Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/11628867.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/F, F/M
  Fandom:
      Fire_Emblem:_If_|_Fire_Emblem:_Fates
  Relationship:
      Elise/Camilla
  Character:
      Elise_(Fire_Emblem), Camilla_(Fire_Emblem)
  Additional Tags:
      Transformation, Age_Regression/De-Aging, Incest, Age_Progression,
      Genderbending, female_to_male
  Series:
      Part 2 of Tome_of_Motherhood
  Stats:
      Published: 2017-07-27 Words: 3587
****** Tome of Motherhood | Chapter 1 - Switching Sides ******
by CTFMeister
Summary
     Elise uses the tome she received to try and become an adult. Does it
     work? And what will her sister, Camilla say if it does?
Notes
     Woo, first part is up. Hoping to get these up in a ~weekly basis.
     Hopefully. This is my first major project, and with luck I'll
     actually finish it. I think I liked most of the way this went. As
     always, all criticism is welcome and encouraged, it really helps.
     Also, Incest beware.
Elise sat in her tent exhilarated, as she read the tome she had just acquired.
This tome contained detailed instructions on how to cast spells that modified a
person’s age.  She didn’t know if the spells actually worked, of course, she
hadn’t tried them out yet. But the possibility alone that they could work was
enough to get her excited.
There were many age changing spells depicted along the pages. Though one would
think these spells would be simple, just make younger or make older, each spell
had very specific changes in age, along with very specific side effects. Elise
skimmed through most of the spells, but finally turned to the one she wanted.
After searching through many age increasing spells, she had found one that
would increase her change her age to that of an adult, around 30, be somewhat
easy to cast, as well as increase her sexual appeal. Sure, she could just use
the regular ageing spell, but if she was going to become an adult, she might as
well become a sexy one.
She read the spell over and over, taking each line with intricate detail. Since
the transformation meant quite a lot to her, she didn’t want to mess it up.
Besides, she had gotten the book from a shady character, so who knows what
would happen if she got it wrong.
Elise put the book down with a satisfying sigh, having read through the spell
thoroughly. She had basically memorized it at this point, such was the
magnitude of Elise’s anticipation. Her body quivered with excitement as she
stood from her bed and walked to the center of her room, positioning herself so
that were she to lose balance, she would not crash with any objects.
She took deep breaths, trying to calm her trembling body down. Breath in,
breath out, slowly until she had taken control of her body back, assuming a
serene and calm state. Now, with her eyes closed, Elise recited the spell
aloud, making sure to enunciate the words powerfully and with certainty. Her
incantation finished, she waited patiently for the results of her spell.
And so, she waited. Eyes closed and unmoving, she stood inside her empty room
waiting for a sign that her spell had worked. She waited. And waited. And,
though she wished to remain optimistic, as time passed a new feeling began
arising. Angst. Slowly but surely, the feeling of angst began creeping into
Elise, making her open her eyes.
She rushed towards the book sitting on her nightstand. Directing herself to the
page of the spell, she read and reread the spell, its details, its incantation
over and over again. She scanned the page from top to bottom, in an attempt to
find some extra detail she might have missed. But as she scoured the page for
this fictitious extra detail, a sudden realization crept in.
Slamming the book shut, she plopped onto her bed, a huge pout forming on her
face. She had been had. That nasty merchant had given this gullible little kid
a ‘magic book’ as some sort of prank. She could bet that old lady was laughing
her ass off, knowing some dumb kid actually believed her. Tears began to form
in her eyes.
‘Camilla was right’ She thought, crossing her arms. ‘I am just a stupid little
kid. I can’t believe I fell for this.’ She turned to her side. ‘Only a dumb
little kid would think this would work’ Then, as she closed her eyes, she began
to feel a tingle inside her.
The strange tingle had actually appeared not too long ago, though when it began
it was barely noticeable. Now she could actually feel this sensation, which
appeared in the middle of her chest. The sensation wasn’t uncomfortable, but it
definitely wasn’t pleasurable. It felt like something was taking up space in
her chest. It kept growing slowly, until it reached something that felt like
the size of a small ball.
Then suddenly the ball shaped buzz burst, and the tingly feeling began to
disperse into small lines that traveled through her limbs, reaching out to
every corner of her body. Elise’s body tensed up, her limbs becoming stiff as
she shifted uncomfortably. Then, as suddenly as it appeared, the feeling died
down, letting Elise relax. She sat upright, wondering what had happened.
‘Did it work?’ She thought. Before she could check though, her transformation
finally began. Warmth spreading throughout Elise’s body. Not an uncomfortable
heat, but rather a pleasant glow, which would cause her body to metamorphose.
