Grimm invited his beloved Pure Vessel to a party, and then indulges himself a little too much.

This story is a gift for salaxle42 on Furaffinity! I wrote this story for them in exchange for this piece of art of one of my OCs. - https://www.furaffinity.net/view/59077170/

Thumbnail from this art given to me by @OpalNiko / @OpalScrumptious on Twitter/Bluesky. - https://x.com/bpacc437/status/1777563641383989311/photo/1

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It was a gloomy Hallow’s Eve at the Grimm Troupe, which was fine. That’s how the Troupe Master liked it. Maroon lanterns and towering Grimmsteeds beckoned visitors towards Dirtmouth’s center, where the mountainous tent concealed the main event inside. Grimm himself frequently surprised visitors as they entered, bursting forth in an explosion of flame, only to knowingly subvert his menace and reputation by presenting them with his outfit for the night: a maid outfit which showed off his lengthy legs. He flirted here and there with the more receptive types, even though for this show tonight, he had eyes for one only. When it became apparent that the one he waited for was running late - probably being held up by some duty for their father - Grimm retreated into the dining hall, which took up the entire stage at the heart of his tent where he usually put on dances, duets, and duels.

After some time chatting up visitors and tasting some of the lovely food and downing a couple of drinks for the purpose of socialization, Brumm sidled up to his Master. Grimm turned to address the bug who was, among other things, his sub-ordinate. “Brumm, oh Brumm! You’ve really outdone yourself with that outfit, come here and let me see!”

“Master, you really shouldn’t make a scene,” Brumm said gruffly, very glad his mask was covering his blushing face as Grimm traced a finger across the too-tight sleeves and chest of his tuxedo. “I know it’s more… revealing than what I typically wear on such occasions, but seeing what you were wearing, I assumed it would be permissible.”

“It is more than permissible, my dear servant! As a matter of fact, I expect you to wear that outfit at all official gatherings of the Troupe from now on.”

“Wait, what? But this is-”

But Grimm was already turning away, hoping to see that his beloved had arrived. He was overjoyed when he saw them enter. It wasn’t exactly difficult to pick them out of a crowd, what with how they towered over everybody nearby with those ornate, blazing-white horns of theirs. Much to his joy, Grimm managed to pick out those figures of faux-ivory across the room, and as the nearby bugs parted, the Troupe Master saw that they were generally keeping to their lonesome. Well, he knew exactly how to fix that!

Drink swirling in his hand, he approached the tall and imposing Knight, who seemed to have come straight from the White Palace still adorned in their royal armor. Grimm made sure to swing his hips and he came up to them, and hiked up his skirt a bit to show a precious bit more extra leg as he caught Hollow’s eye. For their part, the Pure Vessel waved and beckoned him closer, eyes focused on where the Troupe Master wanted them to be. “Welcome, I’m very glad to see you made it!” Grimm said, lending on the table next to where Hollow was standing. “I must say, this whole endeavor would’ve meant nothing if you hadn’t been here.”

Hollow nodded and reached for Grimm’s hand, giving it a squeeze. They turned and watched the floor of the party together, looking at the dozens of tables and even more dozens of guests, all milling about and enjoying good food and swell times. As they watched, Grimm’s fingers started walking up the Pure Vessel’s arm, and then down their chest to their long and supple legs. He gave their thigh a squish. “I must say, coming in your own regal attire was quite the decision! I imagine you’ll catch the attention of many - but none of their gazes shall rival my own, I assure you.”

The Pure Vessel turned to them and, without the words to say what they really wanted, pulled Grimm into a hug, their long arms circling him and pulling the Troupe Master against their coo Void. Grimm, who was starting to feel a little inebriated and more impulsive than usual, wrapped his own hands on a point far rounder and lower than where Hollow had rested their arms. He gave the rump a grip, feeling it squish under his fingers, and chuckled.

“Now, Vessel,” Grimm began, leaning his head closer to Hollow’s, “why don’t we go somewhere a bit more private? After all, I didn’t put on an outfit like this for mere jest!”

If they were capable of it, the Hollow Knight would’ve flushed deep red as Grimm gave them a big smooch on the shell, before leading them by the hand through the throng of guests to a private dining area which rested on the other side of a dark red curtain. The bugs here were few and far between, with only those Grimm respected a fair bit being allowed into this more private sanctum. There were round tables sitting about, with waiters providing only the best food and drink to the most discerning of clients. Glasses of wine were being poured liberally, and at one of the room stood a closet as tall and intimidating as the Pure Vessel themself.

“Take a seat, take a seat!” Grimm said, luring his guest to a table and seating them. “Here, let me show you my private collection of wines - they’re all in the extra large size, so feel free to imbibe as much as you desire!”

Showing off his ass through the maid outfit, the Troupe Master walked over to the cabinet and removed the largest bottle he could find, glad that when he turned around he saw how Hollow’s eyes had been trained on his behind. He walked back to the table, and poured two glasses. A small one for Hollow, as drinking for them was more a formality than actual pastime, and a large one for Grimm, who felt like getting down and dirty tonight.

