When Ritsuka falls ill from being over stressed by his harem Mash decides to deal with the problem servants, luckily, gorgon gives her the perfect idea plus a way to get a bit stronger too.

So I had this one nearly done for the better part of a month but got distracted while I tried to redo the ending. Ultimately I settled on this. Hopefully it reads well and is enjoyable.
So not going to lie, this was fueled by a crap load of sheer blind rage due to a comic done by the artist ezkerbkun did where that whore bot BB eats and horribly digests mash. The comic filled me with so much rage I came up with several story ideas to punish BB. This will not be the last time she's here for the foreseeable future, and this is the tamest of them.

---

"Senpai! Quit whining, it's just a bit of trauma"
"Begon wench, Master has agreed to spend today with me."
"Come on Master, let's go treasure hunting, and if you need some fun to help you relax, you know me and Mary are always happy to help, right Mary?"
"Of course, as long as theirs no rope involved."
"All of you home-wrecking whores better back the hell off before I burn you all! Anchin is MINE!"
"But Master was going to take me to look at flowers."
Msh watched on at the display of Ritsuka's ever-growing harem. She didn't really have an issue with him having multiple lovers. It always seemed out of his control as so many women seemed to flock to him, even goddesses adored the young man. No matter how many would-be wives and lovers he took he loved them all to his fullest, and it made him smile. That was enough for Mash to accept having rivals for his heart and time. Normally at least. But as she gazed at the chaotic hoard of women hounding him, there was no joy on his face. No happiness in his eyes, only a tired exhaustion, and a sense of misery.
He had no time, no joy, he was just beat.
"They need to go."
"Alright! Leave, Senpai is exhausted and has work to do. Shoo!" Mash snarled, flinging her shield around to get the girls to leave Ritsuka alone. Taking the chance to memorize each and every face in the crowd as she pulled her limp senpai out of the hoard.

After tucking him into his bed and making sure no one could get into his room she wandered through the halls, her mind racing with ideas of how to rid her beloved Ritsuka of the problematic harem.
"Wow, look at her squirm in there."
"Yeah, plus I get stronger for eating this idiot."
"That's cool, I wonder if I can do that."
"I don't see why not, most servants can, just don't try or know it. I bet Arthuruia could wolf down a dozen of these free servants before she's full."
Mash's gaze strolled to the voices to find the serpent woman Gorgon laughing with the much smaller Ushiwaka. There before her was a struggling woman in Gorgon's stomach, who by the outline of the gut was the assassin Jing Ke. Mash sauntered up to the two, eyeing the squirming belly quizzically.
"So you get stronger by eating them? Even though you're already max level?" she asked, a hand reaching out to touch Gorgon's stomach.
"Ughhh. Yeah? It's not much, just a bit of extra damage or health, but they add up after a while. I think my damage output has gone up about five hundred points over the last few weeks with Master doing so many friend summons." the towering monster girl explained, confused as Mash poked her stomach over and over.
"I see. That is useful. Do you get more if the servant is a higher level or rank?" an idea was already forming in Mash's mind as she wondered how many servants she could get rid of this way. How long would a single one take to digest? What would be the stat boost?
"I...don't...know...Mash..you're kind of creeping me out." Gorgon hissed, pulling away from the shielder, her unnerved feeling only growing as a wicked smile crossed Mash's face.
"Thank you, Gorgon, this has been very enlightening and helped answer a problem I was trying to figure out."
Mash's plan was laid, and she knew just who to test on first.

