Toothbrushing with My Little Sister!
I watched her arousing backside disappear down the hall, then sprayed deodorizer across the stained sheets of my bed and tossed the blanket into the laundry basket.
Even so, the room still carried that sharp, fishy stench mixed with the ammonia tang of urine. But strongest of all was the thick, sweet scent of my own night-blooming pheromones.
I pulled a bottle of water from the fridge and drank deeply, replenishing the fluids I’d lost during that earlier marathon of sex.
That was when my adorable little sister stepped out of her room and fixed her gaze on me.
“Oppa… I… can you help me with something…”
“Hm? What’s wrong?”
A flicker of unease stirred inside me. I didn’t want to cross any lines with my sweet little sister.
“Well… while I was gaming earlier… I hurt my arm…”
She couldn’t quite get the words out, but I already knew what she meant.
My sister played a lot of online games. Whenever she got angry, she had a habit of slamming her fist on the desk. Looked like she’d done it again.
“My hand hurts too much to brush my teeth properly… Could you help me…? Please?”
Her injury didn’t look that serious, but it was clear she just wanted to act spoiled. The Pheromone seemed to have intensified her clingy, whiny side.
This is fine. I get to see more of my cute little sister’s aegyo.
Luckily, it didn’t seem like things would spiral into anything worse.
I truly wanted to cherish Ayeon as a real sibling. I had no choice with my older sister—her behavior had been too infuriating—but doing anything inappropriate with my precious little sister would be pure insanity.
I decided to grant her innocent request with a kind heart and absolutely no ulterior motives. Really.
“Alright, come to the bathroom with me.”
“Hehe! Okay~!”
She waited with her mouth already open, her expression strangely excited.
This was dangerous. My once purely adorable little sister looked oddly erotic today. Maybe it was because too many things had happened. Her face had flushed a deep pink.
She’d always been pretty, so of course she looked sexy. That had to be it. Ayeon wasn’t a woman—she was my cute little sister. I absolutely could not react.
Clenching my patience tight, I began brushing the teeth of my sister, who wore an inexplicably lewd expression.
Ayeon’s lips were so small. Even stretched wide, her tiny mouth was adorable. She seemed to be opening it as far as she possibly could.
I rubbed her teeth with the toothbrush. Each neat, pearly tooth was tiny and charming. Her tongue was a vivid pink. It looked like it would taste of strawberries if I kissed her.
I moved slowly, brushing her teeth while taking in the sight of her small face and delicate frame. Skin white as jade, petite ears, a button nose, and those clear, innocent eyes.
Just brushing the teeth wasn’t enough to remove the smell. I meticulously cleaned every crevice, also scrubbing her tongue.
Her tongue kept dodging the toothbrush like it was playing a game.
I wondered how deep the toothbrush could reach into her small throat. Seeing cute little Ayeon made me suddenly want to tease her.
Before I knew it, I was slowly sliding the toothbrush back and forth inside her throat.
“Uuu… uuk.”
The moment it touched the back of her throat, Ayeon gagged.
Watching her struggle only made me want to torment her a little more. I poked at the insides of her cheeks with the toothbrush, testing how far it would go, how much I could stretch them.
Then I let the toothbrush slip from my fingers.
I wanted to put my hand inside her mouth instead.
Gulp…
My heart trembled with nervous excitement as I swallowed. The sound seemed too loud in the quiet bathroom.
This was wrong. Ayeon was the sister I cherished most. She was only twenty, my sweet little sister. I thought of her as my real sibling.
Still, I touched her soft, cherry-like lips.
It would be okay to slip my hand into Ayeon’s mouth, right?
She kept her mouth obediently open, showing no resistance at all.
I ran my fingers over her neat teeth, then stretched the sticky saliva between them until it formed thin, glistening strands. Next I rubbed the soft inner lining of her cheek and pressed outward until my finger bulged against the outside of her cheek.
At some point Ayeon’s face had turned beet red. Tears welled in her eyes and began to fall.
She stayed completely silent, offering no reaction. That meant it was okay, right? She must have given permission. Touching her was fine. Everything was fine.
