If You're a Personal Fucktoy, You Have to Act Like One to Get Screwed
Amidst the overwhelming confusion, I felt a strange sense of pleasure that left my head spinning.
To think I would spurt out like this just from a finger slipping in and out once.
It seems the effects of the lewd seal are still lingering in my body.
“You really soaked yourself, didn't you?”
“Hnnng…”
“Runi, this is your body now. It’s what makes you so lewd and horny.”
“N-no… this is because of the seal…”
“Is that so?”
Big Sister pulled up my lace nightgown without hesitation.
The lower abdomen where the lewd seal was etched was instantly exposed.
“The seal isn't emitting any light at all.”
“Uh…?”
“That means the seal’s effects are completely inactive.”
“N-no, that’s not true!”
Just as I gathered my magic to push Belial away, the seal began to emit a brilliant light.
With the familiar, rhythmic throbbing in my lower abdomen, my posture collapsed instantly.
“Hnyaaaah…!”
“This seal is going to absorb Runi’s mana.”
“What…? Then does that mean I can’t use magic at all?!”
“No, you can still use it. If you fill the mana the seal requires through other means.”
—Thump!
Once again, Sister transformed into her demonic form.
She crouched down and spread her legs, the tip of her hideous phallus touching the floor, flaunting its presence.
“A demon’s semen is a very effective way to replenish the seal’s mana.”
“D-don’t lie to me.”
“I don’t lie about things like this. I swear it on everything I am.”
“Then… in order for me to use magic like before…”
It meant I had to be impaled by that hideous phallus until the mana required by the seal was filled.
I would rather die than do that.
I didn't want to feel that sensation of my womb being filled with a demon’s semen ever again.
“Well, if you don’t want to, I can’t help you. You just won’t be able to use magic until the seal is fully charged.”
“H-how much do I need?”
“Enough mana to cast a high-ranking spell about ten times.”
“Wha…?”
“Even then, the stored mana will decrease as Runi goes about her daily life.”
Even though I’ve been cultivating the talent I’ve had since I was young, I don’t have enough mana to cast high-ranking spells ten times.
With my current mana, if I squeezed out every last drop, I could manage twice.
After that, it takes a month for my mana to fully recover.
And even if I managed to fill it ten times, it would decrease just by living my daily life?
I had no confidence in filling the seal’s mana on my own.
“It’s your choice, Runi.”
Giving up everything and being unable to use magic at all was not an option I could choose, no matter how I looked at it.
“Ugh… let me ask you one thing.”
“Ask away.”
“To fill the seal’s mana with… Sister’s semen… how many times… d-do I have to do that…?”
At this question, Belial held up her right hand with all five fingers spread wide.
“F-five times?!”
“Yes, five times. You received two last night, but by now, the stored mana has probably decreased.”
“Why on earth does the stored mana decrease?”
“You’ll find out the reason later.”
She had been telling me everything else, but she kept the answer to this question a secret.
There were many paths before me, but there was only one clear way forward.
Accepting Sister’s semen into my womb five times.
And even then, I would have to keep refilling it whenever the mana dropped.
—Clench!
Thinking that this unpleasant path was the only certain one, my lips and hands trembled with tension.
“O-okay… I’ll do as you want, Sister.”
“A wise choice.”
In the end, walking the only certain path before me was the only answer.
“But… I have a condition.”
“Go on.”
“Y-you can’t just force yourself on me. Only when I say it’s okay!”
“You sound like you’re dating me, Runi.”
“W-what are you talking about…!”
“It feels like a contractual relationship.”
While my insides were burning, Sister was simply enjoying this situation to the fullest.
“In that case, let’s start by moving out.”
“Why move out?”
“Do you think we can have sex in a house where your parents are always around?”
“That… is a fair point.”
Belial, having returned to her human form, smoothed out her clothes and threw the door open.
When she reached out a hand in the form I was so familiar with, I felt a momentary sense of relief and took it.
“Mother, Father.”
“Yes, Runi? What is it?”
“I have something to tell you.”
“Go ahead, speak freely.”
“I’ve decided to move out.”
At those words, the two of them looked at each other, then stared at me with worried eyes.
“Runi, why the sudden move…”
“I failed my summoning. I believe it was due to my own lazy state of mind.”
“Runi, you don’t need to think that way.”
“I need to grow mentally, so I’ve decided to leave the comfort of your home.”
It was a reason I had made up on the spot, but even to me, it sounded quite reasonable.
I looked at my parents with an unwavering gaze.
My parents opened their mouths for a moment, but no words came out.
They simply nodded.
“Very well, Runi. If that is your choice, we must support you.”
“Would you like us to help you look for a place?”
“Yes, Mother.”
