Lara was alone in her apartment. She was already resting after a day's work when she received the announcement that the mutation outbreak was taking place. She watched TV, following the news on the subject, while she heard some indistinguishable sounds coming from the apartment across from hers, across the hall. She didn't know what it was and, given what was going on, she thought it best not to be curious.
At one point someone knocked on her door and before she answered she screamed from outside "Here and the health team, we need you to let us in so we can check your condition." Lara opened the door and found a man wearing protective clothing, who upon seeing that she had not been infected said "We were called to attend someone infected, but the situation in this building is worse than we imagined. We call for reinforcements but as they arrive you all uninfected must evacuate the building. I want you to go down and wait for us outside."
Lara, realizing the gravity of the situation and seeing the cum runnig under the door of Yara, who was the neighbor in front of her, she wondered where the problem was, so she just grabbed her purse and left.
She went down a floor, careful not to slip on the smooth floor from the cum, and saw an apartment door open. She peeked inside and saw that the old woman's son who lived there was in front of the bedroom door trying to convince his mother that he wouldn't go without her, meanwhile Janet insisted that he not worry about her and that she would see him as soon as it was safe.
Unbeknownst to them, Dara was getting her ass fucked by her three-headed dog friends and she ended up cum again, absurdly increasing the amount of cum in the apartment, which this time was too much for the front door, which broke into several pieces. the infected white material formed a current that ran down the corridors and stairs.
Lara had stopped spying on the neighbor's apartment and was heading to the next set of stairs when she heard the noise coming from above. Looking back she saw a big wave of cum coming in and the doctor in protective gear being carried by the current. She tried to get away, but the current was too fast for her to escape and she was dragged too. All her efforts to hold back or avoid swallowing the cum were in vain, she only stopped on the first floor, where the material found more space and dispersed, lessening the force that carried her.
Lara got up, covered from head to toe with cum and without the slightest doubt that she had been infected, she was accompanied by the doctor who had also been dragged to a nearby wasteland, which had metal plates that prevented that she would be seen during her transformation, especially with the possibility that her clothes would become useless later, and prevent her from trying to go off infecting someone else before more help arrived.
Knowing she couldn't keep them in that state, Lara took off her clothes and just hoped her mutation wasn't too inconvenient. Her changes didn't take long to start, which was with her buttocks melding and stretching behind her, lumps forming and stretching, what she thought would become a new pair of legs, but instead became arms. Controlling the new pair of arms, she touched the still-forming part of her, and could feel some lumps which, straining to see what they were, she realized were four breasts that were growing in the new stretch of her body. Soon this new extension was a copy of her top half and it that was facing backwards, only with four breasts and nothing between its shoulders, which didn't last long as a 15 inch cock with balls the size of melons grew where the head should be. The changes then went to the lower half of her, which consisted of her legs and vagina reversing and facing backwards as well. The change now continued into her original top half, which started with her breasts merging and a long thing, which she soon recognized was a new cock as big as the one between the shoulders of her back torso, grew turned face down of her breasts turned into ballsack. Then her shoulders stretched and forced in front of her, who looked over and saw a hole open between them, allowing her to realize that her shoulders had turned into an ass. The finishing touch came with her original arms turning into legs and she being forced down so that her four feet were on the ground, and her neck stretching.
With her transformation completed, Lara can better ascertain the extent of her mutation. She had become a humantaur with four F-cup breasts, she had a vagina between her front legs and two 15 inch cocks, one between her back legs and one between her shoulders. Her head was at the end of a three foot long neck now, which was fully flexible and she could move freely, attached just above her ass like a tail. With the transformation completed she screamed, hoping the doctor was still around, to report back on what had happened.