The Unyielding Erotic Walls
"Haaah! My pussy! It’s being crushed! Ah! Ahhh!"
I gripped my older sister’s wrists, using them as handles to ruthlessly ram into her. 'Come to think of it, I’ve never done it from behind with Mom. This is my first time doing doggy style with my sister.' Watching her lewd, swaying hips as she put on a show of coquettish delight, a sense of conquest dominated my mind—the thought that I was the first man to tame this magical, bewitching backside.
Thwack! Thwack! As I rocked my hips harder, the sound of her buttocks colliding with my abs grew increasingly obscene.
"Haaah! Hngh! Haaah!"
"Damn it! Stop trying to seduce me just by shaking those tits...!"
"Haaah! You called them, t-tits, to your sister! Haaah!"
"Hngh."
Perhaps because it was a position I’d tried for the first time, the urge to ejaculate rose quickly. Watching my sister, I realized that every person has vastly different sexual walls. While the mother and daughter shared a similar, pregnancy-optimized physique that eroded a man’s reason, and both leaked lewd fluids or rolled their eyes back and shed tears and snot when their wombs were crushed during climax, their sexual preferences were polar opposites.
When I have sex with Mom, if I tell her I’m about to finish, we embrace tightly or mix our tongues in a deep, wet kiss as she prepares to receive me. But what I felt playing with my sister was that she reacts more intensely to play that comes without warning. She is a total pervert who feels intense arousal when she is dragged into the abyss—whether it’s twisting her nipples, pinching her clitoris, or grabbing her breasts without notice. So, I decided not to warn her when I was about to finish. I didn’t even give her time to prepare by tapping against her womb like I did yesterday.
Now, with the urge to ejaculate at its peak:
Squish! Kyung! Sploosh! Sploosh!
"Kuhk! Ohhh! Haaah! Kehk...!"
Just like that, as if I were doing a normal internal ejaculation, I scraped her vaginal walls, and in the final thrust of my hips, I pushed my cock all the way in to scatter my seeds directly into her womb.
Splat, squish, splat.
"Sss! Wait..."
Against her will, she shook her hips like crazy, as if expressing the peak of pleasure with her body, and went into spasms. My cock, sensitive from just finishing, protested by crushing her womb in confusion.
"Ohhh! Ugh! I can't breaaathe! Kehk! I'm dyiiing!"
Squish, squish.
"Ah! Sister, wait! I'm pulling out, so... just stay still..."
Squish, squish, squish.
"Ohhh! Hnghhh!"
"Augh!"
My sister had completely lost control of her body, shivering all over and shaking her buttocks. I moved my body here and there to pull my cock out, but it had the opposite effect; perhaps the tip of my glans touched a sensitive spot on her vaginal wall, and an unprecedented amount of fluid poured out of her pussy.
Hiss— Pshhh—
"Right there! If you touch it! Haaah!"
"No, I didn't mean to...!"
Splat, squish.
"Ha... I don't know anymore...!"
My cock had already made more seeds to stuff into her womb and was waiting for my brain's permission. I grabbed her breasts and shoved my cock back in.
"Ha!"
Sploosh! Sploosh!
"Kuhk...! Ugh!... Kehk!"
Squelch, pop.
After ejaculating into her womb in succession, I took advantage of her being "broken," grabbed her hips with both hands, and pushed to pull my cock out. Finally, as the glans slipped out of her pussy, a 'pop' sound echoed, and semen and love fluid dripped onto the floor with a pitter-patter.
"Haa... Haa..."
"Hieek! Hiik..."
My sister was leaning against the wall with both hands, head bowed, letting out ragged breaths. I fumbled for a chair, pulled it over, and sat down.
"Whew."
Even though the air conditioner in the room was set to 18 degrees, sweat was flowing all over my body. I swept my sweat-drenched hair back.
"Hngh... Haaah..."
"Are you okay?"
Perhaps calmed down, my sister wiped her face hurriedly with both hands, then turned her head to look at me. She had wiped it in a hurry, but traces of saliva still remained around her mouth, and a few strands of messy hair, stuck to her face by sweat, were clinging to her skin.
"Hehe... I should only do this position... occasionally."
"Ah."
Unable to resist my sister's loveliness, I stood up, hugged her waist, and kissed her.
"Mmm..."
Our tongues intertwined. Slurp. My sister pushed me away lightly and looked up at me.
"Why are you so skilled? How many people have you done this with, huh? Tell me quickly."
There was nothing left to hide now.
"Mom and you."
"Really? You're surprisingly faithful~."
*Smooch*
"Sweet."
We hugged each other's waists and moved our tongues as if competing, exploring each other's mouths. As if dancing in a ballroom, we matched our steps and slowly headed toward the bathroom one step at a time.
After finishing our shower, we filled the bathtub and sat facing each other. Throughout the shower, we hugged and kissed under the stream of water. My sister's breasts were half-floating and half-submerged in the water. They were truly S-rank tits, with a violent size and a shape that had no flaws. They were breasts that were similar to Mom's yet different, impossible to rank against each other.
'Wow, those milk jugs...'
When I buried my face between Mom's breasts and inhaled, the lewd pheromones of a fully mature female hit my brain the moment they passed through my nasal cavity. 'What kind of scent does my sister have?' I smacked my lips and swallowed my dry saliva. My sister poked my chest and abs with her fingers.
