Days and nights and missions and assignments and all sorts of things had been blending together for a while now already, to the point that Castoria had simply found herself wandering the halls of Chaldea without a full awareness of herself, or what she had been doing until now to end up up and about this apparently late into everything.
 
All she knew and cared about right now, was the fact that she was hungry and knew the way to the cafeteria. She could figure out the rest later.
 
—Yet before she even got that far, she found a different option, quickly taking a few steps back and nearly hiding behind the frame leading to the actual eating area. For as little as they meant in the grand scheme of things, there were still defenses in place to try and deter midnight riders, such as herself, Jack, Nursery and so on, from taking insufficiently prepared supplies. Getting to the food, as such, would be a challenge… Were it not for the presence of someone sitting in the cafeteria and simply holding a cup of tea as if just warming her hands was enough.
 
Even with Castoria’s temporary loss of place in time and space, she could tell that Mashu was in a state of her own. Her clothes were almost obviously only recently, and rather poorly, thrown on, her hair was matted, her expression relaxed and half-asleep… Castoria still made sure to approach carefully and stealthily, only further confirming the theory as the Shielder smelled like sweat and sex, carrying Gudako’s almost distinctive scent.
 
Almost ironically, Mashu was rather defenseless in this moment, allowing Castoria to put her hands on Mashu’s shoulders from behind, startling the Shielder for a moment and prompting her to look up, only to see the inside of Castoria’s gaping mouth as she began to descend with an unhinged jaw that effectively took Mashu’s entire face in one go, followed by a tongue starting to lick Mashu’s scared expression to try and scrape off some of the dried juices.
 
A quick hand smacked the tea away before Mashu could try to use it against her, her head descending as her other arm tried to make Mashu’s ascend deeper. Putting both hands under Mashu’s shoulders and lifting like that, combined with a poor decision on Mashu’s part to grab the back of Castoria’s head and try to pull her away, allowed Castoria to lift up the Shielder a lot faster and with more support, making quick work of her head and starting to scrape her teeth against the neck in a barely consciously learned intimidation tactic.
 
Mashu’s clothing was thankfully, currently, light, consisting of a rather loose dress shirt that just barely covered up the fact she was wearing a bra at all, while her legs were only clad in pantyhose over a pair of panties. It wasn’t much in the way of clothes, but Castoria knew that it would get in the way of some of the taste, as well as that she couldn’t really strip her of even that much, mostly due to hunger and some level of awareness that it was best that no one finds out about this using the sort of evidence that discarded clothes would leave.
 
Instead, she struggled a little as she missed the back of the dress shirt’s collar, leading to it getting caught on her chin for a few moments before she managed to get it where it belonged, giving Mashu more time to try and get some final struggles in with her arms before Castoria started to limit their movements by going over the shoulders and thus starting to pin the arms to Mashu’s side.
 
Mashu’s protests started to get more vivid, though Castoria wasn’t really able to make much sense of it, simply feeling the vibrations in her throat and body, reducing the effectiveness by a lot. Instead, she focused on pushing Mashu’s massive bust into her mouth. The gradual incline of having started head first like this made it easier, Mashu’s breasts gradually squeezing inside as Castoria slid her hands further and further down to keep a grip.
 
A few exploratory fingers did sink into Mashu’s bust from the side, mostly only finding the texture and presence of her bra instead of the soft tit flesh, but that hardly stopped the intrusive thoughts as she took advantage of the situation.
 
Castoria took a few steps back, the chair that Mashu was sitting on still pinned between the two of them and now leaning on its back legs as Castoria tugged and bounced Mashu for a few moments, feeling the jiggle as it filled her cheeks, further enforced as she supported and bounced the bottom of Mashu’s hefty chest to send stronger ripples. The feeling continued even after the bust fully passed her lips, continuing deeper and deeper inside her mouth and the entrance to her throat with every swallow.
 
Feeling Mashu’s head just starting to enter her stomach, very slowly filling her up, Castoria took a very short break, simply to ease the chair down to the ground and avoid a loud crash before she continued, both hands on Mashu’s ass and pulling-lifting her up into the depths of her throat, crossing the midriff as Mashu’s legs continued to flail through the air and find no purchase.
 
Her stomach expanded appropriately as her food was sent into it, bulging out slightly at first with the indent of Mashu’s head as she worked her way to Mashu’s ass, sinking her fingers into it to see if she can squeezed anything out for her to further play with when she gets to that part.
 
