Title: A Curvy Grail War

Fandom: Fate/Stay Night

Words: 2754

Summary: After attempting to summon her Servant, Rin finds herself growing in all the right places.

Tags: Breast Expansion, Lactation, Bimbofication, Consent?

xxx

Rin Tohsaka was ecstatic.

While the Holy Grail War might have started way earlier, it just meant that the chance was going to be hers instead of her children's.

She was going to win it, and she would fulfill her family's dream and reach the Root.

And as Rin held up her hand and began to chant the summoning chant to summon her Servant, she did not realize that she had made two crucial mistakes. First, the Tohsaka Family 'Curse,' as it was, began kicking in, which made them mess up at the crucial time, even being haunted by a mistake of her grandfather at this crucial moment.

Though that one would affect everybody in the war.

The first thing she had forgotten was to reset her clocks, meaning that Rin was not at max capacity like she thought she was, and the second was that she had decided to stand in the middle of the Summoning Circle where her Servant was supposed to appear.

And so, as Rin finished her chant, it instead blew up in her face knocking her to the ground with a loud thunk, and soon after, she heard a loud crash from upstairs.

"Urgh, why did that happen, and what was that?" Rin asked as she got back up on her feet and wobbled a little as she felt a strange heat go through her body, a heat that was very familiar to the feeling of arousal. "Waah?" Rin asked, the air in shock as she wrapped her arms around herself as she felt the heat start to pool in her chest.

And then she felt a jolt of actual pleasure shoot through her body, and Rin was pretty sure she actually came as her crotch felt warm and wet. An involuntary moan left her body; it sounded musky.

And her sweater felt tighter…

Rin looked down at her chest, and her eyes went wide at what she saw.

Her chest.

Her breasts.

Her boobs.

Her boobies.

They were larger.

Before, they had been a low B-cup, but now they were definitely a high C-cup as they stretched out her sweater much more. Rin's nipples were also rock hard with arousal as they tented the fabric, Rin having discarded her bra earlier in the night, and now they, along with being very, very hard, were also very sensitive. Rin could feel jolts of pleasure as the fabric moved against the flesh; as she moved her arms up and her hands cupped the expanded flesh.

"How did this?" Rin began to ask as she touched her larger chest, though as she did, Rin let out a high shrill moan as another orgasm jolted through her body.

And then Rin felt it as she held her breasts in her hand.

She felt them grow.

Her breasts.

Her tits.

They were growing by the second until they stopped, and Rin could see and feel they were now D-cups. And the heat wasn't dying down as Rin could feel the heat between her legs and in her core of her womb. Her body was filled with lust, so her hand went down to her soaked panties. It was but with a simple touch against her swollen labia that had swallowed up her panties and leaking down her legs that Rin came again. Her other hand felt her breasts swell once more, increasing until they were just as big as Sakura's boobies.

And as she played with her breasts and labia Rin did not notice that her breasts weren't the only thing swelling. No, her thighs, hips, and ass were also, in fact, increasing in size. Her firm thighs, that many already lusted after, got more meat on them, making them look like tree trunks. Her hips got wider, got from respectable to what many would call hourglass birthing hips, which made her look perfect for breeding. Then there was her ass, that got just as big an upgrade as her breasts, swelling and swelling with fat until they surpassed what Sakura had currently and even most pornstars, lifting her skirt up to give everyone a good look at it so that all knew if they threw a coin at it would bounce right up.

Or perhaps even bigger? Rin wondered as she tried to calm herself down from her orgasmic highs, removing her soaked-in pussy juice fingers from her cunt as to stop herself from masturbating on the spot.

As she was a dignified lady and a Magus with the self-control to match, she wasn't a lusty little slut who thought about big fat cocks filling her rather empty pussy up. No, sir, she was not; she was definitely not thinking of getting railed by Emiya-kun. "No, I definitely don't want Emiya-kun to thrust his cock into my pussy and make him play with my boobies." And Rin definitely didn't know that Emiya-kun possessed the biggest cock in the school, thanks to certain rumors told her by her female friends. Explaining that was why Shinji was so jealous of him because his own peepee was tiny in comparison to Emiya-kun's massive tool. "I definitely don't want him to present his throbbing cock to my face so that can suck on it and make him shoot his cummies down into my stomach. All the while I play with my cunny…"

"I… what was I saying?!" Rin asked herself as her mind came back into focus. "Something definitely went wrong with the ritual; stuff like, like getting bigger titties shouldn't be happening; I need to see what made that sound," Rin said to herself as she began walking out of the basement.

