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1.

“D-Deneb…?”

“Haah… Hnng… Ugh… Mm….”

Albireo flinched at Deneb’s hips sudden movements.

Even though the things between Siwoo and Deneb had calmed down a little, Albireo hadn’t been too concerned about it.

Or rather, she naively assumed that this wouldn’t turn into anything ‘disgracing’.

Why?

Because as far as Albireo knew, in sexual acts, women wouldn’t easily reach orgasm.

Statistically, many women hid their dissatisfaction and rarely experienced orgasms during intercourse.

Now, for the uncaring Deneb…

To feel pleasure from the anus, which required constant stimulation…

On the first experience, no less.

It was an almost unimaginable scenario.

Thus, Albireo had believed tonight’s experiment would remain strictly clinical. Seeing how Deneb and Siwoo struggled awkwardly to proceed with penetration, her assumptions felt more certain.

But…

“Hngh… Ah… W-Wait! H-Hold on…!”

Deneb, who gracefully stretched out her slender waist, as if dancing, while being caressed by Siwoo…

Just moments ago, Deneb hadn’t reacted to Siwoo’s touches, but now it was different.

Her face flushed, her eyes moist, her breathing trembled, her hair had turned dishevelled, and her trembling lips were filled with embarrassment.

Even Albireo, her twin, had never seen such a sensual expression on her face before.

And all this happened because of merely oral stimulation on a hole that wasn’t supposed to be treated in that way,

“Does it feel uncomfortable?”

Albireo turned her gaze to Siwoo again.

He didn’t seem surprised by Deneb’s reaction, as if he had already expected this.

“W-Where are you putting your tongue?! That’s disgusting! It’s filthy!”

That was a lie.

Deneb wasn’t some naive maiden; she was a witch who had lived for centuries.

Someone like her no longer had the ‘awareness’ of such a thing. In fact, they barely even remembered what a bathroom looked like.

Of course, being on the receiving end of such stimulation on that hole might bring up other thoughts, but Albireo could tell Deneb was just rambling in embarrassment.

“Filthy? But you’re a witch. Surely, it’s not a big deal.”

“No! It’s not dirty! It’s just…! Weird!”

Denying Siwoo’s words would be the equivalent of admitting that her rear hole was dirty. This left her in a dilemma.

“E-Enough, just do it already! This isn’t what we’re trying to do today anyway, right?!”

Clearly flustered, Deneb fidgeted and avoided looking at Siwoo, her eyes darting forward instead.

She couldn’t bring herself to meet his gaze.

Now, there was no denying it anymore.

Siwoo’s stimulation had been incredibly effective, enough to make Deneb ‘feel it’.

So much so that Deneb was trying her hardest to hide it.

Albireo couldn’t even fathom what kind of sensations or processes had led to this, her face mirrored the stunned disbelief of someone watching a cosmic horror movie.

“…Put it in.”

“Understood.”

Siwoo nodded calmly and stepped behind Deneb.

His thick, unyielding shaft, glistening with both precum and oil, was positioned against Deneb’s slick entrance.

Albireo, who had always considered ‘anal sex’ physically impossible, now was seeing firsthand how it was unfolding.

-Schlick!

The bulging, battering-ram-like head of Siwoo’s cock pressed firmly against her wet, trembling bud.

As the pressure of his thrust overtook the tight resistance, her soft cheeks parted, gradually swallowing him inch by inch.

“Nghhh! Ah… ngh…!”

Her entrance stretched slowly, giving the illusion that it was licking the crown of his cock clean before greedily taking him deeper.

Once his shaft passed halfway, her tight walls sucked him in with a lewd, slurping grip.

Deneb’s trembling ass tightened, pressing snugly against both sides of Siwoo’s cock.

It was as if it was putting up one last futile resistance.

“Are you okay?”

Siwoo paused, thinking that he should let her rest for a moment.

Though foreplay had loosened her up, it still wasn’t enough.

Unlike the twins’, whose smaller bodies could adjust quickly with foreplay, Deneb’s anus was particularly stubborn.

Still, her unbearable tightness and the way her heat clung to his cock proved that the same thing indeed ran in the family.

“Haa…ha… I-I’m fine…”

One needed energy to stay angry, and since she didn’t have enough of it, her anger had gone away somewhere.

As if dazed, Deneb gave a weak nod.

While waiting for her resistance to subside, Siwoo savored the rough texture of her folds with his bare skin—this was possible because they didn’t use a condom.

The first penetration was 80% of the challenge of anal sex.

From then on, any movement coming from his hips would bring them both pleasure.

Though he had been hesitant at first, Siwoo’s heart was now pounding with excitement.

Who knows if it was her intoxicating scent, or her unexpected sexiness that drove him forward.

“I’m going a little deeper now.”

“W-Wait, just— Ahhh!”

Siwoo gently grabbed Deneb’s soft hips.

Is it because I’ve only ever seen her acting all composed and dignified?

Siwoo had always assumed she had a large frame.

But, when his hand gripped her waist, he found out that she was far more delicate than he had expected.

Her soft, feminine skin radiated warmth and charm that no man could ever yearn for.

