
Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/11473704.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/M, Other
  Fandom:
      Undertale_(Video_Game)
  Relationship:
      Frisk/Chara, Frisk_&_Chara
  Character:
      Frisk_(Undertale), Chara_(Undertale)
  Additional Tags:
      Smut, Fluff, Consensual_Underage_Sex, Frisk_is_in_heat, Nonbinary_Chara
      and_Frisk, Frisk_has_male_genitalia, Chara_has_female_genitalia, Saints
      preserve_me_what_have_I_done, Frisk_is_precious, charisk, Only_semi-
      canon, plz_comment, It's_finally_overtaken_the_main_story_in_terms_of
      views, We're_all_thirsty_sons_of_guns, aren't_we, Were-Creatures, Mating
      Cycles/In_Heat
  Series:
      Part 3 of The_New_Wolfrisk_Movies
  Stats:
      Published: 2017-07-11 Words: 4439
****** Lycan't Help Myself ******
by Pokey
Summary
     Since becoming a teenager, poor Frisk has started having heat cycles.
     It isn't until Chara has a panic attack during one of these cycles
     that Frisk figures out what the best source of relief is.
     [Part of the Werewolf Frisk AU.]
Notes
     Took a break from writing the main story.
     I hope to God my mother doesn't see this.
     EDIT: Oh snap, I updated it. There's an epilogue now, taking place
     sometime in the middle of the night.
     Assuming Toriel went in to check on them (you know, as you do), one
     can hope that they had the foresight to cover up with the blankets.
See the end of the work for more notes
Frisk was going to be celebrating their fifteenth birthday, which also happened
to be the eve of the 5th anniversary of the barrier being destroyed, in less
than a week. They still remember when they were officially adopted.

About a week after they'd left the mountain, Toriel had asked Frisk when their
birthday was, and they didn't know. That led to a search for a birth
certificate, and when that didn't turn up anything, any other legal information
on them they could find. Unfortunately, the search turned up absolutely
nothing, so they had to work from the ground up. Toriel said that they were
gonna have new stuff made for them, and so she asked when their birthday was
going to be celebrated, if nothing else. After a few minutes of consideration,
they decided that they wanted their birthday to be the day Toriel found them,
because that's when they felt their life truly began--Chara had rolled their
eyes and groaned in exasperation when they heard that, but Toriel clearly
hadn't found it as cringy as they did, because a few weeks later, they were
presented with new identification papers that all listed that fateful day under
'birthday'. (Unfortunately, with a new life comes new responsibility: they also
had to get their 'shots', but they were relieved when they were told it did not
involve a pistol duel.)

Presently, Frisk is lying on their bed, staring at the ceiling, waiting for
sleep to come. They have the covers thrown back, because the dang things had
some kind of inlaid quality that kept the heat in, which made no sense given
how thin the sheets were.
   They know that, if they're not going to fall asleep any time soon, they
should be thinking about what they're going to do for their birthday, but they
can't get over this weird sensation that's been affecting them. This wouldn't
be the first time this feeling has sprung up--they're pretty sure it's been
happening in a pattern.
   It felt like they were burning up constantly, with the occasional tingling
sensation popping up in various parts of their body. It always felt like a
fever, and it always lasted way too long for their taste. However, there was
one good thing about it: sometimes, certain things would happen in their
presence that made them feel... different.
Usually these events involved Chara to some capacity--one time, Chara was
stretching to work a kink out of their back, and their sweater lifted
partially, exposing their taut midriff. Frisk didn't know why that made them
feel the way it did, but that was just one of many events that led them to
believe it was connected to their attraction to Chara.
   They could be a real jerk sometimes, but they were really smart... and
cool... and funny... and they always made them feel better when they were sad.
For this, Frisk was thankful, and so they repay them by always being available
for a specific thing. Chara would sometimes go into fits of panic or anxiety,
and afterwards they'd want to rest their head on Frisk's thigh, for the purpose
of getting Frisk to stroke their hair, just like at the MTT hotel all those
years ago--it always happened if it was an attack, but sometimes they'd do it
just because. (Thinking about stroking their silky auburn hair right now made
the weird feeling come back. Dang it.) Chara said they liked it even more when
there was a Full Moon in the sky, because "bigger hands mean more coverage,
ergo, more scratchin's."