“I must say,” Grimm said, taking a long gulp of his wine, “I would’ve preferred if you showed up wearing a little less! Why don’t I get a maid dress fitted for your size, hmm?”

Hollow reached a Void tendril into their wine, absorbing it as they shifted under Grimm’s flirtatious gaze. Under the Table, the Troupe Master gave their legs a little teasing kick, and he winked at them, taking another sip of his wine. “And then, once we have matching outfits, why don’t we do something special with them? Maybe put our lovely forms on display?”

With each successive flirt, Grimm drank some more of the wine. And with each sip of the wine, he became more bold and adamant in his flirts. After tossing back several entire glasses, Grimm had done away with most of his inhibitions, and had progressed into saying things like, “I had the Troupe make a new bed special for tonight. Why not come and give me a hand with it?” or “If you’d like, I could let you use my rump as your pillow once we settle in!”

Eventually, tired of sipping from mere glasses, Grimm turned to the bottle itself. It did little to quench his insatiable thirst, and finally, in one large swig, he downed the rest of the stuff in a display which impressed Hollow greatly. He chugged and chugged, until he finally removed the bottle from his lips with a pop!

“My, what fantastic service tonight, my-!” Grimm paused for a second, feeling something coming up his throat. Then, he let out a large and hearty Brroooooooooowrprprprprp! That shook the table and the glasses on it, before clearing his throat and continuing. “Such fantastic service. Yes. That is what I was trying to say. Now, why don’t you come over here and take that tight armor off?”

Hollow flushed under the new rush of attention which Grimm foisted upon them. The Troupe Master was always a bit playful and flirtatious, but those aspects of his character were amplified by drink. His long fingers felt up and along the Pure Vessel’s legs and chest, and scratched the underside of their chin in a playful manner as he told his favorite Vessel of all the things they could do together once they were alone.

However, as Grimm drank some more, a more base hunger was beginning to build up in his gut. To stave it off, he shoveled food into his mouth in between his flirts and romantic gestures. The butlers and waiters brought more, and it all quickly vanished as if into air. Such paltry offerings weren’t going to be enough, he knew. Normally, Grimm would have enough decorum and decency to hold his rampant hunger until he was in a more private manner, and could eat as much as he wanted in as messily a way as possible. Drunk as he was though, Grimm had no such inhibitions, and he ate and ate. He ate so much that, to his drunk and starved mind, everything seemed a delicious delicacy.

So, when a particularly tasty-looking partygoer made the mistake of coming too close to his table, how could one expect Grimm to resist?

His long arms grappled the small bug, who gave a shocked gasp, thinking they were in for a hug or something. Instead, they had only time to give a second, much more shocked gasp before Grimm had opened his mouth wide and had swallowed them entirely. He did it so casually, like he was eating one of the many dishes laid out before him. In the darkness and sparsely-populated private room, nobody noticed the display except for Hollow, who was taken aback but not really surprised, as they had seen Grimm devour bugs like that before. What did take the Vessel off guard though, was how the Troupe Master got up and shot a wink at them as he wobbled his rear before making his way towards another group of guests.

The Pure Vessel watched as Grimm sauntered up to them, his stomach still full of the first thrashing bug he’d eaten, before eating all the guests over there, too. It happened too fast for anybody to object or react much, but the ruckus they caused with their screaming and the like did alert everybody else in the room that something else was up. Grimm took his short time to swallow each of his current targets, putting them in his mouth and swallowing heavily, tracing their descents down his throat with a single, long finger. After they were all gone, Grimm’s stomach was large and thrashy indeed, and the drunken Troupe Master felt he needed to say something or other to the frightened guests, many of whom were starting to make their way towards the main room. Grimm followed them out, and in the center of the main room of the tent, gesturing with a hand to seal the doors to the outside, he began to speak.

“Now, now, what is with all of those frightened faces? I assure all of you that there is nothing to fear, by the end of tonight, all of you shall be much better off!” He licked his lips. “After all, I am about to give all of you a show to die for!”

Hollow watched the display with some amount of confusion and fear. But those emotions were softened when they caught a glimpse of Grimm’s rear, which was already growing from the few bugs he’d taken in. Every move of the Troupe Master’s was making it shake and wobble, and they couldn’t help but wonder and envision how it would look once he’d eaten even more. So they looked on as Grimm fell on the nearby groups of insects, grasping them up with his arms and wings, and then stuffing them all in his mouth. Sometimes he’d fall on a single one and gobble them up, and other times he’d swallow up to half a dozen at once, their forms filling out his throat in a single thick bulge before they landed in his rapidly-filling and stuffed belly.

Brumm came up next to the Pure Vessel as Grimm made his way through a dozen or more guests. He was stalking towards the blockaded exit doors where most of the remaining guests were trying to escape when Brumm sighed. “I knew I should’ve locked up that stuff. He always gets like this when he’s intoxicated! Now we will have to sew an entire new set of clothes for him again.”

