"Okay, good work, everyone."
"W-we're done... ..."
Perhaps it was a testament to her instruction; the report was completed in about an hour. Exhausted, Kazuki and Artoria were slumped face-down on the desk.
"Kazuki... I will propose that in the future, you should recruit someone skilled in paperwork for your peerage."
"...I agree."
A wry smile escaped Grayfia at the sight of the two of them.
"Well then, I'll go put these materials away."
As she moved to tidy away the books she'd used as references,
"Ah, let me help. Artoria, you can rest a bit longer."
"I'm sorry. I'll take you up on that offer..."
Artoria was still slumped over. It seemed she had discovered the unexpected weakness of the King of Knights.
"Well then, shall we go?"
Kazuki easily lifted a mountain of books.
And so, the two of them tidied away the books. They repeated the process of Kazuki carrying the books and Grayfia guiding him to the bookshelf to put them away, until only three books remained.
"Grayfia-san, you've been a great help to me, so I'd like to thank you. What would you like?"
He suddenly asked such a question.
"A thank you...?"
"Yes. Anything within my power is fine, but is there something you'd like?"
Hearing 'anything', her heart skipped a beat. She involuntarily swallowed and asked back.
"Anything... is fine?"
"Yes. As long as it's within my power."
"It's fine. It's something only you can do."
Her eyes glinted bewitchingly.
"Wha— Grayfia-san!?"
"Don't move. Stay still."
The books she was holding fell, hitting the floor with a heavy thud. Grayfia pressed Kazuki against the bookshelf and knelt down on the spot.
Pulling down the zipper of his trousers, his still-soft member flopped out.
"Oh my? Ufufu, how cute... It's hard to believe this becomes so fearsome..."
Grayfia gently stroked his penis as if it were a treasure, then sniffed at it, her nostrils flaring. Caressed by Grayfia's slender fingers, Kazuki's member began to stiffen.
"Grayfia-san!? What's gotten into you all of a sudden!?"
"...It's not sudden at all. I've wanted to do this with you, Kazuki, for a long time."
Ignoring the bewildered Kazuki, Grayfia began to stroke his member. Stimulated by her touch, it swelled until it could truly be called a cock. At its imposing sight, Grayfia let out a sensual sigh.
"Ahh... Wonderful, Kazuki. Now then— Ahhmmm."
"Nngh, aahh, G-Grayfia-san!"
Taking his cock into her mouth, Grayfia skillfully used her fingers, tongue, and lips to lick, suck, and stroke it.
"Hmmph, hnn, slurp, mmm... Ghhhrr, nghhmmghh... mmm... lelelele... nnfuh, nnmmuh, mmm... slurp slurp... splosh, hmmm... sllurpo! ...nghaa... ufufu, it's gotten so big... there's juice leaking from the tip. Does it feel good, Kazuki?"
Kazuki's cock was fully erect, and pre-cum was leaking from the tip. Coated in Grayfia's saliva, it twitched and trembled as if to show how good he was feeling.
"Nghaa... i-it feels good..."
"Ufufu, I'm happy !... Kazuki, let me make you feel even better with my mouth."
Pleased with herself for making Kazuki feel good, Grayfia began to assault his cock even more fiercely.
She ran her tongue along the shaft, worked the head with her lips, lapped up the pre-cum, ran her hand over his balls, and rolled them in her palm. Under Grayfia's intense blowjob, Kazuki was reaching his limit.
"Nghah!? Grayfia-san, I'm gonna cum—"
Grayfia responded to his warning by increasing her pace.
"Bfuuh! Mfuh! Fuhn! Umuh!"
As lewd, wet sounds that struck straight at his primal instincts echoed, Kazuki grabbed Grayfia's silver hair and began thrusting his hips roughly. And then,
Splurrt! Spurt! Sploshh—!!
He burst inside Grayfia's mouth.
"Gulp!? Splurt, nnfuh... mmm... Gokun, Gokun... nghaa, so thick... ufu, you came so much for me. Did it feel good?"
"Y-yes..."
Watching Grayfia wipe her cum-stained mouth with a handkerchief, Kazuki collapsed onto the floor as if falling on his rear. Grayfia stood before him and lifted her skirt.
"Look, Kazuki. My pussy has gotten like this... so please... I want you to plug it with your cock, no, your dick..."
Staring at Grayfia's crotch, Kazuki caught his breath. Her exquisitely designed, high-class underwear was soaked with her nectar, the silver pubic hair and the outline of her womanhood visible through the fabric. The smell of a woman, no, a female in heat, assaulted his nostrils, making his head spin.
Suppressing the urge to plunge into her right away, Kazuki spoke to Grayfia.
"...I can't do that. Doesn't Grayfia-san have a master, Lord Sirzechs? If you want to do something like this, the proper thing would be to seduce him, right?"
At his perfectly reasonable objection, Grayfia's face clouded over.
"...It didn't work."
"Huh?"
"I thought my frigidity was cured after that night, so I slept with Sirzechs, but I didn't feel a thing... But just remembering sleeping with you makes my pussy wet, and when I do it myself, it feels good... but just my fingers isn't enough... My body has become strange. Kazuki, my body has become so that only you can make me feel it! So please, have sex with me!!"
Kazuki's heart pounded at Grayfia's confession. What Venelana had asked of him that night was to sleep with Grayfia, who was suffering from sexual frustration, and satisfy her heart.
So that night, upon learning of Grayfia's frigidity, he had poured all his effort into resolving it. Part of it was a pure desire to help Grayfia, but there was also the ulterior motive of wanting to sleep with a woman as exquisite as Grayfia.
He had dismissed it as a fond memory of a single night and tried not to be self-conscious whenever they met afterward, yet she had apparently been conscious of him all along.
He found that honestly pleasing, but Grayfia was a married woman, the wife of a Demon Lord. If he were to give in to her pleas and sleep with her again, wouldn't that be a betrayal of Sirzechs, Millicas, and above all, Rias?
'What... should I do...?'
As he racked his brains, Grayfia's lips met his.
"Nn— chuup... Kazuki, don't overthink it, just answer me one thing... Don't you want me?"
Asked this, Kazuki questioned himself.
'No... It's not 'what should I do'. It's 'what do I want to do'! I... what do I want to do with her? What do I want to become with her?... I... I want her! I want to conquer her, body and soul, and make her my woman! That's right, I couldn't forget that night either!'
The sensual night he had spent with Grayfia, one of the most beautiful MILFS in the Underworld, replayed in Kazuki's mind.
Making up his mind, Kazuki was the one to press his lips to hers this time.
"Nnn!? ...nn, kiss, ahh, Kazuki..."
"Slurp, Grayfia-san... no, Grayfia. I want you. I'm going to make you my woman."
Kazuki Fuwa declared clearly. Grayfia's face showed surprise for a moment, then broke into a blissful smile.
"Yes. Please make me your woman."
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