Though as Rin walked, she couldn't help but notice that her behind was making a brand new sound.

Smack, smack, smack.

And as she reached around to check, Rin's face became even hotter as she Rin could feel her fingers sink a little into the brand-new flesh of her behind and quickly removed them as she continued upstairs, ignoring the clap of her asscheeks. Also, the continued lust that ran down her legs. And also the feeling of her breasts getting even heavier, not from expanding in size like they were being filled with…

And then entered her living room which was utterly ruined, smashed furniture everywhere, and there was even a hole in her roof, and on her sofa Rin saw…

Probably the hottest man she had ever seen in her life, his tanned skin was like looking a liquid milk chocolate, his hair a snowy white that was highlighted by the tone of his skin. His eyes were a steel grey, staring at her like a hawk would, and his outfit accented his body even further, the cloth contrasting with the black uniform underneath, his breastplate seemingly molded around those delicious abs of his.

"Hey, are you the one that summoned me?" He asked, and his voice, his voice was like a… Rin didn't know what, but it was definitely something. "And…" His voice trailed off as he actually looked at her, his jaw going a little slack, and Rin could see that he was staring at her (now raised by her expanded ass) skirt. Which at his current position would show her drenched panties. "It seems my Master is also a pervert."

"I am not a pervert!" Rin shouted as she pulled her skirt down as much as possible in front of her wet panties but doing nothing to hide the arousal down her legs. "This stupid summoning just went wrong, you didn't appear in the basement, and then my body started changing, getting all bigger and hot. So it's clearly your fault." Rin complained as her face was red with both shame and lust.

"So, in addition to being a pervert," "I am not!" "My master is also incompetent; what did you stand in the summoning circle?"

Rin's face got even hotter.

And the Servant facepalmed.

"Well, even so, I've still got the Command Spells, which means that I am your Master, and you're my Saber Servant. And because of that, you have to listen to me." Rin said while dying of shame and also burning lust as she wanted this hot piece of male to pin her down and fuck her needy pussy. She could feel it opening and closing, begging to be filled with cock.

"Archer."

"Huh?"

"I am Servant Archer and not Saber, and no, I don't have to; they can only make me do one thing at a time, and I have yet to see you as a worthy Master," Archer said while crossing his arms.

"Well, how about I use one to make you obey all my orders, then? What do you think about that, Archer?" Rin said back.

"That would be too broad an order; it would only be a mild compulsion I can easily ignore," Archer said back. "And besides, they are a precious resources that should not-"

"Archer, by my Command Seal, make my desires yours and fuck me!" Rin shouted with lusty desperation in her voice as, throughout the conversation, her pussy had been getting even wetter and wetter while she stared at her summoned Servant, and now that was getting way too much for her.

"Wait, what?" Archer asked in shock as the seal flashed red and the Command Spell took effect on the Servant. Archer immediately felt lust flush through his body, his cock getting instantly hard in his pants as it begged to be released and fuck the slut before it.

And Archer's mind was shrouded by new thoughts and feelings as his desires were replaced by Rin's. And those desires were for him to fuck her into a puddle.

And he acted upon those instantly, and he saw Rin's face go from smug to shock as he appeared before her, smashed his lips against her, and started forcibly kissing her, forcing his tongue into her mouth. She put up an instinctive resistance to the invasion of the foreign piece of flesh, but her defenses instantly crumbled as her lizard brain recognized the situation for what it was.

Mating.

And so Archer got free access to her mouth as his hands went to Rin's ass and grabbed hold of her larger buttocks. And they startled mold and play with the expanded flesh. Flesh, which was now getting larger. As Rin's ass started growing once again in Archer's hands. His fingers sank into the bubble butt.

"Hmm!" The two moaned as Archer continued to play with Rin's tongue with his own, fingers sinking into Rin's dough-like ass, whereas before it was on par it was now larger than most pornstars, it was truly ridiculous posterior to what she had before, and her thighs were no better off as they grinded against each other. Her stockings were almost swallowed by the expanded meat, pussy juices running down even faster as Rin's arousal increased.