Feeling increasingly and exponentially filled, Castoria picked up the pace, shoveling more of Mashu into herself, almost sensually dragging her hands down her length and pressing her fingers into the thighs instead, her tongue exploring the ass and gradually coming to… An almost disappointing discovery.
 
The taste of sex was still there, not even washed off, Mashu most likely simply having put on her panties without having bothered to clean up, locking the tastes to her crotch, but there wasn’t any new wetness present, no excitement in spite of Castoria’s attempts at some measure of foreplay and messing with the Shielder like she had. Even rubbing the insides of her thighs failed to get anything going…
 
She would not let her meal be spoiled by this alone though, pressing her tongue against Mashu’s taint, crossing the distance between the soft ass and the, admittedly fairly, dry pussy as if she had the strength to push it down with her tongue alone. Powerful swallows did the job just as well though, pulling Mashu deeper still, more and more of her body entering Castoria’s stomach and expanding it, very slowly returning some measure of movement to the Shielder.
 
Right now, all Mashu could do was squirm and thrash in an almost snake-like manner, trying to do as much as she could with the top part of her body, trying to headbutt the lining of Castoria’s stomach in an attempt to set herself free. It was useless however, no amount of movement getting her any closer to freedom as Castoria simply swallowed along the length of her legs.
 
No longer having to hold her food still, Castoria put her hands on the bottom of her stomach, providing just a bit of added support as she finished off the last of the Shielder. After her thighs, there was simply nothing else interesting to her, allowing her to make quick work of the rest of the legs and finally close her lips properly.
 
In spite of the size of her meal, Castoria found herself still rather tired and because of the size of her meal, Castoria found herself suddenly at the edge of a food coma… So she did the only natural thing and started heading back to her room, content with the results and not quite aware of the fact that Mashu couldn’t just be resummoned after the fact…
 
o.O.o.O.o
 
Castoria’s eyes practically snapped open as realization dawned on her.
 
It was, by that point, too late. The Shielder had struggled and gone through it all, Castoria simply having sat down on her own bed and leaned against the massive stomach, wrapping arms and legs around the protrusion. It wasn’t until Mashu started to soften up that Castoria remembered and quickly tried to do something, anything, about it.
 
She considered throwing up, but the movements already felt like they were putting the already softening body through a sieve of sorts. If she wasn’t dead and gone now, then she certainly wouldn’t survive the trip up her throat and the mess that would be caused would likely be the same regardless of what hole she went through.
 
It was, then… Better to just let her go through the process, wasn’t it? She could just… Leave her there, pretend like it never happened? She didn’t do it on purpose! …Did she? She was delicious though.
 
Medea, maybe? Or Asclepius? Maybe someone could properly revive Mashu after the fact? Even from this!? There had to be something she could do!
 
—She didn’t really get a chance to try anything as duty, work rather than nature, called. Her stomach jiggled with its contents as she got out of bed on sheer reflex. By this point, when it was time, it was time, her feet working effectively on autopilot as she went through theory after theory of things she could try and solve this problem with.
 
o.O.o.O.o
 
They just kept going. When one fight ended, another one seemed to immediately start in an endless string of battles as Castoria felt Mashu moving inside her. Not as a living being, but the gradual, growing, need to dispose of her. She had been gradually moved from her stomach into her intestines, building up more and more shit that, in spite of all the magic she could muster, left her feeling like she was going to burst any moment now.
 
And Gudako kept asking about Mashu. No one had seen her since last night, which was rather problematic. Some of the other Heroic Spirits kept shooting Castoria seemingly knowing glances, yet nothing happened and no one said anything. She hadn’t gotten discovered.
 
Her stomach gradually got smaller, bit by bit, revealing more and more of her body as it no longer concealed it. Her clothes felt tighter and tighter though as the Shielder became a layer of fat, her bowels getting filled up as they worked through the morning and into the afternoon.
 
The few quiet moments she managed to get were too public. Someone would have seen her, would have found out. She couldn’t just shit Mashu out anywhere either. She had to be careful with how she ends all of this, as much as she wanted this semi-self-imposed torture to just end.
 
Noble Phantasm after Noble Phantasm, Skill after Skill, Attack after Attack…
 
At this point, the guilt was almost entirely overwritten by the sheer and absolute desire for it all to end already!
 
o.O.o.O.o
—Scat Warning—
“I’ll go check in Mashu’s room!” Castoria declared, running off. She was running out of options even faster than she wanted to be bolting through the halls. At this point, she didn’t even care if she incriminates herself by doing this! She had magic! She could probably find a way to avoid detection if anyone even tries to look into things!
 
