If You Don't Know, Mom and I Will Just Have to Impregnate You to Find Out

The ejaculation continued for quite a while.

Even though the inside was already so full of semen that it was overflowing from my womb, Baek Jiyoon's futanari penis remained fully erect, still pressing deep against my cervix.

"Ngh, haa-aah... ♡"

"Ah... ♡ I love your pussy so much, Sis. ♡ You won't even let me go even after I've finished. You're so ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠lewd!"

"Th-that's..."

I knew I should stop here.

I knew that things like this shouldn't be happening.

But perhaps it was because my female instinct had surged so high.

My womb still throbbed with a powerful, aching need, as if it were begging to receive more of Jiyoon's semen.

"...Because I want to receive more of Jiyoon's semen... ♡"

"Aha... ♡"

At my words, Jiyoon smiled with satisfaction and pulled me into an embrace.

"Ghh... ♡"

"My dear sister, you wanted more of my cum?"

Squish— Squish—

Jiyoon began to move her hips slowly, churning the semen inside my pussy. My womb was already sensitive from the constant contact, but with her moving inside, every friction sent tidal waves of dizzying pleasure crashing over me.

"Ngh, ooh-ooh... ♡ Haa... ♡ Ngh-iiik!! ♡"

"It's only right for a loving younger sister to grant her sister's wish, isn't it?"

"Haaaaaak!! ♡"

Pop—

Jiyoon pulled her penis out just enough to break contact with my womb, then forced me to lean my upper body over the sofa. She aligned her glans with my pussy, which was already leaking a mix of fluids, and before I could even think to stop her, she rammed it back in all the way to the root.

Squiiish!!

"Ngh-iiiiiik!! ♡"

With her full weight behind it, the penis pushed even deeper. Unable to resist, my pussy, already at its limit, erupted in a flood of aek—my own juices mixed with the semen already inside.

"Hoo... You're so incredibly horny, Sis. ♡"

"Ooh... ♡ Oh-ooooh... ♡"

"If we weren't sisters, I'd make you my exclusive female sex toy. It's such a shame. ♡"

Jiyoon chuckled and thrust her hips violently once.

Thwack!

"Ghh-iiik!! ♡"

"What do you think, Sis?"

What do I think?

Well, obviously...

"...I think it's only natural for people who love each other to have sex. ♡"

"Heh. Really? Then it's perfectly normal for me to fuck you, right?"

"Th-that's right... ♡"

I couldn't even grasp what I was saying anymore. The only thought filling my brain was that I wanted to feel even better. The idea that sisters shouldn't have sex had completely ceased to exist.

"Then, I'll make sure to fuck my lewd sister properly. ♡"

Jiyoon grabbed my wrists and pulled them behind me. Unlike before, she began to thrust with wild, rough abandon, slamming her penis into me.

Squish-squish-squish-squish!!

"Ngh-it, oh-go-hooh!! ♡ Ngh-uh... ♡ Gh-hoooo-ot... ♡ Oh!! ♡"

"Ah, Sis... Who did you take after to be this lewd? Mom and Dad are both so erotic, I can't even tell who you inherited it from."

"Haa-aek... ♡ Gh-hit... ♡ Gh-hooooo-ok!! ♡"

My buttocks and Jiyoon's pubic bone collided frantically. The lewd sound of wet flesh slapping against flesh filled the living room, accompanied by my own animalistic, obscene moans.

"How many kids are you going to have later, Sis? You've got such a perfect child-bearing pelvis—you aren't planning on having fewer than ten, are you?"

"I, I don't kno-oow... ♡ Ngh-gh-huk... ♡ Haa-aeeet!! ♡"

"Hmm. If you don't know, Mom and I will just have to impregnate you to find out."

Jiyoon gripped my arms even tighter.

"Can't be helped. I'll just have to fill you with plenty of semen again today."

"Eh...?"

"Be prepared to be ejaculated inside at least twenty times today, Sis. ♡"

As if to prove she was serious, Jiyoon increased the speed of her thrusts.

Pang-pang-pang-pang-pang-pang—!!

With the increased speed, her hard glans assaulted my womb with even greater force. How many women in this world could keep their sanity after being hit like that? I could say for certain that such a person didn't exist.

"Gh-hii-iik!! ♡ Ngh-hek!! ♡ Oh-go-hot, oh... ♡ Oh-oh-oh-ok!! ♡"

Based on what I was experiencing right now... I could conclude that this was a level of pleasure no woman could ever endure.

"Haa-aeeet!! ♡"

Splurt! Spluuuurt!!

My vision flickered incessantly. I had lost count of how many times I had climaxed, spraying aek from below. The sofa was already soaked through. Even so, Jiyoon showed me no mercy. Instead, she assaulted my womb even more violently, determined to plant her seeds deep inside me.

"Alright, Sis. Here comes another shot. ♡"

"Ngh-hoooo-ok!! ♡"

Splurt!! Spluuuuur-t!! Vub-vub-vub!! Vuuut, vuk! Vuuu-r-r-rk!!

A violent stream of semen erupted from her glans, striking the walls of my womb. The pleasure of having my most sensitive spot stimulated, combined with the feeling of my womb being filled to the brim—the two sensations collided like a tidal wave, forcing me to climax over and over again without any hope of resistance.

"Gh-hii-iii-ik!! ♡"

Vub-vub-vub-vut!!

