Serafall's tongue moved like a living creature, slithering across Kazuki's lips, tangling with his tongue, tracing his teeth, pouring in her saliva. With each movement, wet, lewd slurping sounds filled the air.
As Kazuki gulped down her saliva, he refused to be outdone, tangling his tongue with hers. While kneading Serafall's beautiful breasts, he gently rocked his hips, still buried deep inside her pussy.
"Ahn! Honestly, starting to move all of a sudden—so unfair. I said I'd do you, remember?"
She winked, then placed her hands on his shoulders and began moving herself.
At first, slowly, back and forth... then side to side. As if gradually getting used to it, she started rotating her hips in circles, clamping down on his cock with a tight squeeze of her vaginal entrance and expertly milking him.
"Haaah, nnn How is it, Kazu-kun? Does it feel good?"
"Kh... ahh... Nee-san's insides clamp down so tight—feels so amazing. Nee-sa—mngh!?"
Serafall sealed his mouth with a kiss, sliding her tongue inside. With obscene, wet sounds, their tongues entwined, exchanging saliva as she smiled happily.
After sharing a passionate kiss for a long while, she pulled away with a satisfied expression.
"Ufufu, I'm so happy. It feels amazing for me too. Kazu-kun's huge cock—so hot, so hard—it reaches all the way deep inside Onee-chan. Hey, move more. Let my pussy make you feel so, so good... and then shoot out loads and loads of your cum."
Serafall smiled with a breathtaking, sultry allure.
At this never-before-seen seductiveness, Kazuki swallowed hard. Making up his mind, he lifted her buttocks until his cock was on the verge of slipping out entirely—and then let go.
Baang!!
"Higuhhh!!"
Obeying gravity, Serafall dropped down, and his cock rammed deep, deep into her depths. The strike reached all the way to her womb, sending her skyrocketing straight into climax.
Letting out a soundless scream, Serafall's body convulsed in violent spasms as she slumped against Kazuki. The sensation of something hot spreading across his crotch told him she'd wet herself again.
"Sera-nee, you okay?"
Her consciousness seemed hazy; though her eyes were open, she didn't respond when he called her name. Yet her pussy quivered minutely, clamping down on him with exquisite tightness.
Unable to hold back any longer, Kazuki laid her down on the bed, hoisted her legs up into a piledriver position, and resumed his relentless pistoning.
"Ah-hii Ah-ohhh W-Wait—Kazu-kun! Not right now, wait! Aaahnn!!"
"Not waiting."
Ignoring her pleas, he slammed his hips into her with brutal force.
"Higun! Ha-ohhh! I-It's impossible! I've been cumming nonstop—if you go any more, I'll go crazyyy!!"
Constantly exposed to the peak of pleasure, Serafall's entire body was slick with sweat, and with every thrust, she let out a hot, wanton moan.
"Nnmu... Kiss... Nnah, I love you. Slurp slurp… I love you! Kazu-kun, more... Do it more. Fill up Onee-chan's pussy with Kazu-kun's hot, thick cum. Get me pregnant with your sperm, Kazu-kun, my beloved! I'll give birth... Onee-chan will give birth to Kazu-kun's baby!!"
"Yeah... I love you too, Nee-san! I'll cum inside you just like you want and knock you up!!"
Driven by Serafall's debauched cries, Kazuki entered his final sprint. With each deep, piercing thrust, his cock reached farther than the deepest part of her pussy—sinking all the way to her womb as the final moment approached.
And then—
"Oooh! I'm cumming!!"
"Aah! Aah! Aaaaaaaaaahhhhh!!"
Splurrrrt! Splurt! Splurrrrrt!!
"I came... I came so hard... No more... It's coming out again... Again... ah... aaaaaahhhh."
PShhhhhhhh—
Serafall lost control of her bladder once more in climax.
There was no more anguish, no more regret on her face. Only the joy of having her own perversion accepted, and the twisted pleasure of soiling the one she loved.
"Aauuu."
After their lovemaking had ended, Serafall buried her blushing face into Kazuki's chest and let out a low moan.
"What's the matter, Sera-nee?"
"Hauuu... I went and made such a complete spectacle of myself... Uugh, I'm so embarrassed. I wish I could just crawl into a hole..."
Serafall, writhing in shame, was so adorable that he hugged her tight and planted a kiss on her forehead.
"I was happy, you know. That you let your emotions all the way out, and that you wanted me so badly."
"Kazu-kun..."
"You'll have my baby, right?"
When he whispered, she smiled a beautiful smile.
"Yeah. I'll have it for you. No... that's not right. I want to have Kazu-kun's baby. As proof that you loved me..."
Their faces drew together naturally. But just before their lips could meet, Kazuki was yanked backward by his body.
"That will not be happening. I will be the first to bear Kazuki's child."
"Yes! And besides, today was supposed to be my day—so why is Serafall-sama having sex with him!?"
Turning around, he found Artoria and Rossweisse—who had apparently recovered at some point—standing there.
For an instant, Serafall stared dumbfounded. Then, grasping the situation, she flashed a smug, provocative grin at the two of them.
"Ehh? But, Artoria-chan and Rossweisse-chan, you both got K.O.'d before Kazu-kun could even be satisfied, right? When that happens, it's Onee-chan's turn to step up, isn't it?"
"I-I was merely taking a short rest! It is my duty as his servant to attend to Kazuki! Even if you are a Satan, I must ask you not to interfere!"
"And I was simply basking in the afterglow! Tonight was the night Kazuki-san and I sealed our contract and became one. Yet when I open my eyes, I'm shoved aside to the corner of the bed with Artoria-san while you monopolize him the whole time—this is just too cruel!"
"Hah!? Artoria-chan, no matter how legendary a Knight-King you were, right now you're nothing more than a single Low-Class Devil. You've got some nerve defying me, a Satan. And Rossweisse-chan? I gave you a proper chance, didn't I? But you went down so quickly, didn't you? You've got no grounds to complain to me!"
"Ugh... W-Well, it couldn't be helped! It was my first time!!"
"Hmph. My first time with Kazuki was the same as yours. More importantly, Serafall-sama, if you're finished, please vacate that spot immediately. That place belongs to me."
"Ehh, no way. I still wanna do more with Kazu-kun."
"It's not 'no way.' In any case, now that I'm awake, it is my duty as his Queen to attend to Kazuki... Besides, Kazuki says I'm cute... and he comes at me like a wild beast..."
Artoria's cheeks flushed pink.
"Wait just a moment! If that's the argument, I am his contracted partner! And besides, Kazuki-san said our compatibility was wonderful... Even though it was my first time, he came inside my womb again and again..."
Rossweisse squirmed, her hips fidgeting shyly.
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