They're roused from their thoughts by a very distressed-looking Chara--speak of
the devil--opening the bedroom door, walking over to the bed, and resting their
head on Frisk's stomach.
They used to be the only one that could see or hear Chara, and, when they got
killed by Muffet, they could add 'feel' to the list. However, at the time, it
was limited to weight and pressure sensitivity--texture was still a bit beyond
what their ghostly form was capable of. About two years ago, though, they found
a way to give Chara a real body again (thank you, Yahoo Asks), and now, they've
gotten to grow up together.
Of course, that brings them to the awkward position of having their crush's
body heat pressed against them--crushing them, if you will-- begging their
attention. They begin to pet the distressed little demon (well, they say
'little', but, being a couple of years older, Chara usually was rather tall
compared to them, most of the time), as per usual, and Chara releases the
breath they'd been holding at the contact. Frisk can't really enjoy it as much
as they know they normally would, because this... thing... is causing their
thoughts to get all muggy.

The added heat is not helping, either.

"...Chara?"

"Yes?"

"I want to keep petting you, I really do, but I was burning up before I had a
toasty human lying on me. 'Can't think straight." Chara lifts their head off
Frisk's stomach to look at them, and taps into their connection with Frisk's
soul to check their status.
"That...doesn't make any sense. You're not sick, or feverish, or anything. And
it's not the environment doing this either. This is... strange, to say the
least."

"And, um. If..." Frisk curls their fingers a couple of times. "If it will help
you figure out what's wrong with me..." They duck their head. "When I feel all
hot like this, thinking about you makes me... feel funny," they murmur,
bashfully. They're blushing and refraining from making eye contact, which just
makes Chara even more perturbed. They shift on the bed to support themselves on
their arm.
"Um...like, 'strange' funny?" They stare wide-eyed at Frisk--in this moment,
they're filled with a more rational concern for what they think might be coming
next, which just piled onto the butterflies they already had (the whole reason
this whole mess started), which made for a stressful combination.

"No, like...'good' funny," they mumble, sheepishly, beginning to fiddle with
their fingers. Oh, dear.

"Frisk..."

"You make me feel nice inside. You're really cool, and you know a lot of things
about a lot of things, and, and...
"I think you're really pretty," they say, looking off to the side, their voice
clipped and tight. Oh, no, this isn't your everyday Frisk flirting (trademark).
This is them opening up to Chara, telling them how they feel. And Chara's on
top of them.
Chara's mouth goes tight-lipped. Their face turns beet red as they realize how
their position might look to an outsider.

They quickly lift off of them and begin to walk towards the door.

"Chara," Frisk yells to them, suddenly sounding despaired. Chara stops and
turns back around. The kid's sitting upright, looking at them with tears
beginning to prick the corner of their eyes. "What did I do wrong," they ask.
Chara mentally kicks themself. They stride back over to the bed and reach over,
hugging Frisk tightly.

"You did nothing wrong, kid. I... can't handle people telling me things like
that very well, is all..." They back out of the hug to look at Frisk.

"Now, then, about how you're feeling... er..." Their face heats up again.
"Based on what you're feeling, coupled with your apparent... attraction to me,
and your more... monstrous qualities, I'm under the impression that you may
be... in heat," they say, wincing. Frisk tilts their head in confusion.

"I guess that makes sense. It does feel like I'm burning up," they say. Chara
chuckles warmly.

"No, that's not quite what that means." Their smile fades back into a nervous,
thin line. "I don't think humans are supposed to get these, and it's usually
monsters that experience this kind, but you're not entirely human, so I don't
know." They sigh. They're really going to have to explain this. "Your body is
trying to tell you it wants to... make babies." Frisk raises their eyebrows.
"...and, in... order to do that, one must... engage in... intercourse with a
member of the opposite sex," they say, not daring to look the kid in the eye.

"Can you show me how," they ask, bringing a hand to their chin. Chara's head
snaps to attention, an incredulous look on their face, but looking at the kid's
expression, they can see there's innocent curiosity in those eyes.

"Uhhhh..." Chara's face starts glowing as they think about what that would
entail.

