Chapter 7. Giving My Little Sister a Butt-Spanking 「Joo Ji-hoon's Perspective」
My little sister leaped onto my bed.
"Oppa, come here."
"What are we gonna do sharing a bed?"
"Roll around together~ Hee-hee."
"I get that we're close siblings, but isn't this a bit too close?"
"This is totally normal for us. If anything, we've been too distant lately—that's the real problem."
"Haa..."
I clutched my head and let out a deep sigh.
"What's wrong? Scared I'll do something naughty?"
Her face was brimming with mischief as she said it.
"Honestly, yeah, a little."
"Oppa, you're making me sad. I'm not that weird."
A-young pouted her lips like she was putting on a protest. I knew she was faking it, but damn, it was cute anyway.
No. Don't give in.
She's my little sister. No matter how cute, it doesn't matter.
"A-young, can you leave me alone for today?"
"Why? Busy?"
"Yeah. Gotta read the diary."
"You can do that later. When's the next chance to play with your adorable little sister?"
"I'll play with you lots after I finish the diary."
"Oppa."
A-young's voice turned icy cold.
"I'm really gonna get upset."
Her golden eyes gleamed with a sharp glint.
Was this how my ancestors felt stumbling upon a tiger in the wild? A chill raced across my skin, goosebumps erupting everywhere.
Scary!! Is that thing really my little sister??
"...What do I have to do?"
"First, come sit here."
A-young patted the bed.
I had no choice but to perch on the edge.
"What, you think I'll bite? Scoot in further."
"Ung..."
I shuffled my butt back toward the center.
The moment I did—
"Hey!"
A-young pounced. More precisely, she flung herself stomach-down across my thighs. It looked like a cat curling up in its owner's lap, but since she was bigger than me, it came off kinda ridiculous.
"A-young? What the hell suddenly?"
"Getting into position."
"Position for what?"
"Butt-spanking position."
"...Butt-spanking? What's that?"
Butt-spanking.
The name alone was terrifying to even ask about. Combining the sound of it with her current pose, I had a pretty good guess what it meant.
Please let my hunch be wrong...
"Oppa, know what the best skinship is for cats?"
It was a random question.
"Never owned a cat, so no idea. Dogs, though—I've had one."
"You're a dog person?"
"Yeah."
"Why?"
"Loyal."
"Hng... Really?"
She didn't seem thrilled with my answer. I couldn't see her face from this angle, but her tone said it all.
Time to steer back on topic.
"So, what's the best skinship for cats?"
"Butt-spanking. Patting their butts."
"Huh? For real?"
"Yeah. Apparently, there's a ton of nerve cells around there."
"Oh... Neat."
Cats always struck me as aloof, but who knew they had such lewd tastes? Acting all prim around strangers, then sticking their butts out for their owner to smack?
They say the prim ones are the wildest deep down. Spot on.
"But what's that got to do with you wanting a butt-spanking?"
"I've got a similar constitution to cats. Because of my skill."
A-young's skill... had to be Beastification. My own creation—a power to transform into a beast-person.
"You transformed right now?"
"Nope."
"Then why say you have a cat constitution?"
"Even after the transformation wears off, it affects my body. Appetite changes, preferences too."
"Oh... Neat."
That explained her weird "nyahaha" laughs too? I'd set the skill myself, but for side characters, I hadn't fleshed out the details. Guess in the real world, the gaps fill themselves in.
"Oppa. You get what I want now, right?"
"I get the what, but... so you came here just to get your ass spanked?"
"Don't say it like that—it's butt-spanking."
"What's the difference..."
My head throbbed; I pressed my forehead. Little sister barges into my room in her undies, demands a spanking out of nowhere. No wonder my head hurt.
What kind of fucked-up family is this?
"A-young, even for siblings, there are lines you don't cross. I get the constitution change, but asking to get your ass smacked? That's a no."
Let's persuade her nicely. We're all reasonable humans with common sense, right?
"We've done it since forever."
"What? Seriously?"
"Yup. Totally serious."
"..."
What the? Am I the psycho? Why the hell would I smack my grown-ass little sister's butt?
If I could meet my past self, I'd grab him by the collar and demand answers.
"A-young. My common sense can't wrap around this, so tell me— was I a siscon?"
