Breeding My Obsessive Big Sis
"...Why isn't she coming?"
It was already past 10 p.m., with the sun long set and darkness blanketing the city, but...
She'd acted like she was definitely coming to my room tonight, so had she suddenly changed her mind? My big sis still hadn't shown up.
Plus, I wasn't sure if it was because I'd hit the gym hard for the first time in a while, but my body felt extra drained today.
...Partly because I'd gone at it with Mom, too.
Anyway, right now, I was extremely sleepy.
Just as my eyelids started drooping, someone gave a soft knock on my door.
-knock knock
I knew it was sis without looking, so I just told her to come in.
"Door's open—come on in."
No sooner had I spoken than the door creaked open, and the silhouette of the person standing there came into view.
"...!"
I had no idea where she'd gotten it, but sis was wearing sheer lingerie, her cheeks flushed as she gazed at me intently.
"Hehe♡"
My heart skipped a beat at her faint, seductive smile.
"Sis..."
I called out to her, and she closed the distance in one step, plopping down right beside me on the bed and pressing herself against me.
-squeeze
As she leaned into me and hugged my arm, the soft, squishy sensation transmitted straight through.
"Minhyuk... Did you have fun today?"
"F-fun...? What do you mean?"
"Hmph...♡ Why play dumb when you know?"
Before I knew it, her hand had slipped under my shirt, groping my abs and chest.
"Haa...♡ If you're gonna be this oblivious... I guess I'll just have to take the lead?"
I glanced down, and sure enough, my precious cock was straining hard against my underwear, ready to burst through.
"Oh my♡ At least your body's honest."
"Th-this is..."
"No need to hesitate."
With that, she pushed me back onto the bed and straddled me.
"Ngh..."
"Minhyuk... See, sis wants it—even more than what you did with Mom today... even more than with Yuna together. But there's one condition."
"C-condition?"
Here she was, suddenly laying out terms and negotiating like some kind of deal.
She lowered herself fully, pressing her chest against mine.
"Get me pregnant."
"P-pregnant?!"
Her bombshell declaration shocked me, but she didn't waver even a little.
If anything, she looked dead serious.
"Yeah, you know it too, right? Sis is getting to the age where she'll have to do artificial insemination soon. But... I don't want some stranger's semen. If possible, I want it from someone I know well—the one I love most in the world, you, Minhyuk..."
She trailed off, shifting her body back so our crotches touched through our underwear.
"Diiirectly. Impregnate me♡"
"...Just get you pregnant?"
"Yeah... and..."
Her serious expression twisted into something utterly feral, like a bitch in heat.
"It's a danger day today, so creampie me♡"
I'd heard girls beg guys not to cum inside on dangerous days before, but this was the first time I'd ever heard one demand it.
"Hoo... Fine, got it."
"Really...?"
"Yeah. But I've got a condition too. You said just getting pregnant is enough? Cool. Then until you're properly knocked up, I'm gonna pound you mercilessly. No mercy if it hurts, no holding back—I'll ravage you. That okay?"
"Th-then..."
For a split second, Yuri sis seemed to hesitate.
-drip
But her body was as honest as mine. Love juices leaked through her panties, soaking my lower abs.
"Ehehehit♡ Heeheeheehee♡"
I calmly stripped off my clothes while she let out that broken, weird laugh nonstop.
Then I peeled off hers too, leaving us both naked.
This time, I flipped the script—laid her down and got into missionary.
"M-Minhyuk♡ Minhyukaaa♡"
Yuri sis reached out with both arms, trying to pull me in.
Her vacant, crazed eyes stared at me as she chanted my name—it was a little creepy, but I ignored it and aimed my cock at her pussy.
The moment my glans touched her labia...
-squish♡
"Ooh♡ M-M-Miiinhyuuuk♡ Hiiik♡"
Her hips shot up off the bed, squirting her juices all over my chest.
"...At this rate, we won't even get penetration all night. Hold it together a bit, sis."
"Hnguuut♡ I-I'll t-try♡"
Her body was so sensitive that just grabbing her waist made her tremble.
"This time for real—going in."
"O-okay... Put it in...!"
-thrust!
I drove in hard, feeling her hymen tear as my cock slammed straight to the back, crushing her womb.
"Kkuuuuh♡ Uhaat♡ Uuuuwaaah♡"
Her breathing turned ragged from the sudden pain, body going rigid.
I stayed buried inside, waiting for her to adjust to the deflowering agony.
'It hurts...! Hurts hurts hurts... Hurts...? But it feels good? Good? Good... goooood♡ Minhyuk? Minhyuk♡ Ehehehit♡'
The glorious moment when Minhyuk and I finally became one.
I was savoring every second with my whole body.
He seemed to be waiting for me to get used to the pain, but honestly, the pain had vanished ages ago.
This ragged breathing? Definitely from pleasure, not pain.
'Otherwise, why would my body feel like it's floating in the sky?♡'
It felt just like when I'd squirted and climaxed earlier.
Similar, but way more intense.
Like my body was impaled on a red-hot iron rod—but instead of staying still, it started writhing on its own.
And Minhyuk must've read the signals from my body, realizing I was fine, because he began moving his hips slowly in sync.
-squish squish squish
Slow, but enough to feel every texture of each other's sexes clearly.
He poked around inside my pussy from every angle, and my body reacted wildly each time.