"Hey Mash," an obnoxious voice called, Mash felt a scowl creeping across her face just hearing the woman's voice. It belonged to the person at the top of servants that made Ritsuka's life hell, BB. A vile woman Ritsuka had accidentally brought back from a digital world connected to a supercomputer inside the moon. Ever since she had met Ritsuka she had set about traumatizing him in too many ways for Mash to count.
Mash turned to face the obnoxious AI, the two were simultaneously exact opposites and incredibly similar. Both Acted as Ritsuka's kohai, but where Mash held her senpai in adoration and strived to learn from him, BB simply liked to play the role, poorly. Both were busty shapely young women with purple hair and eyes, Mash's hair was short barely reaching her neck while sporting a large bang that covered her left eye, BB's. by contrast reached her knees. Her body was also wholly impossible for a normal human being. With a long thin neck that should have snapped under her head and hair, an equally tiny waist with massive hips, boobs larger than her head and legs that comprised roughly seventy percent of her body. Mash's outfit was a pair of black leggings, a short plain black dress and a baggy white hoodie with grey sleeves topped by a pair of glasses. BB wore a tight-fitting white top and short black skirt topped by a large ribbon and a massive black trench coat.
"So, what do you need from the best kohai of Chaldea? Maybe you want me to teach you how to not be a boring bland airhead." BB blustered, much to Mash's annoyance.
"No thanks. You've already mastered that. I'd never be as much of one as you."
"Well, at least you know you'll never be as good as...WAIT A DAMN MINUTE!"
"Actually, what I asked you here is I need to test a new way to get rid of you and some other problematic servants. So I'm going to eat you alive." Mash beamed, her hands shooting to grab BB's shoulders before she could do anything to escape.
"Like hell you a-" BB's words were cut off as Mash chomped down on her head. BB's muffled screams rippled against Mash's throat, the shielder paid no mind to her victim's screaming as she forced more of BB into her maw. She swallowed past the shoulders and worked her jaws across BB's gargantuan tits, the fatty meat ebbing through the thin shirt, the taste was foul. Mash felt her body trying to cough the vile-tasting woman back up, not from the size that should have been impossible, but rather just the taste of rotting fruit, despite the rancid taste though Mash persisted.
GLUCK
Mash forced the AI's stomach into her mouth.
"What the hell, you freak? Stop this!" BB cried in terror, her legs kicking in a desperate attempt to escape the jaws of Mash. Her kicks were so wild they sent her thigh-high boots tumbling off. Mash ignored the rancid taste of her meal as she reached the bare flesh.
SLUUURP
BB screamed as her legs shot down the hot gullet. She franticly looked around the gut, the pulsing pink walls already beginning to leak acid.
"I did it. I actually ate her. This is great news, it wasn't even that hard. This means I should be able to do it again without much trouble next time." Mash beamed gleefully, not a shred of care for the woman thrashing in her gut.
"Cool, you did your completed your weird freak experiment. NOW SPIT ME UP YOU RIPOFF BITCH!" BB bellowed from within her stomach.
Mash brought her hand down slamming into the AI's head sending her crashing down. "But the experiment isn't even close to being done. I need to know how long it takes to digest you. As well as how my stats change as a result of this."
BB erupted into even more violent squirming, punches and kicks indenting against Mash's stomach pointlessly, no matter how hard she fought none of the strikes hurt Mash remotely. With a sigh, she flicked her wrist, and a golden shimmer enveloped her hand before giving way to her cross-shaped shield.
"Wall of snowflakes," Mash sighed bringing the shield down. The next strike the artificial woman did was followed instantly by a scream of pain as her attack hit now near-invincible flesh.
"Please stop fighting and just digest already. It's important to know how many of you troublemakers I can eat in a day." Mash sighed coldly. She was normally a warm loving woman who cared for everyone and never wanted to hurt anyone. But given the horrible things BB had done to her, other servants, Chaldea's staff and equipment, her own daughters and most of all Ritsuka. Mash was more than happy to let the AI suffer.