First, she felt her limbs being tugged as her bones stretched out and her
height increased inch by inch. It was felt a bit unpleasant, though not
painful. Her face shifted, becoming more refined and matured. Her innards
burned as new body mass was generated. It filled her thighs and thickened her
hips, accentuating her feminine features. Her butt became more ample and
curved. Her breast ballooned, expanding from meager B cups to enormous F cups.
As the changes occured, Elise panted furiously. She grasped her bed tightly
with both hands, sweat falling profusely onto her covers; feeling a mix severe
pressure and mild arousal from the contortions of her body was going through.
Soon, the pressure coming from Elise’s new breast became too much for her dress
to handle as it ruptured, causing her breasts to fly out free from their
constraints. Luckily for Elise, her bra was sturdy enough to contain the sudden
expansion, remaining intact though stretched out past its normal proportions.
She threw her shoes off her feet before they would suffer the same fate, as she
began feeling the same familiar pressure in her feet, which also grew, though
not to the same extent.
Finally, her transformation had stopped, her warm feeling still lingering while
Elise recovered. She panted, limbs stretched out in different directions, as
she attempted to catch her breath. Though it was over, the intensity of the
change had left her breathless. She relaxed her body and a smile crept over her
face.
After regaining composure, she stood up slowly and walked calmly towards her
mirror. There she found a strangely familiar looking person staring back at
her. They looked quite similar, the main difference between her and it being
the height and the huge melons that propped from the rupture in its chest.
Elise smiled as she looked at the reflection. She knew that the spell had
worked.
She stared at herself keenly, taking in every new detail she could find. Her
face had shifted, not by much, though it had become more mature looking. Her
body had become curvy and feminine, looking like something from a soldier’s
dirty magazine. She was also quite tall now, probably around the height of her
elder siblings. Or would it be younger now? Elise giggled.
And of course, she had to address the elephant in the rooms. Or rather, the two
elephants that were hanging from her chests. She took her hands and tried to
grasp her massive melons. It was quite a surprise to think that something that
big could be held only by her chest. She turned her body sideways, taking in
every single angle of her body she could. Looking at her butt, it was plentiful
and rounded, quite pleasant to look at. She gave it a little slap and was
pleased by the small jiggle it generated.
“Oh my god” She said, gasping immediately after. It seems her voice had changed
as well, not by much but it was definitely deeper. “Wow…” Her voice had silky
smooth tone that was soft on the ears. Content with her changes she jumped
around her room in joy.
“I can’t believe it actually worked!” She said to herself. She had not only
achieved her dream of becoming an adult, she had also become a really sexy one.
She found it hard to contain her excitement, wanting to run outside and yell to
the world about the new her. She couldn’t do that though, thanks to her
wardrobe malfunction.
‘I know! I should go show Camilla’ She thought. ‘Let’s see what she thinks of
me now that I’m an adult!’ Taking the book into her arms, she bolted quickly
but quietly to Camilla’s tent. She could try to put something else on, but her
excitement rendered her unable to wait much longer. Besides, it’s not like
anything else would fit her anyways.
 
Camilla was lying down in her bed, reading what seemed to be some boring
strategy book. In reality though, inside the book was another smaller book of
romantic erotica. ‘Since it’s pretty late, I won’t be interrupted. Considering
that…’ She thought, as she shifted into her covers, her pants having come off
sometime before. Suddenly, an unknown woman popped into Camilla’s tent, causing
her to flinch back in surprise. Quickly she closed both books and placed them
under the covers of the bed, then turned her attention to the strange woman.
“Hey, hey Camilla! Look!” Said the girl, as she presented herself proudly,
pushing her chest a little bit forward. Camilla felt like she had seen this
girl before, though if she did she couldn’t truly remember her. She appeared to
be dressed just like her sister, with the same signature cinnamon roll hair,
except she seemed to be much older and better endowed. In fact, one could say
she looked like an older version of Elise. A costume? Some fan? She shook her
head in confusion.
“I’m sorry,” Said Camilla, confusion showing in her tone. “Who are you?” Elise
sank down with disappointment.
“Huh?” She said. “It’s your little sister Elise!” This made nothing clear as
once again, Camilla was hit with a wave of confusion. That didn’t make sense.
Yesterday Elise was a small budding flower and now she was looking like a
bombshell gal that looked older than her. It couldn’t be true. Surely this was
some sort of prank.
“Look miss. I don’t know who put you up to this, but it’s quite late and I’m
not in the mood for these kinds of jests.” She answered sternly. Elise frowned.
