Chaldea Subjugation Organization (Fate/Grand Order)

A/N: This story is one of my older still running commissions. Started back in 2017, it has updated pretty regularly ever since. It will update whenever the commissioner has me write another chapter going forward.

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It was one thing to actually be chosen by Chaldea in order to become a Master candidate… it was another thing entirely to be summoning his first true Servant. Shigure Kawashima grins wickedly as he stands there, watching as the Saint Quartz goes to work and brings his very first Servant into the world. A blinding bit of light later, and she stands before him.
 
Shigure is… stunned for a brief moment by the beauty of the heroine in front of him. Her outfit is downright scandalous and he can’t help but stare at her barely covered body, even as the swordswoman kneels at his feet.
 
“Greetings my Lord. I am Ushiwakamaru and I shall serve you as a samurai with my whole heart.”
 
A samurai, hm? Frankly, Shigure thought the Servant looked more like a whore than anything else. His body was already responding to her lack of clothing in a very noticeable way, his pants tenting. Ushiwakamaru notices this as she looks up at him, but she does not comment and he’s not sure whether it disgusts her, arouses her, or angers her in the end. Still, if she is to serve him with her whole heart…
 
“You will follow my instructions to the letter then?”
 
The Servant cocks her head to the side.
 
“I will my Lord, it is my duty to obey you in battle against your enemies.”
 
Licking his lips, Shigure glances down meaningfully at his visible bulge.
 
“And what about outside of battle? Isn’t it your duty to obey me in all things?”
 
Ushiwakamaru’s eyes drift down to where he’s looking and the faintest of blushes spreads across her cheeks. Ultimately though, she looks back up with that same blank face.
 
“I’m not sure what you mean my Lord. I am a samurai, a weapon. My only place is on the battlefield, there is no other use for me.”
 
It’s obvious that he’s going to just have to come out and say it. Grinning a bit perversely, Shigure gestures to his crotch.
 
“I wouldn’t be so sure Servant. Your outfit has aroused me, and I order you to pleasure me to completion.”
 
The heroic spirit’s eyes widen, and she finally stands up from her kneeling position. Her hand drops to the handle of her sword as she shakes her head.
 
“I think not my Lord. It would be inappropriate for a vassal to have relations with her lord. Please do not press this.”
 
It’s obvious that pressing it in the normal way would end poorly for him. But Shigure has another trick up his sleeve now, doesn’t he? He’s a Master with an actual Servant under his belt. Licking his lips, Shigure glances to his Command Seals… and then, irritated by her rejection and horny because of her body, he invokes one on his new Servant.
 
“By the power of my Command Seal, I order you to get on your knees and worship my cock!”
 
The Command Seal flares and Ushiwakamaru’s eyes widen even further, but the effects of the order hit her, and she cannot fight it. The scantily clad samurai slumps to her knees right in front of him and Shigure grins as she shuffles forward, her hands reaching for his pants. Even as she fishes his member out of it’s tight confines, the heroic spirit’s eyes shift up to meet his.
 
“My Lord… your cock is truly magnificent.”
 
Shigure smirks as her small hands strokes up and down his sizable length.
 
“Well thank you slut. Now, get on with it.”
 
Ushiwakamaru moans as she nuzzles his shaft, rubbing her cheeks up against his cockhead as it drips with precum. Her hands are not unskilled, but it’s clear she hasn’t jacked off too many cocks before this.
 
“Mm, yes my Lord… thank you for this chance to worship your majestic member. Thank you for gracing your unworthy servant with this awe-inspiring cock.”
 
Her tongue slips out from between her lips and she laps at Shigure’s prick cutely. Her eyes never leave his, and he watches on with a massive grin on his face even as she continues her work.
 
“Your dick is so thick, so nice and juicy. I want it my Lord, I want it inside my mouth. I want to suck on your huge, girthy meat-rod.”
 
Shigure doesn’t imagine that the female Servant knew most of these words before he used the Command Seal. Truly, that was some powerful magic. Still, her vocal worship of his length certainly has an effect. He’s throbbing painfully by the time Ushiwakamaru takes his cockhead into her mouth, sliding her lips onto it and swirling her tongue around the tip of his member.
 
