Serafall spread her arms and legs wide in invitation. Kazuki complied without hesitation and thrust his rod into her vaginal opening.
"Fuu, ugh, nnnn! Ahh, something so hard and hot, inside me... Hnnn, it's going in...!!"
Serafall's body trembled at the sensation of a man she hadn't felt in so long…
'Huh? Was sex always this good? Is it because it's been so long? Or is it?'
Kazuki's massive cock pushed smoothly deeper thanks to how thoroughly wet Serafall's pussy already was, and it soon reached her deepest depths.
"Mmn... You're all the way in... Ahh, it's knocking, thump-thump, right there!"
Serafall let out moans of pleasure she hadn't felt in far too long, clinging to Kazuki, and began rocking her hips in rhythm with his, chasing even greater bliss.
"Ngh, ahh... Nee-san, your pussy—tight at the entrance, squeezing down, but deeper inside it wraps around me so soft... Fuck, it feels incredible!!"
"E-embarrassing! Don't narrate it all out loud!!"
Even Serafall, having her pussy's interior so vividly described, felt mortified and hid her face behind her hands.
'Jeez, Kazu-kun, seriously! But still, I'm glad. Kazu-kun thinks my pussy feels good... Fufu♪ That makes me so happy.'
Knowing that Kazuki liked her tight pussy, joy won out over embarrassment. Serafall smiled tenderly and stroked his cheek with adoration.
"I'm so happy, go ahead... Feel good inside Onee-chan's pussy as much as you want. Shoot it, shoot all your thick cum deep inside Onee-chan's tummy."
At Serafall's words, Kazuki picked up speed and pounded frantically into her pussy. He didn't just slam his hips mindlessly—he varied his thrusts: a few shallow pumps before ramming deep, pounding her depths repeatedly, then shifting his angle to nail her G-spot, fucking her with relentless, calculated variation.
"Ahhn Aaahn Yaaahn Aaahn Amazing, this is amazing… Your cock's hitting every single spot in Onee-chan that feels good!!"
Serafall's cool skin heated up, beads of sweat forming like pearls. Sensing her climax was close, Kazuki entered his final sprint, thrusting in harder and deeper.
"Haaahn, ahn, ahn, aaaahn! I can't, I'm cumming, cumming, gonna—cummingggg!!"
Splurrrrt! Splurt! Spluuuuurt!!
Hot semen flooded into Serafall's spasming pussy as she hit her peak.
'Aha, this is incredible... One shot and my belly's already so full…'
The intermittent flood of cum finally stopped, and Kazuki and Serafall collapsed limply into each other.
Just as Kazuki let out a heated breath—
"Oh no! Get off, Kazu-kun!!"
Suddenly, Serafall desperately tried to shove Kazuki away, her expression frantic.
"What's wrong, Sera-nee?"
"I'll explain later! Just hurry! Hurry, get off of me!!"
Utterly confused but deciding to obey, Kazuki began lifting himself up. But in that instant—
"Ah, no, no! Aaa... N-nooooo—!!"
Serafall's desperate voice transformed into a scream mid-cry. And then—
Pssssssssssshhhhhh—
A golden shower erupted from between her legs, raining down onto Kazuki's stomach.
'Ahh... I've messed up...'
Serafall, having just peed all over Kazuki, felt the color drain from her face in despair as an old, old memory resurfaced in her mind.
She was like this now... but long ago—before she became a Satan—Serafall Sitri had been deeply, profoundly jaded.
In an era when war was the daily norm, the great conflict known as the "Great War" raging between the God of the Bible and the Four Great Satans, commanding armies of angels, devils, and fallen angels alike, she had believed that power—strength—was everything.
Serafall had been a devil through and through, striking down enemies and sometimes even allies, without a second thought.
Given that, she had learned about sex early. In her younger years, she'd taken countless men into her bed, spending her days drowning in carnal pleasure.
Amid those days, she had fallen in love with a certain male devil.