"Let me out!" BB screamed in pain, the stomach already filling with acid, what had only moments ago been little more than a small puddle was quickly filling up to her waist. Worse still was she could already feel the gastric juices doing their job. Her flesh burned at every touch of the waves of acid.
"I refuse to die in such a stupid way!" BB roared as she punched the stomach wall, a gush of acid erupted onto her hand, the searing pain was worse than any she had ever experienced. Added to the pain was the sight of the gastric juices dissolving two of her fingers in seconds. A horrified look down revealed how much of her was already melted, her left leg was gone completely below the knee, while her right was a stump where her calf should have been. Her clothes were little more than mushy tatters, and her once long purple hair made up a large chunk of the melting slop around her, it was more than likely her massive boobs were the only thing keeping her afloat in the rising acidic river.
"Oh fuck this!" with a golden shimmer a massive medical needle manifested in her hand, the point of which was sharp enough to pierce armour, the tiny shielder's body would be child's play.
"Die you crazy bitch! Cursed Cupid Cleanser!" she hurled the needle with all her strength into the flesh, even if she didn't have much room or strength to get momentum it should have still shorn through Mash's body.
The moment the cartoonish needle impacted though, the point bent and snapped on contact with the flesh, the glass injection shattering sending glass into the trapped woman, and the force of the act knocking her into the waves of acid. As soon as she submerged she could already see the pool of acid change colour as her body dissolved in seconds. Even her vision burned away as the acid claimed her eyes. with what little remaining strength she could muster she pushed her head above the waves.
"When I resummon you're dead Kyierlight!" she screamed, tears pouring out of her burned-out eye sockets.
"You're not going to resummon. I saw to it that you and several other servants were deleted from our records, what's more if you do summon somehow in the future. I've set you to an automatic burn list so you'll be burned to mana prisms as soon as you summon. I'm never going to let you give Senpai trouble again."
Mash's cruel tone and words sent a shudder of terror through the defeated food once called BB as she sank back below the waves.

Mash poked her belly in amazement. In only a few short minutes BB was almost completely digested, what had been an annoying woman was now little more than a watermelon-sized lump of pudge that would be burned off in no time.
"I wonder if it was because she was closer to a caster than a knight class. If that is the case, then I should be able to eat several servants without being too delayed. Though the knight classes might take longer. Hmm, I should test them too, who should I test on?"
The shielder pulled a list from her pocket, a quick glance revealed her perfect test subject. Elizabeth Bathory.
Mash licked her lips as she planned her next meal.

Mash wandered into the simulator with a smile. Standing before her were dozens of women. Altera saber, Arthuria saber, all versions of Nero, Euryale and many more. All of them looked weak and tired, not a surprise as they'd all been cut off from Chaldea's mana supply and Ritsuka, it was surprising they were able to stand, but that just made what was about to happen all the easier.
"Ughh, what do you want?" Caenis growled, leaning on her golden trident for support with a yawn.
"I see you're all tired." Mash chirped, her eyes scanning the group to make sure everyone was accounted for.
"Yes, I'm afraid I couldn't sleep a wink, frankly, I'm having trouble keeping my eyes open right now." Arthuria yawned weakly.
"Glad it's not just me,"
"Any night I don't get to sleep with Anchin is a rough night."
The crowd murmured tiredly until Mash chimed in.
"It's not a surprise that you're all so tired. Given you have been cut off from any mana for the last day and a half." the room went silent, all eyes turning to her with horror. "You've all been selected for contract termination. Most of you cause Senpai no end of trouble and pain, as a result, I'm seeing to your termination personally. So, please, just behave and let it happen. It'll be easier for everyone if you do."
"What the hell have I done?!" Caenis roared, springing up from her trident, something she regretted as her body tumbled to the floor with a faint yelp.
"You have repeatedly tried to kill several of the divine servants, including Ereshkigal, Abigail, and all versions of Medusa, among others, and have threatened Senpai's safety on several occasions." Mash replied calmly, her cheerful smile now a horrifying sight to the many servants.
"It's impossible, you can't have put me on the list. What have I ever done that could upset Master?" a little girl in a green kimono with matching hair and a pair of horns from the group sobbed, a puff of fire spewing from her mouth as she spoke.
"You tried to burn Senpai because he lied about having room for dessert because he didn't want to upset you." Mash replied more coldly than before, she'd long since grown sick of the deranged dragon girl.
"But he lied!" the little girl cried angrily. The crowd erupted into angry yelling as Mash made her way toward them, her stomach growling for its meal.