Once he'd zeroed in on my weak spots, he locked in the position and ramped up the piston speed.
-squishsquishsquish
Our pubic bones slapped together, her pussy juices splattering everywhere.
Of course, he kept precisely tapping my G-spot on the way out, so juices kept leaking from the gaps around his cock.
"Ughook♡ Oook♡"
I'd already hit light climaxes multiple times before he'd even cum.
Then, the moment I let my guard down, he slammed in deep with full force.
-smack
A dull thud echoed as my womb got crushed again.
"Uoooooguk♡"
That thrust made me climax hard once more.
After that, just like he'd warned, he grabbed my waist mercilessly and started pounding away wildly.
-smacksmacksmacksmacksmack
"Uk♡ Guu♡ Guh maa♡ Maaan♡ Stooop♡"
My body was shaking uncontrollably now—it wasn't exciting anymore; it was starting to scare me.
I really felt like he might break me.
Minhyuk was fucking me like a madman, dead set on impregnating me.
'Th-this... isn't it... no it's not... but it is♡ Feels too good♡ Womb kisses♡ I'm dying from how good it is♡'
And in that moment of distraction, he unloaded, filling me to the brim.
-gurgle guuuurgle
My lower belly swelled slightly, a warm, cozy sensation flooding my whole body.
But it didn't last.
-tingle tingle
"Hiiiik♡ W-wommmmbb♡"
My womb contracted and relaxed, expanding a bit.
And then... it happened.
'P-pregnant♡ Success♡'
My body had instinctively accepted the semen and ovulated on the spot.
"Hnguu♡ Minhyuk... Thaaank yooou?!"
Before I could even finish thanking him, he readjusted, folding my body like origami and slamming down from above again.
-squishsquishsquishsquish
"W-waaait♡ Hnguuut♡ J-just cuuuumed♡"
"Shut up! Get pregnant already! You shameless bitch!"
This piledriver position, dropping straight down.
'At this rate... the fertilized egg might get pounded out before it implants...?'
That would be a disaster, so I tried to stop him, but my body wouldn't obey.
"Ughok♡ Ooook♡"
All I could do was stick out my tongue and take the ruthless pussy-rape.
Soon after, fresh semen poured into my pussy.
My womb was so full now that my lower belly felt heavy.
-pop♡
His cock pulled out with a cork-pop sound, and semen started backflowing.
-spluuurt
"Th-this... so much...♡"
But it wasn't over.
"Kyaaah?! M-Minhyuk...? S-stop now... Hyaaak?!"
This time, he propped me against the headboard for doggy style.
I barely turned my head to check the clock.
Not even midnight yet.
And Minhyuk's runaway train of a fuck session showed no signs of stopping.
I wanted to tap out, but he clearly didn't.
This night was gonna be looong.
•The Next Morning•
"Hnguuu... Hic♡ Hweee..."
Completely broken, I was sprawled face-down on the bed.
Minhyuk had ravaged me all night in every position imaginable, hell-bent on knocking me up.
And at some point during that frenzy, my body had forcibly adapted to his.
My pussy now remembered every vein on his cock like a mold.
'Ugh... It huuurts so bad... Can't even move...'
I twitched, turning my head to glance at the clock—it was nearly 10 a.m.
"Hweee...?"
In this state, I couldn't do shit, so I just went limp, passed out face-down on Minhyuk's bed.
"Snooort... Haa..."
I buried my face in his blanket, inhaling and exhaling deeply—his scent teasing my nose.
-creak
Right then, the bathroom door swung open, and Minhyuk emerged, towel-drying his hair.
"Oh, you're up, sis."
"Ngh... M-Minhyuk..."
Inside, I prayed he hadn't seen what I'd done, reaching out for help.
He smirked at me.
"Heh... Need a hand?"
His damp hair and rotten grin only amplified his decadent charm, making my heart race again.
Of course, I still wanted to own him.
Still wanted to spend forever with him.
But there was one problem.
His insane libido and stamina.
If he only had one or the other, it'd be manageable—but both? Handling him solo might straight-up kill me.
I loved him enough to take it all, but survival came first.
-thud
"Ah..."
He scooped me up effortlessly and headed to the shower. On the way, I remembered the "meeting" promise with Mom and Yuna while he'd been hospitalized.
-"Minhyuk's libido is... extremely high. Probably too much for any of us alone. So Yuri, you might think you can handle him solo, but it won't be easy."
-"No way! Minhyuk is mine alone... I'll have him all to myself..."
-"Fine, then. We'll give you a shot solo. If you can handle it, okay—we won't touch him again."
-"Mom!"
-"It's fine, Yuna. Anyway, if you can't... we share him then. Deal?"
-"Hmph! I can handle Minhyuk's lust! Watch me—I'll monopolize him!"
-"Hehe, good luck~"
'R-right... that happened...'
As the shower's gentle spray washed over me under Minhyuk's hands, I inwardly lamented—but it was done.
"Sis, think you're pregnant?"
"After you dumped all that inside? No way I'm not..."
"True enough."
"Then..."
I reached out, cupping his cheek lightly.
"You confident you'll be a good daddy to our kid?"
"Daddy... huh."
He seemed deep in thought.
Makes sense—fatherhood was a massive responsibility men rarely faced, unlike women.
And his answer to my question?
-smack♡
"Of course."