... her cock was expanding, slowly, but surely. She frantically stroked it. But that was not all, it was also clearly travelling a bit upwards and a pouch started to form below her dick, soon enough filling up with her own new pair of testicles. Her cock stopped growing at a massive feet long, keeping the same girth as before. However, much to her dismay, the amount of the chemicals she swallowed just now would make sure to turn her into a proper freak.
Above her first penis, a second nub started forming and expanding. The new mass was clearly a second dick, and Katie made sure to quickly grab it as well, starting to stroke it as well. Right after it also reach a foot in size, her sack below started shaking and quivering, as her two testicles were joined by another two descending down. They hung just behind the original pair and were clearly seeable from the front.
Katie only stopped stroking her twin cocks in order to throw off her shirt and massage her burning up chest. Her for now average bust started swelling as well, much to her confusion. But soon enough, this change started making sense.
In combation with her growing chest, her nipples also swelled, much more in width than in length until they cleary formed another two penis tips. Her breasts swole up to a massive F cup, but they somehow still kept their mostly round and full shape.
Soon after, the two dicknipples started slithering out of their holes and turned out to be 6 inches of very sensitive pink flesh.
Tiff just stared in shock and disbelief as Katie mutated. There was nothing she could do.
However, it wasn't completely over yet.
Katie looked at her double dicks and saw that each respective cock started forming a pronounced medial ring, in contrast to her otherwise human dicks. Also, her dicknipples started forming feline barbs, which completely submerged her mind in pleasure with every stroke.
As her changes finally finished, Katie came out of all four of her cocks, and she slumped against the wall in a state of pure bliss. Her dicknipples slithered back into her boobs, now receeding completely, leaving her with what seemed to be regular old inverted nipples. However, her twin cocks stayed at a semi erect state, most likely due to the chemical still affecting them.
"Katie I... I will find something to help you!"
Katie seemed to be too distracted by her new freakish anatomy to either notice her friend frantically searching the shelves or to really realize what had become of her. But then...