[Breeding, Mind Break, Brainwashing, Sluttification]

Artoria had done it. She had finally managed to make her wish come true. She had attained the Holy Grail through the trials and tribulations of the Holy Grail War, and she made her wish to undo everything that led her to becoming a King become reality.

So why did it feel like something was dangerously and horribly wrong, as she closed her eyes for what would be the final time..?

"My my, it's been so long since our history together began, but here you are. Finally a part of me."

Artoria's eyes shot open as she heard a foreboding voice, but all that she saw was a young red-and-black-haired boy standing right in front of him. A boy that radiated energy that was strong enough to make her entire body tremble. Who was he? What was he? She didn't understand, but one thing was certain. It was like her wish hadn't come true at all.

"Who... No, what are you?" Artoria asked as she tried to call upon her weapon. Only, there was nothing to call upon. There was absolutely nothing she could call upon. All she could do was look directly at the boy, who kept on smiling as she realized what little she could do.

"Oh, you should know me well enough by now, King of Knights." The boy said, his eyes gleaming with that unholy color that had plagued her attempts to claim the Holy Grail. "I am the Holy Grail. And you've become a part of me." He said. But his identity should be impossible...

Artoria merely glared at the boy. "If you truly are the Holy Grail, then why was my wish not granted? Why am I here?" She paused, as a soft draft started to graze by her body. "And what did you do to me..!?" She shouted, finally realizing that she had been stripped completely naked. All while her body had been adorned with a grail imprinted right above her pussy, a grail that seemed awfully empty...

"It has come true." The Holy Grail said, all while keeping that foreboding and eerie smile on his youthful face. "Unfortunately, you and your fellow Servants serve as eternal fuel for these wishes. Just like you all are summoned from the Throne of Heroes, you're now plucked from the world. All to ensure that your younger self will live a happy life. Does that not satisfy you?" He said, giggling as he revealed his deception. "But don't worry. You won't need to think about your younger self for much longer. You have a long life ahead of you, as part of my existence."

While her wish was seemingly granted, this was not the way she wanted to hear about it. She wanted to relive life, as her younger self. Without worrying about the fact she'd have to carry the weight of a country's fate on her shoulders. "I want no part in this. If you will not-"

Just as she was about to complain about all of this, her body started to jolt and shake, a powerful shock of pleasure rushing through her as an ecstatic scream left her lips. What was this... What was this sensation? What was happening to her!? Could she stop it? Was there any way to stop it? She didn't know, but she wanted it to stop. Now!

The Holy Grail giggled in response to her reaction. "My my. You really don't understand what's happened to you. I told you already, you're part of me now, Artoria Pendragon. And as long as I exist, you will serve as fuel for my wish granting functions. Just like all the others that have had their wish granted."

Her eyes widened as the world around her slowly started to grow brighter. She had barely even given her surroundings a proper look due to how sudden her awakening was, but the fleshy nature of everything around her only served to confirm what the boy had said.

It wasn't the reason why she was shocked however. The reason she was shocked was due to the many women that were currently stuck inside the walls. Women that she had once fought against, as well as women that she didn't recognize. And yet she was able to identify them, thanks to a flood of knowledge that poured into her.

She recognized Medea. She recognized Medusa. She even recognized another version of herself, all of them with dim eyes and massive pregnant guts that were beyond veiny. They were on the verge of giving birth to something wicked, and yet they didn't need to care. Nor did they seem to truly feel alive...

The many other women belonged to different time periods and myths. The living Saint, Jeanne D'Arc. The Roman Emperor, Nero. The Oni-Slayer, Minamoto no Raikou. The Goddess, Artemis... And so, so many more. All of them in the exact same condition as the women that she had already fought against. Burdened with young and seemingly drained of all life, yet still trembling as their children continued to gestate within them.

"What... What in the world..!?" Artoria cried out. Even if she had no real way to fight back against the Holy Grail, she turned towards the boy that represented it and quickly squeezed her fists together. "What did you do to them!? What did you do to all of them, what's within them!?" She had questions. And though she knew she wouldn't get the answers she wanted to hear, she was beyond furious and thus couldn't see reason.

The Holy Grail laughed as he watched her try to attack him. The fist barely grazed his cheek as she threw a punch. "They're being used as fuel. Just like you will be. Your womb, your very existence, it will be used for proliferation. And the life force of what you give birth to... It will sustain me. All of you will continue to birth more and more energy for me to consume."

