A Different Kind of Costume Party (Pokemon TF/TG)

Story by Vinomath on SoFurry

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[Original Release: 10/31/16]

This was a story featuring people in an old Skype Group chat I ran. Now I run a Discord server!


Halloween had always been a favorite holiday of mine, since I was a little kid it was always up there with Christmas and my birthday. Deciding what I wanted to be each year, trick or treating, watching Nightmare Before Christmas without it feeling out of place, good times. This year was no exception, and I was holding a costume party for a few friends I had made during my writing career.

This wasn't you're everyday Halloween party though! I had bought some costumes for each person who showed up, all with one theme that'd you'll see in a moment! What a generic introduction to something like this huh? None the less! I had personally picked out a costume that I saw fit that I knew my party guests would all love!

Before anyone arrived, I wanted to put mine on first and surprise everyone. It was a Wiggytuff costume. Allow me to do a little bit of explaining. You see, everyone coming was in this big group chat filled with various transformation talent on Deviantart. One day, the idea of me being a Wigglytuff got brought up and well, it kind of stuck. So now the joke is we're one giant Pokemon guild. And that's all you have to know about this little inside joke! Now let's put this costume on!

I stepped into the costume and zipped it up, and I personally expected that to be just it. However, this was not the case and the things I've been writing about for years was about to happen to me, and most likely my party guests! My ears became much longer, pink fur growing around them while they became black on the inside. My legs were basically gone now with mere pink, digit-less feet left behind. The same thing would happen with my hands and arms. My nose was gone completely while my eyes became much larger and blue. My hair became but a mere pink curl on my forehead while a white patch of fur formed on my center. Not only that, my gender had swapped in the process, making me a female Wigglytuff through and through.

There was another aspect I hadn't taken into account after the costume fused with my new body, the mind. Many false memories were flooding in, replacing old ones as I wasn't hosting a costume party anymore to me. It was recruitment for the best Explorer's Guild in the world! There were many applicants but only a small handful were to be accepted! I even got their uniforms to make them have the appropriate bodies! it was weird that only humans responded to my posting, I didn't even know they existed! I don't know how Chatot got them but that's why he does the heavy lifting!

The doorbell rung and one of my ears perked up. "They're here!" I cheer to myself happily before walking over to the door. "Why did I make the doorknob so high for me..." I comment up to it with a frown, after all I was much shorter now. I jumped up and was able to hang onto the doorknob long enough to open the door before falling on my rump, before quickly rolling back up.

Everyone was here! The applicants were named Leanan, Thornton, Thad, Peter, Chris and Alex. The first and last ones women while the rest were males. They looked down at me quite surprised. It must be because they're seeing THE Guildmaster in person! Not many explorers can say that!

"Go ahead and get comfortable!" I cheer up to them happily, humans are very tall it seems. "Except you," I said grabbing Alex's hand. "You're first!" and with that I guide her to the other room filed with Pokemon costumes, handing her a Magearna one. "Chop chop! We have to be out and ready to move in twenty minutes! I'll give you some privacy!" I said leaving Alex to her own devices.

She liked the pokemon enough, even though Johnny was acting rather odd and not breaking character, which she respected. Alex put on the costume herself. However, a sensation was quickly sent all over her body. Everything hardened as it became cold hard metal as her new "skin" became a greyish white color. Yellow patterns formed all over along with black lines down her waist. Her legs became much thinner while her feet vanished entirely. Alex's ears became much larger, turning into half circles at the top of her head, of which had taken on the shape of a gear. A red and blue light formed in the middle of her chest while her shoulders became balls and her arms flattened, now a full Magearna.

Alex hovered there for a moment, looking down at her body, but as the zipper vanished, everything made sense to her and she went through the other door in the room, which was to serve as a waiting room until the rest were ready. Speaking of which, Thornton was brought into the room.

"Alright! You seem like someone who likes tall things so I'll keep you tall!" I said giving him a Zoroark costume. "Put in on and we'll go from there!" and I left the room with that.

A wicked smile formed across his face, Zoroark was quite a cool Pokemon, and he was perfectly okay with wearing a costume of one! Though he did find it odd that Johnny was walking and talking like that. If he didn't know any better he'd say that he transformed into that! He chuckled and shook the thought away and put on the costume, and sure enough, his own changes would occur.

