"Alright, alright! You want sincerity, right?"
Rias's face burned as she glared at Ryuji.
Though she could easily kill him now—could even reveal her weaknesses to him without fear—her feelings toward him weren't as dismissive as he might assume. To Rias, Ryuji wasn't just some ordinary human.
After all, he had helped her. And at least on the surface, he'd done so without ulterior motives. If he truly wasn't some mastermind but just a regular person, then his honesty alone made him decent by her standards.
She just couldn't afford to take the risk.
Her offer to make him her servant wasn't just about repaying a debt. There were other factors at play.
Ryuji stepped out of the bath barrel with deliberate arrogance, and Rias's blush deepened as her eyes traced his body.
But since they'd already agreed on this method for her to leave this world, she wasn't about to back out now. Steeling herself, she approached and knelt before him, though she didn't bother with much preparation. With the power of this world bolstering him, Ryuji's stamina was nothing short of monstrous.
Her hand trembled slightly as she reached for the dick before her. She parted her lips but hesitated, squeezing her eyes shut.
No matter how much of a devil she was, she was still a girl with no experience in this. If Ryuji were already her servant, the psychological burden wouldn't be so heavy.
But as she wavered, Ryuji's excitement only grew at the sight of her hesitation.
Before she could react, his dick brushed against her trembling, rose-colored lips.
"Mmph?!"
Rias's eyes flew open in surprise. Instinctively, her tongue flicked out to taste where he'd touched her, but there was no strange flavor—just the clean scent of water.
Annoyed, she shot him a glare, but as his penis began to expand before her eyes, she took a deep breath and leaned forward again.
And in an instant—
It became huge after coming in contact with her tongue.
The first thing Ryuji noticed was the heat.
Rias's body temperature was far higher than a human's. Her tongue, unnaturally smooth, moved with a practiced ease no normal person could match.
Her saliva was different too—thicker, stickier, carrying a strange, burning sensation that wasn't unpleasant. If anything, it sent waves of pleasure radiating through him.
As expected of a devil!
But for Rias, the experience was—
"This taste…"
It was odd. Not bad, exactly, but certainly not pleasant. Yet her devilish physiology reacted regardless, sending a thrill of excitement through her.
That's right, she was excited. When she thought she—Rias Gremory, daughter of the Gremory family, fiancée of the Phenex heir, sister of a Demon King—kneeling here, giving blowjob to some random human—sent a perverse thrill through her.
That thrill, that near-betrayal of her status, felt good.
But another aspect of her bloodline immediately alerted her to something else.
'He's gained magic?! He was just a normal human before! And his body's stronger now too? His potential's improved… Is this what he obtained from that other world?'
The Gremory lineage excelled at detecting treasures, after all.
Because her mind was occupied with other things, Rias subconsciously licked the tip of his dick in her mouth with her tongue and continued to suck on it, her small, rhythmic sucks teasing Ryuji with feather-light stimulation.
If it was for a short time, there was nothing wrong with it, but Rias forgot one thing.
Her saliva wasn't just saliva. It carried an intoxicating allure—one amplified by the natural, supernatural charm all high-ranking devils possessed.
And when Ryuji looked down, he didn't just see her flushed cheeks.
He saw the snow-white valley of her cleavage, the inviting swell of her chest—
His restraint shattered.
As Rias's tongue continued to lick, the feather-light teasing became unbearable. Finally, his hand tangled in her crimson hair, gripping tight.
The moment he did, Rias's body adjusted perfectly—devilish instincts and years of aristocratic education guiding her. Her tongue curled, her throat relaxed, her lips sealed—
He barely had time to be surprised before he pressed her head down.
His dick slid effortlessly into a place meant for food, not flesh.
But a devil's anatomy was nothing like a human's. Though Rias gagged slightly, her throat clamped down around him with shocking force—a vacuum-like suction that threatened to pull him apart.
Ryuji instinctively tried to pull back, but Rias's tongue coiled around him, locking him in place.
And the next moment—his cum filled her mouth.
Rias's tongue finally tasted something she did enjoy— the metallic, salty faste made her swallow reflexively before she even realized it.
By the time she came to her senses, she'd already taken in a portion.
Horrified, she yanked herself free, spitting out the mixture of saliva and sticky white cum.
But it was too late. Strands of her crimson hair, her face, even the slopes of her generous chest—all bore traces of Ryuji's cum.
It wasn't just shame that made her cough violently, expelling the remaining fluid.
It was pride.
