Gina picked up the vial with "Humantaur" written on it in pen. She showed it to Veronica, who sat on the armrest to her side.
"Uh, what's a humantaur?"
"Think of a centaur, but made entirely out of human parts."
Gina thought for a moment then grinned, "That actually sounds pretty cool."
Cassie piped up from where she lounged on a seat of Elizabeth's coils, "Makes driving or riding in cars a huge pain though. Might not be the best idea. We need to go to the mall after you change."
Elizabeth spoke up from one of her heads on the torso sitting on the couch, "Uhh, I think I'm already causing a problem in that area."
Cassie nodded, "Yeah, I wasn't too sure how to broach that subject. Any suggestions, V?"
Veronica shrugged, "Only changing back. I can't teleport someone bigger than me."
Many of Elizabeth's heads frowned. A few heads nestled in the coils at the far end of the room solemnly muttered, "But I don't want to change back."
Gina looked up from the vial to Veronica, "Hey, you can make illusions, right? Like you were saying you made an illusion of a train car at one point."
"Yeah, why?"
Gina looked to her other side at Elizabeth, "Well... For the life of me, I cannot believe I did this, but I... rode Liz. Earlier. She was faster than some cars. If you put up a disguise of like a box truck, maybe Liz could move under that and we get to the mall that way."
Veronica looked over at Elizabeth and raised an eyebrow, "Explain, please."
Elizabeth blushed, "Well, uh... I can slither really really fast. She wasn't exaggerating, I was able to keep pace with the cars down on Thrushbend Road."
Cassie kicked one of the coils she was sitting on. Hard enough that she felt it, and while it didn't hurt, it did get the point across. "Come on Liz, that's fucking insane. Why would you do that?!" She kicked again, just as hard.
From the couch, Elizabeth continued to look at the vials with 1 head and glared at Cassie with the other. Quietly, one of her other torsos slithered out from the coils she was resting on and slithered up next to Cassie. Quietly one head whispered into Cassie's ear, "Please don't kick me" and with the other she barred her fangs for just a second.
Cassie looked to her right in surprise at hearing Elizabeth's voice so close to her, and leapt into the air at the sight of Elizabeth's fangs. She flapped and hovered for a few seconds then slowly descended and perched on Elizabeth's coils, no longer reclining but instead sitting like a bird. Her face reddened in embarrassment and a glint of anger shone in her eyes.
Veronica laughed, "Wow, it takes a lot to startle Cassie. Nice move, Liz. But in all seriousness, do you think you would be able to make it to the mall? It's about 15 miles away... That's a long way to travel on foot. Er... tail?"
Elizabeth silently retracted the torso she had spooked Cassie with, and responded from the couch, "Yeah, I think so. I did the city block earlier in about 5 mins and that only slightly winded me. We should stay off the highway, and if I need to I could just get off the road and catch my breath."
Veronica nodded slowly, "I think that would work then. Uhh... How hard is it to stay on your back? Would we need to drive separately?"
Cassie spoke up, "We should drive anyways. Just to be safe."
"Good point, love. I guess I'd put the illusion on... Gina? Would you ride on Liz's back to the mall?"
Gina glanced up from the potion case and looked around, "I thought we were driving... OH you mean if I drank the humantaur potion? Yeah, I'd be able to do that. Uhh... I think." Her gaze returned to the potion she held reverently in her hands.
Veronica silently vanished from the couch armrest. A couple seconds later she reappeared standing next to the coffee table and holding a clear glass. She handed it to Gina, "Pour the full vial into the glass, then drink it from the glass. If you don't like it, or can't get the hang of it, we can reverse it no problem."
Gina nodded and accepted the glass. She transferred the full vial of liquid to the drinking glass, resealed the vial and put it back in the vial case. Then picked up the vial of liquid and held it up to her lips. She was about to drink it when Cassie loudly cleared her throat. Cassie mimed standing up and then pointed at her butt.
Gina blushed as she got the point and stood up from the couch. She stepped into what little space was still available in the living room and drank the contents. Elizabeth moved her 3 lounging torsos and extended her necks as far as they could go to give her as complete a view of Gina as she could get.
At first nothing happened. Then Gina's butt began to swell backwards. She clearly felt the pressure, because she quickly pulled down her shorts and panties. Elizabeth's 360 perspective gave her a perfect view of her roommate's exposed sex. Maybe it was the proximity to a succubus, but she felt a couple of her own sexes begin to get moist. She quickly put that thought of her mind and focused the attention on her roommate's front upwards, towards her cute face.
Gina's rear ballooned outwards and quickly reached a length of 3 feet. It sagged down and threatened to pull Gina off her feet to the ground. Fighting against her shifting center of gravity, Gina leaned forward, forcing her extended posterior upwards at an angle.
Two stubs rapidly grew off the end of the posterior and in just a few seconds had grown into full legs. A butt and vagina opened up between Gina's new rear legs and the increased weight caused her back to fall to the floor. Her new feet made contact with the rug and the changes shifted from Gina's new rear to her new middle.
Two bumps grew out of the tube of flesh connecting her front and back legs, just behind her front legs. They rapidly grew into a pair of breasts, identical to the sizable ones Gina held captive in her sports bra, but freely hanging down from her middle. Another pair of arms surged out from the side of her new middle and after a couple of seconds were fully formed and moving around.
Gina tentatively took a step forward. Both her front left leg and her back right leg moved in sync. Then her front right and back left. A few more steps and she turned to avoid walking into a wall of Elizabeth's tail. Less than a minute later, Gina was freely moving her now 4 feet around.
"This is incredible! I wasn't expecting the extra boobs and arms, but they seem pretty alright." Gina beamed as she walked in a tight circle, flashing every other girl there repeatedly.
Veronica clapped and jumped up to hug Gina. Elizabeth and Cassie shared a glance that said "when will she notice?".
Gina reciprocated Veronica's hug and continued to walk around, straying out of the living room to the kitchen and coming back. Once she had completed a full lap, Cassie spoke up once more, "Hey Gina... Noticing any sort of breeze?"
She glanced over at Cassie, confused. Then she looked down and gasped in realization.
"Oh crap!"
She raced out of the living room to the relative privacy of the kitchen.
"Uhhh... Do you have some uh... humantaur clothes? That I could borrow?"
Cassie nodded and without saying another word took off from Elizabeth's tail and flew out of the living room towards the bedroom. Veronica giggled, "She just had to show off..."
Cassie returned with some clothes for Gina: They looked handmade for a humantaur shape, and maybe a size too large for Gina. A minute later Gina returned to the living room sporting her hand-me-downs. They didn't fit her hips tightly like her normal clothing, but they also were at no risk of falling off.
"Okay, now what?" she asked the room.