Disquiet at the Millennium Lamia's Lair
Eli was swept up in an inexplicable sense of unease upon arriving at the cave the innkeeper succubus had mentioned.

"...My personal pussy... is gone...?"
Like a boy with orange hair who had trusted in his friend's victory, Eli turned around with a shocked expression. Her gaze fell on the mansion beyond the dense forest, where Kairan and the others were resting. She flapped her mouth open and shut a few times amid the strange unease, then shook her head vigorously to pull herself together.
Come to think of it, she hadn't seen any other futanari in that village. So rather than her "beloved's exclusive lover pussy" being invaded, it was more likely Kairan had just borrowed it for some novel stimulation.
"Bobbing, nah. A little fellatio's no big deal..."
She might get jealous if it were getting pounded by another futanari's cock, but she wasn't petty enough to get jealous over a blowjob.
"Next time, maybe have Nia and Karni do it for her."
Nia seemed half-conquered by Nairah already, but if she threw Nairah in too, the three of them could just have some lesbian fun. That was the perk of humanoid living onaholes, after all.
"Man, she really has lived for a thousand years, huh. This overwhelming demonic aura. It's giving me chills."
Eli took a deep breath and stepped into the cave. She pulled an item from her inventory.
"Sharp Semi-Auto Otherworld Judge..."
Of course, that was just a nickname. It was a set of dozens of blueprints handed down by a hero from the past—weapons they hadn't been able to produce back then due to lacking technology. But times had changed, and with the Holy Kingdom officially joining the war, weapon development had resumed.
"A revolver, right."
Six bullets loaded into the cylinder. Slower to reload and lower capacity than a semi-auto pistol, but fewer malfunctions. Not for internal defense but for frontline action, she preferred the reliable revolver with its superior per-shot power. The ammo was anti-demon holy armor-piercing rounds, utilizing the clash between holy power and magic.
"Hmm. Nah, stash it for now."
Better to have it ready even if her attacks didn't work.
"Alright. Let's go."
Eli pressed on, illuminating the cave with a small orb of holy power. A chill wind brushed her skin, carrying an oppressive pressure. No killing intent or anything like that—just a natural aura leaking out unintentionally.
Maybe even stronger than the Four Heavenly Kings.
It was different from the refined, polished killing intent of Rahatrik she'd briefly sensed from afar. This was raw, primal energy.
Might have to crack open the safe...
At the end of the cave, she emerged into a vast cavern. A massive chamber with its own self-sustaining ecosystem. And at its center was the lamia.
Human upper body, serpentine lower. Purple skin gleaming with scales, her long snake tongue flicking out. Her golden eyes took in Eli at a glance.
"So you're the saintess Harian mentioned."
"Harian...?"
"The innkeeper. That succubus with the alluring red skin."
"Ah..."
Eli nodded cautiously and approached the lamia.
"Protected by holy power, I see. And hiding something besides."
Her large eyes gleamed, filled with Eli's form, piercing like they could read her soul. Eli swallowed hard.
"Stockpiling holy power? An abnormal amount."
"You can even see that...?"
"The title of Millennium Lamia is no empty name."
The lamia stretched out her tail, patting the spot beside her.
"Sit. I want to see that seed you've brought."
Eli approached carefully and sat by the lamia's tail. The scales were softer than expected. As she touched the glossy surface, the lamia leaned her torso closer, examining Eli.
"I am called Belia."
"P-Please call me Eli."
"Hehe. Very well, Eli. Now, show me that seed."
Belia smiled seductively. That relaxed, alluring smile made Eli gulp inwardly. In this situation that could make her hard any second, Eli pulled out the seed and showed it.
"Ooooh. This is... Bellamorta's..."
"You know Bella?"
"Of course. She's the reason I formed an alliance with the succubus village. So I was quite shocked to learn she'd died."
"S-Sorry..."
"Hm? No. Not at all."
As Eli apologized tentatively, Belia shook her head.
"If anything, I'm grateful. Truly thankful for freeing that child from eternity."
Belia spoke with a faintly wistful expression.
"Bellamorta and I were born different. She was a goddess, progenitor of succubi. I was the great chieftain of lamia."
Belia reminisced about the distant past.
"We were too strong. We couldn't mingle with our own kind. When we tried, all we got was fear and worship. No true friendship."
"..."
"That loneliness stretched on for countless ages. And finally, my friend was freed from it."
"I..."
"Ah, but that doesn't mean I want you to kill me."
Belia's eyes sparkled as she spoke.
"I'm curious about the future you and your lover will shape."
With an enchanting smile, Belia chatted idly with Eli for a bit before sharing info on the divine tree. Normal divine trees grew on holy power—faith. But Eli's was a seed left by Succubus Queen Bellamorta. Even if she'd once been a goddess, it clashed with holy power. As the innkeeper said, it needed powerful desire, longing... and a touch of yin energy.
"Hmm. Experiencing it once wouldn't hurt."
"Pardon?"
"Just amplifying your desire, that's all."
Belia said, touching Eli's chin with a finger. A whirring sound rang out, purple light swirling.

