Chapter 3 - Losing My Virginity to My Older Sister
"...There’s no penis!?"
Is it possible to be this shocked by the absence of something that's supposed to be there? My stupid older brother, Calibur—arrogant, foolish, and someone I thought was nothing but a nuisance.
But when I stripped "him," the thing that was supposed to be between those legs wasn't there. In short: no dick.
In its place, on a smooth, prepubescent crotch without a single hair, was a thin, vertical line.
The thing that every man should have was missing. Even if it had shriveled to the size of a pea from the shock and terror of facing a monster, it wouldn't just vanish into nothingness.
There could be only one conclusion...
The person I thought was my stupid brother was actually my stupid sister!?
"Calibur, were you a girl this whole time!?"
No, that’s impossible. Why? Because we’re biological siblings. I’ve lived with this person under the same roof for as long as I can remember, for better or worse.
How could anyone possibly mistake someone's gender under those circumstances!?
"Wrong! I'm a man!!"
...Well, that’s what the person in question is saying!
"No, you're a girl! The thing in your crotch is clearly a pussy-slit!"
A green fruit that hasn't even reached maturity! The scent of immorality was overwhelming; the smell of ammonia that was disgusting just moments ago now seemed almost sweet!
"But... but they said girls can't become knights...!"
"Huh? What do you mean?"
"That's what I was told! So, to become a knight, I have to become a man...!"
Hmm? If I break down what Calibur is saying, does it go like this?
Calibur was blessed with the [Knight] 'Divine Calling'. [Knight] is a popular class in the city—an enviable path that promises status and a wealthy life if played right. Did someone jealous of that talent feed her a bunch of lies? She is arrogant and constantly annoying people, after all.
Actually, I don't know if a woman can become a knight in this world or not. It’s a fantasy world; details vary even if it looks medieval. Though, I really hope the "Kukkoro" (Ugh, kill me!) female knight culture is rooted here.
"..."
And right in front of me was a promising little bud of a female knight. My "stupid brother" turned "stupid sister," Calibur.
"...Listen, a man has to have a penis."
"Eh? What’s that?"
Calibur, ignorant of male anatomy, was actually pretty cute.
"This."
I lowered my own pants and let the little magical beast hidden inside pop out. My penis was turgid and erect, curving upward as if to pierce the heavens the moment it was set free.
I wonder why?
"Hiee!? What is that!?"
Witnessing an erect penis for the first time in her life, Calibur looked visibly terrified.
"Why...!? Why is there a stick growing out of the part where you pee? Wouldn't that get in the way!?" "Hmm, well, when it's not in use, it transforms into a form that doesn't get in the way..."
It’s the mystery of life.
"Men have a penis, and women don't. That’s the most obvious difference between the two."
"Then, if I have a penis, can I become a man too!? Tell me how to grow one!"
Wow, that is the most unreasonable request I've received since being reincarnated. Regardless...
"Can you say 'penis' one more time?"
"? Penis?"
"Keep going."
"Penis, penis, penis, penis, penis...?"
Nice. There's something great about a young girl saying lewd words in total ignorance.
"Hmm..."
I took another look around. We were deep in the forest that everyone warned us was dangerous. The bear monster that had been acting like it owned the place earlier had been beaten so badly it likely wouldn't be coming back.
We were outdoors, but the dense forest was a private room without walls, completely hidden from public view. There was no one here but the two of us.
"For now, let's hang those pee-soaked clothes on a branch to dry. Let’s dry your shirt too, just in case."
"Huh? My shirt isn't wet, though?"
"Just do it."
I made my bewildered sister raise her arms and stripped her shirt off too. Now, Calibur was completely naked from head to toe.
"W-why are you getting naked too? You aren't wet, are you?"
"Just because."
I stripped as well. Two siblings, standing stark naked and facing each other in the middle of the forest.
I grabbed both of Calibur’s legs—she still couldn't stand due to her weak knees—spread them wide, and rubbed my erect penis against her wide-open crotch.
"Eh? Wait? What are you doing? Huh?"
My glans moved back and forth along that clean slit. The slippery, wet sensation from her accident felt surprisingly good.
"Do you know why there's this difference between men and women?"
"I don't know that...! It doesn't matter, I just want to be a grown man...!?"
"Once you know the reason, you'll think being a girl is pretty good too...!"
Squish, squelch, squish...
Rubbing my penis against her crotch was intensely erotic and felt amazing.
"Ngh...? Yuhaaa, ahn...!?"
She was definitely feeling the stimulation. Calibur was squirming and confused by the "female" sensations she had been denying until now. A slimy moisture began to increase at her crotch. A fluid distinct from urine was definitely leaking out of her.
"What is this...? Something... it feels all tingly where I pee...!?"
"That’s the beauty of being a woman. It’s a pleasure only a girl can feel, you know?"
Though men have their own pleasures too.
Now, Calibur was almost certainly a virgin, and since her body had been denying her womanhood, her sensitivity surely wasn't developed yet. Despite that, the reason her bud was opening so easily was likely because of me.
