The very next day, it happened again. I didn't even bother hiding my illicit relationship with my sister anymore.
Instead, I invited her straight to the villa where Arisu and I had been living together.
The moment she arrived, I fucked her, enjoying every bit of the forbidden thrill.
I alternated between the two of them, taking turns. One moment I was balls-deep inside my sister, her body trembling under me as I made her moan my name, and the next moment I had Arisu spread wide, gasping as I pounded her.
I didn't bring them together just yet, though, making them acknowledge each other's existence would take time, patience, and a little corruption.
That, I was already working on.
But it didn't take long before Arisu couldn't ignore it anymore.
She heard the sound of my sister's cries echoing through our supposedly private house, those shameless moans that made her grit her teeth.
"Takashi-kun," she hissed, biting down on my finger with frustration as I teased her, "you're getting more and more attached to your sister, and shamelessly brazen about it too."
Her tone was laced with anger and jealousy, her eyes sharp even as her lips trembled. "One day, if you keep playing with women like this, you'll die in their hands."
"Shouldn't that sound romantic to you, Arisu?" I chuckled, amused at her words.
To me, the possibility sounded more like a twisted form of poetry than something to fear.
In my past life, without the system, I might have panicked at the mere thought of dying.
The fear of being killed, of death itself, would have haunted me.
But now?
With the system in my hands, with the ability to travel across the multiverse endlessly and power that far surpassed anything humanity could ever touch, the probability of me dying was laughably small.
Whether the system had lied or not about not being a creation of some God didn't matter to me.
What mattered was whether the system was useful to me or not. And so far, the system had already fulfilled its promise, giving me exactly what I asked for. That alone was the only measure of trustworthiness I needed.
If the system or whatever cosmic bastard was pulling the strings behind it was lying, then so what? It would still be an honor in itself. Think about it: a being that stands above creation, an omnipotent existence, lowering itself to spin lies at a mere mortal like me… that's already a hell of an achievement for something as insignificant as us.
But if the system was telling the truth? Even better. Then everything works out, everyone gets what they want, and the game continues. Simple as that.
At my words, Arisu narrowed her eyes at me.
But instead of anger, her gaze softened, carrying a strange compassion mixed with resignation.
"Well," she sighed, brushing her hair back, "if you can't control your lust, it can't be helped. Let me, as your girlfriend, take responsibility and help you manage that lack of self-control."
Then her lips curved into a dangerous little smile as she leaned closer. "How about this, why don't you call your sister here, openly? No more sneaking around. She needs to know who the real girlfriend is, and who the queen in this relationship will always be."
I was surprised at her words, but at the same time, they made perfect sense.
After all, with the power of normality, incest had become just another part of everyday life.
She didn't hesitate, didn't even flinch at the word "incest," and certainly didn't shy away from the implications of it.
To her, there was nothing shocking about it, nothing forbidden, just a natural extension of love and desire.
Because in this twisted normality, every act that would have been called sinful or perverse, every lustful touch, every forbidden urge toward my own sister became nothing more than something accepted, even natural, in the eyes of anyone who saw or heard.
What would have once been a scandal was now no different from holding hands or kissing in public.
Of course, that privilege belonged only to me. If anyone else dared to commit the same, they would be cast out, slapped across the face by society, isolated, and condemned.
"Let's call her tomorrow," I said finally, accepting her suggestion as I let a wretched smile curl across my face.
I slid my hand beneath her chin, tilting her beautiful, delicate face upward until her eyes met mine.
Her cuteness mixed with the subtle trembling of anticipation, and it only made me want her more. "But for now… let's enjoy our time together, shall we?"
"Uhm…" she whispered, voice soft, almost shy, and that was enough to push me over the edge.
I didn't waste another second.
She didn't resist when I leaned forward, capturing her lips with mine, devouring her mouth in a deep, wet kiss.
I pressed her backward, pushing her down onto the bed until she was lying beneath me, breathing harder with every passing second.
Her legs parted obediently, spreading open for me as if her body already knew what was coming.
I slid her panties down, exposing her slick pussy glistening under the dim light, while at the same time I shoved down my trousers, my cock springing free, thick and hard, throbbing with need.
I didn't waste time.
Guiding myself between her thighs, I pressed the tip against her entrance, then pushed inside, stretching her tight walls as she gasped beneath me.
Her pussy wrapped around me, clinging and pulsing as I sank deeper with each thrust, filling her completely.
Her moans filled the room, her nails raking against my back as I moved faster, fucking her hard, every slap of skin echoing as our bodies collided again and again.
The bed creaked beneath us, the rhythm growing rougher, more desperate, until the world outside stopped existing
Time blurred as the night stretched on.
Again and again, I drove myself into her, claiming her in every way I could, until sweat covered our bodies and the sheets clung damp against our skin.
We didn't stop until exhaustion finally overtook us, leaving us sprawled together, panting, drenched, and satisfied.
And in that exhaustion came a strange sense of renewal, a feeling of being refreshed, purified almost, through the intensity of our shared lust
When we woke up, still tangled in each other's warmth, she suddenly spoke up, her voice sharp yet laced with suspicion. "Fuuka Kiryuuin suddenly being declared as your fiancée… is this also your doing, Takashi-kun?"
I tilted my head and looked at her, slightly amused by her directness.
"Where did you hear this from?" I asked calmly.
After all, the news wasn't even public yet.
It would be announced soon enough within a week at most.
Invitations would spread through high society gatherings, and Fuuka would be allowed to leave the academy temporarily, despite the rules that bound students to stay until graduation.
Arisu's eyes narrowed with suspicion. "It's no longer a secret. The business deal, the sudden alliance, the meetings between the Ichinose patriarch and the Kiryuuin patriarch, all of it is already clear. They didn't even bother to hide the fact they were forming an alliance."
Her voice wavered with resentment as she bit her lip. "You told me I would be your queen, your wife. Takashi-kun… do you intend to break our promise? Do you want to betray our contract?"
I reached out, touching her cheek, and replied without hesitation. "No. Whether that proud woman likes it or not, you will be my wife. She is nothing more than a lover, a mistress, a concubine. You are my queen."
Her tense expression softened instantly, replaced by a sweet, almost wicked smile.
Her eyes glimmered with satisfaction as if she had been waiting for those words.
"Then, as a reward…" she whispered, sliding closer until her breath tickled my lips, "call your sister, Takashi-kun."
"Tonight, I will allow both of you to sleep together in my bed. If you wish, the three of us can make love however you find convenient, all night long." Her hand slid down beneath the blanket, wrapping around my cock.
She stroked me slowly, teasingly, her fingers squeezing the shaft as it hardened in her grasp.
Her words, paired with the heat of her touch, made my body react instantly.
My cock swelled and twitched with anticipation, aching for more.
Arisu lowered her head, kissing the sensitive tip of my erection, her tongue darting out to taste the precum already dripping there.
A soft moan escaped her throat as she wrapped her lips around me, taking my cock into her mouth, sucking me with deliberate slowness as if she wanted to savor the moment.
The pleasure made my breath catch, and even as I gasped, I picked up my phone with one hand, already dialing Honami.
Arisu glanced up at me with her lips still wrapped around my shaft, her eyes full of lust and mischief, as if daring me to follow through.
I smirked down at her, stroking her hair as her head bobbed along my length while I talked to my sister.
And so, I invited my sister into the room, ready to share a night of forbidden pleasure, a threesome that would bind us in ways no promise, no contract, and no alliance ever could.
...
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