Mash sprung forward, dragging the limp Caenis off the ground, the group of women could only watch in horror as the tiny shielder opened her mouth wider than any of them had ever seen and inhaled the helpless lancer. Before any of them could react or try to resist Caenis was already consumed whole as Mash grabbed at her next victim. Altera thrashed weakly as Mash dragged her across the floor into her jaws. In just a few quick gulps, the saber from beyond the stars was gone. Kiyo hurtled back, Mash's hand clasped tight around one of her white horns, she gazed up into the wet hungry gullet that was about to devour her.
"MASTER! SAV-" Mash chomped down on the dragon child before she could finish. Medb clawed at the tiles as Mash's ravenous maw sucked her body in like a noodle.
Something cracked against Mash's back, looking back she found a woman in a tiger pyjama onesie clutching a now broken polearm.
"Ugh, care to learn french from this cat?" the so-called Central American god, Jaguar warrior stuttered out. Her answer was a loud gulp that enveloped her entire body.
Stheno and Euryale both struggled to keep Mash's jaws open, their child-sized bodies fitting in her every growing maw as if they were tiny.
Mash wolfed down servant after servant until Nero was the last one left, she struggled inside the gluttonous shielder's jaws, her sword pressed up against Mash's mouth.
"If your mouth comes down my sword goes up!" the Roman whimpered. Mash responded by bringing her jaws down on the emperor, she watched in mute horror as her sword shattered as the hungry mouth snapped shut around her, one swallow was all it took to send her to the gastric tomb.

Mash rubbed her stomach. Despite being filled with over a dozen women she didn't feel full or bloated. She could already feel many of her victims starting to digest.
"Ah, to think that Mash of all people could be so ruthless. To eliminate us all, and in such an erotic way. If we are to be removed from Chaldea at least we get to go out in a sexy way." Sesshoin Kiara moaned, being sure to push her voluptuous body against the belly.
"No way am I worse than BB, where is that bitch huh?! You can't say she deserves to stay while we get melted!" Medb cried from under the pile of servants.
"You're right, but she's already been eliminated and removed from Chaldea's system. Unlike most of you, she is never returning. Most of you have the chance to resummon if you behave next time." the shielder replied calmly, she tried to rock her gargantuan body back to her feet.
"This is what it's like to be melted in acid?! This is horrible! I'll never do it again, just let me out!" the child-looking Wu Zetian sobbed.
"Hahahaha, be careful, Mash, or you might just become addicted to eating people, I know I did. You might even become an oni." Shuten cooed uncaring about her fate.
"I'm a goddess! You're not supposed to eat me! This is so undignified" Ishtar cried as well. A chorus of voices erupted from her massive stomach as it set to its task of digesting the group.
Inside the gut, many of the women struggled in vain. Mash's gastric acids had already begun softening the many women. The useless struggling only made Mash belch as her stomach mushed the servants. Despite the short time since they became his meals, many of them were already softened to the point of mush. Kiyohime was already fully digested, Caenis's muscles failed to save her from the unrelenting acid, Nero gasped for breath as the acid softened her entire body. The gastric juices blinded many of the devoured women, and the noxious smell of digesting food and flesh sickened the girls. There was nothing they could do except digest.

"I hope Senpai isn't too upset about this. It's for his own good. With luck, my stats will increase to make up for this." Mash spoke to herself as she struggled off her mountainous belly, not a thought was spared for the women she had sentenced to another death.
"Well, if he is, most of them can be summoned back. But I'm not letting them run wild like they have been. If they are all intent on acting like that and making Senpai's life harder, I'll be there to put them in their place again." Mash rubbed her gut with a scowl.
BEEP-BEEP-BEEP
"Ma...Mash," the strained voice of Ritsuka whimpered from a small communicator on her wrist.
"Yes, Senpai? What do you need?" Mash squeaked timidly, waiting with bated breath for his words.
"Soup...water...pl...please." the young man rasped weakly.
"Don't worry Senpai, I'll be right there with plenty of soup and water. Don't worry, maid Kyrielight won't let you down." she proclaimed proudly. She could hear the boy chuckle softly before hanging up with a cough. A golden shimmer melted her clothes away in favour of a black french maid uniform she wore with pride as she darted through the hall.
"I wonder what kind of soup I should bring Senpai? Chicken noodle is good, but he's had a lot of that in the last few days. Maybe miso instead? Or some tomato?" with her Senpai's request, any regard for what she had done was forgotten as she rushed to look after her beloved master.