The pride of a Gremory.
Meanwhile, Ryuji—
Had a crisis.
He clutched his head in disbelief.
I came after just one thrust?! Was it because I've been overdoing it lately… or is Rias just that good?!
"Was I really that fast?! No—it's definitely because you're just too skilled as a devil!"
He refused to admit it might've been all those nights with Chobung dulling his endurance.
Chobung didn't require stamina!
She came pre-equipped with stamina potions!
Rias wiped her mouth, glaring.
"I think it's because you're just weak."
She wasn't entirely upset—the moment he'd grabbed her hair, she'd braced for this outcome. But shoving himself down her throat without warning? Rude!
Sure, she was a pureblood devil, but centuries of intermarriage meant every noble lineage had a bit of succubus blood mixed in.
Not that Rias minded. Succubus traits just meant she could please her future partner better.
Not that she liked Ryuji that way yet. But if she had to do this, she might as well do it well.
So what if she used a few succubus tricks?
"Devil… You really are a devil," Ryuji muttered, eyeing her with grudging admiration.
He did want to go again—Rias's mouth was that good. And those breasts were practically begging to be tested next.
But he'd promised "once," and Lux was still waiting. Keeping her in suspense any longer would be cruel.
Grumbling, he climbed back into the bath barrel.
Rias, meanwhile, rinsed her mouth with practiced ease before fixing him with a serious look.
"The contract's settled. So? Was that enough 'sincerity' for you?" She crossed her arms—or tried to, though the motion mostly just lifted her chest. "The first attempt wasn't perfect, but from now on, as long as it doesn't involve my virginity, you can use any part of me you want. Until we gather enough energy for my return. As long as you don't go too far I won't ask how much energy you gained"
"That's not necessary."
Ryuji checked his energy reserves.
"You gave me a blowjob this time and produced 70 energy points... You didn't put any emotion into it at all."
Ryuji really wanted to complain. Compared with Lux, the energy produced by Rias was really less.
Rias scoffed. "Of course not. You're not my lover. Why would I be excited? Aside from the terrible taste, how is this any different from drinking milk tea through a meat straw?"
Ryuji's eye twitched.
The jab was obvious—another dig at his premature performance.
"...Yeah. No difference at all."
Although she mocked him, Rias's heart raced. The whole experience had left her flustered too. She just didn't want to show it—didn't want to give Ryuji the satisfaction.
"I'll take my leave now. Remember our deal—once you send Lux back, I'll return."
With that, Rias strode off, her hips swaying deliberately.
He watched her go, exhaled sharply, and finished washing up.
Whatever. I'm not the one losing out here.
Later
Freshly cleaned, Ryuji returned to his room.
"Lux, I'm back. Lets—huh?"
He'd expected to find a shy, blushing Lux.
And he did—
Just not in the way he'd imagined.
The black leggings that had once hugged her slender legs were gone.
Now, only bare, creamy skin remained.
Not only that, but her tight-fitting top had also disappeared.
But the most critical detail was—
Beads of moisture clung to her hips, and the path to her vagina glistened with strange droplets.
Ryuji's mind spun in confusion. If he remembered correctly, hadn't he said that using her mouth would be enough?
So then, why—
"M-Mr. Ryuji..."
Lux's face burned crimson, her words stumbling.
"My mouth... can't take anymore. So, please... use the other hole. I trust you, so... so..."
Ryuji's dick immediately stirred to attention.
"Uh, that's really not necessary. I can send you back right now, Lux. Hands or legs would work too—you don't have to go this far..."
Truthfully, he wasn't entirely comfortable with the idea. He'd heard the anatomical facts before—very few women actually found pleasure from behind.
Not to mention the risks: internal tearing, permanent damage, infections, even parasites.
The most important thing is, if you don't clean it properly, it will just become a mess, right?!
"I... I cleaned very thoroughly, Mr. Ryuji. And... I was worried the energy still wouldn't be enough."
Lux reverted to her stammering self, voicing her deepest fear.
After all that effort, what if he still told her the energy was insufficient? Better to take the initiative. If this could satisfy him properly, then so be it.
Ryuji: "..."
With a resigned sigh, he stepped forward. Lux obediently positioned herself, presenting her adorable, white butt to him—the delicate pink lips twitching slightly, droplets of moisture trailing down.
When Ryuji tentatively brushed a finger against that impossibly soft flesh, he discovered—
Lux's lovely pussy had became wet.
~~~~~~~
Bonus chapter every 200 PS.