“Camilla, it really is me!” Elise told her, distress in her voice. “A lady gave
me this magic book with all sorts of age changing spells and it worked!” Elise
now held the tome up with both hands. Observing the tome closely, Camilla
immediately recognized what it was. The specific markings on the edges reminded
her of cursed tomes that Leo had mentioned to her.
Not much was know about these tomes, besides the characteristic marks they bore
on their covers. It wasn’t even known if they were real or just myths. What was
known about the books was the dangerous spells that adorned its pages. Spells
that were easy to cast but were extremely dangerous for the user and those who
surrounded them. Panic came over Camilla realized that the girl before her was
in fact her sister.
“Elise what have you done?!” She said, concerned. “The spells that come in
those books are very dangerous. You should change yourself back now!” She
hurried off her bed, the fact that she was in her underwear not mattering
anymore, and walked towards Elise.
Elise on her part was also upset. She thought that Camilla would be happy that
Elise was an adult now. Maybe she’d compliment her on how she was a cool mage
for casting such a spell, or be happy she could do adult things with her new
adult sister. But now it seems she was nagging at her about some danger, and
telling her to change back.
“W-What?” She answered defensively, clutching the book in her arms. “No! I like
this body. Do you know how much I’ve wanted this?”
Getting closer, Camilla realized the magnitude of the situation. She was almost
the same height as Elise, maybe a bit smaller? “Please Elise!” She asked. “That
tome you have holds tremendous power. You don’t understand how to control it.
We need to change you back before something bad happens.”
As Camilla walked closer Elise took a step back, her face flushed in anger.
“No! I’m tired of being a kid and I want to stay this way! Let’s see how you
like it.” With that Elise quickly scoured the book looking for a de-aging
spell, and, after finding the first one that worked, quickly chanted the spell
and pointed towards Camilla. A small ball of greyish light left her fingers and
fired off to its target.
Camilla stood frozen in fear when she saw the ball darting toward her. It
wasn’t fast enough to be unavoidable, but she found herself unable to move her
body for whatever reason. The spell came into contact with Camilla’s chest and
quickly dissipated into the air. For a few seconds nothing happened, which led
to some relief. Relief that was short lived, as Camilla started feeling dizzy.
Elise didn’t wish any harm on her sister of course. The spell had been just to
teach her sister a lesson, maybe make her understand how she felt. So when she
saw Camilla start stumbling, Elise began to worry. She grabbed Camilla’s arm to
support her and lead her to the bed. She sat Camilla down on the bed and sat
beside her, making sure to hold her in case Camilla lost balance.
Camilla felt her head her head swirl as she struggled to keep balance. An
unbearable heat came upon her body, dulling her senses to the outside world,
her body beginning to change. She felt a pulling sensation as her bones began
shrinking, her limbs losing length. Shortly after, a tugging sensation came to
her breasts as they deflated and decreased in size. Slowly but surely, they
shrank until nothing but a flat chest remained.
The most important change was yet to happen however, as a strange heat started
to emanate from her crotch. Her clitoris lengthened slowly, reaching to 1.5
inches in length. When it did, new formed skin began to appear and surround the
entirety of its length. Her labia also began extending, eventually coming
together to form a small pouch. Inside body, her ovaries morphed and changed,
turning into testicles which dropped into the newly formed ball sack. Finally,
a small slit appeared on the top of her clitoris, finalizing the transformation
of her vagina into a penis
Elise grew alarmed due to the lack of response from Camilla. She observed as
Camilla sweat intensely, lost height and bust size, all with a blank look on
her face. She tried to get Camilla’s attention by talking to her or shaking
her, but when all that failed she quickly turned to her book in order to try to
find some spell to prevent or reverse the changes.
Camilla finally woke up from her trance, her transformation having just
finished. Along with her, another member had also woken up, and seemed to be
seeping with arousal after just having been created. Camilla, both aroused and
concerned from the unknown feelings that came from her crotch, looked down to
notice a small prick poking out from under her panties, ready to have some
action.
Camilla wanted to scream, go into a frenzied panic, though the sensations
rising from her new penis left her speechless, as the heat from her
transformation still remained and the dizziness swirled her head around. She
turned to Elise and found that the girl seemed to be taller, or rather she had
gotten smaller. As she looked around the room to admire the change in
perspective, she noticed in amazement how much bigger everything seemed; in
fact, it kind of aroused her.
Now she turned again and really noticed Elise. She admired Elise’s new form,
the voluptuous breasts, the wide hips, the supple ass, it made her salivate.