Rin felt like she was in heaven as her Servant's tongue played with her own. She felt his erection pressing against her lower stomach area.

And she wanted it.

She wanted that cock.

And so her hands started to finger with the pants, and as they continued to french each other, he played with her now even larger ass. And she managed to. After a minute of trying to unbuckle the pants, she got them and the underwear down, and Rin felt the now free cock smack against her panties, hitting her hard clitty. She couldn't see it, but she could. It was an impressive piece of manhood.

But before Rin could do anything else, Archer pulled out of her mouth and spun her around before lifting her up by her waist.

"Waa?" Was all Rin could manage to say as she felt her body be moved down and then penetrated by Archer's eight-inch man-cock, instantly taking her virginity. But Rin felt no form of pain, only pleasure as she was fucked by her Servant just like she desired.

She had also been so absorbed by the kissing and the unbuckling of pants that she hadn't even noticed that Archer ripped her panties off.

"Ah, yes." Rin moaned as Archer moved her body up and down his cock like she was some sort of sex toy, and Rin loved the feeling. She loved being used like a cocksleeve by her well-muscled and strong Servant. His presence actually comforting as his big strong arms moved her up and down his shaft. But he did not speak as his mind was filled with bestial lust; the only thing on the Archer's mind was the desire to fuck Rin just like she wanted.

And she was moved up and down; Rin's breasts moved as well, jiggling all over the place but still contained within her sweater.

A sweater that was stretching even more as like with her new humongous botty, Rin's tits were now growing once again, swelling with each shake, expanding a centimeter each time they went up and down, up and down.

And that continued titties were double, even triple the size they were before, her boobies now the size of her own head and seeming to cover half of her torso.

"My boobies they are so big, and my nippies are so large," Rin moaned like a whore as Archer kept fucking her like a toy, her cunt cumming over and over again. And then, as she was pulled all the way down Archer's shaft, she felt it expand, and her mind quickly realized what was coming.

Quite literally.

Cum.

She felt Archer cum.

And cum he did, filling her womb up with his hot cock milk as the crown of his penis hit her cervix. Kissing it like her mouth has done to his earlier. Almost trying to swallow it.

And Rin came as well cumming even harder than she had ever before.

So hard, hard, in fact, her pussy juice was not the only liquid that was gushing from her body.

As her nipples were now firing a thick stream of milk through her clothes.

Rin had achieved the milky orgasm that she desired.

But Archer wasn't done yet, as their position changed, and Rin was now on her knees and hands as Archer started fucking her even harder doggy style.

And he was not stopping as the Servant of the Bow kept cumming and cumming, until all the magical energy that had been in the Command Spell was pumped back into Rin in the form of creamy white cum.

Xxx

Archer groaned as he pulled his cock out of Rin's thoroughly fucked pussy.

And EMIYA stared at her changed body, yeah there was definitely something wrong with this Grail War if something like this could happen.

The Servant picked up his friend's sleeping body and carried her to bed, but at least this experience had knocked his memories back into place due to the familiarity of Rin's rather right pussy. He hadn't been balls deep inside of her for years, going by his timeline.

And now he had a living room to fix up.

Xxx

"I can't believe that happened," Rin said to herself as she tried to put her school uniform on, as memories of last night ran on rerun inside her head.

But putting on that clothes was a difficult endeavor due to her expanded flesh, her stocking barely fit her meaty thighs, and her panties were swallowed by her going straight into her still now seemingly constantly wet cunny. She had to discard all her bras as none of them fit her ridiculous boobies, now larger than that fake Nun had.

So her uniform's jacket looked like the buttons were about to explode as they and the blouse tried to contain her expansive mammaries. Her nipples standing fully erect under the cloth, it seemingly clinging to them more prominent as the stimulation made her leak a little bit of milk that darkened the area. They were also lifted up, exposing her tunny and naval for all to see.

It would be so humiliating going to school like this, but she had to because she was the school's idol and had an image to maintain. Her fat ass not helping by lifting her thankfully long skirt up, emphasizing it even more.

Thankfully though her Servant seemed to listen to her now, even if he was a teasing bastard, a bastard with a good cock.

Rin definitely wanted more of his cum later.

With that thought, she went to school.