"Please, Chara, I wanna make this stupid 'heat' go away," they plead, taking
Chara's hand in their own. Chara gazes down at said hand, eyes still wide as
saucers, and exhale sharply. They move their gaze to the kid's frowning face,
and sigh heavily.

"I'm going to regret this, I'm sure," they say, weaving their fingers together
with Frisk's--their heartbeat quickens--and gently lower Frisk's head back onto
the pillow.
"What are you doing?" They look confused... worried, a bit.
"I... I'm going to show you how it's done, yes?" 
Frisk immediately feels a smile breaking their neutral expression.
Chara looks down at them from their perch on their knees, eyeing the kid's
torso between their legs. They look back to the kid's glorious, emerald green
eyes, how they're filled with nothing but love and admiration. They're cute.
They scoot back towards the foot of the bed, and gently untangle their fingers
from Frisk's. Chara gulps, and slowly moves from the kid's hand to the top
button of their shorts.
"Here we go," they say, quietly, and undo Frisk's top button with a quiet,
metal pop.
---
Chara motions for Frisk to lift their legs up a little bit, and, ever so
gently, begins to pull Frisk's shorts down. Frisk lifts their head, supporting
themself on their right elbow, and they watch Chara nimbly shimmy their shorts
down their legs with bated breath. Chara pauses to look them in the eye,
silently asking for permission. When Frisk doesn't say anything, Chara lifts
their feet up off the bed, and pulls the shorts off the rest of the way. Chara
looks up at Frisk again, who's now down to just a sweater and underwear, and
exhales.

"Are you sure you want your first time to be with me, of all people," Chara
asks, and Frisk nods enthusiastically, grinning with a mouth full of sharper-
than-average teeth; Chara briefly wonders what it'd be like to have those teeth
press down on their neck.

Frisk's gaze follows Chara's hands as they move back up to their waistline,
shimmying their pointer fingers under the hem of Frisk's underwear to get a
good grip, and lightly graze Frisk's skin -- they shiver in anticipation at the
contact.

Chara begins to pull down their underwear, slowly, with the same amount of
caution as before. Frisk grips the pillow tightly, drawing a sharp breath of
surprise as their cock slowly begins to peek out from under the fabric. Chara
pauses to look at Frisk's stiff member, then at their face--they simultaneously
look nervous and ecstatic.

They pull the underwear down Frisk's legs the rest of the way, and lightly toss
it aside. They continue to sit on their knees, with the kid's shins between
their legs, and begin to lift their sweater.

"Wait!" This breaks Chara's concentration, and they let go of it. Frisk
relaxes, and lays back down.

"What's wrong?"

"I--'ve... for a while now... I don't know why, but I wanna..." They pause,
going into a whisper. "S-see your chest. But if your sweater's finally coming
off, I wanna take it off. Plus, it's not fair if you have to do everything,"
they say, voice slowly returning to normal volume.

"Okay...if you say so..." Chara says, somewhat sarcastically, and slowly lower
themselves forward, down onto Frisk's chest. They can feel their breath, warm
and moist. Frisk winces as Chara lowers themself onto them--their cock is being
squished between the two. It twitches, and scrapes against Chara's sweater.
Frisk quietly groans, and looks at Chara with lidded eyes full of love and
need.

"Chara..." They moan. Chara's face becomes even redder. "I need you..." Frisk
lightly pushes them up, and grabs at the hem of their sweater, beginning to
lift it up. Chara squeaks when they feel the fabric leave their midriff,
exposing it to the air, cool and dry, in contrast to their body, which had
heated up considerably in the last few minutes.
   Frisk pauses at the base of their arms, still breathing heavily, and Chara
starts to nervously shift in place, feeling a little shy, but they quickly stop
when it elicits a sharp sound of pleasure from Frisk. Chara blinks, starting to
become aroused as well, strange, hot neediness beginning to flare up between
their thighs. They give, and lift their arms up, allowing Frisk to pull their
sweater over their head.
   Chara brings their right arm to cover their chest, watching Frisk toss their
sweater aside. Frisk brings their attention back to Chara, and their gaze
slowly moves from their fiery crimson eyes, to their soft lips, to their small,
soft breasts, following the subtle curves of their torso.
   Frisk lightly grasps Chara's right arm, gently pulling it away from their
chest, bringing their body back down to rest against Frisk's sweater. Chara's
breath hitches when their nipples scrape against the fabric, and Frisk's
stiffened member twitches at the sound. The two of them lay there, together,
breathing heavily as they looked into each other's eyes. What even are they
anymore? Lovers? Partners?