"Haaaaak... ♡"

Spluuuuur-t—!!

Why is everyone in our family so prolific? Because they ejaculated in amounts my womb could never handle... I had the strange illusion that my uterus was slowly stretching out.

"Sis, you know we're not done yet, right?"

"Y-you, why are you still so hard... ♡"

"Because you're so fucking hot, that's why."

Jiyoon lifted my body, which had gone limp from the climax, pulled her penis out, and laid me flat on the floor.

"How could I lose my erection with a lewd sex toy like you, Sis? ♡"

"S-sister..."

"Sis."

Whoosh!

Jiyoon grabbed my legs, lifted them, and said:

"I told you. Be prepared to be ejaculated inside at least twenty times today."

"That's, true, but... ♡ This is... ♡"

"If you heard me, just lie there and take it!!! ♡"

Thuuu-u-u-u-u-u-uck!!

"Oh-oh-oh-oh-ok!! ♡"

Jiyoon's massive, club-like penis slammed vertically into my womb. After she finished thrusting, her body shuddered, and a satisfied smile spread across her face.

"Ah... ♡ Sis, our sexual compatibility is just perfect. It feels so good when you clench your pussy around me. ♡"

"Ngh-go-ho-ok... ♡ Oh, oh-oh-oh-oh... ♡"

"Usually, other girls would have collapsed by now, but you're holding up well, Sis."

Squish-squuuu-u-u-k!!

"Ngh-gh-huk!! ♡"

Every time her penis slammed down, I felt like I was losing my mind. It was a pleasure so dizzying it defied description. My waist arched on its own, mirroring the pleasure I felt every time I had sex with Mom.

"You're a body optimized for being a female sex toy. ♡"

"Haa-ek... ♡ Haa-aeeek... ♡"

I couldn't deny it. Objectively speaking, my body was nothing more than an obscene... walking, breathing onahole. Perfectly suited for being fucked by a futanari.

"I noticed you still seem to be denying that you're a female, Sis... I'll just have to wipe that away for you. ♡"

"Eh, he-ee-ee...?"

"Unlike Mom, I don't have much patience. I want you to change all at once. ♡"

Jiyoon slowly pulled her penis out to prepare for another round.

"S-sister... ♡ That's not it... ♡ It's really not... ♡"

"What do you mean it's not? You're a female, so don't get ahead of yourself. ♡"

With that, Jiyoon took a deep breath and began to slam her hips down rapidly, as if she were splitting a log with an axe.

Squish-squish-squish-squish!!

"Ngh-go-ho-oo-ot... ♡ Ok!! ♡♡ Ngh-gh-hii-iit!! ♡"

It was a breeding press fueled by the singular, desperate will to impregnate me. There was nothing I could do against it. I couldn't escape; I could only receive the semen of my lovely futanari sister.

"Jiyoon, I... ♡ Ngh-ok... ♡ This is really, I'm gonna die... ♡ I'm gonna dieee... ♡"

"You're complaining after taking Mom's cock too?! Shut up, just take it, and get pregnant already!!"

"Gh-hoooooooo-ok!! ♡"

Is ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠this really the kind of conversation sisters should be having? I don't know anymore. I've ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠decided to just accept that this is how things are in this world.

"Sis, clench your pussy harder!!!"

Slap!!

"Gh-hit!! ♡"

"Clench it harder, I said!!!"

Slap! Slap! Slaaaap!!

"Ah-h-h-h-h-uk! ♡ Ah, haa-ak! ♡ H-h-h-it... ♡"

Jiyoon slapped my buttocks while thrusting, demanding I clench my pussy tighter. ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Why does she have such a stinging touch for a girl? To avoid getting hit again, I had no choice but to clench my pussy as hard as I could.

"Ghh... ♡ Ahhh... ♡ It's, coming, the semen is coming... ♡"

As I clenched, Jiyoon's penis began to twitch.

"Sis, take it all, not a single drop wasted... ♡ I'm definitely going to get you pregnant today... ♡"

"Haaaaak!! ♡ Gh-hup, ha-ek... ♡ Ngh-hu-u-uk!!"

"Alright then, here comes my special futanari concentrated cum. ♡"

Before she could even finish her sentence, Jiyoon pressed her glans firmly against my womb once more.

Vub-vub-vut!! Vuuu-r-r-rk! Vut, vuuu-u-u-u-rk!! Vut!!

She fired a stream of cum directly into my womb.

"H-hii-iik!! Gh-hooo-ot... ♡ Oh-ok, oh?! ♡"

Semen was injected into my womb without pause. Looking at the concentration, I was certain this would be enough to guarantee pregnancy, but Jiyoon didn't stop there—she reached out and choked my neck tightly.

"K-khup!? ♡"

"Get pregnant. Get pregnant already. Just get pregnant while being choked, like the female sex toy you are. ♡"

"Ke-hek, hup, gh-huk... ♡"

Jiyoon continued to ejaculate repeatedly while choking me. Vuuu-r-r-r-rk!! My mind was already hazy from the repeated climaxes, and with my neck being squeezed, my vision began to blur.

"Sis, I love you so much... ♡ Let's have my baby, live together forever... ♡ Let's make children... ♡"

Make children forever? I don't want that. That's no different from being told to become a baby factory. But the words "I don't want to" stopped at the tip of my throat.

Why?

Ah, that's right... ♡

I guess it's because I love receiving semen so much... ♡