This one was fun to write so I'm glad this was the winner of the Costume Party caps the lovely folks over on my discord voted for.

Art By: kemomoz

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The party had been like any typical adult-only Halloween costume party up to this point. Garish, tacky decorations covered both the inside and outside of the host’s house as people walked around to mingle and compliment one another’s costumes. Partygoers filtered in and out the doors, claiming small refuges of space for themselves around the house and throughout the brick wall enclosed backyard. There were party games, spiked punch, homemade treats, and a general upbeat yet cozy vibe to the party. That was until the host got a bit too drunk and started making a scene. Maria, who had come to the party dressed in a homemade witch costume, was perusing the festivities in the living room when the host came stumbling down the stairs shouting incoherently.

“Thish party ish…” Roy, the guy hosting the party who was dressed as some sort of warlock or wizard, stumbled a few steps down the flight of stairs as he shouted. His slurred words were enough to slice through the loud music and chatter of his guests. “It’sh… Thish shits fuckin’ boring. Let’sh get tha real party goin’!” With his one hand that wasn’t holding a half empty bottle of vodka he fumbled around in his robes pocket and pulled out an amethyst figurine. He was too far away for Maria to make out what it was a figurine of but she saw him cup it to his mouth, whisper something into it, and hold it above his head as it began to glow. Seconds after it began to glow it released a pulse of energy that crashed over everyone, blinding everyone who was caught up in the blast of purple light.

Maria brought her hands up to her face and rubbed her eyes until the temporary blindness had worn off and when she did she saw that the party had devolved into chaos. Everyone had been suddenly transformed into perverted, fetishized versions of the costumes they had come to the party in. The blonde man who came dressed up as a vampire had been turned into a woman and she had already pounced on a man and was muttering something about needing his essence as she enveloped the man's dick in her massive breasts. Hell, a woman who came dressed up as some sort of Japanese zombie was hopping around, letting her large, essentially uncovered tits bounce with her as a group of folk commanded her about. Maria could go on and on taking mental notes of the wild changes that had just taken place before her but she needed to take inventory of what had happened to herself.

The first thing she noticed, before she even looked down at her own body, was that the cool air tickled her bare skin. She looked down to see what exactly had become of her and was surprised to see that it wasn’t all that much. Her costume, save for her witch hat, had been changed from an elegant black dress with a long skirt into a black bikini with a shrug that had a small cape attached at the collar. “Huh, I guess I got lucky?” But as her eyes scanned the straps of her thong they became transfixed on what used to be her prop tome she had bought to complete her costume which was hanging from her hip. It looked different, somehow worn with age as the once plastic cover was now an elaborately decorated leather. She reached down, unstrapped it from her thong, and held it up in front of her. It was heavier, significantly heavier as it now held hundreds of frayed pages within it. Curiosity got the better of her as she unclasped the strap that was holding it shut and began flipping through the pages. It was full of diagrams of runic symbols, strange words mixed in with old English, and what appeared to be recipes for potions. She stopped on a random page and began to read. “This doesn’t make any sense. I can’t read any of this.” Her eyes panned down to a bolded phrase which appeared to be latin. “Like, what does ‘Sine Fine Lac’ even mean?”

Her entire body throbbed as soon as those latin words passed her lips followed by another condensed in her chest. The room began to spin and her ears unfocused on the sounds of the party, letting them all mingle into one jumbled noise. Again her chest throbbed but this time it was accompanied by an intense, internal heat deep within her bosom. She staggered and caught herself on the wall, the dizziness was becoming far too intense for her as she found her world shrinking to focus on just what she felt. One final throb wrecked its way through her chest as it was replaced with that same intense heat, but now it was a long, lingering heat within her breasts that became more and more intense with every passing second. She could see them grow before her very eyes, extending out from her ribcage by about an inch every second. They were full, taut and swollen as they strained against her bikini top. The pressure within them was intense and uncomfortable, only made worse by her bikini top fighting for its dear life as her milky flesh spilled over the cups and flimsy straps. “Too tight! It’s too- tight!~” She reached behind her back to untie her bikini but the cape and straps which now dug into her back made it near impossible for her to slip her fingers beneath its ties. Just as it became unbearable and restricted her ability to breathe, the knot finally gave as the fabric straps slipped free from one another. Her top went flying across the living room as her compressed breasts flung it free from her body and fell unsupported on her chest.

“Agh-hah!~” Maria gasped for air as she nearly toppled to the ground from the sudden shift in her center of mass. She found weight pulling down on her chest and stretching the skin where her tits met with her ribcage painful so she crossed her arms underneath her breasts and scooped them up in her arms. They sloshed and jiggled as she held them up, getting heavier and heavier as they continued to grow. As they expanded from each being the size of plump pumpkins to cauldrons the skin became red and flushed as their skin was pulled taut, swollen and brimming with milk. She felt like her breasts were ready to burst from the mind shattering pressure that was building up inside of them but just before she passed out from the pain it finally relented as multiple streams of milk erupted from her nipples releasing thick arcs of cream through the air. “Fu-huck!~” Maria’s eyes rolled upwards, her mouth agape as she unwillingly moaned while the rest of her body trembled. The sudden release of milk burdened pressure from her boobs was orgasmic, mind-melting even. Her legs wobbled beneath her as they grew weak before she suddenly collapsed and fell to her knees. Her pussy convulsed and twitched in rhythm with the ceaseless throbbing that worked its way from the base of her breasts to her engorged nipples. “Agh-ahhh!~ It’sh sho good!~” Her world remained small, her brain only able to focus on the singular, blissful sensation of milk being forced through her nipples with nearly the force of a fire hose. She had no idea what was happening around her, what deranged sexual acts where being performed in the very same room as her and she didn’t care. She couldn’t care. All that consumed her at this very moment was the constant relief from an unbearable pressure which eternally edged within her bosom as she came over and over again.