The alarm on Kazuki Fuwa's phone rang, pulling him awake. He had fallen asleep around 4:30 AM, just as dawn began to break.
Though he'd managed roughly two hours of rest, exhaustion still clung to him.
His gaze drifted to Yumi sleeping peacefully beside him.
Her serene face looked softer, almost childlike, compared to her usual demeanor. The previous night, he'd pushed her far too hard.
Lost in the frenzy of his first sexual encounter since reincarnating, Kazuki had been reckless—especially since it was Yumi's true first time.
Yet, he couldn't fully regret it. A beauty like Yumi, with her flawless features and innocent allure, was someone he'd never even dreamed of touching in his past life.
The memory of her writhing beneath him, moaning uncontrollably, made his morning erection throb even harder.
"Nn… uun…?" Yumi stirred, her eyelids fluttering open as if sensing his stare.
"Good morning!! How's your body holding up?" Kazuki asked, his voice low.
"Ah… Good morning, Kazuki-senpai… Senpai…?" Still half-asleep, she blinked at him in confusion.
But then—
"～～～～～!!"
The memories of last night flooded back. Her face flushed crimson, and she yanked the bedsheet over her head, hiding entirely.
"Hey… Yumi? What's wrong?"
"～～～～～…"
No reply. She was clearly drowning in embarrassment. But Kazuki Fuwa wasn't one to let her off easily.
"Did you… forget what happened last night?"
'N-No, I remember everything!!' Yumi recalled every lewd detail—that was why she couldn't face him.
"Even though you were the one who seduced me?" he added, teasing her further. Her body twitched sharply under the sheet.
"Or how you came untouched when I filled your pussy with my cum—even though it was your first time?"
"～～～Huuk～～～" Another jolt, harder this time.
"Or how you drooled and begged, 'More… more…' while riding me yourself?"
"I-I didn't do any of that!!"
Yumi shot upright, protesting indignantly—only for Kazuki to seize her.
"Got you." He pulled her tightly against his chest.
"S-Senpai, you're mean!"
"Mean works!! No need to be shy. You were adorable."
"Uuuu~~…"
She grumbled but gradually relaxed as he stroked her back, her face buried in his warmth.
"Calmed down now?"
"…Yes. I'm sorry, Senpai. I… got carried away…"
When she finally looked up, her cheeks still burned pink.
"Don't worry. It's natural. But seriously—are you okay? Any pain?"
"Huh? Oh… I'm a little sore, but… I'll manage. Probably."
"Hmm… Then maybe this is too much?"
"Too much? What do you— Hyaaaah!?"
Yumi's eyes dropped, and there it was. Kazuki's thick, rigid cock stood fully erect, veins pulsing.
'Eeeeeek!? S-Something this huge was inside me…!?'
Last night, even after multiple climaxes, Kazuki's stamina never wavered.
He'd kept cumming inside her pussy until she passed out, meaning this was her first real look at his monstrous size.
Yumi gulped audibly. Her hand trembled, instinctively reaching toward him—
"Yumi. Let's shower first."
"Eh? S-Senpai…?"
Ignoring her flustered stammer, Kazuki guided her to the bathroom.
And then───
"Haah, ahn! Senpai, there...!"
Kazuki was washing Yumi's body, which was covered in soap suds, with his bare hands. It was inevitable that he would touch various places while washing her. With that excuse, Kazuki caressed Yumi's body all over.
From behind, he kneaded her ample breasts. While they weren't as large as Rias's or Akeno's, they were still more than enough to be considered big, and the sensation of squeezing them, though still slightly firm at the core, gave Kazuki an exquisite feeling.
"Does it still hurt?"
"Haa, nn! The pain... it's mostly gone, but..."
"But what?"
"Nnnn!... I-it's a weird feeling like something's tingling up my spine... haahn!!"
As Kazuki teased her stiff, pointed nipples, Yumi let out a moan.
"That's what it feels like to cum, Yumi."
"T-to cum...? This is... ah, ahhh!"
"That's right. Just let it out, let your voice go, let everything out. You'll feel even better."
"E-even better...?" Yumi gulped.
She was already burning with an unfamiliar pleasure, and if it was going to feel even better than this, she wondered what would become of her. Yumi's heart wavered between fear of the unknown and curiosity.
Eventually…
"Ah, ahh, it feels so good! Senpai, more, do more! Touch Yumi's breasts more───!!"
