Chaldea Subjugation Organization (Fate/Grand Order)

Mysterious Heroine X, as she went by in this world, was a very serious sort of individual. After all, as a Saber of the HIGHEST caliber, she had to always be focused, always be on guard. Especially when there were so many other Sabers, all clogging up the pipes and what have you. It was her job as an Anti-Saber Decisive Weapon that performed fair and square surprise attacks as a knight (also of the highest caliber!)
 
With her mysterious magic sword, Secret-Calibur, she delivered blow after blow to her Master’s enemies. And boy did the Master of Chaldea have a lot of enemies for her to take on! In fact, X had been able to train herself up on her Master’s foes, ultimately becoming quite the strong Saber indeed. It brought her ever closer to her goal of becoming the best Saber of them all!
 
The thing was, the Master of Chaldea really had been good to her. X couldn’t deny that, the way he paid her such attention, the way he showered her in affection and raised her as a Saber (because of course she was a Saber! Definitely not an Assassin! Anyone who said as much would taste the blade of her Secret-Calibur!) until she was just… well, the best of the best.
 
She really was amazing, wasn’t she? A smile spreads across Mysterious Heroine X’s face at that. She was the best, and it was all thanks to Master. And that was why she was here now, standing outside of his door, mustering up the courage to knock. N-Not that she didn’t already have the courage or anything of course! She was a heroine after all, courage was the name of the game! She just… she just needed to figure out exactly what she was going to say.
 
X knew she wanted to thank her darling Master for all he’d done for her. But a simple verbal ‘thank you’ just wasn’t enough! She had to… she had to pay him back somehow for taking such good care of her. What would a man like him want though? Tapping her finger against her chin, the Mysterious Heroine strikes her thinking pose, a very serious pose as she contemplates just what she has to offer the Master of Chaldea. After all, he’s so big and strong and handsome… he probably doesn’t want for much. What does she have that he needs?
 
Aha! That’s it! Smiling brightly, an idea pops into X’s head. She’ll tell him her real identity! No one knew that, given she came from another land and another world. She had been very careful to disguise herself, so he should be just as in the dark about her true name as everyone else! So, she would tell him. Her Master had earned that much at least, right?
 
… Definitely! Now she just needed to knock. She just needed to reach up and knock…
 
Before she can second guess herself any longer, Mysterious Heroine X raises a small fist and raps it against her Master’s door. A moment later said door slides open and the Master of Chaldea peers down at her from the other side.
 
“… Yes, X?”
 
Beaming at being addressed by the nickname he’d come up with for her (Master was so smart!) X pushes her way inside.
 
“I wanted to talk to you Master! It’s very important!”
 
“… Very well.”
 
And with that, he closes the door behind her and turns to face her as she realizes she’s suddenly in the middle of her Master’s quarters, his bedroom… Ah, this is…
 
-x-X-x-
 
Shigure regards the Servant known as ‘Mysterious Heroine X’ with some amusement. She really is a cutie, which is probably half of why he puts up with her. Her petite frame, her succulent ass accentuated by her cute booty shorts, and most of all her best feature, her taut, smooth belly. It all added up into quite the spectacular visage, even if her rough and sporty ensemble ostracized her a little from the other Servants, due to its strange appearance when compared to everyone else.
 
Still, as she’d explained to him, her blue muffler was a symbol of courage. And her cap… well, it was apparently what she used to conceal her identity from the world. Shigure hadn’t asked if that was because it was supposed to hold back the ahoge that sprouted out of the front of the cap at all times. He also hadn’t actually pointed out the ahoge sprouting out of the front of the cap at all times…
 
It was just too amusing for him to ruin it. The whole situation with X was amusing to him, and even now with her glancing around furtively, like she thought he wouldn’t notice her realizing she was now in his bedroom alone with him, Shigure was still amused.
 
“I… uh… uhm. Well, that is to say… I want to thank you, Master!”
 
Shigure lifts a brow at that, but now that she’s started, X plows through as she always does, a bright smile on her face.
 
“Yeah! That’s it! I’m here to thank you for everything you’ve done for me! But I need to pay you back, the only way someone as cool and awesome as me can!”
 
His other brow joins the first. Wait, was she going to… nah, that couldn’t be it. He was just living too much of a life of debauchery these days. His mind was perpetually in the gutter. X was NOT about to proposition him. But then, what other way was the ‘Mysterious’ heroine going to do so?
 
“I’m going to… reveal my secret identity to you Master!”
 
Wait, what?! Shigure has to bring a hand up to his mouth as his eyes widen in shock. X sees this of course, but she takes it to mean he’s just utterly surprised at this turn of events. She even nods to herself, not realizing he sees it, as if unsurprised by his surprise, as if expecting his reaction. In reality, Shigure isn’t shocked or surprised by X’s declaration. At least, not in the way she thinks he is.
 
No… it’s more that he’s having to harness every ounce of his willpower into not bursting out laughing right into the ridiculous Servant’s face. Mysterious Heroine X has always been an oddball, but even if she refused to be labeled as an Assassin, she made a fairly strong combat Servant. So Shigure had used her frequently in battle, he’d leveled her up, he’d made her stronger. And all he’d had to do to make her happy was never call her Assassin. He figured she just got off on being called Saber or something.
 
