Sister Yearning to Submit to Her Little Brother (3)
How many hours had passed? Seo-yoon stared blankly at her monitor screen.
"Wow."
A short exclamation burst from her lips. She scrolled the mouse wheel up and down the page. It was the report she'd just finished writing. But she couldn't believe the end result staring back at her. No missing data, no flaws she could spot herself. I did all this? In just a few hours?
This wasn't her usual planning work—it was a task assigned in today's meeting. It required poring over massive amounts of data. Constant back-and-forth emails with the team. Endless internet searches.
But this was the countryside. The satellite internet crapped out every day. A single click took dozens of seconds to load a page. She was forcing herself through a field she barely knew. She had never once finished on time. Nearly every day meant overtime bordering on all-nighters. She'd barely catch a few hours of sleep at 2 or 3 a.m.
But today was different.
"It's all done."
Seo-yoon marveled again. There were still 15 minutes left until quitting time. And yet she'd perfectly completed every task assigned for the day. She'd just sent the final compiled materials to the team leader.
Not long after, the email notification chimed.
Seo-yoon's eyes widened as she read the reply. The team leader always gave sharp, cutting feedback. This was as close to high praise as it got.
"Haa."
She cupped her face in both hands. The suffocating pressure eased at last. Tears welled up unexpectedly. The weight of being the eldest. The loneliness of country life. Every pent-up emotion crashed over her at once. Her nose stung. Just as tears threatened to spill down her cheeks—
Suddenly, a few sheets of white tissue appeared in her field of vision.
"Huh?"
She turned her head. Siwoo was standing right next to her desk before she knew it, holding out the tissues with an indifferent expression.
"Why are you crying."
His voice was flat. Seo-yoon panicked. She didn't want her little brother seeing her like this. She snatched the tissues and snapped back.
"What are you talking about? Something got in my eye."
"What got in your eye to make you cry like a baby."
"I'm not crying. It's dust. Shut up and get out."
The words slipped out. Her usual sharp tone had escaped unbidden. Oh crap, Seo-yoon thought. What if he actually left? She spun around and yelled at him.
"Hey! Catch that bug that went behind the wardrobe before you go!"
Siwoo halted. He turned back with a look of exasperation.
"You just told me to get out."
"Catch the bug first, then get out."
"But it hasn't come out after five hours of waiting. Probably dead already."
Seo-yoon clicked her tongue.
"Then stay until dinner at least."
"...Fine."
Siwoo trudged back to the bed and flopped down. She glared at him curtly on the surface, but inside, Seo-yoon let out a quiet sigh of relief.

Seo-yoon glanced back at her monitor. But her gaze lingered there only superficially—her mind was entirely on her brother rolling around on the bed behind her. She wanted to tell him to stay right by her side all night, for days even. For some reason, Siwoo's presence put her at ease and gave her strength.
But saying that outright would just earn her a "What the hell?"
Yeah. Being near him calms me down, makes things feel right. It's not like I'd die without him.
24/7 was unrealistic. She gave up on that. Seo-yoon tried to console herself.
Find a decent excuse. At least get him to come into my room while I'm working.
With her resolve firm, she pretended to focus on the monitor while stealing glances at Siwoo. He was just staring at his smartphone. He didn't seem inclined to leave until the bug showed or dinner time hit. She couldn't have been more relieved.
The conversation died. The only sound in the room was the low hum of the PC tower. It wasn't awkward or uncomfortable. This silence was the ultimate rest for Seo-yoon.
How much time passed? Rustle.
A small noise shattered the quiet. Seo-yoon's eyes darted to the base of the wardrobe. That damn bug she'd hoped never to see again was crawling out.
Siwoo heard it too and looked over, frowning.
"...Fucking hell."
Seo-yoon recoiled, shoving her chair back.
"Kill it quick! What are you staring at?!"
She stomped her feet. Siwoo grabbed a pack of tissues from the desk and yanked out a thick handful. He balled them up and advanced on the bug.
Squish.
No mercy. The thick wad crushed it flat.
"Got it."
Siwoo picked up the mangled bundle. Seo-yoon's face twisted in disgust.
"Why are you showing me that?! Throw it out! Flush it down the toilet!"
"Got it. Stop yelling."
Siwoo headed out with the bundle. And Seo-yoon regretted it instantly. The moment he stepped out, her chest tightened again. She couldn't even wait for the toilet flush—she slipped out after him.
"You flushed it properly?"
She asked Siwoo, who was shaking water off his hands from the bathroom.
"Yeah. Like it's gonna crawl back up."
"Don't say creepy shit like that!"
