A/N: Remember you can always find me and see even more of my content, and see it earlier than anywhere else, over by a certain site that rhymes with Rate On, or a site known for its rather questionable questing practices, under the same name~
Mashu Kyrielight was arguably the most important servant of Chaldea. Not the strongest or most skillful, but certainly the most important, the final line of defense before the Master, the permanent companion that had been there since the very start of the desperate fight against Goetia.
And she was also a very good looking young woman, who tended towards training in her very tight and form fitting leotard, that was her servant outfit. Without the armor, it was a very lewd outfit. It wasn't so shocking, then, that she would have... admirers, so to speak.
Naive and friendly, Mashu didn't really know that there could be an enemy within Chaldea, much less so a talented Magus that had managed to create a method to hijack her contract with her master. A technician, bald, fat and with hygiene problems, but good at his job, enough so that while avoided by his peers, he was allowed to stay out of necessity.
Mashu, ever friendly and kind, didn't heed others' words when told to stay away from him, and when he invited her to his room, she accepted the invitation, thinking there couldn't be much truth to the accusations.
That is, of course, until she saw a familiar tattoo on the back of his hand as he raised his right hand at her, fist already formed. "What is the meaning of-"
"Mashu, by the power of my command seal, I order you, become gullible and suggestible!"
Normally, the command seals had restrictions on them... the seat that Ritsuka had did, at any rate. This man had more or less jailbroken those commands, and given the seals their original potency, allowing him to employ them for effects they wouldn't usually be capable of in Chaldea.
Mashu's body froze and stiffened, as her eyes became half lidded for a second and she wobbled a bit, shaking her head as if trying to get everything back into focus. "What's going on..?" she asked. "What was I doing?" she asked.
The fat man grinned. "Oh, you just asked me to have sex with you so insistently, I couldn't say no, so I brought you here," he said, as he began to fiddle with his belt.
"Is that so?" Mashu asked, tilting her head to the side. "I guess you're right," she said, nodding to herself.
The man was already almost entirely naked, wearing only his overstretched underpants, when he was suddenly struck in the chest, and thrown like a ragdoll at his bed.
Mashu cracked her neck, stretching her arms, as she flexed her powers and turned her casual outfit into her leotard. Her hands reached for her crotch and slipped it aside, revealing her tightly sealed pussy, which she began to massage and finger. There was a strange, kind of disturbing gloopy sound as she did, and the bald fat man watched with horror as a nine inch penis grew from where Mashu's clit was supposed to be.
"W-W-What is this!? This is nothing like my hentais!" the fat bastard protested.
Mashu licked her lips, giving him a lewd and disturbingly scary grin as she stroked her stiff cock.
"Where did that even come from!?" he screamed.
"Oh this?" Mashu asked, as she used one hand to stroke her dick and the other to play with her large, heaving breasts. "I got this from Mistress Scathach," Mashu said. "We took turns using them on senpai back in the summer of 2016," she said. "Good times."
"That's- I'm not into that, not into that at all, just- just let me use your-"
"No can do," Mashu said, shaking her head. "My pussy is for senpai only," she said. "I will only have senpai's babies."
"I got it, I got it- by the power of my command seal, go back to normal!"
Mashu smiled. "But I am normal..." she said.
"SHIT!" the fat bastard said, as Mashu advanced on him and with a swift move, left him bereft of his underwear. Despite his usual smell, it seemed that he generally kept clean, just was a sweaty individual by nature and didn't use enough perfume or body deodorant. Mashu licked her lips once again as she turned him so he was on all fours. He'd even shaved his ass!
"You're ready for this," she mused. "Do you have a developed butt?"
"Wha- no! I'm not gay!" the fat bastard protested. "I just- I like rimjobs, alright!? That's not gay!"
Mashu nodded. Then she gripped both of his hips and lined herself up.