But this? The Master of Chaldea could scarcely believe his ears. Did X REALLY think that he didn’t know who she was already?! Did she REALLY think she’d managed to hide her identity, when there were practically half a dozen other Servants running around with her exact same face? Given how she was smirking and crossing her arms over her chest even now… yes. Yes, she did.
 
“That’s right, Master. I know this is a bit of a shock, but I’ve decided its time. You’ve proven yourself trustworthy, and I’m going to show you exactly who I am! You can’t tell anyone else though, okay?”
 
Not even giving Shigure a chance to respond, X reaches up and prepares to grab her cap and muffler. Was that truly going to be her big, dramatic reveal? Was she going to pull those garments away, as if either of them concealed any part of her identity to begin with?!
 
“Here it goes! The truth is, Master… I’m-!”
 
Shigure can’t help himself.
 
“You’re Artoria Pendragon.”
 
If this were a sitcom, Shigure figures right now would be the perfect moment for a record scratch. X, also known as yet another incarnation of Artoria Pendragon, the King of Knights, freezes up with her hands clutching at her blue muffler and her cap. Her lips open and close uselessly and soundlessly for a moment, before a low keening sound comes out of her throat. Finally, she finds words again.
 
“Y-You… Master… you already knew?!”
 
Shigure cocks his head to the side, inwardly grinning like a loon, while outwardly putting on a confused façade.
 
“Was I not supposed to? Isn’t it obvious? Your ahoge is sticking out of the front of your cap.”
 
X’s hand immediately comes off of the side of the cap to grab for said ahoge. When she latches onto it, it stiffens in shock as she does the same. The cute, petite blonde tenses up… and then breaks down, falling to her hands and knees in a picture-perfect depression pose, straight out of some anime. Shigure could practically see the storm cloud over her as she hung her head.
 
“Master kneeeeew! My ahoge was sticking out all along!!! How could I let this happen?!”
 
Shigure can’t quite help himself. He chuckles, causing X to tense up all over again as he laughs at her expense.
 
“Were you really trying to keep it a secret, X? You didn’t even actually hide your face. Your muffler only ever hid your neck from me!”
 
Another incoherent whine leaves X’s throat, and she pounds on the floor of his room with her tiny, yet powerful fists. Shigure smirks, even as he begins to grow hard. What can he say? Teasing cute Servants is a massive turn-on for him.
 
“X… get up. As your Master, I command it.”
 
Sulking visibly, the blonde Servant slowly does so, her eyes still downcast until Shigure places his fingers under her chin and forces her to look up at him. When she does so, she finds his own face very close to hers, as he leans down to meet her level. Their lips are only a few inches apart as Shigure speaks.
 
“You really were terrible at hiding who you truly were, X… but in the end, I didn’t mind. Because I like you for you, for who you want to be, not for something as meaningless as your ‘true identity’.”
 
And then he kisses her, punctuating his teasing with a deep, tongue-filled lip-lock. X’s eyes go wide and she blushes atomically as their tongues intertwine and his lips press against hers quite insistently. She squirms for a moment, but a moment is all Shigure needs to make his intentions clear, before ultimately, he pulls back and leaves his darling ‘Mysterious Heroine’ to recover.
 
Recovery doesn’t seem to be something X is capable of though, as she stutters and stammers, babbling senselessly from sheer embarrassment over the sudden kiss. Her ahoge is even straighter now, completely and utterly stiff in shock and surprise over what Shigure’s done. And as he regards her, the young Master of Chaldea realizes that X truly has no idea what to do next.
 
She’s more innocent than some of his female Servants, and just as innocent and naïve as some of the others. Chuckling as he re-assesses his plan of ‘attack’, so to speak, Shigure steps in closer, invading X’s personal space as he embraces her and runs his hands over her back. She goes stiff in his arms, looking up at him from where he has her trapped against his chest with uncertainty in her watery eyes. She’s not going to cry, but she was certainly close before he kissed her.
 
“You know, X… I can’t believe that all this time, my loyal Saber has been lying to me. I thought you were my best. I thought I could count on you…”
 
X’s eyes go wide and the tears almost fall again, before Shigure continues on with his smile still wide and on the edge of wicked.
 
“I think the ONLY possible way you could ever apologize is by giving me this cute body of yours to play with to my heart’s content. I think you should let me do whatever I like with you. Only then will you really be able to make up for lying to me all this time. Don’t you agree?”
 
“Y-Yes!”
 
She blurts out the answer before even fully processing what he’s said. That’s alright. It’s just perfect. Of course, this means X goes shy the moment after she agrees, ducking her gaze until he pulls her head back up again and gives her another kiss. She melts into him at that point, moaning against his mouth. What follows is a frenzy of clothes pulling, as Shigure works X over to his bed.
 
