Arriving at the lab, Martha and Gloria went straight into the testing room they were already familiar with. In the middle of the corridor leading to the room they found Raven and discovered that he also had a side effect. His breasts were huge K-cup now and the nipples were so big they could be clearly seen even through the bra he was wearing. Aside from the size of the breasts, the most shocking thing was that there was a pair of horns on his head and he had a cow tail swinging behind him. He explained that the breast enlargement lotion he had been testing had cow enzymes, but it was designed for the animal's characteristics not to show up in humans, but continued use had grown his horns and tail. Raven noticed the size of Martha's dick, which was 18 inches flaccid, and she told him about what happened to her. After catching up on the conversation, they headed to their destinations.
Arriving in the known room, Martha and Gloria took off their clothes, but before they continued, Dr. Alex did another physical exam to compare the before and after the session, and also took more blood samples from them. Even before starting the tests, the Dr informed that because they had already identified the possible effects of excessive use of the penis expansion lotion, this would be Gloria's last application, which would confirm the safe limit for use. And to Martha she said that, since she was going to test a drug that would serve to reverse the effects of the lotion, she expected that it would be done exactly the opposite of applying it and the woman should not stimulate her cock at all.
They positioned themselves and Gloria applied the lotion to her cock, not before shoving a vibrating dildo she had carried inside her pussy. Dr Alex went to Martha with a syringe containing a green liquid, which she injected directly into the subject's dick before returning to her own seat to take note of the development.
Gloria's cock grew from the stimulation until it reached 10 inches, her balls reaching the size of softballs, which is when she came.
On Martha the antidote was working. She followed the instructions and never touched her cock, even though it got totally hard. Her dick got smaller and smaller until it was only 10 inches, her sack also decreased as her balls got smaller and decreased in quantity, which at the moment was only two. But something went wrong as the shrinkage stopped and immediately the member grew back, past 15... 20.. 25.. right past 30.. 35.. and stopping at an exorbitant 40 inches long and the thickness of a boxing punching bag. Her sack also regressed and exploded in size until it was filled with eight basketball-sized testicles.
After all this growth, even without any stimulation, Martha came. Her giant cock shot huge jets of cum that flew everywhere, hitting the walls, ceiling, Gloria, Dr Alex and everything in the room. When Martha's orgasm finally subsided, apart from the dirt on everything there was an inch-deep layer of fresh cum covering the room's floor.
Gloria and Dr. Alex cleaned themselves and, while waiting for Martha's dick to become flaccid so that she could get dressed and be released, more materials were collected to do tests and compare the before and after application of the experimental antidote on her. Then there was another problem, as Martha's giant cock did not soften a bit and, after almost two hours of waiting without doing anything, she came again in another explosive orgasm, further increasing the dirt and layer of cum on the floor.
This led Dr Alex to believe that Martha had acquired a permanent erection, and that her cum production was so great that she had spontaneous orgasms. Because of that, she was forced not to let Martha go, she would have to be admitted to the laboratory where she would be treated as quickly as possible.