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“Chuuup... Haaah... Chuuuyuuup...!”

By the time they realized what was happening, Deneb and Siwoo were already locked in a deep kiss.

With her expression melting in pure bliss, Deneb tugged Siwoo down by the neck, their lips naturally tangled in a hot, needy mess.

Siwoo took in her scent—heady, thick with lust—without hesitation, like nothing in the world could stop him now.

For Deneb, who’d never truly felt it even after having sex with him before, this was the first time it really hit like ‘real sex’, and it made her thoughts go completely hazy.

Both of them, pent up from their half-assed quickies, were lusting after each other frantically.

“Hngh... Uuhhngh...! Mr. Siwoo...!”**

What was surprising, however, was that Deneb, who was rather eccentric but impeccably chaste, and usually busy scolding Siwoo, had made such a suggestion.

And yet, it wasn’t hard to understand.

After a string of failures these past few days, she must’ve been drowning in fear, helplessness, and pure frustration.

Even though she tried not to show it, it was clear—she looked more and more worn out every day.

It was no wonder she turned to the intimacy of skin-to-skin contact as her place of refuge.

-Squelch! Squelch! Squelch!

Her already flimsy clothes were disheveled, and her nipples poked out and rubbed against Siwoo’s chest.

Her marshmallowy pussy was soaked, dripping so much that every time Siwoo thrust in, it squeezed out even more syrupy slickness.

Even the tight little entrance of her cunt kept spilling juice like a leaky faucet.

His little mother-in-law’s thighs clamped tightly around his waist in sync with her climax, and her small, soft, and plush body clung to him as if hanging on for dear life.

“Haaang...! Right there...! There—! No, stop...! Mr. Siwoo, not there anymore...!”

Just when she’d been melting sweetly in his arms, Deneb suddenly started squirming and kicking like she couldn’t take it anymore.

Siwoo wasn’t surprised.

He’d just explored every corner inside her for the first time, and it didn’t take long to find exactly where her weak spot was.

Siwoo’s massive cock was so impressive that it required no special technique.

And now, if he adds the explosive strength of his energy control on top of it—focusing everything into one relentless thrust to attack the weak point...

“Ah... Ah... Ah...!!!”

There was no way Deneb, who was basically still a virgin in experience, could handle that.

Her moans, which had been flowing so beautifully in his ears, suddenly cut off.

Then her insides started pulsing—alive, moving, wrapping around his cock like they were massaging it on purpose.

“Haaaaang...!!!!!”

Deneb convulsed as she reached orgasm in an instant.

But her strength was gone, and all she could do was weakly twitch in his arms. She didn’t even have enough power left to push him away.

Her pussy gripped down on his shaft so tight it felt like it might snap it off.

But inside, it was the exact opposite—her walls stretched just right, molding around his glans like they were made for it. It was a brand-new kind of pussy he’d never felt before.

Most girls got tighter when they came, making it hard to move and even a little painful.

However, Deneb’s pussy was rather submissive, sucking his dick inwards.

She had jokingly called what they were doing ‘mutual masturbation,’ so if he had to describe it now—

It felt like her pussy was morphing into a real-time, custom-fit onahole.

“Haak...! Ang...! Haang...!”

And her voice—those sweet, breathy moans right in his ear—were enough to drive him insane.

The fact that Deneb, who’d spent her whole life singing only for magic, was now moaning out the joy of pure pleasure gave Siwoo a twisted thrill—like he’d totally conquered her.

That rush only made him want to pound that same spot even harder.

His cock didn’t stop for a second, ramming straight into the weak spot that had just made her scream like crazy.

“Kyaaang! Haaang...! Siwoo... t-that spot’s... way too sensitive...! Anywhere else...!”

Deneb flinched and tried to stop him, her eyes wide and panicked, but the strength difference between them was obvious from the start.

Siwoo slammed into her hard, using the full weight of his body, and Deneb just fell apart beneath him like a flower crushed underfootunader root .

-Schluk! Schluk! Schluk

“Ugh! Nngh! Uhh...!”

Deneb whimpered helplessly, her voice shaking in sync with the spasming of her pussy..

Her inner walls clung to his cock like a glove, wrapping around every inch without a single gap.

And right at the entrance, her pussy squeezed tight around his tip, pressing on his urethra like it was saying, Not yet. You’re not cumming yet.

And deep inside, her soft folds trembled and curled like hundreds of slick, tiny tongues, licking and stroking his cock with maddening precision.

“HuaaaAAAANG!!!”

The second orgasm crashed through her, and Deneb tossed her head back, letting out a moan soaked in bliss.

But even then, Siwoo didn’t stop.

Before that orgasm even finished, he was slamming right back into that same spot again.

“Sis...! Sisss...! Haah...! Haaang...!”

Deneb cried out for her sister Albireo in desperation, her voice trembling and raw, like a girl in heat begging for her mommy.

Stacked on two orgasms, her whole body had become even more sensitive. She gave up resisting, letting Siwoo’s cock work her over without a fight.

It was like her body finally understood—there was no running from this. All she could do was surrender.

Tears welled in Deneb’s eyes before streaming down her face in trembling waves of pleasure.

