It's Common Sense for Little Sisters to Swallow Their Big Brother's Cum...
“......What?”
I gaped at my stepsister's shocking statement. It hit me so hard my brain flatlined for a second.
"What did you just say?"
"Shoot it in my mouth. I'll slurp up your cock-juice so damn good."
Slap slap slap slap!!
Unlike her nonchalant tone, her hand gripped my dick and jerked it without mercy.
"Urk......"
I panicked at her spouting such bullshit like it was the most obvious thing in the world. Sure, I'd already crossed the sibling line by giving in to temptation, but cumming straight into her mouth? That was a whole other beast.
But my cock was already at its breaking point. Spotting that, Chae Na-hee curled her lips into a smirk and ramped up the speed of her strokes.
Her bratty grin and the way she milked my dick like she was squeezing every last drop had me teetering on the edge of explosion.
Shlick shlick shlick!!
"Eut! Hey, ease up a bit......"
"Ease up? Your cock's drooling precum like crazy 'cause it feels so fucking good."
"Hey. Your mouth with your big bro is just......"
Even if common sense had flipped, her personality sure hadn't. Her snappy tone was pure Chae Na-hee, same as always.
"Ugh. Look at that dick twitching."
Such crude talk from a fresh-faced girl. I wanted to straighten out her total lack of respect for her big bro, but right then her hand started pistoning up and down at full speed.
Squelch squelch squelch—
The friction from her soft palm and slick spit blasted pleasure through me, turning my vision white in an instant. It was leagues beyond solo jerking—I clutched the bedsheets and arched my back.
"Hey. Chae Na-hee. Shake it gentler...!!"
"Quit yapping and cum already."
Slap slap slap slap!!
"......Urk."
Sensations overwhelmed my brain. Her hot breath. Her long black hair swaying. The thick scent of her spit vibrating through the room.
'Damn, her hands are insanely soft though...'
Never really noticed amid our constant bickering, but girl hands were something else—super soft and pale. Lotion game strong? Her lashes were long too, skin flawless, no blemishes.
"Ugh. Crazy... look at that cum leaking."
Of course, that pissy tone was vintage Chae Na-hee.
"Ptoo!"
She hawked another glob of spit onto my dick. One hand kneaded my balls like dough, the other flew up and down the shaft. Her thick saliva clung to my glans, stretching in sticky strings with lewd squelches. The visuals alone were killer.
"You can really cum?"
"Yeah. Blast every drop of cock-juice from your nuts. I'll swallow it all."
"Eut......"
Was this really okay? Blood or not, we'd lived together over seventeen years—I saw Chae Na-hee as my real little sister.
But staring at her jerking my cock, pleasure short-circuited any rational thought.
I couldn't hold out anymore. Vision whitening, hot cum bubbling up from my balls.
I looked at her. "Hey, Chae Na-hee. I'm getting close...!!"
"Yeah. Cum! Hurry...!"
My cock twitched like it was about to blow, and she shoved her face right up to it, eyes wide open, staring intently.
"Cum in my mouth-pussy! Shoot your cock-juice!!"
Slap slap slap slap!!
Her hand went into overdrive. My vision flashed pure white.
"Ah——"
She gaped her mouth wide enough to see down her throat, eyes bugging out like this was prime cum territory. Her tongue lolled out invitingly, eyes gleaming with greedy hunger.
Her stroking hand blurred even faster.
"Grk...! Cumming...!!"
Already on the brink, her turbo handjob obliterated me. Brain-melting pleasure—I lost it and erupted.
All-night pent-up load exploded out, my lower body shuddering. Any wank I'd ever had felt like kid stuff now.
-Spurt..., spurt....
Cum blasted from my glans into her wide-open mouth, painting her neat teeth and palate white.
Even mid-orgasm, she kept pumping my spit-drenched dick, waves of ecstasy crashing nonstop.
It finally tapered off after a ridiculous volume.
But no respite. Suddenly, Chae Na-hee chomped down on my cock, sucking my glans into her sticky, scorching mouth.
"Mmm. Slurp.Smooch, slurp..."
She wasn't kidding about not wasting a drop. Eyes rolled back, she vacuumed the tip like a straw.
Pleasure like my soul was getting drained. Vision whited out again.
"Urk...!!"
How long? She finally popped off. Like her cum-guzzling frenzy never happened, she swallowed the remnants, then hacked.
"Ugh. *Cough*! Throat's clogged.... You unloaded buckets."
"...You told me to."
"Who said? Good boy."
Her praise. Curt as ever, but her face screamed satisfaction.
I swallowed hard. "Hey, you good?"
"Huh?"
"Swallowing my cum—no big deal?"
She tilted her head. "What's wrong with eating big bro's cum?"
"...Forget it."
Was sibling handstuff and gulping normal here now? Adaptation would take time.
"Anyway, I'm out. Mom's got breakfast ready—clean up and come eat."
"Uh, uh......"
"If you need to squeeze more cock-juice, holler."
She bounced without a backward glance.
Left alone, I was rooted for a while.
......I'd cum. In my stepsister's mouth.
Head down, staring at my dick slathered in sticky saliva. Hers. A weird, lewd scent wafted off the glistening mess.
She'd spat tons on it, so soaked was expected... but unwashen, it'd reek. Bolted to the bathroom.
Shhhhaaa—
"Haa...,"
Hot water cascaded, but her soft hands' insane pleasure looped in my head.
'...Am I a shit big bro?'
Crazy bastard. Couldn't hold it, blasted in sis's mouth?
Crushing guilt hit.
Bigger problem though: '...Won't be able to say no next time.'
If this twisted world stuck, and she came at me lewd again, instinct screamed I'd fold.
Knew it was wrong, but chance given? I'd pounce like a dog in heat.
......Wait, wasn't this normal now? How resist?
"Haa...... Fuck if I know."
No-sibling-sex was my old gospel, flipped overnight.
Stick to old rules? No one'd get it.
Moral agonizing here? Just self-inflicted headache.
"At least the rest seems normal......"
Small mercy. Total overhaul? Unadaptable.
From events so far, this warped common sense targeted sex only.
Sting...!
"Ah, fuck...."
Shampoo in my eye. Nothing went right.
......
Showered off, threw on clothes, headed out.
Kitchen: Stepmom in apron rolling eggs, Chae Na-hee fiddling with her phone at the table.
Picture-perfect domestic bliss.
"Son~ Come eat."
Gurgle—'Skipped dinner yesterday too.'
Morning nut on empty stomach? Starving.
Sat down; she set a rice bowl before me.
"Eat up. More if you want~."
"Yes, Mom. Digging in."
Called her Mom naturally, but truth: not bio. Remarriage fam.
Post-divorce, Dad wed her, boom—Chae Na-hee stepsis acquired.
'Awkward as hell at first.'
Kid me raged no new mom needed, ignored her, even bullied.
But she treated me like blood, her sincerity won me over. Family now.
Admirable woman: raised non-blood son flawlessly, epitome of motherhood.
Three years back, Dad's sudden accident left her my sole guardian.
'...Weird if we weren't tight now.'
23 this year. Remarriage at 6—lifelong barring fuzzy toddler memories.
Respected her steel post-Dad, no complaints.
Near-bio mom, precious. Hence, extra dread for more weirdness.
And dread materialized.
"Son. Na-hee drained your cock-juice this morning?"
Her usual warm, loving voice. Content? Night and day.
"Y-Yes?"
Shocked, I dropped my spoon.