Clarissa laughed with her friends, each toting a solo cup of beer. Her sorority's party was going great! Lizzie walked out of the kitchen holding a hefty bowl of violet liquid. "Hey girls, punch is ready!" Clarissa loved punch. In fact, she was the first to ladle it into a cup, leaving her beer on the table before returning to the drunken cheering, chatting and gossiping of the party. The music blasted over the sounds of chitchat and white noise from the TV. But what nobody knew was that a virus has entered the punch somehow, and was working its way into the bloodstreams of the partygoers.
In the middle of the party, Monica collapsed onto the ground, panting heavily. Her drunken sisters ignored it, assuming a blackout from the copious amounts of alcohol. Soon, however, they would be proven wrong. Monica writhed as if having a seizure, her screams drowned out by the music. Being the first infected, she would experience the most pain. Fur began to poke out of her skin, and quickly continued to grow as it covered her body, and her body cracked and shifted around to form the shape of an animal. Her face pushed out and her ears pulled up and became triangular as her nose wrinkled and changed, and a long, fluffy tail ripped from the back of her body.
By now, the group around her had noticed, and stepped back. Others in the house partied on, unaware. On the ground lay a female snow leopard.
Then her body quickly changed to a humanoid shape, her breasts regrowing and her body taking on muscular human proportions, then mutating back to a snow leopard. Eventually, her form stopped in the normal snow leopard form. Then, her body swelled outward, gaining bulk. Her change was complete. The girls around Monica stared, shocked. Then, Shari looked down at her hand and yelped as she noticed fur beginning to grow.
Across the party, people began changing into animals. It was unclear why Monica's change was painful while theirs were mostly painless, but soon only animals remained. Soon, the animals realized the pain in their pussies. They were in heat.
Soon, they all jumped each other. A fox licked furiously at a husky's cunt, while a wolf pleasured her, and trains of cunnilingus began around the house as the former sorority began an animal orgy. Then, their changes matured, and cocks grew out above their animal pussies.
They then left the house and began prowling the night streets. They had been unable to stop the heat, and needed to be satisfied. When they found a man, they jumped him, rode him and drained him dry, then fucked his ass until they came, after which he transformed.
Males were less muscular, and had seemingly small cocks, but they were prehensile and could easily stretch to reach a female's pussy. Soon, these males searched for humans to transform.