Chara quietly yelps as Frisk places an ice cold hand on the small of their
back, and another between their shoulder blades, lightly smoothing the skin
over, getting a feel for them. "Chara," they breathe. "Can I take your pants
off?" Frisk doesn't quite get what's happening, but thinking about the tall,
pale senior's body, whatever lies behind Chara's tight leggings... it's making
their weiner hurt so bad, but why? Why, why, why, though? They need to, like,
touch, squeeze it, maybe, putit in something, but what? And again: Why?
Chara gulps, and a smile creeps onto their face. "Okay," they whisper,
excitedly. Frisk can feel their balls tighten at their tone of voice, and bits
of precome begin to bead up. Chara brings their knees closer together, and
inches closer to Frisk to make it easier for them. They grab at the belt loops
of Chara's chocolate-colored shorts, and pull the shorts down their legs in one
swift movement. As the shorts approach their feet, Chara lifts either leg to
free their foot. They're bent over slightly, bringing prominence to the subtle
curvature of their breasts. When they've freed the second foot, they look back
up at Frisk with lidded eyes and a sly smile.

Frisk's erection starts to throb, leaking precome all down the shaft--their
heart is racing as Chara affixes a hand around the waist of their leggings,
pressing their thumb down into the garment. Their breathing must've picked up,
too, because Chara's sly smile becomes a smug grin. Let's see how much they can
stand.
   Frisk makes a small whine, and their dick pulses when their super doggy ears
pick up the sound of Chara's thumb scraping the inside of their pants, when
they see Chara lick their lips seductively, squishing their breasts between
their biceps. Frisk quietly groans, but they still don't know why. They find
their hand slowly drifting to their aching cock, desperate for relief. Chara
quickly drops the act, and grabs Frisk's wrist before it can get anywhere--they
don't need the kid picking up bad habits just because they started feeling
comfortable enough to be an ass to them.

They finally start pulling the tights down their legs--they close their eyes,
exhaling loudly through their open mouth as the wet, aching thing between their
legs comes into contact with the air. After they get used to it, they slowly
climb back onto Frisk's chest, bringing their exposed crotch to rest on Frisk's
stomach. Frisk watches Chara's belly rise and fall, and, looking up into their
eyes, their heart sings; perhaps the "why" doesn't really matter. But the "who"
-- the little 'demon' whom their heart had long since started aching for -
- matters way more. They want to make Chara feel not sad all the time, and from
the way their skin started glowing red in some places, they're probably feeling
a lot like Frisk right now. They steel their resolve.
"Are you ready?"
"Yeah." They are determined.
"Okay," they breathe. Their muscles tense when Frisk lightly grabs at their
thighs, hoping to adjust their position on the bed. They're sat down again on
top of Frisk's pelvis by coincidence. They can feel their butt pressed up
against Frisk's cock; they can feel them throbbing, wet with need.

"Now, Frisk, I'm going to...lower myself onto you," they say, absent-mindedly
pulling at the hem of Frisk's sweater, pushing it upward. They adjust their
position, and promptly lean forward, pressing their breasts into Frisk's
exposed chest. "When I do, it's going to hurt a little, at first. But it'll
make us both feel...so good..." Chara whispers, ghosting their fingers along
Frisk's own curves (which have been slowly turning plump and voluptuous as the
child grows), rubbing their entrance up against Frisk's burning shaft. Frisk
whimpers, squeezing their eyes shut. They quickly nod, biting their lower lip.

Chara slowly lowers themself towards Frisk's cock, finally. They can feel it
begin to press against their entrance, prepped to push into them. Frisk opens
their mouth to say something, but it comes out as a whine. They need to tell
them this, though, so they try again.

"I... I l-love you," they stutter as Chara lowers onto them, taking their
entire length easily. Chara roughly grips Frisk's forearms and doubles over.
They suddenly feel Frisk's heartbeat, hot and throbbing within them, sending
shocks all up their body-- it's nearly too much, at first.