“Fuck that’s good…”
 
It seems the Command Seal has given her some skill in order to make her worship worthier of his member as well, because Shigure is pretty sure a samurai, even a female one, is not trained in the level of nob gobbling that the heroic spirit is performing on him now. Ushiwakamaru’s eyes are still locked with his, even as she goes further and further. Her head bobs back and forth and inch after inch of his thick prick disappears past her lips, until finally he reaches the back of her throat.
 
The servant gags for a second on his cock, pulling back and finally turning her gaze towards the massive shaft between her lips. Her brow furrows in concentration and she glares at his member as if its personally offended her… or as if it’s a challenge for her to overcome. Her eyes crossed, Shigure’s first Servant gets to work on truly worshipping his cock, as she’s been ordered.
 
“Gagkh… gagkh…. gagkh…”
 
Going slowly, Ushiwakamaru chokes quietly on the member that she’s currently doing her best to bury down her throat. She gags and she has to pull back time and time again to get fresh air, but each time she dives down her Lord’s member, she gets an inch closer to her goal. After several minutes of slowly but surely deep-throating Shigure’s cock, the heroic spirit finally reaches that goal.
 
The beautiful samurai’s nose presses into Shigure’s pubes and her drool-covered chin rests against his balls. There are involuntary tears building in the scantily clad Servant’s eyes and despite trying to hold her position, eventually she begins to choke on the massive schlong buried in her throat, forcing her to rear back as the tears finally fall down her face.
 
That does not stop Ushiwakamaru though. With Shigure’s cockhead still between her lips, the determined samurai breathes in deeply through her nose and dives back down once more. Her throat spasms around his length and she chokes almost immediately, but she makes it back down to the base of his shaft all the same, pressing her nose into his crotch yet again.
 
She has to pull back faster though, and that slowly increases the pace at which she fucks her own throat on Shigure’s member bobbing back and forth faster and faster, her tongue sliding along the underside of his length, her lips suctioning down around his girth and her cheeks sucking inwards in an incredibly lewd display for a woman meant to be an ‘honorable samurai’.
 
“Gagkh! Gagkh! Gagkh!”
 
Drool is outright flying from Ushiwakamaru’s stuffed mouth at this point. Strands of the stuff are being flung off of her rapidly shifting chin and ending up across her half-naked body. Tears stream from her eyes and the lack of air causes her eyelashes to flutter and her pupils to slowly roll back in her head. Finally though, just as she’s starting to slow down from her own growing weakness, Shigure cums. It’s in this moment that he takes hold of her head, grabbing at the strange arrangement her long black hair is done up in.
 
Forcing her to the base of his cock one last time, Shigure cums down Ushiwakamaru’s throat, a large, thick load of cum shooting right down into her gullet. To her credit, the heroic spirit manages to swallow every last drop of his seed, a muffled groan leaving her lips even as Shigure finishes up and pulls his cock free of her mouth. Ushiwakamaru is left a panting, flustered mess, tear tracks down her face, eyes glazed over and tired, chin covered in her own saliva and her nearly naked body not much better.
 
Slowly, she looks up at her new Master.
 
“My Lord, urp… you’ve… you’ve filled me up considerably. A-Are you satisfied now?”
 
Shigure stares for a long moment, his cock still standing up straight as he finds that no, he isn’t satisfied. Not yet anyways. He wants more of her… he wants ALL of her. Grinning viciously, the young Master lifts a foot and plants it on his Servant’s chest, using it to push her onto her back. He falls over her a moment later and grabs at the small blue garment she is wearing to cover her crotch. He does not think they are panties, for they’re of a much stronger material… but then, as he tears them off of her and finds nothing underneath, Shigure can’t help but feel that they might as well have been panties.
 
Ushiwakamaru’s breath hitches and it draws the young Master’s attention to the fact that his new Servant’s hand is creeping towards her sword. Hastily, Shigure invokes another Command Seal.
 
“By the power of this Command Seal, I increase your sensitivity and libido by tenfold!”
 
The flash and disappearance of the seal signify it activating and then Shigure brings his hand down on Ushiwakamaru’s exposed cunt, grinding his palm into her clit and his fingers along her mound. The proud samurai’s eyes go wide and her jaw drops open as her tongue sticks out straight for a brief second. Her entire body freezes up and then arches as she climaxes from Shigure’s touch. Her hand, the one that had been approaching her sword, falls away and as he fingers her roughly, the beautiful heroic spirit can do nothing but take it, her body almost constantly spasming under his touch.
 
