Just as Diana finished cleaning the part of the shop closest to the entrance and the front counter, another customer wandered into the store. Diana observed that the customer was a beautiful woman in her late twenties with a generous bust and silky black hair, but dressed in a way to try not to attract attention. She glanced around, making a complicated expression when she saw the goop in the corner of the room that hadn't been cleaned yet, but she quickly moved on towards the counter.
"Welcome, how may I help you?" Diana asked with her body behind the counter.
The customer glanced along the length of Diana's body that trailed toward the back of the store before returning the gaze to her face. "Hi, sorry for getting distracted, it's not every day I get to see a lamia-type mutant," the woman replied.
"Oh, don't worry, I don't mind if you look as much as you like. I'm Diana, by the way, I run the store. Might I have the pleasure of knowing your name?"
"Oh, right, I'm Lena. Nice to meet you."
"So, what can I help you find?" Diana asked.
Lena took a deep breath before replying, "well, I was wondering if you have anything that can help a single woman..." Here she hesitated, "...relieve her urges, you might say." Lena was blushing profusely. "I-... I don't have time to get in a relationship, but my old toys aren't doing the trick anymore."
Diana smiled gently, as this wasn't the first customer of this type that she received. "Well," the shopkeeper replied, "I can think of a few things that I would normally recommend. However, we just got something special in stock that you might be interested in. Have you ever wanted to be a mutant?"
Lena was a bit surprised by the question. "Well, I can't say I've never had a daydream or two, but seeing as I wasn't born one..." Lena trailed off.
"You might be in luck," Diana replied. "We got some new aphrodisiacs in stock that can permanently turn someone into a mutant until the next time they take one, and it works more than once if you keep taking them. I'm trying to drum up interest in them by passing out free samples today, would you care to try it?"
It seemed too good to be true for Lena, but she wasn't letting on how much she longed to have more, to have extra in her solo-play. After a brief internal struggle, she gave in. "Sure, I came here to make things more interesting, so heck, it doesn't get more interesting than this. Anything I need to know ahead of time?"
Remembering her last customer, Diana mentioned that Lena should remove her clothes first to remove the risk of destroying them. "Oh, and as long as you aren't uncomfortable with it, would you mind taking the pill here? I'd like to keep spreading the word by having customers advertise the efficacy of the aphrodisiac, and it's a nice bonus seeing how it affects different people." Lena hesitated a bit, but seeing as she was getting the pill for free, she agreed to the terms. "Alright, it's a deal."
After being handed the pill, Lena stepped into the back of the store where it was more private and there was more spave, then stripped her clothes and popped the pill in her mouth. It didn't take long for the changes to start as she grew about a foot taller, and two new pairs each of arms and breasts grew beneath her original pair. Next, her vagina split into three copies, and soon three long, nine-inch dicks grew above them. Next, her vision widened as her head began stretching sideways until it split into two copies of her original head. For a moment the changes seemed to stop as she began adjusting to having two heads before she noticed her feet felt weird. Looking down, she saw they were turning a transparent red color and began looking like gel. Soon, the color and material change spread upwards through her whole body until it was clear she had become a sexy , two-headed red slimegirl with extras.
"Wow"
"Wow"
Lena exclaimed in stereo. Concentrating on one head, she added, "not what I expected..."
"...but I like the possibilities," she finished with the other head. Experimentally, she tried focusing on her breasts, and watched as she shifted them to have mouths instead of nipples. "I *really* like the possibilities," she said with one of her new mouths. Seemingly oblivious to the two Diana bodies watching her with wide grins on their faces, Lena turned her heads to face each other and tried kissing herself. Suddenly, she broke the kiss as she felt a shift in her body. It felt as if she was simultaneously gaining mass while being split apart. Sure enough, it took mere moments for a crease to appear down the center of her gelatinous body, quickly widening as the two halves pulled apart. Once they fully separated, both regrew the missing parts, leaving two doubled-headed slimegirls in the middle of the room.
Amazed by what just happened, both Lenas raised a right hand to touch the other body. "Woah..."
"I'm in two places at once"
"How am I controlling two separate bodies like this?"
Lena alternated which heads said each of these lines as she examined her bifurcated bodies.
Trying to hide her arousal, Diana spoke up. "Wow, looks like you were gifted with an especially great transformation. I take it you liked the pill?"
"Hell yeah!" All four of Lena's heads exclaimed. "I think I may need to buy some double-sided dildos now, haha."
"Be my guest," Diana offered, "I think you'll be quite impressed with the variety of choices we have for sale. By the way, I heard some slimegirl mutants can imitate others or combine with other slimes for more shiftable mass, do you think you have those capabilities?"
Lena shrugged, "I dunno, let me try it." Concentrating, Lena's body slowly regained a skin tone as her hair-gel turned back into her silky raven hair. She looked just as she did after transforming but before becoming a slime, with the addition of lipples. "Nice, looks like it!" she exclaimed before turning back into slime. Just then another wave of mitosis hit, and there were soon four Lenas in the room.
"I'm gonna take a look at what toys you have here, I'll be right back," Lena stated. Diana was incredibly turned on by what she just witnessed, but held it in since she had a customer in the store. About ten minutes later, a crowd of sixteen Lenas came up to the front of the store, carrying about a dozen different products. "Sorry, got a bit carried away, seeing as I have a lot more... options now." As she was in the middle of playing for the stuff, Lena once again underwent mitosis, beginning to feel cramped with 32 bodies in the room. Almost instinctually, she began pressing pairs of her bodies together, absorbing them into each other and somewhat compressing their mass until there were just eight of her left. Redistributing the mass, each of them were now 6'4" with three heads, ten arms, eight large breasts with lipples, and four foot-long cocks. Thanking Diana again for everything, they left the store and headed home.