"Hah~" They shiver in place, letting the initial shock pass, feeling it's
electricity course through their belly. After a moment, they begin to move up
and down, ever so slowly, producing smaller, more pleasurable shocks. Quiet,
slick sounds start to be heard coming from between them, and Chara's breathing
slowly starts to get louder.

"Oh... ooh~..." Frisk groans, lightly lolling their head back.

"Chara... I--ahn..." Frisk reaches to take Chara's hand, and Chara accepts it,
nearly crushing it in their grip.

"Hah... hah..." Chara's stomach muscles are tensed. They can feel a coil
beginning to tighten in their belly, and it feels amazing.

"Hoh... hahn~...Don't stop," Frisk whimpers. Chara's thrusting has picked up,
and they lean their head over Frisk's shoulder, in a tight embrace.

"Hhhn--ah! Chara, ohh~" They moan, a lump forming in their throat. They nip at
Chara's ear, lightly sucking on their ear lobe, moaning into their ear with
their eyes closed.

"Gahh... hahh!..." Chara squeezes their eyes shut and bares their teeth; they
can feel Frisk throbbing within them, eagerly bobbing in and out, searing their
sensitive flesh with their modest girth. They press their head against the
shorter child's shoulder, passionately planting breathy kisses all along
Frisk's neck. They feel serene, almost, alone with them.

"Chara... Chara!..." Frisk yells, wrapping their arms around Chara's back.
They've begun to pick up speed, and it hurts. Their dick feels like somebody's
stabbing through it with a spear. They gently knead Chara's back as their heart
swells with affection. 
"I love you so much," they sob, wrapping their legs around Chara's torso, and
begin noisily lapping at Chara's nipple, moaning as they feel their cock piston
in and out of Chara's cozy, beautiful body.

"Ah!... hah!..." Chara can feel that little coil in their stomach winding
tighter and tighter with each passing moment. They start thrusting with more
vigor than ever, groaning loudly as they wrap their arms ever tighter around
Frisk's back. They ache for release but they want it to last forever it feels
so good oh God, Frisk!

"Oh, Chara!... ahh, hahn~!"
Chara starts grinding against Frisk's pelvis, trying desperately to soothe
their aching clit. They want Frisk's red-hot cock to go deeper, deeper--their
libido is raging. Frisk's toes curl up, and they grip Chara as tight as they
can, their dick feels like it's about to snap in two, please Chara please don't
stop!

"Agh! ...Frisk! I... h-hahh!~" Chara groans, their tongue lolling out of their
mouth.
Frisk's tongue, their horrible wonderful tongue! They're sucking and lapping at
their nipples so vigorously, lingering just enough for short bursts of ecstasy
as they ravage them. Frisk, th-they're being so noisy! Frisk, keep going,
please!

"Chara!...I...I...ohh~!" They sob into Chara's chest, suddenly, their voice
rising in volume and pitch. Their muscles start convulsing in their euphoria.
Something's about to come out of them, that scares them, they don't want it to
end, oh Chara please stay!

"Frisk, oh God you're so hot, I, I can't hold it! I..." they yell in distress.
Their pussy's beginning to squeeze Frisk. Chara feels them stretching them,
boiling them alive! They ache for them! Please, Frisk, please?!
They lurch forward, screaming Frisk's name, shivering with ecstacy as their
insides tighten around Frisk, getting tighter, and tighter, pulling them
deeper, and deeper. Frisk's sweltering boyhood is thumping within them, balls
taut with the need to fill them up. It feels so good...

"I love you, Chara!" Frisk bawls. They can feel it coming...!
They cry out, and pull Chara into a bone-crushing grip as the floodgates open.
Chara arches their back, yelps turning into moans as Frisk continues to pump up
into them, seven... eight... nine times, filling Chara with all their love,
bringing the lanky teenager over the top once more.
The two of them rock together, riding out each other's respective orgasms in a
tight embrace. The kid is quietly sobbing as they lay there, but is not quite
sure why, because they're so happy right now. They bury their head into the
crook of Chara's neck, taking in a very shaky breath.

