Tabitha is an elephant woman, eight feet tall and very plump. She has a large body with smooth gray flesh, huge breasts and big bellies. Tabitha is highly mutagenic and loves to grow, mutate, and transform, and she is also a shameless slut. She normalizes sexual activity and horny behavior everywhere she goes. As an elephant, she has four legs and large, plump feet. Tabitha also has a second face on the back of her head, complete with a luscious elephant trunk. She can see and talk out of both of her faces. On her back, she has huge breasts, just as large as the tits on her front. She has a big belly on her front and on her back. 
Tabitha walks into her office to find her secretary at her computer. It is a human girl with shoulder-length black hair and brown eyes. Her name is Macy. She wears a short, black, tight skirt, a red top, and black glasses. It's Macy's first day, so she did not expect Tabitha to be an elephant, much less one so mutated. She was used to the human women she saw working in the office. She didn't think an elephant would work there.
"M-M-M-Mrs. Elephant," Macy says, standing up from her desk. She stares up at the giant elephant before her. Tabitha has an overwhelming presence. She towers over Macy and is much bigger than she could have imagined.
"Macy, I hope you have a good first day here," Tabitha says. "I've been needing a new secretary. I've been going through girls like crazy lately."
"Yes, Mrs. Elephant," Macy says nervously, her eyes glancing up and down Tabitha's massive form.
"Now, I'll give you some time to settle in, but there are a few things you should know," Tabitha says. She grabs onto her breasts and starts squeezing them and playing with her nipples. "You're going to get really fat, and mutate like me."
"W-What? I don't understand, Mrs. Elephant. Why are you doing that?" Macy asks, confused by the sudden behavior.
"It's what happens in my office, I'm afraid. You will get very, very horny, and it will be difficult for you to focus. This is why you must have a lot of sex and play with yourself frequently," Tabitha says, as she lifts her foot to the desk and plays with her pussy.
"B-B-But, how can that be?" Macy asks.
"Oh, you'll see," Tabitha says, as a pink mist begins to waft from her vagina. Macy inhales the mist and coughs a bit. She begins to feel hot and horny.
"Wh-What's happening to me?" Macy asks, her body beginning to tremble and shake. Her skin begins to become gray and smooth. She starts to get bigger and fatter. Her belly swells up, making her look like she's pregnant. Her breasts expand, as does her butt and thighs. She gains a lot of weight quickly.
"M-M-Mrs. Elephant. Wh-What's happening to me?" she asks, feeling the effects of the mutation. She grows a long trunk from her face. Her ears and teeth also grow out, turning her into a full-blown elephant. She is much smaller than Tabitha, however.
"You've become one of us now," Tabitha says, as she gropes her breasts, and rubs her pussy. She moans as she cums, and sprays her pink mist all over Macy. The girl moans and squeals. She reaches down between her legs and starts to rub her pussy. She is so horny that she has to touch herself.
"Oh, my God. What's happening to me? Why am I so horny?" Macy moans.
"Because you're a mutated, horny slut now," Tabitha says, grabbing her ass.
"Wh-Why do you keep calling me a slut?" Macy asks.
"Because it's true. We all are," Tabitha says. "We can't help ourselves. Sex is the best thing ever. It's better than anything. And we just love it. There is no way around it."
"N-No. That's not true. I don't want to be a slut. I'm a nice girl," Macy says, continuing to play with herself.
"Oh, honey, no. You can't stop being a slut. You're already a horny bitch. Look at you. You can't even stop touching yourself. You have to have it. You'll need sex all the time. It will drive you crazy," Tabitha says. "So, just give in to it. It's okay."
"B-B-But I..." Macy continues to finger herself.
"You need to accept who you are, and what you're going to become. You're going to have to get fucked by guys, and have sex with them. That's the only way you can satisfy your urges," Tabitha says.