I'll Properly Mark You with My Cum
“Hnggh♥ Ahhh! Haa-ahhh♥”
“Runi, your pussy… it’s so tight.”
A cock the size of my forearm penetrated my pussy, driving all the way in until the base hit my entrance.
In an instant, my lower abdomen swelled up, and it felt as if every organ inside me would be dragged out whenever the cock pulled back.
That was how monstrously large the thing was that had been shoved inside me.
-*Squish! Squish!*-
“Haa-nnng♥ Hyaaaah♥”
“How is it, Runi? It doesn’t hurt at all, right?”
“It doesn’t hurt… haa-ng♥ It feels good… it feels so good♥”
From what I remembered, women were supposed to have a hymen that tore during their first sexual encounter, causing immense pain. But I didn’t feel a shred of that.
There had been a sensation of something tearing strongly, a sharp *snap* that enveloped my entire body.
But instead of pain, I was being overwhelmed by a pleasure so intense it made my tongue hang out.
-*Paa-ang! Pang-pang!*-
“Hee-ghhh♥ I, I think I’m gonna die… I’m being pierced… I’m being pierced throughhh♥”
“Runi’s baby-maker isn’t so weak that it’d break from just this!”
-*Paa-ang!*-
“Hnggh♥”
Big sister grabbed both of my arms and pulled them back hard.
At the same time, the cock that had been partially slipping out of my pussy slammed violently into my cervix.
“You have such a magnificent fuck-hole, yet you’ve kept me from eating it until now?”
“Hyaaa-ng♥ N, no… my pussy is…”
-*Squuuueeze!*-
As she pressed down on my lower abdomen where the tattoo was etched, the last shred of my reason completely vanished.
My belly already felt like it was going to burst, and her pressing down on it pushed me to the brink of insanity.
“Hnggh♥ D, don’t press… haaa-ng♥”
“Runi’s pussy is the best. It’s so tight I feel like I’m going to cum already.”
“N, no… inside… inside…”
“I’m going to cum inside my exclusive fuck-hole. Ugh…!”
“Hgyaaaa-ng♥”
The moment the tip of her cock hammered into my cervix again, a massive amount of semen erupted inside me.
My womb couldn’t handle the sheer volume, so it naturally sprayed back out of my pussy.
“Ugh… haa… Runi’s fuck-hole is full of my cum♡”
With an ecstatic expression, big sister finally withdrew that monstrous cock from my pussy.
-*Schlorp!*-
“Huu-hee-ghhh♥”
Because I had been clenching so hard, the sensation of it sliding out was just as intense.
-*Squuuueeze!*-
“Hgh…!”
She pressed down on my lower belly once more.
Like water draining from a bag, thick, pure white semen continued to pour out of me.
“Haa-ng… I, I’m so tired…”
I didn’t have the strength left to do anything else. I just wanted to close my eyes and fall into a deep sleep.
“Runi, it’s not over yet.”
“Uh…?”
As if to prove her words, even after two ejaculations, her cock remained in its monstrously erect state.
Soon after, she grabbed my waist, forcing me to support my body with my hands and feet.
“Big sister…?”
I knew instinctively that that monstrous cock was going to tear my pussy apart again.
That was why I was terrified.
My body was already a complete mess; I didn’t know what would happen if I got fucked by that thing again.
-*Tz-ghhh!*-
“Hgh…!”
“Since Runi is my exclusive fuck-hole, you have to stay fucked until my erection goes down.”
“N, no… r, right now…”
-*Puuu-wuck!*-
“Hee-ghhhhh♥”
Regardless of my wishes, the cock pierced my pussy and drove all the way in again.
It was completely different from before.
If the previous sensation had been a giant cock simply moving back and forth, this felt like it was crushing my womb from top to bottom.
-*Clench!*-
She gripped my buttocks tightly, not loosening her hold in the slightest. It was as if she were holding onto handles to make her posture more stable.
“How is it, Runi? Are you finally going to admit you’re my exclusive fuck-hole?”
“N, no… no… Hya-gaaa-ng♥”
Whenever I tried to deny it, the cock assaulted my pussy even more cruelly.
I was clearly a virgin. And I hated the idea of being unilaterally violated by a familiar I had summoned.
But strangely, very strangely… I couldn’t help but welcome the intense sexual pleasure.
-*Paa-ang!*-
“Hngghhh♥”
“Runi, look in front of you.”
She whispered into my ear in a playful voice.
In front of me stood the mirror placed in the Hall of Summoning. I was forced to watch my own lewd, being-fucked appearance in vivid detail.
Every time the cock drove deep, my lower abdomen bulged outward. My breasts shook violently, and saliva and sweat mixed together and splattered everywhere.
Contrary to the voice in my head screaming that I hated this to death, the me in the mirror had her tongue lolling out, enjoying the situation of being eaten like a dog.
“Hee-ghhh… slurrrp♡”
“Heh, are you licking yourself while you’re being eaten?”