Eventually, Shigure pulls his fingers back from his new Servant’s cunt. He takes hold of his cock and brings it to bear once more, grabbing onto Ushiwakamaru’s inner thigh for leverage as he leans in. She’s just beginning to calm down when the tip of his thick, prodigious member presses against her pussy lips. The heroic spirit’s eyes bulge out of her skull and her head flies back as her tongue flails about.
 
“A-Ah! My Looooooord!”
 
Her orgasm as Shigure pushes his member inside of her is certainly a sight to behold. He is briefly surprised to find her hymen intact, but after a moment he just accepts it. In a way, she was just born after all, so it makes sense that her body with be in pristine condition. Pressing against his Servant’s virginity for a second, Shigure grins as he watches Ushiwakamaru’s eyes roll back in her head from the sensation, her sensitivity increased even here in this moment.
 
Then, he pulls back and thrusts forward, and the female samurai explodes in yet another orgasm, this time from having her purity stolen from her. As Shigure begins to fuck the tight cunt of his new Servant, he grins viciously down at her.
 
“God, you sure are a slutty samurai Ushiwakamaru. Honestly, Are you sure you’re any good for combat? Maybe this is where you belong, on your back, taking a dick up this tight little pussy of yours.”
 
The heroic spirit’s pride is already in shambles, though she does manage to blush in embarrassment and humiliation at Shigure’s degrading words. But it’s hard for her to defend herself, or even respond at all when his cock is slamming into her cunt again and again and again. Her pussy lips are stretched wide around his thick length and his member’s pistoning is managing to hit every last bit of her extremely sensitive insides. When he finally reaches her cervix, Ushiwakamaru loses it yet again, the feeling of him battering at the entrance of her womb bringing her even more pleasure.
 
She climaxes, but still manages to maintain the barest bits of her sanity, shaking her head back and forth in response to his insults. That stops however, when Shigure rears back and thrusts in once more, finally burying every last bit of his member inside of the female samurai’s tight cunt, and as a result, breaking right through her cervix and into her womb.
 
It’s in that moment that the heroic spirit’s mind shatters. She mewls pathetically as Shigure’s cock fills her womb and stretches it like a condom over his dick tip. He grunts as he pounds into her most sacred of places, and she in turn begins to sing his praises without any prompting.
 
“Yes! Yes, my Lord! You’re so deep inside of me! Fuck me, fuck my womb! T-Treat me like your concubine!”
 
Shigure hesitates for a moment, before grinning wickedly.
 
“Concubine… yeah, I like that. You aren’t a samurai anymore you filthy little whore, you’re my concubine, my sex slave. Got it?”
 
To punctuate the statement, Shigure reaches up and flips back the incredibly meager chest coverings that were hiding Ushiwakamaru’s small tits from the world, His grin turns vicious as he reaches out and mauls her breasts, kneading and groping them as hard as he can. Due to the increase in her sensitivity, Ushiwakamaru positively loses it, climaxing around his cock for the umpteenth time due to the brutal abuse of her tits.
 
“Y-Yes my Lord! I will be a good little concubine for you, I promise! Please, treat me as nothing more than a piece of meat!”
 
Shigure does exactly that, plowing the heroic spirit into the ground and making her his bitch. He slams his cock home into her over and over and over again, filling her womb with his man meat each and every time. Ushiwakamaru’s eyes roll back in her head and her tongue hangs out of her skull in quite a lewd fashion as she does her level best to hump her cunt up towards his pistoning prick.
 
She feels amazing around his member, her pussy walls constantly clenching down along his length in a rhythmic, nonstop manner. Shigure groans, feeling himself getting closer and closer. He can sense his release rapidly approaching, even as his member begins to pulsate and throb, his balls churning with the need to release their payload inside of the womb he’s currently buried deep inside.
 
“G-Gods yes, I’m about to cum! I’m going to fill your slutty little womb with my seed!”
 
As if those are the magic words, Ushiwakamaru actually comes back to herself for a moment. The last vestiges of the once proud samurai shine through, proving that everything she’d said up until that point was the pleasure speaking, not entirely her.
 
“W-Wait! M-My Lord, you must cum outside… i-if I get pregnant, I truly won’t be able t-to serve you in a combat capacity!”
 
Despite her vocal desire to be treated as nothing but a ‘piece of meat’, it’s obvious in that moment that Ushiwakamaru is not fully broken. She does not truly mean what she’s saying. Shigure slows down and pauses for a second as he cocks his head to the side. The female samurai has just enough time to sigh in relief, believing that he’s going to pull out, when suddenly Shigure begins to thrust even harder inside of her, slamming home into her cunt again and again and again.
 
