Stacy stormed into her room. It had been a long day, and she wanted some time to relax by herself. She saw the vixen plush sitting on her bed and stopped for a moment, wondering how it got there. "Maybe Brad felt sorry for being a jerk earlier and dropped that off to make me feel better," she mumbled to herself.
She left the vixen alone, looking under her bed for something to help her work out her tensions. With nobody else in the house for another several hours, this was the perfect chance to get a little time to please herself. Instead of her usual dildo, her hand came across the cursed one. She'd already seen what it did to people, so she wasn't about to use it on herself. But she did have an idea...
She dug under her bed for a bit and produced a leather harness with a hole in the front. It was a gag gift from one of her friends, teasing her about one of her ex-boyfriends. They said he looked like he was gay, so they got her a strap-on harness so she could be on top every once in a while. The Carter dildo fit perfectly in it, and she wrapped the harness around her lower waist. She grinned at her image in the mirror, striking a pose and looking for something to vent her frustrations on.
Her gaze fell on the vixen sitting on the bed, so she picked it up to look at it in detail. "Hmm, you've got a big mouth, one that looks like it goes pretty deep, too. And also this pocket under your tail. You don't look like a puppet, though. In fact, it looks like just the right size for..." Stacy's voice trailed off as she looked down at the rubber length jutting from her front, a lewd grin spreading across her face. "I don't know where you came from, but I'm not an insensitive guy to screw a girl without even knowing her name. But since you can't talk, I'll have to give you a new one. I think I'll name you..."
Brad's mind panicked. At first, she was happy to be picked up, but something told her that if she got a new name, she'd lose her old identity. Her previous existence as Brad would be erased, and there'd be no way to get it back. Helpless, she watched her sister think for a moment, the impending doom weighing down on her.
"Vicky. Yeah, Vicky Vixen. Tacky, but it's the best I can think of right now."
Vicky, no Brad, no... Vicky. Brad? Who's Brad? Vicky felt odd, as if she had just been thinking of something but couldn't remember what it was. Confused, she tried to figure out what that fading sense of anger was, the voice screaming at the back of her mind that was already fading to silence. She figured that it could wait until later, she was being held and talked to now.
"Heh, don't worry, Vicky. This won't hurt a bit. In fact, I think you want this, don't you girl?" Stacy set the plush on the bed, her hands wagging its tail and turning its head to look back at her. Stacy made the vixen nod and lifted its tail out of the way. Vicky, meanwhile, was grateful because she couldn't do these things herself.
Stacy lowered herself, the tip of the dildo lining up with the vixen's hole. Using one hand to keep the stuffed animal steady, she pressed herself in, taking the plush like the animal it was. She'd never done this before, never actually used the strap-on harness, and she had to admit that being in control was really turning her on. As she thrusted, she could almost feel the sensation of something around a cock she didn't even have. Reaching down with a free hand into the harness, she found the switch at the base of the dildo and turned it on, the buzzing making it feel even better for some reason.
Stacy continued to thrust, and each time she did the pleasure grew a little more. She didn't notice it, but the vixen was growing too. Not only that, but there was a strange tinging in her crotch that only drove her on. The harness started getting cramped as her pussy closed up, and a penis started extending from behind the dildo. She kept thrusting as her new penis grew to peek out the top of the harness, a dark red color with a pointed tip and covered in small barbs. A fur-covered sack with two balls in it started to drop from her crotch as white fur began to spread from behind the dildo.
Vicky was now twice her size, and still getting a bit bigger as she changed. Her flat chest began to fill out into two plush breasts, as her arms and legs filled out. She was now almost five feet tall, and began to gain control of her own body. Eagerly, she thrust back into her owner, taking the dildo deep inside her. Something inside her was telling her that she'd finish growing soon, and that she'd be able to make her owner happy. She wanted that more than anything.
Stacy kept thrusting, her eyes closed in concentration as the feelings flowed through her. Fur spread across her body, black stripes appearing on her back. A striped tail began to snake its way out from her lower back as her chest began to lose definition. Soon, her breasts had shrunk back into her body as her chest barreled out. Her arms began to grow fur as her muscles bulged, gripping the now large vixen and holding her tight as she plunged into it. Her hands grew claws and pads formed on her palms and fingertips. The fur started to race up her neck as her skill reshaped itself. Her face pushed out into a muzzle bearing a snarl as she kept humping, her entire existence focused on her crotch, not even realizing she wasn't even female anymore. His ears became pointed and moved to the top of his head as they grew a thin coating of fuzz, his eyes becoming like those of the big cat he was now. As her teeth grew into fine points and his tongue became rough, completing the changes, he had the most intense orgasm in his life. Thick white cum shot up across his belly, sticking into the new white fur as the intensity blew his mind.
The vixen underneath him had stopped growing, and as her owner panted heavily and rolled onto his back. She slid off the dildo, which had shut itself off, and began to lick her owner's belly clean, the felt of her tongue absorbing the white tiger's seed while staying dry. Stacy began to purr as she felt herself get cleaned, and looked down to see the five and a half foot stuffed vixen undoing the harness and putting the gear to the side. He stared at the scene for a bit, his mind not making any sense of it at all.
Vicky was glad that her owner wouldn't need the dildo anymore. It felt nice, but it was still fake. And she craved more of that cum. She climbed onto the tiger's stomach, looking the big cat in the face. She began to slide her waist down until the new cock was at the entrance to the opening that was just used, grinning as the white furred head began to smile. "I don't think I can call you Stacy anymore, that's just not a very manly name. I'll have to call you... Steve."
Stacy accepted his new name and agreed it fit him better. He didn't lose all his memories and personality, but he didn't care that he'd been changed either. Instead, he only grinned at his new and bigger plush. "Steve it is, then. I suppose you want this Steve inside you?"
Vicky grinned, lowering herself onto the penis which had already started to leak a bit of precum again. "Oh, definitely..."
The two has passionate sex, Steve thrusting in and out repeatedly while Vicky's lining absorbed every drop of cum that came out. As Steve lay exhausted, still buried inside the vixen, he wondered just what would happen next.