"Nah. You loved family a lot, but not that way."
"Then why smack your ass?"
"Not smacked—patted."
"Smack, pat—put the semantics aside. Just tell me this: why the hell did I touch my little sister's ass?"
"I asked you to. Instinctively."
"Even so, touching your grown ass?"
"It started when I was little. Like elementary school age?"
"..."
If I strain my brain, I could maybe justify it. With my past-life memories, she probably just seemed like a kid to me back then.
"Anyway, you get it now, right? Why I want the butt-spanking."
"I get it."
"So you'll do it?"
"No."
"Why?!"
"Whoa, calm down."
I reached for her earlobe, tweaking the soft flesh with my fingers.
No piercing today.
"Eut... What're you doing all of a sudden...?"
"Doesn't this cheer you up?"
"It does, but... how'd you know that's my weak spot..."
"Your weak spot's here? News to me."
I'd known, actually. The diary mentioned she loved earlobe rubs since she was little.
"Oppa. Don't dodge. Why won't you spank me?"
"Told you yesterday. To me, you're a woman now. Not just cute little sis—cute girl."
"What's that got to do with butt-spanking?"
"Doing that kinda thing... might lead to dirty thoughts."
"Hng... So you're a perv? Getting hard over your sister?"
"Lost my memories, can't help it."
"Even without 'em, it's just patting an ass. You pat babies' butts too."
"Babies are babies. You're a full-grown adult."
"So my ass is too hot for you? Even for a virgin, that's lame."
Mockery dripped from her voice.
This brat. If I let it slide, she'll keep teasing.
Time to show her who's boss? Lucky for me, I've got a new weapon equipped.
"Haa... Fine, what do I gotta do?"
Pretending to cave, I went along.
"Just pat-pat."
Chwap. I gave her ass a light smack.
"Like this?"
"Too weak. Again."
Chalssak.
"Weak. Don't just graze—cup it with your palm."
Chalssak!
"Form's good, but too soft."
"Harder than that? It'll be a real smack..."
"Even if you go full force, it won't hurt. You're F-rank in strength and mana, remember? Total scrub."
"...Yeah?"
She kept calling me a scrub. Think I'm easy?
Cheolssak! I swung with everything I had.
Her pale ass flesh jiggled in waves.
"Hyat?!"
A-young jolted.
"You okay?"
"O-oh, just surprised. Been a while. Yeah, like that. Keep going."
"Okay."
Cheolssak! Cheolssak! Cheolssak!
Three in a row. Her firm cheeks clung to my palm each time—addictively good handfeel.
"How's that?"
"Uhhu... You're doing great... Keep it up..."
"Roger."
Cheolssak! Cheolssak! Cheolssak! Cheolssak! Cheolssak!
Five straight this time. Her ass bounced wildly with every strike.
"Huu... Uuuh..."
Face buried in the pillow, she let out muffled groans now and then. Her calves kicked back and forth—was she loving it or hurting?
"A-young, you sure you're fine?"
My palm was starting to sting.
"Huu... Don't just pat... Do other stuff too..."
"Other stuff? Like what?"
"Stroke it... Knead it..."
"Like this?"
I gently stroked her flushed-red ass, kneading the slightly swollen flesh.
"Heeung...♡"
A-young stretched out, exhaling lewdly. Thighs clenching and unclenching, toes curling and uncurling.
Even at a glance, her reaction was anything but normal.
Is this really okay? For siblings?
Hesitating, I paused.
"Keep going... Hurry..."
She urged me desperately.
Her reaction was too good—hard to stop now.
No helping it. I swung again.
Pang! Pang! Pang!
Swollen now, it popped like bursting balloons.
"Nghu... Eut... Uu..."
Face in the pillow, stifling moans.
Did I overdo it? I stopped, stroking up her lower back soothingly.
"Huunyaaa...♡"
She arched her ass higher, thighs quivering.
That's when a sweet-tart orange scent wafted from somewhere.
"Huuu... Oppa knows best..."
"..."
Sorry, but I was rock-hard.
Throb... My 18cm cock strained against my panties, ready to tear through.
It pressed against her lower belly through the fabric, glans kissing skin.
"Ung...?"
A-young tilted her head, glancing down at her stomach.
We're screwed...