“Thanks for the idea slave! I think I’m going to do just that! And just to be sure, by the power of this Command Seal, I order you to accept my seed!”
 
Shigure could care less about using up his last Command Seal. He knows that the bitch beneath him can’t do anything but squirm and moan and mewl pathetically with her body’s sensitivity so fucked up now. Besides, with the FATE system, he’ll have all three of them regenerated within just three days. Grinning viciously, he redoubles his pace, pounding Ushiwakamaru’s womb twice as hard with his hammer-like cockhead.
 
Meanwhile, the female samurai feels a sharp tingle in her nethers and realizes in that moment that the Command Seal has gone beyond simply forcing her to accept the situation, even as her mind twists and warps to love the idea of his cock filling her with his seed. More than that, the Command Seal has rewritten reality in order to make her eggs hyper-fertile. There’s an absolute zero percent chance that she’ll escape getting pregnant if he cums inside of her in this moment.
 
And of course, that’s exactly what Shigure does. He howls his triumph right then and there, and his cockhead busts through Ushiwakamaru’s cervix once more as he begins to pump her womb full of her virile seed. His white, hot cum paints the inside of her womb and then some, his load hosing into her with great force as his man meat stuffed up her cunt means not a single drop spills out.
 
By the time Shigure is done cumming inside of her, Ushiwakamaru’s belly is slightly distended from the sheer amount of seed filling her womb. With the only way out blocked, the seed has nowhere to go but into her eggs, penetrating them in the same way he’d penetrated her cervix. The heroic spirit is fully aware of her body in every way. That sensation, of her eggs being inseminated, of knowing that she is without a doubt going to get pregnant… it sends her right over the edge one last time.
 
Ushiwakamaru actually foams at the mouth a bit as she climaxes explosively yet again. Her eyes roll back in her head and she passes out for a time. When she wakes up again, she’s a new woman. In the time that she was out, Shigure moved them both to a nearby wall. Her Lord sits under her, holding her close to him in his lap, his massive member still buried inside of her cum-filled cunt.
 
He smiles at her as she slowly wakes up, and she can’t help but give him a lazy smile in return. The heroic spirit leans forward and lightly kisses her Master, before pulling back and biting at her lower lip.
 
“I… this is where I belong my Lord. Thank you for showing me the true way. I was wrong to think I was worthy of being your samurai. My place is here, with your cock inside of me and your cum filling my womb. I want to be your perfect little child-bearing concubine from this moment on my Lord. I-I hope that you will accept me in that role.”
 
Shigure studies her face for a long moment to see how earnest she is. Eventually, he grins and leans forward to give her a much, much deeper kiss than the chaste one she’d given him. At the same time, his hands move down to her perky little rump and he grabs at her ass cheeks, easily holding one in each of his palms.
 
As he begins to slide his Servant up and down on his cock yet again, this time simply for the pleasure of it, his tongue slips into her mouth and he dominates her there as well. Ushiwakamaru moans lewdly into his mouth and her hands come to rest on his shoulders as she helps him impale her cunt on his massive meat rod again and again.
 
Eventually, even as he begins to pick up the pace, Shigure pulls away from her eager lips and gives her an answer, accompanied by a wicked grin.
 
“I accept, my delicious, tight little concubine. We’re going to have so much fun together you and I.”
 
Ushiwakamaru blushes deeply and returns his wicked grin with a shy, eager smile. Even as he continues to fuck her however, Shigure’s thoughts are already on other matters. He wants more than just this one. He wants more Servants, some to fight his battle for him, sure… but most of all, he wants to summon female heroic spirits from across history so he can fuck and dominate them like he did with this one.
 
Of course, with the Chaldea Security Organization reduced down to three members, he had all the power and all the control now. It was just him, Mash and Dr. Roman… and neither Mash nor Roman were going to be summoning Servants with which to save the world any time soon! There was no one left to stop him from repurposing the CSO into his own creation.
 
In fact, Shigure rather thought it was time for a slight name change. Chaldea Subjugation Organization had a nice ring to it, didn’t it?
 
Ah, but he was getting ahead of himself. First, he’d gather more servants and impregnate them just like he had with Ushiwakamaru. Then he’d look into expanding his influence further…

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