“Mother, Father. Don’t worry. I’ve decided to live with Runi.”
That single sentence brought a glow of relief to my parents’ faces.
“Is that so?”
“If Belial is living with her, we can rest easy.”
With the reasonable excuse I’d fabricated and Sister’s support, my independence was secured.
*
Time passed, a house for my independence was found, and the move was completely finished.
“Belial, please take good care of our Runi.”
“Yes, Mother.”
“If anything happens, make sure to contact us.”
“Yes, Father.”
“Mother, Father. I will definitely succeed.”
After seeing my parents off, I closed the front door of the house where I would be living from now on.
Since I had moved around a lot due to the move, I tried to catch my breath, but something brushed against my back.
“Huh?”
Sister had transformed into her demonic form and was rubbing her throbbing phallus against my back.
“What are you doing…?!”
“Hm? My phallus was feeling stifled, so I took it out.”
“S-stifled?”
“When I’m in human form, it’s like keeping it tightly hidden away. Imagine how stifling that is.”
As if to prove her point, Sister’s phallus twitched incessantly.
“You have to give a phallus this big some time to breathe.”
—Stroke! Stroke!
She stroked the shaft with a slow hand, then rubbed the glans with her fingers, tracing its shape.
Sticky pre-cum was leaking from the tip, and soon the glans was completely covered in it.
“Slurp… Mmm, it tastes like it’s begging to enter a fucktoy.”
She licked the pre-cum off her fingers and left a bizarre comment.
“Ugh…”
The seal on my lower abdomen wasn't exerting any power at all.
Yet, my body was beginning to heat up little by little.
I pressed my inner thighs together to keep them out of Sister’s sight, then looked down at her rising phallus.
“Gulp…”
That’s right, this isn't an act to satisfy my own lust.
It is the only act I can perform to use magic again as quickly as possible.
“F-follow me inside…”
I took Sister’s hand and walked to the bedroom.
With trembling hands, I began to peel off my clothes, layer by layer.
Unlike me, Sister revealed her naked body with a single snap of her fingers.
—Stroke! Stroke, stroke!
As if she enjoyed watching me undress in front of her, she rubbed her phallus up and down with a small smile.
This lewd behavior bothered me, so I turned around and took off all my clothes.
“Ugh…”
I climbed onto the bed and hesitated, looking at her erect phallus.
Then, Sister’s two fingers touched my pussy.
—Squish!
“Hnnng-ahhh♡”
“Oh, that’s strange? I didn't even touch you, so why is your pussy so wet?”
Just as Sister said, my pussy had already been soaking wet for a while.
The moment she spread my labia, my arousal dripped out, enough to soak the bed.
“It seems your fucktoy wants the cock.”
“D-don’t… say things like that…”
“I can put it in now.”
I bit my lip hard and slowly pushed my hips back.
Sister knelt up and began to slowly rub the tip of her phallus against my pussy’s entrance.
“Runi, say it.”
“Say what…?”
“What Runi wants right now is Sister’s phallus. You have to say it properly for me to put it in.”
With the seal inactive, she was asking me to spit out lewd words while completely sober.
As if that were even possible.
“J-just put it in… hurry… just get it over with.”
“Hmm, I can’t screw you if you’re like that.”
“B-but Sister, you like screwing me too…!”
I held onto the resolve that no matter what happened, I wouldn't say what she wanted.
—Press! Rub, rub!
“Hnyaaah♡”
Sister, who had been watching me from behind, brought the tip of her phallus to my clitoris and ground it against me.
I could feel the intense body heat and the sticky pre-cum coating my clitoris.
“That’s not true. I just love it when our Runi becomes my personal fucktoy.”
“Ngh-hnnng♡”
“If you’re a personal fucktoy, you have to act like one to get screwed.”
“J-juuust… hng-ugh♡ S-screw… me…”
“If you keep acting like this, you won’t have a phallus. Do you not want to use magic ever again?”
I clutched a handful of the bedsheets, my hands trembling violently.
It was such a humiliating, disgraceful moment.
But in this situation, I had no other choice.
To use magic freely again, I needed Sister’s phallus.
“Ugh… ph-phallus…”
“Hm? I can’t hear you. You have to say it loudly.”
“Phallus… p-please give it to me…”
“Are you just saying that?”
I bit my lip hard and lifted my hips high. I even used both hands to spread my pussy wide and shake it.
“S-Sister’s personal f-fucktoy… please give me your phallus… please… crush Runi’s womb… with your phallus…”
“Pfft, very good. I’ll screw you properly now.”
—Thrust!
“O-goh♥ Hng-ohhhhhh♥”
The moment I managed to choke out those words, Sister’s heavy phallus pierced straight through my pussy.