In short order, Shigure has his darling, ridiculous Servant on her back with her booty shorts hanging off on of her ankles, and her underwear pushed to the side. Interestingly enough, her underwear seems to be part of an open-front leotard instead, now that he’s seeing her taut tummy in all its glory and paying attention to the rest of what she’s wearing.
 
Of course, his eye is still on the prize, even as he gleefully presses one of his palms down on said tummy, rubbing X’s smooth belly to his heart’s content. Why yes, he had longed to do exactly that for quite a time now. No, he didn’t think that made him all that much weirder than any of the other activities he liked to take part in with his Servants.
 
Grinning like a loon, Shigure uses his other hand to guide his cock to X’s small, bald entrance. Her pussy lips are already wet as he begins to push in, and the blushing, unsure Servant moans and mewls when he starts to penetrate her. But Shigure is impatient. She’s tight, and his slow method is only taking longer because of this. Rather than spending the next five minutes taking his cute blonde Servant’s virginity, the Master of Chaldea decides to go with Plan B instead.
 
Rearing back, Shigure doesn’t even give X time to whine in disappointment at the lost of his phallus, before it’s inside of her once more, this time FAR deeper. His cock fills her to the brim in one single thrust, and Shigure can actually FEEL it through her taut tummy, his member stretching X out in a way he can’t do for some of his other female Servants.
 
At the same time, his eyes are drawn to an interesting change that comes over X’s face… and her hair. When he penetrates her and fills her with his cock, slamming right up into the entrance of her womb, the pupils of X’s eyes become heart-shaped, and even her ahoge twists itself into the shape of a heart, before staying that way, apparently permanently.
 
Shigure can’t help but laugh at that, even as he uses his free hand to grab hold of X’s side, so he can fuck her properly, all while continuing to rest his palm on her cute, taut tummy.
 
“You really are the silliest of my Servants, Mysterious Heroine X!”
 
He only gets a moan in response, as the petite blonde wraps her legs around his waist as best she can, not getting ALL the way there, especially with his thrusting, but still giving it her best shot.
 
“Mm, but that’s okay. Do you know why, my cute little Servant?”
 
Leaning in close, Shigure lets X wrap her arms around his neck as well, even as she tries to draw him into a searing kiss with her considerable strength. However, in the end X isn’t ACTUALLY a Saber. She’s an Assassin. Her strength stat isn’t as high as it is for some of the other Artoria-types. And as far as Shigure is concerned, his own strength is on par with some of those Artoria.
 
Given this, she can’t quite drag him the rest of the way down to her lips. Not until Shigure lets her, and he doesn’t do so until after he’s said his piece. Leaning in close, his voice a murmur as he continues to fuck and pet her petite form, Shigure grins.
 
“It’s because I like things a little silly. And I especially like them when they’re cute and oh-so-fuckable.”
 
And then he’s kissing her, and X’s eyes are rolling back into her head as she ahegaos on the spot. Their tongues intertwine for a moment, but hers is just too wild, writhing about inside of his mouth. Kissing her feels like riding a bull, and eventually Shigure pulls back in order to fuck her properly, his hand still on her tummy as she moans and squirms and wiggles beneath him.
 
“L-Love… love you, Master! D-Do it! F-Fuck me! Fuck my cute body! Love you, love you, love yoooou!”
 
Shigure is honestly impressed that X can even get those words out, and even then, half of them are slurred as she cums again and again around his cock, looking like quite the silly, wanton little slut. But that’s just fine with him. He quite likes the look on her face, like she’s been fucked senseless when he’s not even done with her yet. It goes quite well with the feel of her tight passageway clinging to his member, squeezing down around his meat rod as it pistons in and out of X over and over again.
 
He was telling the truth when he told her that she really wasn’t just another Artoria, not to him. She’d made something unique of herself, and while she might share the general Artoria features like her face and her ahoge, she was really all her own person, when it came down to it. And that made the experience all the more special as her insides finally milked his load from him.
 
Cumming, Shigure groans and arches his back into the petite blonde, even as X experiences one final orgasm as well, her heart-shaped pupils rolling about in her head until he’s finally done filling her with his seed. As he pulls out of her and flops to her side on the bed, they both slowly but surely come down from their respective orgasmic highs.
 
But even once she’s calmed down, X’s newest features remain. As she turns onto her side to look Shigure in the eye, the Master of Chaldea sees her heart-shaped pupils and heart-shaped ahoge still fully in effect, completely permanent, or so it seemed. And as he took that in, X spoke, her voice softer than usual, her cute little lips moving to form words that he never expected to hear from her.
 
“F-From now on… I’m the Assassin-Class Saber, Mysterious Waifu X… and I will always be here for you Master, as the sheathe dedicated to your glorious sword.”
 
It was the Assassin part he never expected to hear, to be clear. The rest seemed pretty par for the course given his track record with his Servants. Chuckling, Shigure pulls X in close, cuddling his newest ‘waifu’ as he kisses her forehead and lays back. A nap sounded good right now… and as his hand finds its way to X’s taut little tummy for one last rub, he’s quite ready to go to sleep, completely and utterly satisfied.

-x-X-x-

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