It's time for some cosplay

Susan's eyes stayed closed the whole trip to her apartment. She didn't need to see when she could enjoy the feel of one tongue in her mouth and another on her neck. Her hands explored the twins' bodies, first on the outside of their clothes, then pushed up their sweaters, then with free access to their DD breasts after they pulled their shirts up. She kept her eyes closed, enjoying the surprise as a round, Asian nipple was pushed into her mouth. She sucked that twin's tit and flicked her tongue against it as the other twin nibbled her ear.

"We're here!" said Troy.

Susan opened her eyes and watched the twins pull their shirts back down, which was definitely the wrong direction, but necessary for now. As they all got out of the car, she looked over everyone and got a naughty idea.

"Hey, are you guys as glad as I am that we decided to ditch that costume party and come back here?"

Everyone's clothes morphed. Sana was now wearing an orange, full body cat costume with orange cat ears and a tail, and Mina was wearing a matching purple outfit. The costumes were form fitting, showing off their curvy chests, but they covered the girls' full bodies. Caroline was wearing something a little more daring, a warrior princess costume that showed off plenty of leg and a bit of cleavage. Troy had on a full astronaut costume, which was bulky as hell. He even had the helmet tucked under one arm. Susan herself had the skimpiest costume, a generic superhero costume with a short cape and a shorter skirt.

"Oh yeah, this is much better," said Caroline, walking arm and arm with Troy. "We're going to have our own party!"

This was fun, but Susan knew there was room for improvement. "Were we wearing the sexiest costumes at the party by far?"

"Definitely!" said the twins in unison. Their cat costumes changed, with the one piece outfits shrinking to dresses that had frilly skirts that barely covered their asses and pussies. The necklines lowered to show off their terrific cleavage. The cat ears and tails remained, but the girls also gained orange and purple gloves and knee-length socks to go with their outfits. They helped maintain the cat girl look while being so thin that the girls' bodies still shined through. The twins had looked great before, but now they were the hottest cat girls alive.

Caroline's warrior princess outfit had shrunk down to a chain-mail bikini. It wasn't metal, just a regular bikini with a chain-mail print, but nobody could possibly care about accuracy when she was showing off so much of her flawless skin. The top barely concealed the redhead's large, pale breasts.

Susan didn't even have to look down to know that her costume had turned into a leather dominatrix outfit. What else would she wear?

The only disappointment was Troy. His new caveman outfit was just a loincloth and a foam club, but he didn't look great in it. His exceedingly average physique was one of the reasons she'd never hooked up with him. As they approached the door to the apartment building, Susan said, "Hey Troy, are you one of those guys who goes to the gym five days a week and gets really huge?"

"Yeah, why?"

Troy's body filled out to match Susan's idea of what a sexy caveman should look like. His muscles swelled, pecs, abs, delts, and everything else growing and flexing. He looked fucking hot, but Susan wanted more. Instead of pulling out her keys to the building, she pushed him against the door and ran her hands over his chest, then slid a hand down to his crotch. His package was hard, and definitely not a bad size, but it could be better.

"I've heard rumors about gym rats," said Susan as she handled his unit through the loin cloth. "I wanted to make sure you haven't done anything to get big that would shrink something important. Do you have the kind of huge cock that can satisfy all these women over and over again?"

As Troy's bulge grew much bigger against her hand, he grinned and said, "Yeah, it's massive! Plus, as hot as your girls are, I can definitely go all night!" He looked around nervously, spotting some people walking by on the sidewalk who were staring at them. "Um, don't you want to take this inside, though?"

Susan didn't care about being out in public. Troy had removed all her shame, and this was the result. She squeezed his crotch and said, "Are you so horny for these sexy as fuck girls that you don't care where we do it?"

Susan phrased the the question with a little more detail than she meant to, but she didn't mind the result. She could feel her own breasts grow from B-cups to C as she saw the other girls all gain another cup size. The twins changed their posture to look more playful, more flirty, more sexy-cat-like. Caroline had her hands on her hips and a commanding smile, looking every bit the sexy warrior woman. Her muscles even looked more tone, not bulky like Troy's, but she had definitely put on some amazon muscles. Susan could feel her own abs tightening and her own posture changing, making her more graceful, smooth, and alluring.

As for Troy, the question had its intended effect. He didn't even really answer, he just grunted as he leaned forward and pulled Susan into an intense kiss. They continued kissing at the entrance to the apartment building, their hands roaming all over each other's bodies.

"This is fun, but we want to go upstairs," said Sana.

"Yeah, these kitties want a bed to play on!" added Mina.