He was the second son of a noble family—earnest, meddlesome, with the temperament of a class president.
Serafall, a delinquent girl, had fought alongside him, his complete opposite, and somewhere along the way, before she knew it, she had fallen for him—a love straight out of some clumsily written shoujo manga.
When they finally confessed their feelings and joined their bodies together, she was enveloped in a euphoria unlike anything she had ever felt from sex before. For the first time, she knew what it meant to be held by someone she loved—how blissful, how incredible it felt.
Perhaps that was why. She had committed an indiscretion she normally never would have. Worse, she had been in the cowgirl position at the time, so when she climaxed, her piss had sprayed all the way onto his face.
The result: he had shoved her aside and bolted for the bathroom, screaming, "That's fucking filthy!"
When he emerged from the bathroom, he didn't say a single word to her. He simply left the room, leaving behind a gaze filled with nothing but disgust and contempt.
From that cold, dismissive attitude, she knew their love was over, and that night, she wept into her pillow alone.
After that, she stopped having sex for fun. She threw herself even deeper into battle, desperate to forget the pain, and before she realized it, she had become known as the "Sitri Ice-Blue Princess," standing shoulder-to-shoulder with that "Silver-Haired Princess of Annihilation" as the strongest young female devil. She had risen to become one of the generals of the Underworld's army.
And then the final decisive battle between God and the Devils occurred.
With the Two Heavenly Dragons crashing the fray, the result was chaos: God and the Four Great Demon Lords alike were obliterated. The Three Factions had all suffered grievous wounds, and the war came to an end.
Serafall learned later that the man she loved had died in that battle.
No more tears flowed.
Even after the war ended, peace did not come upon the Underworld. Having lost the Four Great Satans and nearly half of its High-Class Devils, the Underworld needed new leaders—new Demon Lords.
Those chosen were not of the old Satan bloodlines but young devils selected for their meritorious deeds in the war and their acknowledged strength. Naturally, the old Satan bloodlines would never accept this, and civil war erupted.
As the one who inherited the name of Leviathan and became a new Satan, Serafall too fought at the very front. The old Satan bloodlines—the Old Satan Faction—were driven deep into the furthest reaches of the Underworld, and the civil war ended.
After that, to rebuild the devastated Underworld, she shed her jaded attitude and began to act deliberately bright and cheerful. At first, it was painful, but after hundreds of years, the mask became her true face.
Yet, from that time on, she had neither taken a lover nor kept a mistress, distancing herself completely from sex.
She told herself she was too busy as a Satan, that she had no time—but no, Sirzechs had built a family despite it all, so that was just an excuse. The real reason she hadn't taken a lover or married since becoming a Satan was partly the lack of a suitable partner, but far more than that, it was because that past incident had become a trauma.
If she fell in love and became intimate with someone again, and once more committed that same indiscretion and was hated for it—the very thought terrified her, freezing her into utter inaction. And yet—
'It's hopeless... I've done it again... Kazu-kun is definitely going to hate me!!'
Just as she imagined Kazuki looking at her with that same gaze full of disgust and contempt—
Thrust!!
"Oh-hohhh!?"
He suddenly drove his cock deep inside her creamy pussy, wrenching a bizarre cry from her throat.
"Ka-Kazu-kun!? What are you doing so suddenly—oohhh!!"
'Why!? His cock is even harder than before... gouging into the deepest parts of my belly... Oh no, it's amazing! This is going to make me lose my mind!!'
Kazuki took her hands and lay back, shifting them into the cowgirl position, and then began pistoning up into her from below.
"Hahnn, ahn, ahfuu, ha-ohnn No, if you go this hard, I'll let it out again..."
"Go ahead. Your voice, your squirt, your piss... Let it all out in front of me, Nee-san!"
Check out my new fanfic: Reincarnated into The World of the Irregular at Magic High School
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Advanced 14 chapters with pictures available at: patreon.com/cw/Mike_Kun