Even as guilt and the thrill of taboo twisted inside me, my fingers moved toward her luscious tongue.
Feeling my intrusion, her tongue shrank back, trying to hide. I pressed it down, lifted it, rubbed it from every angle.
How deep was that small, round, adorable throat of hers?
If I pushed my finger into that hole, what sounds would Ayeon make? What expression would she show?
If she weren’t my sister, maybe I could have put other things inside her…
No. I couldn’t think like that.
My patience finally snapped. Greed surged up, roaring to cross the line that must never be crossed.
In the end, I let reason go.
That small, damp, greedy hole nestled inside her cute strawberry mouth—I thrust my finger into it.
Please just stay still. I want to do this a little longer.
I want to watch you suffer just a little more. I want to torment you just a little more.
I shoved my finger deep into her throat and stirred wildly.
Saliva began to leak from the corners of her mouth. The skin around her lips glistened with the mess I’d made.
The angle was awkward. I grabbed a handful of her soft hair and tilted her head back, forcing my hand even deeper.
One finger became two, two became three, three became four—I crammed them in by force.
Saliva poured from her mouth now. Clear tears streamed from her eyes.
She stared straight at me with those sad eyes. Were they eyes of resentment?
Her small hand pushed weakly at me. The strength was pathetic.
I kept moving, gathering my fingers tightly and driving them as far as they would go.
Her tiny throat convulsed with another gag.
Grab!
She clutched my wrist.
Tears already flowed freely, but now it looked like she was about to break completely.
I barely caught the fraying thread of my sanity and yanked my hand free.
Thump. Thump.
My crying sister’s face was flushed crimson. My chest ached so badly it felt like it would burst.
What the hell had I just done to my small, fragile little sister?
To me, both Mother and Ayeon were irreplaceable family.
I felt disgusted with myself. What had I done to her?
She looked at me. Please don’t look at me with those heartbroken eyes.
Please don’t say anything. Just pretend it never happened.
Time stretched between us. After a long silence, I spoke first.
“Sorry.”
“……”
She said nothing.
She had every right to be angry. I must have disappointed her terribly. The brother she had trusted completely had betrayed her.
Even if she resented me, I had no defense.
“No… it’s okay…”
She said it was okay.
I had done something unforgivable. We were never supposed to cross that line.
Yet this angel-like girl forgave me without hesitation, even after I had tormented her with such filthy lust.
“Rinse the rest for me…”
“…Yeah.”
I filled a cup with water, poured it into her mouth, and watched as she swished and spat. We repeated the process again and again.
The sound of her gargling echoed softly in the bathroom.
I was losing my mind. Was the Pheromone affecting me too? No, the description said it only worked on females. But I could still feel it.
It seemed the Pure Body had done something to me. I could sense a change taking root in my mind.
Aaaaaah… this shouldn’t be happening…
I really was a crazy bastard.
I gulped down the remaining water, rinsed my own mouth first, then slipped my fingers between Ayeon’s lips to pry them open.
Pressing my mouth to hers, I let the water flow from me into her.
Once her mouth was full, I pushed my tongue inside.
Her tongue lay stiff and tense, barely moving.
I rubbed it roughly, aggressively. The way her rigid body twitched was unbearably cute.
I kept violently scrubbing her small, helpless tongue until the tension finally melted. Her tongue began to respond, shyly tangling with mine.
They twisted and slid together, sending ticklish sparks through both of us.
Soon the water had mostly spilled out, leaving only saliva.
I fed her my own, refusing to separate our lips, sealing her mouth with mine so she couldn’t breathe.
Gulp…! Gulp…!
Little by little, she swallowed my saliva.
I wanted to see her face.
I withdrew my tongue and slowly pulled back.
Tears had dried on her small cheeks. She looked up at me with those pitiful, trembling eyes.
I should never have done this. She shouldn’t be looking at me like that.
No words would come.
Mother… I’m sorry. In a single day, the son you raised with such devoted love has fucked the older sister you cherished and molested the little sister you raised with the same care. I really am trash.