Perhaps curiosity got the better of her, as Yumi began to voice her feelings openly. Encouraged by her voice, Kazuki inserted his finger into Yumi's vagina.
"Ahhh! Senpai, there... you can't, nnnn───!!"
From within her pussy, the remnants of last night's activities and her own juices created a wet, squelching sound that heightened the sensuality between the two.
"Yumi!! Do you know what this is called?"
"Huh? H-here is... haa, nnn!?"
"If you don't know, I'll tell you. It's called a pussy."
"A... a pussy...?"
"That's right. So next time you cum, say───"
"T-that's... impossible!!"
"You can say it, right, Yumi?"
"Uuu…. Yes, I'll."
"Good girl."
After teaching Yumi something, Kazuki kissed her from behind as a reward for her consent.
"Ah, nn, Senpai... chu, mmmph..."
"Alright, let's go then?" With that declaration, Kazuki quickened the movement of his fingers.
"Ah! Ah! Ah! Senpai, Senpai!!"
Using his index and middle fingers, Kazuki delved into Yumi's vagina. It was overflowing with her juices, readily accepting his fingers without resistance. Kazuki didn't just move them in and out; he twisted his wrist, rotating his fingers like a drill, stimulating Yumi's insides.
"Ahhhh! Senpai, Senpai! I'm, I'm already───!!"
Exposed to such intense movements, Yumi was on the verge of reaching her limit.
"That's it, Yumi, come like I taught you!"
"Y-yes!... I-I'm cumming! Yumi's pussy, feeling so good because of Senpai, I'm cumming, aahn, I'm cumming───!!"
PUSHAAAAAAH!!
PUSHAAAAAAH!!
She squirted a large amount of fluid, reaching her climax.
"Ahhhhh───!!" With a loud moan, Yumi collapsed on the spot.
Before Kazuki's eyes was the voluptuous Yumi Kiba, her ass raised high. Her groin, as proof of her climax, dripped with a copious amount of her juices, and her tight pussy entrance opened and closed as if inviting Kazuki in.
Seeing such a sight, Kazuki was far from unaffected.
Supporting himself, already in a state of readiness, he aimed his thick cock at Yumi's quivering pussy, which seemed to beckon him.
THRUSSSTTT!!!
And without waiting for Yumi's consent, he thrust in all the way to the hilt in one go.
"Ohoooohhh~~~~!!" Yumi let out a strange cry as she climaxed once more.
The tight, firm walls of Yumi's pussy seemed to have loosened considerably from their lovemaking since last night.
While the sensation of tightness remained, what was once painfully constricting had now become pleasurably snug. Kazuki took this as a sign that Yumi's body had fully accepted him, and spurred on by this joy, he quickened the pace of his thrusts.
"Ah! Ah! Ah! Ah! Senpai, Senpaaai~"
"That's it, Yumi! Let it out! Be honest with your feelings, let your voice rise with your pleasure!!"
Slap! Slap! Bang! Slap!
The sound of flesh meeting flesh and the mingling of their moans echoed loudly through the morning bathroom.
"Senpai! It feels so good!"
"Where? Where does it feel good!?"
"Nnhaaah! D-deep... deep inside feels so good!"
"Deep? Like this!?"
Kazuki pulled out almost completely, then thrust back in with force, aiming for the deepest part of her pussy. The firm resistance against the tip of his cock told him he had reached her cervix.
"Ahhhh!! That's it, yesssss!!"
The tip of Kazuki's cock pressed against Yumi's cervix.
Splashhh!!
The impact caused Yumi to squirt once more.
"~~~~~~~~~~~~!!"
Yumi let out a soundless scream as she reached yet another climax, losing count of how many times it had been.
"Haah, haah, haah, haah..."
Breathing heavily, Kazuki observed Yumi. Though she was clearly exhausted from being brought to climax so many times since last night, her vaginal walls still tightly gripped around his dick, pulsating as if begging for more.
As Yumi grew more radiant with each climax, Kazuki gulped audibly.
"Haah, haah, haah... ah, nn, Senpai..."
Kazuki stroked Yumi's smooth buttocks, drawing her attention back to him.
Slap!!
"Haaahhnn~!!"
He began thrusting into Yumi's depths once more.
"Senpai! I can't take it anymore!? If you keep going... I'll go crazy!!"
Ignoring her cries, he relentlessly pounded against her cervix, as if trying to mold her insides to his shape.