Siwoo grabbed both her arms, pulled his back straight, and started thrusting harder than ever, chasing that third climax like a beast.

“Hiiing... Sissss...! Sisss...! Hiiik! Hiiik...!”

Just like back during the verification test.

That desperate, pitiful way she kept calling out to her sister.

The way her breath hitched and caught between sobs, like she was hiccupping.

And how her moans took on a nasal edge the closer she got to cumming.

-Squirt!

“HaaaAAAAANG!!!”

And then came the third orgasm.

Her pussy clung desperately to his cock as clear fluid sprayed out, dripping down between their bodies.

Deneb’s back arched all the way, like a bow drawn to its limit.

“HaaAAANG!!!!!”

Now was the moment.

Siwoo, ejaculating much earlier than usual, changed his angle and plunged his dick deep into Deneb.

A thick spurt of cum burst from him almost instantly, crashing right against her cervix with brutal force.

-Spurt! Spurt! Spurt!

And after that...

Deneb cried out her sister’s name louder than Siwoo had ever heard from her before.

2.

After their session.

Deneb and Siwoo sat side by side on the bed, their postures awkward, the silence heavy.

The same bed that had been so hot and loud just minutes ago was now drowned in heavy silence.

“Mr. Siwoo.”

“Yes.”

It was Deneb who broke the silence first.

“You... You know why I offered to do that, right?”

“Huh?”

“I was just taking responsibility for what happened. Because of my screw-up, you were about to go jerk off again. And if I just kicked you out after that, wouldn’t that be super rude of me?”

She started saying something... weird..

Her words and this whole situation... it all felt way too familiar. Like déjà vu playing out in real time.

“So yeah... I used you to get myself off. And you used my body to get yourself off. We clear on that?”

“......”

“I mean, god, I can’t believe I have to spell this out. But yeah, that’s what happened. That’s what we did, alright?”

Siwoo didn’t bother chiming in with something like, ‘Isn’t that basically just sex...?’

Because Deneb, who’d been rattling on, suddenly clamped her mouth shut.

She didn’t look like the same woman who used to spit fire with her words like it was nothing.

Even Deneb herself knew what they’d just done.

This time, what they’d done wasn’t something she could cover up with flimsy excuses or mental gymnastics.

“...Guess I was just... tired.”

Siwoo felt a soft bump against his side and looked over—Deneb had her lips slightly pouted and was leaning her head gently on his shoulder.

“I gave you hell for being lewd and shameless, but turns out I’m no better.”

Shame that she’d shown him such a pathetic, weak side of herself,

Angry and disappointed in herself for giving in to raw lust, for crossing a line she should’ve never gone near,

Guilty about the twins,

And despite all that she still felt comfort here, warmth she hadn’t realized she needed.

All those emotions flickered across her face in rapid waves.

“No... I should’ve been more serious about this.”

“I’m the one who ruined it. You were doing your best to hold back, Mr. Siwoo.”

They say you need two hands to clap.

The fact that the sound of their bodies slapping together had echoed in that space meant that Siwoo, too, hadn’t been able to resist her temptation.

That’s why he figured it was fifty-fifty.

But judging from her tone, Deneb seemed to be putting it more like ninety-ten.

“.....”

“.....”

A quiet pause passed before Deneb, still resting her head on his shoulder, spoke softly.

“Do you think we’ll get out of here?”

The question was heavier than it sounded.

The term “bee sex” had made things sound kind of silly, but in truth, this aquarium-like world they were trapped in was clearly enemy territory, completely unknown.

Deneb had been fighting harder than anyone to find a way out, and every effort had ended in failure. No wonder she was tired.

“Of course. You’ve made great progress with your magic already, haven’t you?”

Deneb looked up and locked eyes with him.

Those pretty amethyst eyes, exactly like the twins’.

“Can I ask you for something? Actually... two things.”

“Sure, go ahead.”

“This might sound selfish, but... if we make it out of here, I want to leave everything that happened here behind. No telling my sister. Not even the twins.”

“Um...”

Honestly, if it were just Albireo, Siwoo might’ve agreed without hesitation. But he had planned to tell the twins everything and apologize.

But if Deneb was asking him not to...

Well, it made sense. Under normal circumstances, someone like his little mother-in-law would never have acted like this.

But things had been pushed to such an extreme that no one in her position could’ve made completely rational decisions.

Revealing the truth wasn’t just about his own conscience anymore—it could drag Deneb’s pride and reputation through the mud too. Maybe it really was best to bury it all, like they’d done before with that “verification” mess.

Siwoo thought about it for a second, then nodded.

“Alright. I’ll keep it secret. Forever.”

“Thank you. I appreciate your understanding.”

Deneb let out a breath she’d been holding, her stiff shoulders finally relaxing.

“You said there were two things. What’s the other?”

“Well...”

Deneb hesitated for a moment, then cupped Siwoo’s cheeks in her hands.

And before he could react, she leaned in and softly kissed him.

“That was my first kiss, you know. But it went by so fast, I didn’t even feel anything.”

Deneb, who had finished the kiss as if stamping him with her soft, cushiony lips, said in a mock-coy voice.

“Not as big a deal as I thought, honestly.”

Even as she said it, her face was blushing red, like a ripe persimmon.