Rias and Akeno moaned in unison as pleasure surged through them from both above and below.
"Ah… Akeno…"
"Rias… Nn—"
Before they realized it, the two had succumbed to the twisted atmosphere, their lips meeting in a heated kiss…
"Akeno… Nn, slurp—!"
"Aahn, Rias… Mmm, slurpp— hmm~"
Before long, their kiss grew fiercer, tongues tangling, saliva mixing—until—
""FUAAAAAHHHNNN~~!?""
A sudden, overwhelming shock ripped through them, forcing another cry from their throats.
"Seriously! You two really think you can just ignore me and have all the fun yourselves?"
""HYIIIIIIIIIINNNN~~!!""
Kazuki Fuwa, who had been left out until now, thrust a finger deep into Rias' tight asshole while simultaneously driving himself upward into Akeno's devilish cunt with a rough, punishing stroke.
SPLAAAAAASH!!
The two writhed instantly, their bodies convulsing as they squirted uncontrollably. But Kazuki showed no mercy, only speeding up the movements of his hips and fingers.
"Ahh! Ah! Nngh! Aahn! W-Wait… Kazuki, please— waiiiiiiiit!!"
"Aah! Ooh! S-Sorry, sorry, Kazuki… P-Please forgive us— AAAAAHHH!!"
"No, I won't forgive you."
""HAAAAAOOOOOHHHHHHHHH~~!!?""
Kazuki only intensified his movements.
He plunged his fingers into both of Rias' holes, stretching and pistoning them ruthlessly. Rias clenched around him like a vice, her juices gushing like a geyser as she drenched his hand.
Meanwhile, he hammered deep into Akeno's core, his cock battering her cervix relentlessly.
Akeno's inner walls convulsed around him, her body trembling from the unfamiliar pleasure of her p-spot being ravaged, her nectar dripping in euphoric surrender.
Kazuki, drunk on the sensations they gave him, hurtled toward his climax.
"Ooh! Ahh! So good! Both my pussy and ass feel amazing— AAAAAHHH~~!!"
"Aahn! Y-Yes! It's so deep… so biiiig!! Nngh, hitting me— hitting my deepest spot~~!!"
"Tch… Rias, Akeno… I'm cumming!"
"Ahh! Me too— I'm gonna cum again…!"
"AAAAH! Do it, Kazuki! Fill me— fill Akeno's pussy with all your cum— AAAAAHHH!!"
Rias and Akeno clutched each other's hands, their massive breasts rubbing together as they braced for the final moment.
Kazuki bit down hard on Rias' swollen clit while slamming into Akeno's depths—burying his dick to the hilt as he erupted inside her womb, his thick, molten seed flooding her cervix in violent spurts.
SPURT! SPURT! SPLUUURT—!!
SPLURT!! SPURT! SPURT! SPLUUURT—!!
""AAAAAHH! C-CUM— CUMMIIIINGGG~~~!!!""
Rias' hips jerked wildly as the stimulation to her clit sent her crashing into another orgasm, her juices splattering everywhere.
And Akeno—her uterus stuffed full of Kazuki's searing thick cum—could only shudder violently before collapsing into the abyss of pleasure, her consciousness fading away…
...
Sometime after summer vacation began…
Kazuki and the rest of the Gremory household—along with Azazel—gathered at the station nearest Kuoh Academy.
Since formal wear was required, everyone was dressed in the school's uniforms. From there, they were guided through a demon-exclusive route to a hidden platform.
The train waiting for them would take them straight to the Underworld.
The ride itself was smooth and comfortable.
With Rias in the lead car and Kazuki's group in the center, the train advanced through a dark passage. According to Akeno, who sat beside him, this train was designed to cross dimensional barriers to reach the Underworld.
At first, Kazuki wondered why they didn't just use the usual magic circles for teleportation. But as it turned out, he, Issei, Asia, Xenovia, and the other newly contracted servants had to enter through official channels and complete the proper procedures—otherwise, they'd be considered illegal immigrants.
Before long, Rias returned with a male attendant dressed in a conductor's uniform. Each time he waved a handheld device over the new recruits, it emitted a cheerful ping! Like a correct quiz answer. With that, their paperwork was complete, and they were officially cleared for entry.
About an hour into the journey, the scenery outside shifted dramatically.
Aside from the violet sky, the landscape—rolling mountains, lush forests, and serene lakes—was strikingly similar to the human world, almost picturesque.
Rias explained that they were now passing through Gremory territory. Issei, Asia, and the others, whether visiting for the first time or returning after a long absence, chattered excitedly at the sight.
Amid the commotion, however, Koneko remained silent, staring blankly at the passing scenery.
Her quiet demeanor wasn't unusual, but Kazuki couldn't shake the feeling of a dark shadow looming over her.
'I'm sure that in the original story, hardships will soon befall her, but what will happen next, and what should I do?'
Soon, the train would arrive at its destination: the Gremory Mansion.
——
———
The moment they stepped off the train, Kazuki and his group were greeted with overwhelming enthusiasm. Under Grayfia's guidance, they arrived at the Gremory family's main residence—a grand, unmistakably European-style castle.
Before they could even process the sheer scale of the place, they were introduced to Rias' nephew, Millicas, and her mother, Venelana, exchanging polite greetings.
Millicas was an intelligent-looking red-haired boy of about ten years old. As the son of Sirzechs and Grayfia, he was undeniably destined for greatness, already carrying the charm of a future heartthrob.
Venelana, on the other hand, bore a striking resemblance to Rias—a flaxen-haired woman who could easily pass for a beautiful girl of eighteen or nineteen.
Standing beside Rias, they looked more like sisters, to the point where Grayfia somehow appeared older than Venelana.
Apparently, high-ranking devils could freely alter their appearance with magic as they aged—was this form her husband's preference, perhaps? And true to being Rias' mother, her breasts were massive. Issei had been leering so shamelessly that Asia had pinched him in protest.
That night, after dinner, Kazuki and Rias were summoned by Rias' father, Lord Zeoticus.
Led into a stately room, they found Zeoticus and Venelana already waiting, with Grayfia standing silently behind them. As Kazuki and Rias took their seats on the opposite sofa, Zeoticus began speaking.
"Now, the reason I called you both here is simple—it concerns your engagement."
"Father, Kazuki has already proven himself more than enough!" Rias protested immediately.
"Hear me out, Rias," Zeoticus replied calmly.
"It's true that Kazuki has defeated formidable foes—the fallen angel general Kokabiel, the Leviathan descendant Katerea, and even the White Dragon Emperor Vali Lucifer. His achievements are beyond reproach."
"Then—!"
"His strength is undeniable. But what of his knowledge?"
'Knowledge, huh…' Kazuki grimaced internally.
He was lacking in noble demon customs. Ever since his rebirth as a devil, he'd been thrown into one brutal battle after another, hardly any time to study. But that excuse wouldn't fly here.
"That's—! Kazuki's only been a devil for three months! It's natural he wouldn't know everything yet!" Rias argued.
"'Natural'?" Venelana's voice cut in, icy.
"Rias, you are the heir to House Gremory. Do you truly believe your future husband can afford to remain ignorant?"
"Ugh…" Rias faltered under her mother's glare. The sheer pressure was terrifying—no wonder she was Rias' mother. But if Rias stayed silent, this discussion would go nowhere.
Reluctantly, Kazuki Fuwa raised his hand...
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