Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/12102753.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/M
  Fandom:
      Final_Fantasy_XIII, Hentai_-_Fandom
  Relationship:
      Serah_Farron/Lightning
  Character:
      Male_Lightning_-_Character, Serah_Farron
  Additional Tags:
      Genderbending, Step-Sibling_Incest, Brother/Sister_Incest, step-mother
      and_son_incest, Farroncest_-_Freeform, Cheating, Blow_Jobs, Missionary
      Position, Doggy_Style, sex_at_school, Cowgirl_Position, Threesome_-_F/F/
      M, Foursome_-_F/F/F/M
  Stats:
      Published: 2017-09-15 Words: 1890
****** Loving siblings ******
by AzureDarknessYugi
Summary
     Mayumi is unsatisfied with her boyfriend so she turns to her hot
     step-brother for "help".
Notes
     A rewrite of an H-manga Imouto No Ana by Yukiyanagi. In the original,
     the big brother in it was too forceful on her. And takes advantage of
     her a lot.
See the end of the work for more notes
Mayumi Kimizuka a high school girl with brown hair tied in pigtails and brown
eyes. She has a cute face and sexy body. A deadly combination. She is dating
someone, but right now, her pussy and large breast are being rubbed by her
step-brother. Lightning. Needless to say, a lot of girls are very jealous that
he's her step-brother. Mayumi's hands reached behind her and ran her fingers
through his soft, rose-coloured hair. She shudders by her step-brother's
touches. "Are we doing it again tonight, oni-chan?" Mayumi moaning as Lightning
kissed her neck. She loves feeling his hands on her body.
Lightning chuckled "Of course." he moves his lips to her ear lightly then
whispers softly "Your mine, right?" He moves the fingers a bit, causing her to
cry out in pleasure. Causing her to cum hard.
"YES!" Mayumi shouted in a lustful daze. Lightning gently lays Mayumi on her
bed. Then spreads her pussy. Knowing what she wants, unbuckled his jeans.
Mayumi's mouth watered when her eyes saw his huge cock. Lifting her legs,
Lightning slides his cock slowly in then pump his hips hard and fast. "Onii-
chan! I love you!" she cries out absolute bliss. Mayumi suddenly woke up. "That
dream again." she said to her self. A bit disappointed that it was a dream.
In the morning Mayumi put on a pink shirt with black sleeves, plaid gray skirt
and black stockings. Getting downstairs, saw Lightning sitting on the couch
watching TV with a bored expression on his face. Just seeing him got her hot
and bothered. She slowly made her way to him. Flashbacks of her dreams pop in
her head the more close she got to him. Mayumi sat beside him, snuggling under
Lightning's muscular arm. Pulling his step-sister close to him.
"Onni-chan?" Mayumi asked blushing.
As soon Lightning turns his head Mayumi suddenly kisses him. To Mayumi's
surprise, Lightning didn't seem to mind and kisses right back. His hand moves
to the back of her head and pulls her in for a deep kiss. Lightning's tongue
work was vastly superior to her boyfriend. His kiss left her dizzy and mind
numb. Almost forgot that she locks lips with step-brother. "You know I can hear
you masturbating ever night." Lightning says in between kisses.
Mayumi breaks the kiss and looks way embarrassed "My boyfriend is not good at
sex. We do it a lot but I'm never satisfied."
Lightning turns her head to him and said in a soothing voice that made her melt
"Poor Mayumi, you don't need to do that. You can ask me to help you with that."
"But mom and dad-" Red interrupted her with a finger on her lips.
"Did you forget? They're working late again and Serah is at a friends house for
an all-night study session." Lightning leans in and whispers in her ear "We got
all the whole night to ourselves."
With a nod, Mayumi lays on her back and lifts her skirt. Showing him her wet
panties. Lightning chuckles when he saw this "You masturbate to me, don't you?
When I heard you, you said my name." he said while running his fingers slowly
up and down his step-sister's pussy. Causing Mayumi go become even wetter.
Mayumi nodes. Her eyes told him she wanted more than just his fingers.
Lightning smiles, he unzips his pants then take off Mayumi's panties. Lightning
teased Mayumi a bit by rubbing the head of his cock, before sliding the cock in
her. Mayumi moans loudly as Lightning as his cock slowly enters her. There's no
doubt in her mind that Lightning was much bigger than her boyfriend. She even
came a little.
Lightning rolls Mayumi to on her side. Fucking her sideways. "Your pussy feels
pretty good." Lightning said while thrusting his hip. Mayumi shut her eyes and
let out moans of pleasure. Which was louder than the TV. Her pussy defiantly
liked Lightning's cock better as it clenched on his member. Not wanting to let
go of his amazing cock.
This made her wonder if Lightning fucked other girls. But she did have time to
dwell on that because Lightning turns her around and fuck her from behind. He
grips her hips then raised them a bit "So good." she moans. This position was
not her favorite but since she having sex with Lightning. She changed her mind.
His cock felt really good in this angle.
Lightning lifts her shirt along with her bra then he plays with her nipples.
Mayumi was so lost in pleasure that she began to drool. Lightning keeps fucking
her good but this time he lifts her leg, Mayumi's pussy tightens around his
cock. "My boyfriend is no match for you~" Mayumi moans. She loves how amazing
his cock feels. Even addictive. "I want to see your face as you make love
to me." she asked looking over her shoulder.