"I love you so, so much," they say in a sad-sounding, watery voice.

"Mm~mph... I suppose, I like you, as well," Chara replies, lifting a lightly
shaking hand to Frisk's head, stroking their hair for a moment as they rest
their own upon it. They know that if they weren't coming down from a pleasure
high right now, it probably would've been a lot harder to say, but right now,
Frisk is just too precious to ignore, they think as they caress their cheek.
They eventually climb off of Frisk, soliciting a sensual groan from them.
Frisk's tan-colored pelvis has acquired a wet, sticky sheen, having been
drenched in Chara's come--proof of ownership. Frisk's breathing still sounds
like they just came from a funeral, but they're visibly very happy, which is
what they deserve to be.

Chara leans in towards Frisk, cupping their face with both hands, and presses
their tongue into Frisk's mouth. Frisk makes a surprised noise at the sudden
intrusion, but quickly wraps their arms and legs around Chara's naked body
again, humming contentedly. A mixture of the two's come leaks out of Chara and
onto their stomach, reminding them. It's real, it's finally real. They moan
into Chara's mouth.

The two eventually back out of the kiss, and stare each other down, panting
heavily. Chara smiles, and quietly laughs. Frisk pushes their hair behind their
ear, and grins eagerly. They pause, though, looking a bit sheepish.

"My teeth didn't hurt you, did they?" They ask, nervously, prodding at one of
their sharper-than-average pearly whites.

"Not at all. In fact, I'm considering going in for more," they say, staring at
Frisk hungrily. Surprisingly, Frisk was a very good kisser, and they
retroactively felt bad for themself for not finding this out sooner. They lean
back in, kissing Frisk greedily for about ten straight seconds. Chara,
partially removing their mouth, mumbles something to Frisk before diving back
in. They're rewarded with Frisk going stiff again. They promptly back out of
the kiss, look down at the newly formed erection, then look back at Frisk, who
goes red in the face.

"I-it's okay. You don't have to do it again if you don't want to. ...You were
just showing me how it works, after all." They look a bit crestfallen.
Chara narrows their eyes, and, all without breaking eye contact, grabs Frisk's
rod and lowers themself onto it with a wet slap, silently welcoming back the
warmth it brings. Frisk's breath hitches. With love in their eyes, they gaze up
at Chara, who smugly grins back at them.
"Hh...happy birthday to me," they say, their voice full of awe. Chara laughs,
and kisses their forehead.
---
In the dead of night, Chara wakes up in a cold sweat, breathing heavily. They
sit up, their knees against their chest, and begin to weep silently for reasons
not even they know. God, they hate it. They just want to sleep...
A hand clutches at theirs. They look down to see Frisk, attempting to comfort
them. Must've felt the weight of the bed shifting. They sigh, squeezing their
hand right back. They always feel stupid when they're caught in a moment of
weakness like this, but they can trust Frisk. Chara lies back down, and
shimmies in closer to them, huddling together. Frisk pulls them in further,
holding them close.
Their bare skin brushes up against Frisk, reminding them of what the two of
them had done, over and over until passing out. Chara smiles, remembering how
Frisk would make those cute little cries and whimpers, how lovely it felt to
have Frisk's come spread through them, stinging their insides with tangy,
golden fire. They sigh contentedly at the memory.
"...You know what's funny?" They whisper to Frisk, pulling the blanket back
over the two of them.
"Hmm..." Their warm breath helps to heat Chara's chest.
"We didn't use any contraceptives," they chuckle.
"I don't know what those are, really, but if I did, I still wouldn't care. It
was great the way it was," Frisk mumbles with surprising clarity.
They go still again, falling into a trend of soft, even breathing. Chara
watches them for a while after that, contemplating their words, and how much
they unknowingly helped Chara's self-esteem. Frisk looks very cute when they
sleep, they think. Chara whispers as they begin to drift off again, bringing
their arms and a leg around their lover, caressing the smaller adolescent;
"I love you."
End Notes
     I have signed my own death warrant.
     Please leave a comment.
     The "sequel":
     http://archiveofourown.org/works/12041484/chapters/27263790
Please drop_by_the_archive_and_comment to let the author know if you enjoyed
their work!