If not for the fact another sudden movement might cause her to burst, she would have rushed, but as it was, she walked with false calmness until reaching Mashu’s room, opening the door and walking over to the bathroom to the side. She didn’t even bother with her clothes and just let them vanish through magic before sitting down and letting loose.
 
The first bit was so pressurized she felt as if it might break through the bottom of the toilet, her legs twitching and body shuddering as she suppressed moans of relief. It quickly turned into a fight for her life though as a sufficient amount of Mashu’s weight had been turned into pure waste, sheer shit, all of which was pushed down the length of her bowels, shifting her centers of weight and balance around.
 
She knew it wasn’t actually doing so, but as she felt the continued feeling of shit leaving her ass, she felt as if her entire body weight and internal organs might vanish alongside everything else. Worse yet were the small bits that hadn’t properly been broken down, leading to slightly harder parts of the whole process, forcing her to squirm around a bit before the temporary blockage was removed and she could keep going, feeling herself getting emptier and emptier.
 
Log after log, the sound of water eventually disappeared, replaced with a slightly squishy sound as shit collapsed under and into itself, unable to stay as one continuous exit, yet still refusing to let Castoria’s ass closed as the pile of shit outgrew the level of water, and then caved in under its own weight to provide more, building a mound of scat that slowly tried to reach up to Castoria’s ass.
 
It was the most relieving torture session that Castoria had ever been put through, one that took her breath away—and then made her wish she didn’t need to breathe as the smell kept building up, forcing her to use a bit of magic to deal with it and not suffocate in any way.
 
Strength gradually drained out of her body, almost keeping pace with the excrement, until her lower body went numb and only vague feelings informed her that it was still going on. The whole process could not have lasted more than five minutes, yet it felt exponentially longer.
 
It was then made even longer as she stayed seated on Mashu’s porcelain coffin, unable to move properly for a while longer, nor willing to trust that it was over until she couldn’t feel anything for a sufficiently long time.
 
With a hand on her stomach, feeling empty as if she truly had shat out an organ or two, Castoria gave a final bit of focus to simply clean her ass, inside and out, with magic. There was no way to reach back without staining her hand. –A slight error in judgement and depth further led her to give herself a borderline enema, clearing up even more things that otherwise might have waited a few hours at the very least.
 
Leaning forward and getting back on shaky feet, Castoria gave one final glance back at the pile of shit she left behind, almost entirely filling the bowl and threatening to spill out. It would just take one action to flush it all and hide as much evidence as possible, maybe even negate the possibility of Mashu’s return… But she wasn’t that cruel.
—Scat End—
 
With the lengthy disposal process done, Castoria looked on and found a sufficiently full length mirror, catching sight of her new self.
 
She hadn’t really been able to focus on the changes until now. No one really mentioned them either, in spite of being aware that she had eaten someone, or something, massive enough to fill her up like it had. Even Gudako didn’t question it too much, though she was also just spiteful enough to make her continue to work even in that state even without the extra bit of knowledge…
 
Her chest… Hadn’t really increased by all that much. Her clothes felt tighter in general, but aside from a certain layer of fat, it didn’t feel like her bust got any proportionally bigger. Instead, everything seemed to be focused on her lower body. There was a layer of fat everywhere, of course, nicely spread and making her more plump than she had been before, but in a healthy sort of way.
 
Her hips though felt a lot wider than they should have and her legs in general were… Different, to say the least. A lot of walking, jumping, running and so on, along with just barely enough food, had caused her legs to be rather thin but decently built and showing muscle. Now, however, those muscles were just about fully hidden and she had the actual ability to sink her fingers into her thighs.
 
Exhaustion aside, at the very least, she didn’t feel any weaker than she had been before, so her legs were probably in the same state they had been before, just… Better hidden and better looking? It wasn’t much, and it was actively detrimental in her current state, but it was definitely a bonus.
 
She gave her lower clothes a few experimental tugs and movements… Her tights felt strained to the maximum capacity, just waiting for her to make the wrong sort of move to tear themselves open and relieve the tension, and her panties felt like they could snap at any moment. If not for the fact she put the clothes back on by almost the same magic she had removed them with, she was more or less confident that she wouldn’t have been able to get her panties all the way up her thighs, or her tights on without tearing them in the process.
 
It's been so very long since she last needed a new wardrobe…