Seo-yoon yelled, but there was no real irritation or annoyance in her expression or voice. Just then, Mom's familiar voice called from the kitchen.
"Kids, dinner time."
The aroma of doenjang jjigae wafted warmly from the kitchen. Side dishes were neatly arranged on the table. Seo-yoon pulled out a chair and sat. Since the move, these dinners always started with a sigh of frustration. But not tonight.
Seo-yoon declared it: This was the most comfortable, warmest dinner since they'd dragged themselves to this godforsaken countryside.
*
Moonlight filtered through the window as I shifted in bed, reaching out to the side. Sticky, soft skin met my hand. The bed was a bit narrow for two, but Mom—Chae-eun—was asleep beside me. My kneading her breast woke her with a smile.
"Oh my, son. Already?"
Fucked senseless all night, yet she rolled over, rubbing her cheek against my arm. She nipped my shoulder lightly and looked up. Her eyes brimmed with blind devotion to her son.
I slid my hand from her breast down to her lower belly, pressing lightly. Glorp—pffft—A gush of cum from the night's loads leaked out with a lewd squelch.
"Haaah...♥ Son...♥ Don't press Mommy's womb like it's a toy like that♥"
"Why not?"
"Because... Mommy'll go into heat again and turn into a total bitch in heat...♥"
Chae-eun reached between her legs, scooped up the flowing cum, and licked it off her fingers. Just the tongue's touch made her lips part, drool spilling as she moaned.
"Haa...♥ My baby boy...♥"
"Mom, aren't you being too slutty?"
"Mmm... It's more like you're just too amazing, Siwoo♥"
I sat up, and Chae-eun knelt on the bed like she'd been waiting, ass up. Her massive tits sagged heavily against the sheets, defying gravity no more. I folded my leg and slipped it under her breasts. They pressed against my skin, nipples brushing my thigh. She smiled slyly at the sight.
"You like Mommy's tits that much?"
"Yeah."
"Hehe♥ Then..."
She gathered her breasts in her hands, squeezing them around my leg like a massage.
"How's that? Feels good? Hngh♥"
While she did, she straddled my leg, grinding her pussy against my shin.
"Rubbing my pussy on your shin feels so goooood...♥"
"Stop hogging all the pleasure, Mom."
I yanked the covers off completely. Grabbed her nape and pulled her head between my legs. My rock-hard cock rubbed her cheek. Her eyes glazed over again.
"Ah, son's cock...♥ Slurp, schlop... shluuuurp...♥"
Days of practice paying off—she now engulfed my dick with expert skill. A far cry from the awkward licking just days ago. I chuckled softly and pressed her nape firmly.
The sight of Mom on her knees sucking cock was always a spectacle. Gluck—gluck—sluuuurp—The room filled with vulgar slurps and her heated breaths.
Stroking her nape with one hand, I said,
"Seo-yoon noona seemed better today, right?"
Chae-eun paused mid-suck. Big sister's name out of nowhere? She hadn't expected that. Family or not, bringing up another woman stung a bit. But as a mom, she couldn't exactly get jealous. I'm the only bitch for my son. With that thought, she forced a casual air.
"Mmm... slurp—schlop—♥ Yeah... she looked more relaxed... Did you do something, son?"
"Yeah, helped her out a bit. She's been stressed and snappy these past few days, wearing me down. Won't happen anymore."
"Aha. Our boy's so sweet... Then, like with noona... could you help Mommy too?♥"
Chae-eun wiggled her ass, letting out a nasal whine—her signal she wanted it now.
"Got it. On all fours."
She pulled off with a pop, strings of spit dangling to her collarbone. I slammed straight into her twitching pussy.
Squelch! Shluuuck—
"Hyaaahhh♥ It's in! Son's cock... hitting my womb entrance♥"
My dick scraped her walls roughly, pounding her cervix. She was on the edge in moments.
"Nghooo... Huh?"
Suddenly, it stopped just shy of tapping her womb. Confused, Chae-eun twisted back.
"S-Son?"
"What?"
I smirked slyly, rocking my hips sloooowly.
Scriiitch—
"Mmm..."
She moaned, dropping her head. It felt good, but nowhere near the brain-melting climax she'd tasted seconds ago—teasingly mild.
A light tap on her cervix, then pulling back. The pace was agonizingly insufficient for her current state. Finally, she whimpered desperately.
"Hngh... hnn... Son... harder, please..."
"Harder pounding?"
"Y-Yes..."
"Alright then, Mom."
I asked in a low voice,
"Can I make Seo-yoon noona like you too?"