"Wait, no, stop, I- by my command seal I order-"
But she didn't stop, instead plunging the full length of her penis in a swift stroke, cutting him off and causing him to scream incoherently in pain. "Such a tight, virgin ass!" Mashu groaned in pleasure. "I'm gonna take my time enjoying this!" she said, as she began to pound him harsh and mercilessly, her vastly superior strength and endurance as a servant allowing her to immediately begin with a strong and powerful rhythm.
She didn't waste time on foreplay, this was about her pleasure. Mutual pleasure or servicing another was for when she was with senpai, but someone like this? This was purely for her satisfaction, and hers alone.
"I'm sorry, I'm sorry!" the man shouted, as his ass got railed by someone whom he couldn't escape at all. "I promise I'll never do it again! Just stop!" he said between pants and moans as his anus was enlarged and reshaped by Mashu's prick, grown slightly more as she reached her full mast erection. "Pleeeaseee!"
Mashu giggled. "They all talk like that," she said. "And then just like senpai said, they become cock hungry bitch bois... You and every other member of the staff..."
"No, please! Please, don't-"
Mashu leaned forward, close to his ear. "Did you really think we didn't notice?" she asked, as she slowed down the rocking of her hips. "You've made a terrible mistake, and you're going to pay for it with your body!"
The man screamed as Mashu began to pound him with her strength and agility as a servant, using and abusing his endurance to keep going and going, even as she forced his body to submit to hers, for his inferior human self to submit to her superior demi-servant physique.
Mashu even reached for his penis, feeling a little bit sorry for him. It was big, seven and a half inches long erect, and fat and meaty. A good cock. "This cock is useless," she said. "Bitch bois don't need dicks this big. Should I remove it?" she asked.
"No, please!" the man begged. "Anything but that, please!"
Mashu laughed as she began stroking it, slowing down her hard pounding to a soft, mellow rocking of her hips. "Okay, we'll let you keep it," she said. "But this body..." she muttered, at the gross and rather unappealing body of the man she was fucking. "It simply will not do!" she said. "You'll begin working out regularly and eating better from now on!"
"W-Whaaa!?" the man asked between moans. "B-But, but I-"
Mashu grinned. "Don't worry, your workouts will be very fun!" she said. "You'll train with me and senpai!" she said. "We'll turn you into a proper bitch boi yet!"
"I- I like-"
"And don't worry about the food, because from now on?" Mashu asked, as she once again began pounding him in earnest, increasing the speed and intensity of her stroking until he came all over his bedsheets. As he did, she smiled, pulled out, and then let him fall on his side, before approaching his face and, without much care, opened his mouth and stuck her dick in. She wasn't worried about him biting, he lacked the ability to harm her. Uncaring and unheeding of his and his body's protests - they'd train those out of him soon - she began fucking his throat with wild abandon. "This is all you're going to be needing to eat," she said, her voice reaching a fever pitch as her arousal and stimulation hit a peak with his convulsing throat, hilting herself and forcing him to kiss the base of her penis as she filled his stomach with cum.
Despite her lack of balls, Mashu could fill a bucket with her load, and she poured all of it down his gullet, causing his stomach to bulge a little more than it already did. She smiled.
He seemed surprised as he found himself energized. "Do you like that? Senpai is fully human, so we needed to make sure our cum was nutritive and delicious, in that island..." Mashu mused.
Despite himself, the fat bastard could not deny how tasty the remnants of cum in his mouth were. He found himself feeling like a disgrace, like he was less of a man because of it. Mashu giggled.
"Don't worry, liking to drink girlcum doesn't make you any less manly!" she explained. "Being a rapist piece of shit does though," she added. "But that's okay. By the time I'm done with you, that useless lump of meat will just be a toy for someone to play with, and you will never even think of raping a woman again. Not that you'd want to, since you're going to be passed around for every servant to use as our cumdump. Isn't that wonderful?"
As he looked at her with horror, he could not deny the wave of arousal that struck him, at the thought of being used as a sexual aid for all the beautiful women servants of Chaldea.
Mashu smiled. "Your rehabilitation starts today! Do your best!"