My skills as a [Pole Master] were irresistibly forcing this female body to bloom, even if it wasn't prepared at all.
[Master of the Bed], [God Hand], [Erogenous Critical Rate Up (Extra Large)], [Pheromones (Extra Thick)]...
These skills could develop the sensitivity of even the most stone-cold, dull woman and turn her into a melting mess. While rubbing her slit with my penis, I reached up and touched her chest with both hands.
"Ngh-hieeeeee!?"
I caressed the flat surfaces that could hardly be called breasts yet, but the protrusions were already unmistakably female—large, bean-like nipples. Nipples this size are something a man could never imitate.
When I flicked them with my fingertips, Calibur spasmed as if an electric current had run through her.
"Ngh-hieeeeeee!? Hie!? Hieeeeeeeeeeee!?"
[Erogenous Critical Rate Up (Extra Large)] activated. Between my smooth talk and my skilled hands, Calibur’s body—which had been rejecting its femininity—had melted into a puddle.
The time was right.
"Alright, time for the real thing."
"Eh? There’s more? Stop, I'm already at my limit. If you do anything else... I'll fly away! I'll go somewhere else! Noooooooo!?"
I took the hole that shouldn't have been ready yet, loosened it up perfectly with my [Pole Master] power, and then... ...I thrust it in!
"Ohooooooooooo!? Oh!? Oooooooooooo!?"
Was that Big Sis Calibur's first cry as a woman? Congratulations on your very early graduation from virginity! I never thought the person I’d give my virginity to would be my own biological sister!
Regardless, I’m going to start moving now.
Plap, plap, plap, plap, plap...!
"Oh!? Oh!? Ooooooooh!? What is this!? A penis... a penis is stuck in my crotch!? It’s stabbing me, I’m gonna dieeeeeee!?"
"It's okay, it's okay. You're not gonna die."
An unknown situation happening to her own body. It’s no wonder she felt like crying, but I calmed her down skillfully.
"Every woman is built to be able to do this. There’s an organ inside your body meant to swallow a penis. Your body is just fulfilling the function it was meant for."
"Why... why do I have to swallow a penis?"
"Because... it makes you feel good?"
There were probably other things I should explain, but I'll skip those for now and focus on feeling good. This is my commemorative first sex in another world, after all!
Bang, bang, bang, bang, bang...!
I dialed up the speed of the thrusting.
"Nfuuu!? Fu, ooooooooooh!?"
"How is it, Big Sis? Does it feel good?"
"I don't really know... but, my crotch is so tingly... ❤️❤️"
Now that her gender was revealed, the "Big Sis" label stuck immediately. There’s something hot about railing her while calling her "Big Sis."
"Your pussy makes my dick feel so good, Big Sis...! Let's have sex every day from now on, okay...!"
"Ehaaaaaaaa ❤️❤️ Hieaaaaaaaaaaa ❤️❤️"
If we do that, she’ll surely understand the happiness of being born a girl!
"This is no good—noooooo ❤️❤️ My body feels so light ❤️❤️ This is the first time, I'm flying, I'm flying, I'm flyingggggggg!❤️❤️❤️❤️" "Haaaaaaa! I'm comingggggggg!"
My first sex in this new world was, of course, a creampie.
Splurt, swooooooooosh!!
"Ahieeeeeeeeeeeee! ❤️❤️❤️❤️"
The moment she received the semen inside her, my sister’s entire body shook and spasmed. Her small body took on a mysterious, glossy glow as she truly became a woman.
"Hie ❤️❤️ Hieeeeeeeeeee... ❤️❤️"
"See? Being a girl isn't so bad, right?"
It’s impossible to change your gender no matter how much you want to, anyway. In that case, it’s best if I keep having sex with her every single day to teach her the joys of being a woman.
As for me, if the person I thought was just a nuisance is going to live with me as the ideal sex partner, nothing could be better.
"Big Sis, let's kiss. A kiss."
"Eh? Muchu? Chu... ❤️❤️"
I did whatever I wanted with her young body, which was exhausted from her first climax. From now on, I’m going to keep her addicted to sex and raise her into the lewd, erotic woman of my dreams.
That way, she’ll stop talking nonsense about "wanting to be a man," and my penis will be satisfied too. Two birds with one stone.
For now, I inserted myself into her once more. Her body, made sensitive from just reaching a peak, jumped with a "Ngh ❤️❤️ Mmmmmm! ❤️❤️❤️❤️"
"Ah, Big Sis' pussy feels so good. I'm gonna have sex with you every day. Definitely." "Hiaaaaaaaa ❤️❤️ Ahn ❤️❤️ Nooooooo ❤️❤️ Another wave of pleasure is comingggggg! ❤️❤️❤️❤️"
The forest exploration with my sibling, which used to be nothing but a annoying waste of time, was about to become the highlight of my day starting now.
My isekai life was off to a perfect start.
And then.
Five more years passed.
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