Lightning smiles then take off his shirt. "Okay." Lightning said. He turns her
on her back with his cock still inside her.. Mayumi's pussy tightens when
seeing his bare muscular chest. When he leans in, Mayumi's hands instantly went
to his chest. He thrust his hips again, faster and with more strength. Turning
his step-sisters moans into screams of pleasure. "I'm going to cum!" Lightning
grunted.
Mayumi hooks her legs around his hips, wanting her sexy step-brother to release
his seed deep inside. Already she forgot what sex was like with her boyfriend.
Or even she was having sex with her step-brother. Because she climaxes again
and again. It felt like she had one long orgasm. Leaving her mind blank and her
head dizzy. It Lightning's turn to cum. Filling Mayumi's pussy to the brim with
his cum. "I can no longer have sex with anyone else." she said with a daze with
her tongue hanging out, eyes blank with lust, and her blush with a dark red.
Lightning repositions himself so Mayumi was on top of him. "Hey Mayumi, let do
this every day."
"Okay." she said before pulling Lightning's cock out and sucked him off.
In the following morning, Mayumi wants to suck his dick, but Lightning didn't
as they going to be late for school. But he promises he'll fuck her good after
school was done. So she suppressed her urges. Easier said than done as the
train they went on had very little room. Mayumi was pressed up against
Lightning.
She can feel his muscular arm under the sleeve of the sleeve of his jacket.
Being this close to him reminds Mayumi of Lightning's warm, hard, large cock.
After the amazing sex, they had last night left her wanting more. Her lewd
thoughts caused her to become very wet. "Maybe this will help you." Lightning
whispered softly in her ear.
Making her shiver. One of Lightning's hands went under panties and slid in her
pussy. While the other went under her bra and rubbed her harden nipple. Mayumi
pressed lips into a fine line, trying not to moan so loud. But it was difficult
because she felt a surge of pleasure wash over her body. Lightning knew how to
please a girl so well. His skilled fingers quickly brought Mayumi to cum.
"Our stop is coming up." Lightning whispered in her ear again. Mayumi was
annoyed at this because she was now super horny. Maybe her time at school will
help Mayumi with her desire to fuck Lightning.
It didn't as she had a hard time focusing on her first two classes because all
she can think about is Lightning. Mayumi really wants his cock. Her mouth wants
it. Her pussy wants it. Even her ass want it, but she doesn't think she's ready
for anal just yet. The thought of Lightning fucking her ass is something she
wants him to do, but not just yet.
When lunchtime arrived, began her search for her step-brother. She came across
her boyfriend. "Have you seen my oni-chan?" she asked him before he can great
him. A thought of his cock came to mind, but quickly decide not to. He cannot
satisfy her. Only Lightning can.
"I saw him at the rooftop talking with Serah-chan." as soon he said that made a
mad dash to there. He was going ask Mayumi something else but she was already
going. "Did something happened to make them so close?" he wondered out load he
then continued on his way, not wanting to get in the way of family bonding.
Before she opened the door to the roof, encountered Serah was about to leave
"Hello~" Serah said going past her. Mayumi wondered why her step-sister is in a
rush and found the way she walked a bit odd, but she can dwell in it later.
Right now, she wants Lightning to fuck her. She can't take it anymore.
Once she's on the roof saw Lightning sitting by a high fence sleeping. His arms
were folded and had one knee up. Mayumi quickly went to him opens his fly, then
her finger went into his boxers and pulled out his cock. Even tho not fully
erect, Lightning was still so big. Mayumi began to lick every inch of his cock.
Then took it in her mouth.
She can feel Lightning growing in her mouth. Even heard some sleepily groans
from him. She did find it odd she can taste cum from his cock. "I did came a
lot on it. Maybe that's way." she thought but push that aside when Lightning
was now fully hard. And lust began to cloud her mind. Mayumi tried to take all
of his cock in, but can't just yet.
So she rubs the rest with her fingers. Her pussy began to throb with the desire
for Lightning's cock, took off her panties. She took his cock out her mouth got
up and turns around then Mayumi sat on his cock. "Finally, his cock is
penetrating me!" she moans while cumming. Her hips began to move on their own.
Suddenly she felt a pair of strong hands grab her breasts. When she turned her
head, saw Lightning with a knowing smile.
"I knew you'll do this." he said now thrusting his hips. Giving Mayumi a lot of
pleasure. She held his wrist to keep his hands on her breasts.
"I love it~" she moans with a smile "I love your cock! It's so big! I can't get
enough of it!" Mayumi did care if she's being too loud. Because she was lost in
ecstasy. Her head turned when she felt a kiss on her cheek. With no hesitation,
locked lips with Lightning. "Not only he's great at sex, oni-chan is a great
kisser too~" She thought lustfully. Mayumi let Lightning's tongue dominate
hers. She wants to tell Lightning to cum inside her again, but she did want to
stop kissing him.
Luck for her, Lightning knew what's on her mind and fried a huge load right
into her womb. Mayumi moans into Lightning's mouth. When they broke the kiss, a
string of saliva connected their lips. "Are you going to get that?" Lightning
motion to Mayumi's cell that fell out of pocket. On it was a text from her
boyfriend. Asking if she wants to go out after school.
She texted back saying "Sorry, but I want to spend time with my oni-chan."
End Notes
     The chapters in the manga were kind of short, so I combined the first
     two chapters together. I may add characters for other hentai.
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