(Author's note: I wanted more dialogue, but I'm unwell so this will have to do.)
The man behind the counter watched as a woman came in. She looked to be in her late twenties with brown hair. He also noted she seemed to be a little tipsy. Given the power of some of his wares, he was a little cautious to sell her anything. However when she came over with what she thought was a smartphone he grinned. The M.T.D. otherwise known as the monster transformation device was perfect for her. It had a built-in safeguard to prevent loss of life or damage to people. It was purely an instrument of cosmic fun. Sure its more advanced settings could theoretically be dangerous but he doubted she could find them when she was drunk. Just in case after she left the man went to the employee's only area and opened what looked like a circuit breaker box. he flipped the giant switch and the whole store went to the next dimension. The woman even if she wasn't drunk would never remember where she got the device.
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Brooke stumbled back to her apartment. She clutched a bottle in one hand and tried to put her keys in with the other. After several failed attempts she opened the door and turned on the lights. She was surprised to see four of her closest friends sitting in the living room. First, there was her roommate and BFF Addison. She had moved in with her after her husband dumped her for his yoga instructor. Then there was Hannah who had dirty blond hair. Next was Grace, a redhead with freckles and glasses. Finally, there was Ivy. She had short black hair.
"what's all this?" Brooke said. Her speech was slurred as she closed the door. "Brooke please sit down," Hannah said. Even in her drunken state, she realized this was an intervention. "oh no... you're not..." she said before almost falling. Addison rushed over and caught her. "please we need to talk," she said. Now sitting the group began to talk. Ivy mentioned how drinking because she got dumped wasn't helping. Grace tried to say there were more fish in the sea only for Grace to lash out. Hannah then tried to pry the bottle from Brooke's hand. This resulted in the contents flying onto Grace.
Brooke then broke down crying. She admitted she had a problem and asked for help. Brooke then got out what she thought was her phone. The others noted it wasn't her phone but Brooke pressed some buttons immediately afterward. Due to her fingers sliding over the controls, several effects were selected. The effects hit Brooke like a freight train. Suddenly she was sober and looked down at what she had. M.T.D. was printed on its back and the screen just said changes in progress. She tried to get her friend's help but found everything was frozen except her.
Looking back down at the device she saw the hand change. The skin darkened to a mud-brown texture as a water-resistant oil was secreted from her pores. Her pinkie was sucked into her hand as the rest of her fingers grew filling up the space. Her nails sharpened into dark brown claws as a pinkish webbing grew between each digit. It then ran under her hoodie. She was unable to see beneath but saw her muscles grow slightly. Once it got to her torso she felt something happen to her chest. Her breasts began to shrink rapidly as her shoulders widened. From her chest, strong pecs filled the void.
As the changes spread across her torso her arm and neck also changed. Soon her left arm matched its partner as her neck elongated somewhat. The skin on her front turned tan as light brown stripes ran up the back of her neck. A bulge grew underneath her chin as her hair changed. The brown locks fell off except for four parts. The clumps curved and merged into four brown spikes down her neck with a membrane between them. On either side of her neck, three lines dug through her flesh without a drop of blood. These gills would allow her to breathe underwater. Her ear migrated to the top of her head then became long and pointed like a canine. The insides turned the same pinkish color. Her face then pushed out into a long muzzle like a reptile, close to an alligator or crocodile. Her teeth became fangs, and several poked down from her upper lip. Her nose had sunk in as his tongue lengthened. Suddenly she could see even better as her eyes changed. The whites became yellow as she lost her irises. Above the original pair, another set of eyes grew. All four now glowed slightly. Unless in shadow or pitch blackness, it would be unnoticeable. She then becomes uncomfortable as something presses against her jeans. It became so unbearable she had to take them off. Her panties snapped off as a long serpent tail grew. It was dark brown with light brown stripes. All of her skin then gained a color-changing ability. When in the light the stripes would be light brown but in the dark they would be grey. Her thighs then bulged with muscle. The skin follows the pattern as before.
The rest of her legs followed suit giving Brooke a bottom-heavy look. Her feet then shifted as they broke through the shoes. She saw they were now larger copies of her hands, they had to be at least three times the size of her original and had all five digits. She then moaned as her reproductive organs shifted. Her pussy lips shrunk into a slit from which an inhuman penis emerged. It had to be over a foot long. It was mostly dark brown with a gigantic knot keeping it on the outside until he got off. It had pinkish stripes on its top and a long one on either side of the knot. On its bottom, it secreted a slimy oil from its squishy pink skin. Its head looked like a deformed pink strawberry. Brooke then was hit with a flood of new memories. He was now an eighteen-year-old monster fresh out of high school. His name was Brice and he moved in with Addison because she was okay with his appearance.
Looking back at the device he saw it was altering reality. Brice then saw his pants and broken panties disappear along with his purse. He now felt a wallet and phone in his hoodie. Time resumed as he saw his friends begin to move. However, there was no alcohol and no intervention.
He was a little confused why everyone was giving him a stare until he remembered how his dick affected people. It made them horny and craving a taste of his cum. unfortunately another side effect was his cum could mutate anything who came into contact with it. Quickly looking at the device it had a box for transformation and under it said random and was located in his semen. Before he could change it he was tackled by his friends. He found himself moaning as his BFF sucked his dick. he tried to hold back the cum but failed. he felt his thighs clench as the five testicles in each of them created more cum than Addison could handle. As a result, his dick went wild spraying everything for a solid minute before his knot relaxed and it returned. As Brice calmed down he stared at his friends. Each of them was mutating. The clothing on each of them was taken off, ripped, or torn apart as their changes progressed. cum began to spurt out of Addison's nipples. Hannah's body hair grew thicker by the second. Grace's muscles tore through her clothes. Ivy's clothes seemed to melt and reform, even though Brice had been a woman before he had this deep urge to enjoy what he had witnessed.