans however, still has a small blue blush. Nothing giving away his
answer or reaction.
"...and, you're sure that your dad won't mind me doing this?" Sans asked
tentatively. Z's eyes brightened considerably.
"I promise he won't ever find out, unless you want him to" Z promised, little
stars in his eyes. Sans then chuckled, lacing his fingers with the son of G's.
"then take me away, Z" Sans winked.
Before Sans could actually even blink, he was slammed down on the desk of his
own sentry station, Z on top of him, though not exactly closing the gap between
them. Z held the base of Sans' grin, giving him a remorseful look.
"Sorry if it's not satisfactory. I've never done this before" Z apologized,
before locking his lips with Sans. (Let then have lips and shit so they can
kiss. Ecto-bodies and shit).
A skinny, but long, almost like a snake, mint green tongue, slithered into the
other's mouth, tasting the eternal blackness that was the other's wet kissing
cavity. Sans tasted like red grapes, which surprised Z. He had heard many
rumors about the original Sans enjoying ketchup.
So why did he taste like this? Z gave a mental shrug, as he intertwined his
mint colored tongue with the others. His own taste, pancakes, went well
together with the taste of berries. It tasted like they belonged.
Z likes that taste.
Z cupped Sans' cheek, before separating. Z, who was breathing hard from the
kiss, took a few moments to catch his breath, before he slid his tongue in
again, wanting to taste the other a bit more.
"h-hey wait" Sans yelped, before Z sensed his distress. Z wiped any of his
saliva from the corner of his mouth, looking down at sans.
"S-sorry" He apologized, nodding. His black gloves soaked up the mixed saliva,
that the two specimens combined together. Z's eyes slid down his treat (Sans),
and noticed a glowing blue 'something' in his shorts.
Z gave a confused look at sans.
"What's this?" He asked not waiting for the intelligent response sans would
give him, and instead placed his hand on the rim of the other's shorts, and
pulling them down quickly. What was there, was a light blue erection, which had
Sans covering his skull with his hands, the shining blue blush not being
covered by the simple skeletal hands.

Z had the urge to lick the erection, as he had learned the name from the
internet. So Z did. He grabbed sans, and gave him a small mumble to 'stand up'.
Sans obeyed, even though the stand was wobbly, he was still standing.
Z licked the tip, seeing a strange blue liquid come out of the top. He
tentatively licked it, and tasted it, which gave Sans' shivers.
Z hummed, as he liked the taste of the strange liquid coming out of the other's
penis. Without any warning, Z took the whole thing in his mouth, down to the
base.
Sans, not being warned about this, drawled a long moan, trying to keep it in.
This was a vanilla universe after all. However, down there, Z was having the
time of his life. Science, and collecting information was basically Z's life.
The information he was collecting this time, however, was more satisfying, if
he could put that into words. The loud, but subtle noises the other was giving
off, made Z shiver, even if he wasn't the one being pleasured.
He thinks he was getting an erection too. Same as Sans. His clothes were
getting tighter, as at the same time, it was getting off. Still focusing on
giving the other pleasure, and sucking the other's cock, he took off his
leather jack, still very concentrated.
Z jolted the tiniest bit when he felt sans place a hand on the top of his
skull.
Sans' penis twitched inside of him wet mouth. That is what he wasn't expecting,
as he continued to suck the other off. His clothes were getting tighter, as he
felt like he just had to take them off. He slid his mouth off of the other's
penis with a quick pop.
"H-hey Sans" Z started, licking his lips, savoring the taste. "May I take off
my pants?". Sans looked Z up and down, before grinning.
"of course you may, Z" He agreed. As soon as Sans complied, he slid them off,
indeed showing a long erection, at least 7 inches if he knew his measurements.
Sans stared at Z's erection as he chuckled. "you sure are compensating for
something, aren't you kid?" Sans asked jokingly. Z, however, didn't know what
the other was thinking.
Z saw Sans' hole as he was joking around. If he knew, which he did after all
that studying up on sex and other things, he had to prep Sans. He took off a
glove, and placed his fingers in Sans' mouth.
"Suck" he ordered, giving Sans' an irresistible half lidded look. Sans, obeyed,
unconsciously, as he suck Z's fingers, the light blue saliva coating his
fingers.
He lined up his pointer finger with the other's hole, and said "Are you ready
for one finger?". Sans nodded, putting his legs around Z's neck as the other
pushed inside the other's asshole, and making a 'come here' motion with his
finger.
"Nya~" Sans moaned, pushing his pelvis into the other's fingers. Z tried to
focus on the one finger, but Sans was moving so much, and squirming, he got
frustrated.
Without asked, he added another finger, curling them inside the other, enjoying
the needy whines of the other Sans. Z looked at the others expression, and what
he saw, make his erection grow even bigger.
Sans' expression was pure bliss. His white eyelights were in his skull. while
he didn't let the bright blue blush bother the pleasure. It was covering both
cheekbones, as he let his tongue lull out of his mouth, teeth parting.
"What do you want sans?" Z asked, as in did he want him to add another finger,
or just start having sex. Sans bucked his hips into the other's fingers once
before before begging needily, and hungrily, "i want you to fuck me~
pleasepleaseplease" He begged, practically pleaded.
"Alright, Alright, Boo" Z chuckled, lining his cock up with the other's
entrance, before whispering into Sans' ear and said "Ready to get fucked?".
Sans gave Z a kiss as confirmation, and as expected, Z thrusted into Sans, and
the latter let out a loud careless moan. Z kept thrusting, at first a slow
speed, but the, after he realized how hard Sans was squeezing on his penis, he
went a little bit faster, wiggling his hips as he fucked Sans from a different
angle every time he thrusted into the smaller, and shorter one.
Z leaned over, and bit down on Sans' neck, sure to leave a mark.
"Z-z please, more~" Sans pleaded, giving another delightful moan. Z growled
into Sans' ear as he thrusted into the other faster, as ordered. "O-oh god! I
think I'm g-gonna~" Sans didn't have enough time to finish his sentence as he
came, lines of light blue cum squirt out on the both of their shirts.
After a few more sloppy thrusts, Z came too, filling Sans with his cum, and
through the transparent ecto body, anybody could see the colors mixing, making
a light cyan color.
That made Z satisfied.
"So, Sans-" Z started, only to see that said skeleton was asleep. Z sighed,
before getting dressed, and wiping off the cum covered shirt as best as he
could.
It still left some marks, so he took off his black t-shirt, wrapped it in some
snow, and dressed sans up, and cleaned up his shirt. The stains on sans' shirt
fit in with all the other stains, so he didn't have to wrap it up in snow like
he did.
He carried sans, In his arms and into town. He saw all the building that
would've been in his universe, but wasn't.
"SANS! WHERE Are you...?" A new skeleton yelled.
He had a bright red scarf, which looked torn, as well he adorned a seemingly
glowing white royal guard babble body, and a jean booty shorts that adorned his
pelvis, which made Z grin.
"SANS! ARE YOU OKAY!?" The tall skeleton asked. "Um.. I'm Sans' friend. Can I
bring him inside? I can help.." You whispered.
Cutie's eyes widened as he beckoned you inside, and almost in a flash, you went
inside,without having to be told twice. You set sans down on the couch, as the
other skeleton glared at you, waiting for an explanation.
This would be fun.
Please drop_by_the_archive_and_comment to let the author know if you enjoyed
their work!