(Edited)
One hour later.
"Hahii, hyiin, ahn, aaahn! No, this is too much! My tits, my pussy, uughn, even my asshole... afuun! If you do all this to me, I'm gonna go completely crazyyy!!"
Already having cum an uncountable number of times, Rossweisse was now being fucked from behind in doggy-style.
Having taken Kazuki's cum into her womb five separate times, and without him ever pulling out once, her belly had swollen up like a pregnant woman's, swaying heavily with every thrust.
"Ahuh, ahn... I-I can't anymore, forgive me... Please, just let me rest... Aaaahnn!!"
Exhausted and completely pliant, Rossweisse was pounded mercilessly, Kazuki thrusting into her with relentless vigor.
"Here—if you want this to end quicker, then shake your own hips and make me cum!"
"Uhyii, hyin! Nn... L-Like this?"
Kazuki gave Rossweisse's ass a light smack to spur her on, and she slowly began to rock her hips.
"Nnn, ahn, ahn, haahn... Nnnn, is this good?"
Honestly, it was far from enough—but the sight of her long silver hair flying wildly, droplets of sweat scattering like pearls with each sway of her hips, and those colossal tits bouncing and jiggling obscenely was a feast for Kazuki's predatory eyes.
"Aah, I can't anymore... Please, Kazuki-san... Cum just like this. Dye my pussy, my heart, my body, everything—dye it all pure white with your cum!!"
At Rossweisse's desperate plea, Kazuki lifted her legs, spun her halfway around centered on his still-buried cock, and resumed pounding her furiously in missionary position.
"Aah, I can't, I'm cumming, I'm cumming again... Nnn, no, ah, aah! I'm CUMMING!!"
Spluuurttt! Spuurt! Splossh!! Splurrt!!
As Rossweisse climaxed, Kazuki pumped his load deep into her womb yet again. When his ejaculation ended and he pulled his cock out, the excess semen that couldn't possibly fit inside her erupted from her cunt with a vulgar, wet sound, like a volcanic discharge.
Perhaps because he'd been inside her for so long, the blood from her broken hymen had mixed with his cum, tracing faint pink lines.
What remained of his semen dripped and splattered down onto Rossweisse's face and body, painting her pure white.
'I can't anymore... I'm at my limit... If this continues every single night... I might not be able to endure it... I really will need... to cooperate with Rias-san and the others after all...'
Her entire body stained white, Rossweisse succumbed to her exhaustion and fell into a deep, dead slumber.
Having scored a KO against Rossweisse right on the heels of Artoria, Kazuki poured water from the pitcher on the side table into a glass and downed it in one go.
"Phew..."
The sensation of cold water seeping into his parched throat was pure bliss.
Finally catching his breath, Kazuki glanced down at his own manhood, still stubbornly asserting itself, and let out an exasperated sigh.
"Even I'm amazed... After shooting that many loads, it still hasn't gotten any smaller."
"Let me see? Whoa~, it's true. Not small at all. Still not satisfied?"
"Well, I'd say about seventy percent—wait, Sera-nee!?"
Finding himself suddenly caught from behind by Serafall, who had materialized at some point without him noticing, Kazuki practically leaped off the bed.
The night was far from over…
"Yahho, Kazu-kun... You're full of energy, huh? Very much so!!"
Serafall gazed at Kazuki's still fully erect cock and grinned with unmistakable satisfaction.
"Don't stare so much. More importantly, why are you dressed like that!?"
For some reason, Serafall was perched on the bed wearing nothing but a set of sexy lingerie.
"Hm? A girl comes to a boy's bed dressed in lingerie like this—there's only one reason, right? I came to have sex, obviously."
Serafall dropped the bombshell with complete nonchalance.
"Uh, um..."
"I mean, Kazu-kun's still not satisfied, and yet Artoria-chan and Rossweisse-chan have both already passed out cold. So it's finally Onee-chan's turn to step in, don't you think☆."
Kazuki was so thrown into disarray he couldn't find his next words.
"Or what, Kazu-kun... do you not want to have sex with Onee-chan?"
Even knowing that pleading with upturned eyes like that was absolutely cheating, Kazuki desperately averted his gaze and scrambled for an excuse.
"B-But, Nee-san, you're a Satan."
"Hmm, so a Satan's no good, huh... Even though you're fucking a Satan's wife..."
"Wha—!? How do you... know about that?"
The shock stole Kazuki's voice. Seeing him like that, Serafall burst out laughing.
"Ahahaha! Honestly, you can't do that, Kazu-kun. Falling for it that easily."
Hearing that, Kazuki's face went pale. 'Shit!'
"Got played..."
"The other day, I had a chance to have tea with Grayfia-chan. And I thought, wow, she's gotten so bright and beautiful lately."
"Bright? Grayfia-san, who barely changes her expression?"
"I've known her a long time, you know. I can tell even from tiny little changes. And then, when your name came up in conversation, that Grayfia-chan actually jumped right into the topic, and we had so much fun talking about it... It made me think, ahh, something must have happened between those two... So I did just a teensy bit of digging. Sorry."
'I messed up... I can't believe I fell for it so easily. I hate my own carelessness.'
"Ah... Nee-san? This matter, um."
"Of course I won't go blabbing about it. But since it's a bit of a scandal, I'd like you to tell me how it ended up that way."
With things having come this far, there was no helping it. Kazuki began recounting the whole chain of events between himself and Grayfia.
"Hmm, I see..."
After hearing how Kazuki had come to be involved with Grayfia, Serafall sank into thought for a moment.
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