Tiff kept toying with Katie until she came. Tiff didn't want to let Katie as an inanimate. She found a syringe, removed it's needle and used it to inject the human vial contents through Katies urethra.
Soon Katie began to grow, but something was strange. As the cock-Katie became a humansized penis a complete body grew under the balls. Katie now was a normal woman under her chest, but a huge penis above it.
"Katie, are you OK?" asked Tiff trying to get any answer.
With this, the cock began to grow erect, when the cock's foreskin retracted it revealed Katie's head instead of a normal cock tip.
"What is the problem with me? I am a cock woman now" Katie said seeing her body.
"It seems that instead of canceling the effect of the previous vial, the human vila effect got mixed with it" sugested Tiff looking above.
Katie was now a 8 feet tall woman with a 4 feet cock as neck and balls where her breasts used to be.
Tiff couldn't resist the temptation and bugan to rub Katie's shaft neck.
Katie tried to complain but felt a pressure on her neck a notice thar she was going to cum. She tried to hold it, but failed completelly. As she came a lot of cum cafe aou through her mouth.
After the orgasm, Katie's neck returned to the normal size, which, in her new body, seems to happen only when she doesn't have an erection.