As he spoke, a cacophony of moans started to echo out. And as Artoria threw glances at every single female currently stuck within the Holy Grail's walls, she saw more boys like him emerge around them. Each giggling in such an eerie yet friendly manner as they thrust enormous shafts into them. Shafts that brought every single one of them to climax at the same time, showing just what would happen to Artoria...

"Ahhh... The sound of life being proliferated once again." The Holy Grail's avatar spoke, all while smiling as he looked at the blonde in front of him. "You really should try it. I'm sure you'll find that you're a natural. Much like any other female is, once they've been given a little taste of their basic need."

Artoria glared at him once again, as she tried to launch another punch. But this one didn't just miss its mark, the boy outright grabbed her hand and started to squeeze it so tightly that it was like her bones were fracturing right then and there...

"Your strength has left you, King of Knights." The Holy Grail said, all while letting go of her fist and shoving her right down onto the ground. Giggling as the floor started to cover the blonde King, preventing her from moving as it squeezed around her.

What was it doing to her? Was she going to end up just like them? She didn't know. All that she knew was that she hated the sensation bubbling inside her. She hated it beyond all belief. She wanted it to stop, so that she wouldn't be like them. She didn't want to be pregnant. Much less with the spawn of something as unholy and vile as the Holy Grail...

A sharp moan left her lips as she felt the air brush against her body once more, forcing her to look down upon her body. It was... It was enhanced. Built for breeding, with her breasts now much bigger than her head and with her hips jutting out so far that she would have a lot of difficulty sitting upon a throne...

"What... What did you do..?" Artoria muttered, all while her heart beat harder and harder as she now looked upon the boyish avatar. Why did she feel such an intense sensation within her chest? It was... Love? She didn't understand. She didn't want to understand. She just wanted to know why her body was now that of a broodmother's, without the stomach to match it. Then again, considering what had happened to all the women stuck inside the walls...

The Holy Grail giggled as he slowly ran a single finger along his otherwise featureless crotch. "I have prepared you for your duty, Artoria. Now, to ensure that you will be enjoying that duty for the rest of time." He replied and explained, as that gesture slowly caused something to grow from his crotch.

Artoria watched in mild horror as an enormous shaft, reaching all the way up to the boy's chest, grew from that flat surface. It was astonishing how big it was. How was she supposed to handle something like that? Could she handle something like that? Whatever was the case, she could feel her heart trembling the more she looked at it. She shouldn't feel this way, and yet....

"There it is. The look of a female who understands her place." The Holy Grail said, keeping that eerie smile on his face as he grabbed ahold of her hips. "Now, to make it official. To make sure that you will remain a battery for me, for the rest of your existence."

A sharp cry left her lips as she felt his cock slide straight into her folds. This was one of the very first times that she had sex, and yet even a veteran would've had trouble with something this large. She couldn't believe how wonderful it felt to have him shoving around inside her. She couldn't believe it for even a second. It was so unfathomably intense...

In fact, it was so intense that she couldn't even come close to handling it. She immediately started to climax, crying out as her juices poured out. All while the symbol right above her pussy started to glow, the grail filling out ever slightly.

Of course she wasn't the only one that climaxed. The Holy Grail's Avatar shoved his cock as deep into her as it could possibly reach, smashing straight through her womb's defenses and leaving her crying out even more as his seed quickly filled that birthing chamber. The first of many virile droplets that would make her utterly stuffed. The first of infinite climaxes that she'd be forced to endure, as long as she was still inside of this unholy entity that deemed it appropriate to prey on her...

The Holy Grail giggled at the sight of how quickly she had collapsed. She looked like she was truly satisfied with being nothing more than a seedbed for him. Something that brought a wicked smile to his face. "Thus, the King of Knights falls. And with that, another life-"

"I..." This time, it was the Holy Grail's turn to be surprised, as Artoria panted. Slowly pulling herself up, after the boy had pulled his shaft out of her. "I will not give in... I will not be yours..." She panted, all while still drooling from both her lower hole and her lips. Even though she looked like she had been fucked into submission, she still put up a brave front.

The Holy Grail's grin widened further in response. "You think you can last, Artoria?" He asked, as he put his hands on her hips once more. "You think you can avoid becoming another source of energy for me? You think you will be able to save yourself, much less all the others that have become a part of me?"