Was I craving even more stimulation? My long, extended tongue began to fervently lick the clean mirror.
It felt as if my whole body was shivering, as if I were licking my own lewd self.
-*Pang! Pang-pang-pang!*-
“Runi, does it feel good?”
“Huu-ghhh♥”
“You have to… answer me!”
-*Puuu-wuck!*-
“Oghhh♥ Hee-ghhhhh♥”
With that demand for an answer, her pelvis and my buttocks collided violently.
My mouth, which had been busy letting out moans, struggled to move and spill out my feelings.
“It feels… so… good-ahhh♥”
“From now on, whenever big sister shows you her cock, you open your pussy. That’s what a fuck-hole is supposed to do.”
“Yeshh♥ O, okay… I’ll… I’ll open my pussy♥”
“Good. Then I’ll properly mark you with my cum.”
“Nng-ghhhhh♥”
-*Pshhh-uuut!*-
The cock buried deep inside me twitched violently. It felt so hot that it was beyond just warming my insides; it felt like I was being burned. Along with a massive amount of semen, my pussy sprayed out a flood of arousal fluid.
“Ogh♥ Hgh♥”
Just as I couldn’t even manage to let out a proper moan, my vision suddenly went black.
*
My dark vision slowly began to brighten.
It became so bright that my eyes opened, and I saw a familiar ceiling.
“Where am I…”
It was none other than my room.
“Ugh…”
I sat up with an inexplicable headache and confirmed that my body was wrapped in my cozy pajamas and quilt.
“Ah, my head.”
The moment I got out of bed, complaining of the headache…
“Huh?”
I noticed something different in the mirror.
“What is this?”
I took off my pajamas to get a better look and stood in front of the mirror.
My eyes weren’t deceiving me.
My breasts… had grown.
And by a lot!
“What the hell is this?”
My breasts, which had been infinitely small until yesterday, were twice as big by the next day.
Just as I was feeling utterly bewildered, I saw the tattoo etched onto my lower abdomen.
The moment I saw that tattoo, a wave of intense headaches brought a flood of memories rushing back.
“It… it wasn’t a dream?!”
The familiar I had summoned at the Hall of Summoning was actually big sister Beli, and big sister Beli was a demon with a cock.
And I had been eaten like a dog by that demon.
While moaning until my throat felt like it would burst.
“What on earth is this…”
Reeling from the despair of reality, I felt the need to grasp the situation better.
I went back to my pajamas and threw the door open.
“Runi, are you awake?”
“Mother?”
“Runi, we were so worried. Are you hurt anywhere?”
“Father…”
My parents looked at me with worried eyes.
“How did I get home?”
“Beli found you collapsed at the Hall of Summoning and brought you back.”
“What? Big sister Beli did?”
“Runi!”
-*Squish!*-
Big sister Beli appeared suddenly and hugged me from behind.
At that moment, her massive breasts pressed firmly against my back.
As soon as I saw her face, I had no intention of continuing the conversation with my parents and went into my room with her.
After locking the door tightly, I sat her down on the bed.
“Big sister, what is going on?”
“What do you mean? You summoned me and we made a contract.”
“I summoned you? In the first place, are you even a demon?”
“You saw everything yesterday.”
“Then… that… c, cock?”
“Heh, you can say ‘cock’ on your own now, can’t you?”
Big sister Beli lifted her skirt without hesitation.
There was no monstrous cock there like I had seen yesterday; only a pussy existed.
Just as I thought it might have been a dream, horns sprouted from her head.
Her eyes turned red, she took on the appearance of the demon I had seen yesterday, and a monstrous cock appeared where there had been nothing before.
It was limp since it wasn’t erect, but it boasted an absurd length that reached halfway down her thighs.
“I have a cock.”
“Why… do you have that? Are demons… supposed to have them?”
“I am a demon who governs human lust. Therefore, I possess both male and female genitalia.”
She began to wear a sinister smile, then grabbed her flaccid cock and shook it up and down.
Because of its considerable length, I watched it whip around like a lash.
“W, what are you doing!”
“Why are you like that? You’re my exclusive fuck-hole now, so you don’t have to be shy.”
“When… when did I become your exclusive fuck-hole!”
“That’s strange. I clearly heard everything last night.”
The memories of last night that hadn’t surfaced yet came rushing back with those words.
Moaning while being fucked by her, and not stopping there, even calling myself her fuck-hole.
Is this something a human being is supposed to do?
“Ugh… I want to die.”
“This lust-mark signifies our contract.”
“This…?”
“Yes, thanks to this mark, it didn’t hurt at all even though your hymen was torn.”
I had learned information I never wanted to know.
I needed to wash my ears out right now…
“And as long as this mark exists, pregnancy is impossible.”
“What… does that mean?”
“It means I can fill Runi’s baby-maker to the brim with my cum as much as I want.”
I wasn’t joking—if I could kill her right now, I would kill this demon shaking her monstrous cock.