Staring intently at Elise’s breast, a sudden thirst came over her as she felt
the need to suck on them. Her penis hardened even more as thoughts about
fucking her sister and sucking on her tits began to enter her head. Though she
understood that what she was feeling was wrong, as her arousal kept building
up, she, or rather, he found himself unable to contain his lust any longer.
Elise was surprised at the sudden movement that came from Camilla. While she
searched frantically for a reversal spell that would work, she failed to notice
that Camilla had regained his senses. He pushed Elise down onto the bed with
force and stretched his hand to pull Elise’s bra off. Elise, confused and not
understanding what was happening, tried to push him off.
“C-Camilla! W-W-What are you d-doing?! S-S-STOP!!” She yelled, trying to reason
with him. It was useless though, as only instinct was driving Camilla now.
Camilla successfully pulled his sister’s bra off, revealing the succulent meaty
nipple he had been looking for, and, wasting no time admiring the bare breast,
he lunged towards the nipple, encircling it with in mouth. He sucked the breast
like a wild beast, using his tongue to circle and massage the hardened nipple.
Elise gasped at the flurry of sensations. As Camilla slurped and sucked on
Elise’s nipple, a wave of arousal came over her, new feelings that she had
never experienced began to flood her system. Soon, Elise stopped struggling
against Camilla, arousal running her mind amok. Slowly, another feeling of
pressure began building inside Elise’s breast. An odd warmth that traveled from
its back, and once it released from its nipple, Elise realized what it was.
A blast of milk shot from Elise’s breast into Camilla’s mouth, as he finally
understood why he had been sucking. Camilla immediately blew his load, the
sperm flying straight into his bed, for the feeling of milk in his mouth was
orgasmic. Its taste, texture, consistency, it all made Camilla’s spine tingle.
Drinking his mom’s milk was Camilla’s favorite activity. But Elise wasn’t his
mom… Right?
As the milk flowed from Elise’s teat, she understood what was happening. Her
little son was hungry, so he went to get some of his momma’s milk. Of course,
Elise knew that Camilla wasn’t his son, and that she wasn’t his mother, yet for
some reason those terms felt right. Feeling a spurt of liquid, she looked down
to notice Camilla’s raging erection.
“Poor baby!” She said. “You’re all backed up!” Normally she’d freak out if she
saw that her sister had a penis, but for some reason this felt natural, like
this is the way things were supposed to be. She caressed Camilla’s head as he
drank up much of her milk. Aside from her sexual pleasure, she felt a certain
satisfaction to feeding a young one.
“Now, let’s get to taking care of that little one.”  Elise said, pulling
Camilla off her breast. He became upset, having been removed from his source of
sweet nectar, though Elise quickly reassured him.
“Now now, don’t give me that! We need to take care of your little friend down
there. It’ll be just a minute.” Elise opened her legs to show off her wet
panties, and lead Camilla in-between her legs. She quickly pulled her panties
down, and carefully aiming his peen towards the right hole, she pulled him
towards her as he jumped onto her body, his mouth once again connecting with
her still lactating chest.
“There. Isn’t that better?” Elise asked, caressing his hair. Camilla didn’t
respond. He pumped in and out of her pussy at a quick pace, as the new
sensations that came from his penis were overbearing. Between the sensations of
fucking and drinking his momma’s milk he was in paradise, no longer connected
to the outside world.
Elise on the other hand felt more satisfaction than arousal. She was happy to
be taking care of her child, the feeling of pure bliss on his face gave her
more joy than any kind of sexual act. She continued to caress her son’s hair
caringly, smiling fondly from the sound his pants.
Camilla’s pace quickened as he shot his sperm directly into his mother’s pussy,
the sensations coming from his newly formed penis frying his brain. Gone was
the caring and attractive older sister. Gone was his troubled past and painful
memories. All of Camilla’s memories were rewritten as his past changed. Now he
could only remember being loved and spoiled by his beautiful mother, Elise.
Camilla became drowsy. Having gone through sexual intercourse and
transformation, he fell asleep still inside his mother.
“Aw you poor thing” Elise said, pulling her young one out of her vagina. She
stood up and carried him to bed, laying him to sleep under the covers. Elise
knew that the world had changed after Camilla finished. Looking at pictures
that were around, she noticed that in all of them Camilla was a young lad and
Elise was his loving mother. She still retained her previous memories however.
She knew that not ten minutes ago she was a young girl and he was her older
sister. But now she didn’t feel like changing things back.
She could still find a reversal spell. She could turn Camilla back into a young
woman, and turn herself back into a young lady. Though she could do these
things, she thought of how much Camilla loved drinking her milk and fucking her
pussy. If she were to suddenly change him into a woman it would surely make him
upset. And Elise didn’t want to see his baby upset.
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