"I think..." She panted, before shining the brightest smile that she possibly could. "I think that you need to try harder...!" She cried out. Even after she had been stuffed with so much seed that it looked like she was almost a little too pregnant, she was still able to put up such a front.

The Holy Grail laughed, as he began his efforts to break her once more. All because of those brave words...

---

Artoria thought that she could last. But the truth of the matter was that she couldn't. And she knew she couldn't. So why did she even try? What would drive somebody like her to put up a front of being defiant, knowing that she wouldn't be able?

...Because she wanted more. Just as the Holy Grail had implied, she was just another female in the end. As soon as she had gotten a taste of his cock, as soon as he had given her insight into the kind of behavior that would break any female, she knew she wanted more. She wanted it so much that she would do anything. Even acting like she had been able to resist.

And he did give her more. He gave her so much that she truly broke. The sensation of having that massive thing shoved inside her was enough to shatter her resistance and her needs, leaving her a screaming and delighted mess. And that was only within the first few hours of being inside the Holy Grail...

If anything, the fact that she broke that quickly was a blessing in disguise. The kind of pleasure that poured through her as she was being fucked was overwhelming in and of itself. Any human would be broken from even a second of it. So a broken mind like hers was able to enjoy it to its fullest, becoming little more than a slut that was driven by nothing but that intense pleasure.

It just kept pouring through as well. Every time he fucked her, it became more and more overwhelming, leading her to cum again and again. And with every orgasm, the emblem right above her pussy, that grail that represented her true role, filled up more and more. By the time it finally filled, she had lost all perception of time.

Of course it wasn't just it that had filled up. She had been filled beyond belief as well. Her womb practically swimming in so much cum that it was going to drown out anything that was actually able to form in there. Not that it mattered. Anything that she would get close to birthing would be turned into essence that fueled the Holy Grail as well.

At that point, it only made sense for her to look like she had been pregnant for months. All of that virile juice forcing her to conceive over and over, only for the essence to get absorbed by the Holy Grail, leaving her wanting more. It was the fate of a slut like her. To be bred until she was about to pop, and then drained until there was nothing left. Rinse repeat, until it was time for her to be put into the wall just like all of her fellow sluts...

And yet, the Holy Grail continued to fuck her more and more. Fucking every hole, ensuring that she would end up as pregnant as possible, despite the fact that she wouldn't be birthing anything. Was it because it wanted to satisfy her, or was it because she had managed to taunt him to the point where he wanted to ensure that she was being used to her fullest? Whichever was the case, she continued to get fucked again and again despite how she had already been broken.

Artoria truly was blessed to be broken so early, because her mind wouldn't be able to endure her new existence...

---

"Congratulations, Artoria."

The blonde slut slowly looked up at the boy that had given her much of that delightful pleasure, giggling a little as the drool ran down her cheek. He was praising her. She liked it when he praised her. It made her tummy squirm and the seal on her womb glow nice and bright...

"You've been such a good source of life that I wanted to show you something. The fruits of your labor. The effect of your wish. Would you like to?" The Holy Grail asked, and he didn't get a response. Why would he get a response from somebody that was utterly unaware of the world around her aside from the cock that was being shoved into her cunt?

He didn't need to hear her answer anyway. A simple snap of his fingers, and images started to flood into her mind. Images of... A girl much like her. Only, she was happy. She was delighted. She was beyond ecstatic...

Because she had become the King's favorite maiden. He kept on calling her into his room and breeding her every day and every night. That was her life. To be a throwaway consort of a man that was supposed to rule over her. That was what fate had in store for an Artoria that never became King. A fate that her older self had signed her younger self away to.

Not that Artoria understood what happened. In fact, the images just made her horny. She wanted to be fucked, just like the girl that was appearing in her mind. So much so that she squirmed inside that wall, prompting the Holy Grail to laugh at her needy display.

"Very well. I'll give you what you want." He said, as more avatars like him started to emerge from the wall. More that would give her exactly what she wanted. Just like all the other women that had become a part of the Holy Grail.

Though she had seen new faces arrive since she broke, she didn't recognize them. Nor did she care. All she cared about was the cock being shoved into every hole of hers. All while her dim eyes continued to make her look like life had left her, despite how wonderful all of this felt.

This was her fate. To be an eternally fucked battery for the Holy Grail... And she could not be happier…