The Vessel rested a hand on Brumm’s shoulder in camaraderie as Grimm fell on the group, tearing through them and giving out mighty belches as he sent them to his stomach, which was now churning like an engine as it made its way through all the new food it had received. Still, even as Brumm talked on to them, Hollow couldn’t move their eyes from the swaying and thrusting rump of the Troupe Master, which was now really filling out those dress pants of his, filling them nearly to bursting, to the point one could see each individual asscheek through the fabric. It was a miracle it held together, really.

More heavy gulping swallowed up the panicked and frightened cries of the partiers as Grimm finished off the last of them, the final delicious bug of the several dozen sliding down his throat to join the others already melting and being absorbed in the hot gut. Finally feeling satisfied with his hunger, Grimm cast a look behind him and saw Hollow and Brumm watching. He gave a low chuckle, and wobbled his massive hips and ass to the two of them, and then gave his hips a fat slap, making the expanding weight ripple. “I see you two are quite enchanted by this, aren’t you?”

Brumm, trying to retain the last strands of his professionalism, remained still. Hollow on the other hand couldn’t resist coming forwards and feeling up that fat rump through the stretched pants, which still somehow held together. Their hands pressed into the soft flesh, fingers sinking in deep as the plush increased in size, mass, and density. Hollow hefted the rump, and was amazed by how heavy it already was, even with a couple dozen bugs still left to digest in Grimm’s stomach.

“If you enjoy this, you should see how it looks after I gussy it up a little,” Grimm said, standing up and making every part of him wobble heavily. “Now, where did I leave that book of spells?”

“Master, I really must insist-” Brumm tried to interject, guessing where this was going and assuming that this meant he was going to be sewing the world’s biggest pair of pants tomorrow morning.

“It’s alright, Brumm! Let us try and entertain our guest.” He held out a hand to Hollow, and the Vessel took it as the Troupe Master moved to a nearby bookshelf. Grimm ruffled through it, the screams in his gut vanishing by the minute to be replaced by more stomach gurgles, until he found what he was looking for.

“Here we are!” Grimm said, holding up a grimoire like it was the greatest treasure on earth. He flipped through the pages until he found a page which depicted a bug with a very, very, very, very, very, very, very, very, very, very, very, very, very large posterior. “Let us see how this will improve this body, hmm?”

Grimm drew a finger across the page with the appropriate spell. Flames and sparks flicked up from the paper as he did so. With the sparks, he drew a strange symbol in the air, and then took that symbol towards himself before shoving it directly into his chest. The figure dwelled for a moment on his flesh before vanishing, and initially, not much changed. His rump was growing bigger, sure, but that was more than likely due to the bugs currently churning in his stomach than from any magical spell.

Then Grimm’s already-impressive plump, but especially his rear, doubled in size.

And then kept growing.

“There we go!” Grimm said, watching as his curves expanded to be larger than any door in Hallownest, and indeed larger than any wardrobe Brumm had ever seen. He reached his hands back, and felt up his immense ass, which was larger than any bed he owned, and it took both him and Hollow working together to lift either cheek through the pants, which seemed always on the point of breaking but never quite got there. He slapped his stomach and chuckled. “And just think - we still have all of this to go through. Why don’t we go somewhere more… private, my beloved Vessel?

Hollow assented immediately, and not just because, with no other party guests left, there was nobody except the rather glum Troupe to commiserate with. They wanted to see Grimm get bigger, they wanted to see him get rounder - and to feel it all happen. So when the Troupe Master took them by the hand, and led them to a grand private bedroom with a bed somehow large enough to fit Grimm’s new body on it, they raised no objection.

Grimm entered, and literally collapsed on the bed, pulling Hollow down onto it alongside him. They fell into Grimm’s arms, and into the bed of fat which he was swiftly making, the churnings and gurglings of his stomach still ongoing as some last poor souls were stewed away in there, their forms and bodies and souls being reduced, even now, into sludge in the Troupe Master’s stomach. His gut was nearly as wide as the mattress they laid upon, and his hips were large enough to destroy any entryway or portal or whatever Grimm would inevitably have to negotiate after the drink wore off.

“Now, isn’t that fun, my Vessel?” Grimm said, patting Hollow’s horns as they kneaded his stomach, the endless doughy rolls. “That’s it - use it all you want. I know you desire my body so!”

The Hollow Knight squished everything they could. They played with Grimm’s very ample hips, his massive and sloshing belly, and especially the rump which, even from the Troupe Master’s front, could be easily seen. Grimm pushed their face into his chub, and rolled over and let Hollow play with his still-growing rump. He just kept growing, and getting bigger and bigger, until the very last guest had finally been churned away. By that time, Grimm was not only basically asleep from the effort of having eaten so many - he was large enough to give even his sister, the Radiance, a run for her money in terms of size. He’d have to go rub that in her face sometime, literally.

The Troupe Master tugged the Pure Vessel in close, and cuddled with them like a teddy bear. “Ah, how exhaustion overtakes me! I’ve had such an eventful night - as I’m sure you have as well. Tell me, Vessel, why don’t we have some fun with all of this weight tomorrow?”

There was no hesitation in how hollow nodded. Now was there any doubt in their movements as they cuddled and played with all that fat as the two of them dozed off into a peaceful and pleased sleep.

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