And a small change came over Eli's body.
"Mm... stronger than I thought, perhaps...?"
"..."
"E-Eli? Why are you looking at me like that...?"
After Belia's "enhancement," Eli's cock sprang up instantly. At its ferocious yet beautiful sight, Belia blushed and stared. Eli gazed at Belia with slightly dazed eyes.
"E-Eli?"
"Lady Belia. You're to my taste. For real."
"Wh-What?"
Eli slowly approached, grabbing Belia's arms.
"L-Let go...!"
"Just pull free, right?"
"N-Nngh!"
Her arms pinned by Eli. Simple as Eli said, but... for some reason, no strength came. No matter how she struggled, Eli didn't budge.
"...Ahaha. Lady Belia... you're weaker than I thought?"
"Hic."
Eli smiled with lustful allure and pounced on Belia. In the vast cavern, pitiful moans echoed.
⁎ ⁎ ⁎
"H-Hnnngh♥ N-Nooo, stooop♥♥"
"Haaah, f-fuuuck♥ S-Snake puuussy, so gooood♥"
"H-Hiiik♥ O-Oooh♥"

The twisting pussy squeezed her cock like it was alive. Eli shook her hips with all her might. Slightly below Kairan's but nearly as pleasurable. Something 2% lacking, yet still top-tier.
"Ah, hnnngh♥ Goood, so gooood♥"
"H-Hoooh♥ Hii, oooh♥"
"Ahh. Wanna make you my onahole. My personal onahole...!"
Eli buried her face in Belia's massive body, thrusting like a beast. The desires she'd held back exploded under Belia's power.
"Kairan'd love this too, right? Such a huge onahole. Aaah, how many cocks could this pussy fit?"
"G-Gonna break...♥"
"No way. Let your brain melt and die♥"
Eli grinned wide. Belia was huge, but her pussy was tight. Incredibly tight. Virgin? But with that size, once tamed, she and Kairan could share it. One in the ass, no—both in the pussy. Suck her tits, crush her womb, fill it to bursting. After who-knows-how-many loads, when Belia's belly swelled with cum, Eli pulled out with a satisfied look.
"I'll come back when the journey's over. Train that pussy till then. Got it?"
"...Y-Yes♥"
Mixing casual and polite speech, Eli said. Belia shifted slyly, licking Eli's cum-and-juice-soaked cock with her long tongue in response. Her fist-wide gaped pussy leaked cum steadily, breasts marked with deep kiss bruises and bite marks. Eli blushed at her handiwork but felt no regret—only satisfaction.
"Kairan'd scold me for this... Or maybe getting done like this would feel good too...♥"
Finally deep-throating Belia one last time, Eli returned to the village with a refreshed body.