Tim and Marcy left after thanking Diana and the sisters for the free sample, promising to come back and buy some stuff once they've gotten used to their new body. Luckily the warehouse had a truck unloading bay that the couple could leave through, as they were far too large to use the normal door.
"I ssshould probably renovate the ssshop to accommodate larger cussstomers..." Diana muttered as she watched the couple stomp out. Imagining what would have happened had they transformed in the tight confines of her store.
Meanwhile, the body that Diana had manning the shop watched as a woman, somewhat nervously, entered the store. The customer avoided looking over at Diana as she browsed the shelves, looking over the various toys and accessories on display. As someone who had been running a sex shop for years, Diana had seen this type of customer plenty of times before: someone who had recently heard of the shop (maybe recommended by a friend, maybe through an online search) and wanted to buy a toy, but they were still embarrassed about expressing their sexuality in anything other than complete privacy. These people usually have a pretty good idea of what they want, but usually spend a bit of time wandering around so that they don't appear too eager, fearing that they would be judged by the cashier or other customers. Diana also understood that the best way to handle these types of customers was to simply let them do things at their own pace, as confronting them will most likely drive them away.
As Diana thought, after a few minutes of looking around, the woman made her way over to a display of “exotic” dildos before grabbing a box and creeping up to the register with it, her eyes still averted. The box she placed on the counter was one for a massive (for a regular human at least) twelve inch dildo. Diana wasn't very surprised by this, most people who bought dildos for the first time would often buy stuff like this, thinking that a bigger dildo would give more pleasure, and ultimately end up hurting themselves when they try to make them fit. Being a responsible shopkeeper, Diana went to dissuade the woman from starting with something so large:
“Are you sure you want to buy this? If you haven't worked up to it properly you could seriously injure yourself trying to insert something as large as this.”
Now that Diana had addressed her directly, the woman finally looked up at Diana, only to take a step back as she just now noticed the inhuman form behind the register.
“Oh! Sorry, I just didn't notice that you were a mutant when I walked in...” The woman quickly apologized, her eyes taking in Diana's form, only for her to suddenly turn her head away when she realized she had been staring.
“It's fine hon.” replied Diana, “...To be honest I've only been a mutant for less than an hour.”
“What do you mean? You're either born a mutant or not, sometimes the changes are unnoticeable until puberty but you can't become one.”
“Not until today!” exclaimed Diana, grabbing the jar of pills next to her and showing it to the woman, “I've received a batch of special aphrodisiacs from one of my suppliers that also randomly and permanently transforms your body. This first batch is just a sample, I've been giving them to customers that are interested to drum up demand before they go on sale tomorrow afternoon.”
The customer glanced back and forth between Diana's body and the jar of pills, taking a moment to decide whether or not she believed the crazy claim.
“You said you were giving them out for free?”
“Just for today, tomorrow they're going to be sold for a hefty premium.”
The customer took one last glance at Diana, taking in her sexual majesty, before she once again turned away held out her hand and muttered:
“Alright then... I'll take one.”
Diana eagerly grabbed a pill out of the jar and handed it to the woman, already beginning to develop a fetish for watching people transform in front of her.
“Alright then, follow me out back-” Before Diana could bring the customer out to the warehouse she had already swallowed the pill. Frustrated by her over-eagerness, all Diana could do was pray that she didn't destroy the store with her transformation.
The first noticeable change to the customer was when a horse tail slipped out above the waistband of her pants. This was followed by her thighs swelling up to the point her pants and underwear were torn to shreds, revealing that they were now covered by dark orange fur, which was spreading further down her legs.
“If you had waited until I finished talking, I would have mentioned that you should probably take off your clothes before swallowing the pill if you don't want them to get damaged.” Diana snarked.
Just before the fur reached her feet the customer kicked off her shoes, hoping to save them from sharing the same fate as her pants. Unfortunately she was unable to save her socks, which were torn as her feet were replaced with a pair of massive equine hooves. This sudden shift in posture caused her to lose balance and fall forwards, only to be caught by four of Diana's arms. While held up by the smirking lamia, a second pair of legs began to grow out of her hips. These legs surged forwards into a massive equine barrel, forcing the woman's original legs to walk backwards to prevent her from breaking the front counter. Once the woman's new legs had fully formed, Diana let go of her, the newly transformed centaur no longer needing the lamia's support to stand.
The woman's lower body was the size of a large shire stallion, her equine shoulders taller than she was originally, her human head well over ten feet off the ground. The centaur was suddenly overtaken by an alien sensation between her back legs, as an equine cock and balls formed. These newly formed genitalia grew at an incredible pace, her balls becoming large enough to almost touch the floor behind her while the shaft became an eight foot long and foot and a half thick cannon, the tip passing between her front legs. Suddenly overcome with the needs of her newly grown organs, the centaur bent her upper body down and began ineffectually rubbing the tip of her cock, whimpering with desire as her ball continued to churn with cum.
Diana watched as the woman in front of her failed to sate her new body's desires, unable to help directly since this body was unable to go much further before reaching it's thirty foot limit, as her other three bodies were still in the warehouse cleaning up after Tim and Marcy as well as talking with her guests. The lamia's gaze soon fell on the box the customer had originally wanted to buy, an idea forming in her head. Diana opened the box, unwrapping the foot-long dildo and leaning as far over the counter as she could. The lamia then thrust the sex toy into the gaping urethra of the centaurs hyper cock, eliciting a gasp of pleasure from the customer. A solution to her lust presented to her, the centaur grabbed the toy and began fucking her urethra with it, the stimulation causing gallons of precum to begin dribbling onto the floor.
It wasn't long before the centaur brought herself to orgasm, a burst of cum forcing the dildo out of her urethra before splattering against the front counter. More and more cum continued to cover the floor as the centaur's balls slowly deflated until they “only” reached down to her knees. By the time her orgasm had ended, the customer had managed to fill the entire store with three inches of cum, which was slowly draining from the open back door.
“Wow, that was amazing! If every orgasm with this body is even half as good as that one, I don't think I'll mind this being permanent!” the centaur said, panting as if she had just run a marathon.
Once she had fully recovered the customer, whose name was Blair according to her ID, purchased the dildo and put it in the offered opaque bag before she turned to exit the store. As she left, Diana got a good look at her swaying backside and her puffy equine doughnut. The centaur paused at the door for a moment, her tail flicking nervously as she only just now realized that she now has to walk back home with her massive horsecock exposed. Once Blair worked up the confidence to squeeze her horsey butt through the door, Diana looked down at the flooded floor and sighed.
“I'll alssso need to inssstall sssome drainsss it ssseems...” she muttered, getting one of her bodies back in the warehouse to add them to her quickly growing list of renovations.