"Oh my, they're hard... Did you build them at Hunter School? It must have been very difficult."
"Yeah... well, it was, but it wasn't *that* hard."
"Really? What did you mainly do?"
"I just woke up at 6 AM, ran 100 laps around the track, got punched in the gut by the instructor if I lagged behind, ate, washed up, listened to some classes, ate lunch, had mock combat until I was about to faint in the afternoon, and when I tried to rest after dinner, a friend would come looking for me to spar, so I practiced until 10 PM, fainted, and lived like that."
"Eh..."
Now that I’d said it out loud, it sounded truly miserable. It was unbelievable that I had managed that schedule as a minor. Perhaps it was such a terrible memory that my brain had automatically romanticized it. Still, while others spent their evenings on personal maintenance, I was dragged away by Kang Hyena and beaten up until nightfall. My sister hugged me tightly with a pitiful expression.
*Squish.*
My sister's bare breasts were pressed against my chest, feeling soft and yielding.
"Ah."
My cock surged, poking her under-breast.
"Hm?"
My sister looked at me with a seductive smile.
"Did it get hard because it touched my breasts?"
"Yeah..."
"Sit here."
"Hm?"
"Hurry~"
Following her words, I lifted my body and sat on the edge of the bathtub.
*Slurp.*
"Ah."
My sister’s soft hand gently wrapped around my cock. *Slurp.* She lowered her head and took my cock into her mouth. Without moving her lips, she moved her tongue around, gently cleaning every part of it.
"Wow."
"Puh-ha..."
*Smack!*
"Ack! Hm?"
My sister pulled her mouth away and slapped my cock. It wasn't a hard hit, but a gasp escaped me at the sudden action.
"I hugged you to comfort you, and you couldn't even wait and got horny?"
"Hm? No, it's not like that..."
*Smack!*
"Augh!"
She slapped my cock one more time, just hard enough to feel good.
"Hey, you bad cock, I have to punish you."
*Slurp, slurp, slurp.*
Using her saliva as lubricant, my sister started giving me a fast handjob.
"Did you do wrong or not? Huh? You horny cock, huh? Answer me."
My sister spoke with her mouth close to my cock, as if wanting an answer from it. Every time her breath touched my glans, my body flinched.
"Look at this, it gets even harder when I scold it? Hey! Who ruined this perverted cock like this~ Give me back my younger brother, hey, hey!"
*Slap, slap.*
"Ugh-hut!"
An unsightly groan leaked from my mouth. While gripping my cock, she gently rotated her thumb around the stem beneath the glans and said, "Hurry and say you're sorry, then your sister will kiss it better."
"Hngh!"
Her thumb started to apply more pressure. I felt like I might wet myself at any moment.
"You won't? You won't? Do you want to be scolded more? Huh?"
"I-I'm sorry! P-please kiss it better..."
"So pretty~ Your sister will kiss a good cock better."
*Smooch.*
"Ah..."
*Slurp, slurp, slurp.*
My sister looked up at me with her cheeks sucked in and began fellatio. My head automatically tilted back toward the ceiling in pleasure.
"Wow... damn."
The cock-discipline play I was receiving from my honor-student sister made my mind go blank. I hadn't even known I had such a preference, but it felt like I had opened my eyes to a new world all at once. I never expected to utter words like "I'm sorry" to a woman who was moaning and leaking fluid while pinned beneath me.
'Perhaps... from now on...'
From now on, my sister and I would have sex where our positions were reversed. I didn't dislike it at all.
*Slurp, slurp.*
Her blowjob skills weren't great yet, but the sight of my sister doing her best, combined with the sensibility of this perverted play, brought my ejaculation to the surface.
"Ha!"
Instead of saying I was going to finish, I tapped her head with my finger. It was my pride that kept me from saying I was going to finish.
Sploosh! Sploosh!
"Ugh!"
"Haa... wow..."
*Gulp.*
"Whew... did it feel good? Huh? Did it feel good to finish in your sister's mouth~?"
My sister poked my abs with a highly excited expression.
'Now it's my turn.'
*Splash.*
I hooked my arms under her armpits and lifted her up.
"Eek."
I lowered my head and took a big bite of her breasts.
*Slurp, suck.*
I greedily scraped her nipples with the tip of my tongue. They were as sweet as if they had been coated in honey. As if I had regressed to infancy, I only inhaled through my nose, indulging in her breasts like a madman.
*Smooch.*
"Puh-ha..."
"Whew... this time it's a bit softer?"
My sister said, sweeping the saliva on my lips with her finger.
*Squeeze.*
I grabbed her breasts violently.
"Hieek! Suddenly!"
I grabbed her wrists, dripping wet, and threw her onto the bed after leaving the bathroom.
"...Hngh."
As if she had intuited her fate, she slowly spread her legs. Her pussy lips were glistening with love fluid. My cock, which had finished recovering and was throbbing with its veins standing out, slapped her clitoris.
*Smack!*
"Hngh-eek!"
"Now... the good little brother is gone."
I didn't even give the entrance of her pussy time to greet my glans; I just shoved my cock in.
Squish—
"Hnghhh-oh!"
The clock pointed to 11 o'clock. Our night was long.