Thornton's hair grew wickedly long as it turned red with black highlights going down it and tied itself into a small ponytail. His face pushed out into a muzzle as traces of red fur formed over the grey. His ears became longer and triangular while a black tuft appeared at his chest. His fingers and toes became red claws as they both lost two digits. His legs became digitigrade while his arms became much shorter. On top of that, Thornon's gender had swapped like Johnny's had, making him into a female Zoroark. Just as it happened with Johnny and Alex, Thronton's zipper vanished and everything made sense, and she went into the room Alex was in the wait for the rest.

Soon after, Thad was guided in. "Now then, let's get you all snazzed up!" I said grabbing a Tsareena costume from the rack. "Nice and majestic. And hips that don't lie!" I handed it to him and left Tad to himself. He figured everyone else was probably given a costume and he did like the Pokemon, so he slipped into it, and as with the others, changes began.

Thad's hair became as long as his whole, now much shorter body while the hair turned a lime green color, splitting into three large sections with yellow-green spots at the tip. Some of his hair went upwards into a bang with a small red crown on it. Thad's legs became like pegs while white bulbs formed around his hips. Thad's arms became much shorter and thinner while two red eyelashes formed outward along with his eyelids turning the color. A red pattern formed on his torso while his sex had swapped, making him into a female Tsareena. The zipper on it vanished and there was a brief moment before everything made sense to Thad, and she joined the others in the waiting room.

Soon after that, Chris was brought into the room by me. "Okay! I think we need a little bit more fan service, so we're gonna make you nice and tall! That's how that works, right? And we don't need that, it's just a fun word!" I giggled as I handed him a Delphox costume and left him in the room alone.

As weird as Johnny was acting, there was a thrill going through his body. Delphox was one of his favorite pokemon, so the idea of wearing one for a costume was quite appealing! He slipped into it and changes began. Chris' ears grew taller as huge tufts of red hair formed on the inside of them. Yellow fur covered the top of his head with white on the bottom. Some yellow formed on her torso with a white tuft in the middle and dark red going down most of his body akin to a dress. Chris' hands became small and black along with his feet. His face pushed out into a muzzle with a small black nose as his eyes took on the same fire red. From behind him, Chris grew a large, yellow tail and along with womanhood in place of his manhood, making HER a rather nice Delphox woman.

As the zipper vanished her mind went hazy for a moment before snapping out of it, complete with knowledge of what to do. She entered the door that lead to the waiting room with the others and the last male was brought in, Peter. "So I was thinking about how we didn't have enough red gems here, and so that's why I picked out a nice Espeon costume for you!" I said as I handed it to Peter. "And a pretty cool alien tail!" and with that, I left the room to allow him to get dressed into it.

Peter looked down on it, and despite it looking kind of...well bad, he liked the pokemon enough to do it. He had figured everyone else had done the same, though it was weird Johnny's was so good. And with that, he put it on and changes ensued. Peter's legs turned digitigrade as his body was forced down onto all fours while his feet became flat and digit-less. From behind him, a thin lavender tail formed that went into a fork at the end. Meanwhile his whole body became coated in a thin sheet of fur of the same color. His face became more round while his ears became much larger, a darker purple forming on the insides. A red gem formed between his now diamond colored eyes all the while his sex had swapped, leaving him a female Espeon. And with that the zipper was gone, and the mental note clicked and she entered into the room with the others.

The last of them got brought in, Leanan. "Okay, this one's gonna be a doozy!" I giggled a bit, handing her the Arcanine costume. "I'll give you some privacy!" and with that, Leanan was left holding the costume in her hands. She always thought they looked majestic, and so she happily jumped into the costume, and transformation ensued!

Leanan's body became covered with orange fur with black stripes, along with beige fur around her ankles, torso, and head. Her nose became small and black while ears became much larger. Her bone structure changed vastly, forcing her down onto all fours. There, Leanan's feet turned into paws while a large, bushy beige tail formed. Her teeth became sharper and longer, two making their ways sticking out from her newly formed muzzle. Similar to Alex, her gender was kept in tact and the zipper vanished, and she joined the rest in the waiting room.

I returned after I knew Leanan's changes were done, and prepared myself to give a little speech. I cleared my voice and despite my new higher pitched voice, the way I yelled was deeper than before. "Attention members! Please line up!"

The sound of my voice seemed to of freighted them, as they came out practically shaking, however most seem to stop once they saw my happy demeanor. Then again, maybe they were frightened because they did all just turn into pokemon, some with sex changes to!

"Hello you four! I am the Guildmaster! And since we are just meeting each other, I decided we start off with a feast!" I said throwing my hands in the air happily, to which the rest cheered. "Food now, and we begin a brand new adventure tomorrow! Happy Halloween!"