Deneb, the proud Countess Gemini, was still, at her core, just a woman.

“Ah… Ah… Ngh…”

At first, Deneb flailed her arms in protest, but soon her resistance faded. Instead, she used her hands to cover her mouth and suppress her moans.

Siwoo pushed deeper inside her, feeling the welcoming embrace of her slick, sticky inner walls clinging tightly to his cock.

It was hot.

And tight.

Beyond the entrance, her slick, smooth folds gripped his bare cock, twitching and squeezing as they wrapped around him.

-Squelch! Squelch!

“Ugh… Aaah… Hnghh…!”

He thrusted his waist into her as her moan accompanied him like a sob.

Her delicate, sweet little hole had already swallowed him halfway, twitching slightly, as if offering a teasing, intermittent massage.

Just a little deeper.

Deeper.

Her elegant spine, smooth like carved ivory, trembled with a delicate shiver.

Eventually, his massive cock disappeared into her body completely.

“Ah… Kuuuh… Kkkuh…”

All Deneb could do was gasp with her mouth wide open and eyes rolling back, as she took his cock slamming deep into her secret place.

She didn’t even have the presence of mind to protest as Siwoo gripped her hips without asking, treating her like nothing more than an object.

After giving Deneb enough time to adjust, Siwoo began to move in earnest.

-Schlock!

His cock, entangled with her folds as though they were one, slowly pulled out.

Her tight entrance clung stubbornly, almost refusing to let go. At the same time, she let out a crude, obscene moan through her ragged breathing.

“Hiik…!”

For a woman, anal sex often gave a more intense pleasure during the pulling rather than pushing.

But, Deneb had no way of knowing that, so she was completely unprepared against the incoming pleasure.

“N-No…! Nghh…! Uuuh…!”

When he thrusted back in after pulling out halfway, Deneb’s smooth thighs quivered with sharp spasms.

Her insides, once resisting firmly, had now become soft and yielding.

Soft on the outside, moist on the inside, that was the current state of her juicy ass.

Sensing she was ready, Siwoo finally spoke.

“I’ll start moving now.”

2.

-Schlick! Schlick! Schlick! Schlick!

The sound of wet flesh sliding against flesh played out in slow rhythm.

“Ahh! Haah…! Hngh…! Hrrngh…! Kuh…”

Filling the pauses were her short, broken whimpers.

Siwoo, who had disarmed Deneb piece by piece like dismantling a puzzle, began teasing her with abandon.

Relishing her trembling figure, he savored both the tight resistance of her entrance and its soft, welcoming insides.

The guilt he felt at first began to fade, and soon he even forgot that Albireo was there, watching them.

Men who had never cheated existed.

But, even if one were to take them here, make them thrust his dick into the rear hole of the city’s most stunning beauty, would they even say no?

Deneb’s body was as intoxicating and addictive as a drug.

-Schlorp! Schlorp! Schlorp!

As he was about to pick up the pace with his thrusts,

“W-Wait, wait! Hnnng…! Just a second!”

Deneb reached behind her, stopping Siwoo’s movement with her hand.

How did things develop this way?!

This is supposed to be nothing more than an annoying experiment!

The idea of exposing her most private place to another man already felt humiliating to begin with, but she hadn’t anticipated it would be such a grueling experience.

At first, all she felt was pain and resistance.

But as the foreplay intensified and the rhythm of the thrusts took over, Deneb began to feel a spark of betrayal within her own body.

A spark that flickered and popped before turning into a blazing fire that consumed her.

“P-Pull it out!”

“Huh?”

“Pull it out, now!”

At that moment…

Deneb instinctively felt a rush of panic.

A primal fear towards what might happen if the object that was violating her from behind continued its assault.

-Schlllop!

Through repeated penetration of his cock, she felt a sense of ‘unity’ with it.

As his massive length dragged along her walls, Deneb trembled, overwhelmed by the mix of sweet relief and a stinging ache in her back hole.

Siwoo withdrew, shaking free from Deneb’s insides that clung to him as if unwilling to let go.

Deneb, who had been standing upright with her legs spread wide, now trembled as her knees pressed together, barely supporting her weight.

Between her round, enticing buttocks, her quivering pink flesh—once spread wide open—now slowly closed in a lewd display.

Biologically, a woman’s anus and genitals are closer together than a man’s.

Deneb’s swollen, glistening pussy folds were fully visible, barely shielded by her soaked panties, clinging to her and ready to drip if squeezed.

“I-I’ll lie down…. Standing like this is too hard for me.”

“If you say so.”

“Deneb, are you okay?”

Albireo swallowed hard, watching her younger sister with concern.

“I’m fine.”

Deneb tried to respond calmly, but she didn’t know.

How her half-lidded, tear-glossed eyes and flushed cheeks looked so shamelessly aroused.

And with that expression…

“Oh, and Mr. Siwoo… Remember… Don’t grab my waist like some kind of handle!”

The way she scolded him, oblivious to how her words only added to the erotic tension, was maddeningly arousing.

With that, round two began, with a change in position.

***

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