"Senpai, Kyaaaaaaah! I'm cumming! Yumi's cumming agaaain! I've been cumming the whole time ahhhhhhhh!"
Meanwhile, Yumi, having just climaxed and not yet come down from her high, was thrust back into a continuous state of orgasm. In this state, everything felt overwhelmingly pleasurable, and she could only submit to Kazuki Fuwa's relentless pace.
In the doggy-style position, Kazuki gripped Yumi's breasts and continued to shake his hips vigorously.
"Ah! Ah! Nnnn! Hyyaaaahhnn!!"
"Yumi, Yumi! That's it, your pussy feels so fucking amazing!!"
"Senpai! Me too! Your cock feels so good inside me!!"
Slap! Bang! Slap! Slap!
"Yumi! Yumi! Yumi!!"
"Senpai! Senpai! Senpai!!"
Her womb was pounded relentlessly, and Yumi squirted repeatedly, her climax unending as she continued to orgasm. Her face, slack with ecstasy, radiated a sensuality unimaginable for a seventeen-year-old girl.
The bathroom, once fragrant with soap, now reeked of mingled sweat and the pungent odor of sex. The thick, primal scent only heightened their arousal.
"Fuck, Yumi! I'm close…! I'm gonna cum…!"
"Yes! Cum inside me! Fill my pussy with your semen, Senpai…!!"
"Yumiii!!"
"Nnnaaaaahhhh~~~!!"
Splurt! Splurt! Spluuurt!
Kazuki's cock, pressed deep against Yumi's cervix, erupted violently. Thick, hot streaks of white shot into her insides with such force it seemed intent on reaching her very core.
"Ahhn! So… hot… filling my belly…"
Overwhelmed by the most intense climax she'd ever experienced, Yumi trembled as she felt Kazuki's heat flood her from within.
Then, blissfully, she collapsed into unconsciousness…
Yumi Kiba was a beauty so striking that every head turned when she walked down the street.
Though countless men (and women) had confessed to her, she'd never shown interest in romance. Her resolve to protect Rias as her loyal [Knight], coupled with her burning hatred for the Holy Swords, left no room for love.
Yet Yumi's defenses crumbled for Issei. Though infamous at school as one of the "Pervert Trio" (and rightfully so—he'd once peeked at her changing), as a fellow servant of Rias, she found him unexpectedly earnest. His habit of staring at her chest was irritating, but his heart was true.
That's why she'd defied Rias to help him and Koneko rescue Asia. But the mission failed. Asia died, triggering Issei's awakening as the Red Dragon Emperor.
After he defeated the fallen angel Raynare, Asia was reborn as Rias's [Bishop], and all seemed resolved—or so it seemed.
However, Raynare escaped, resulting in a new victim. Yumi's classmate, Kazuki Fuwa. By the time Yumi's group tracked Raynare down, Kazuki was already seriously injured and was on the verge of losing his life.
Rias destroyed Raynare on the spot and saved Kazuki by reincarnating him as a devil using an [Evil Piece].
Until the Rating Game against Riser Phoenix, Kazuki had been a quiet, unremarkable presence. But that game shattered everyone's perceptions.
His incredible martial arts skills and the power of that [Guyver], which served almost as a sacred gear or even more, allowed him to annihilate four of Riser's servants in seconds.
Even Yumi, who witnessed it firsthand, struggled to believe it. This was no ordinary high schooler. 'What life had he lived to fight like this?' For the first time, Yumi felt curiosity—no, desire—toward a man.
However, after the game, Rias showed more interest in Kazuki than her. Determined to support her master's budding romance, Yumi buried her own feelings.
Yet his actions again during the Holy Sword incident—protecting her when she tried to leave Rias's peerage, helping her rediscover her bonds with her comrades, reclaiming their crystallized unity—all struck Yumi's heart.
Before she knew it, the feelings she'd suppressed had bloomed into full-fledged love.
Though she acknowledged her emotions, Yumi, with zero romantic experience, had no idea how to act. Overhearing classmates gossip about their boyfriends, she resolved to confess. To her surprise, Kazuki accepted her feelings.
That same night, she gave him everything.
Having lost her virginity less than ten hours prior, a complete novice who'd never even masturbated, Yumi endured Kazuki's relentless, almost cruel passion.
However, even as he claimed her body, she welcomed his semen deep inside her pussy, drowning in euphoria unlike anything she'd ever known.