Alex emerged from the pool as Alice went over to talk to Kate. Before long, Melanie's family had surrounded Alice.
As Alice began to recount the recent changes to her parents, she was interrupted by an exclamation from Melanie.
"Oh Alex! That's gross bro!"
Everyone looked towards Alex to see the source of the commotion. Alex's swim trunks were strained to the limit as he was currently experiencing one of the biggest erections of his life.
"Dear, uh do you need to use the bathroom" Kate asked.
"No mom, I don't know what's going on. All of a sudden I feel kind of weird."
"Well try to calm down a bit dear. We do have company."
Everyone tried to return their attention to the conversation, but were only interrupted a moment later by Alex again.
"Oh man!" Alex exclaimed.
Melanie and Kate gasped as spunk suddenly flew from the bulge in their brother and son's equipment.
"Gross bro, that's so weird. What's wrong with you?"
Alex remained quiet, still reeling from his previous explosive orgasm. His mother similarly was quiet. Kate was staring intently at a drop of cum that had splattered on her pants. She was brought back by the present by another exclamation from Melanie.
"Alex what's happening to your chest?"
Sure enough, Alex's chest began to bulge out. Buds began forming in, growing steadily in size. Alex's nipples also grew erect as he reached to feel his changing body. Before long, Alex was cupping two large breasts hanging from his chest.
Alice could only watch in shock as she saw her best friend's family fall victim to the same curse that had befallen her parents.
A loud moan from Melanie's mother turned everyone's attention away from Alice. Aware of the new attention, Kate, with flushed face, tried to regain some semblance of composure. "I think we should go to the hospital. These changes to Alex are more than just the standard bug. Let's go right now!"
As Kate got up from her chair, however, she showed off her own changes. A distinct bulge was growing in Kate's pants. While not large yet, it would not be long before her tight pants began to give her some level of discomfort. Kate looked down in shock at the bulge, not fully grasping what she was seeing.
Alex stole everyone's attention with another groan. A second stream of cum spurted from his still erect penis. He wasn't done though. Alex began working up a slight thrusting motion and began grinding into his tight swimsuit fabric. Before long, he had cum several times onto the surrounding poolside.
Melanie and Alice for their parts could only cover their mouths in shock.
Melanie's mother grew more flushed as she watched her son expel his seed. This lust stoked her own changes. The mass growing in her tight pants began surging forward. Before long, a fully erect penis tented her pants. She was not done herself though, Kate's face turned red as she began pushing as if giving birth. With a loud pop, two testicles dropped into her pants alongside new penis. A goofy expression donned her face as floods of testosterone began flowing through her body and her erection swelled further. Kate was able to eventually compose herself though. She looked around in shock at her children and neighbor before grimacing.
"Oh my, something's happening" Kate moaned.
Everyone could only watch as Kate joined her son in spurting fresh seed all over the poolside. Kate began thrusting at the air as her changes progressed further. Her testicles continued to produce more cum for her new member to ejaculate through her pants. The crotch of Kate's pants was quickly drenched as she ejaculated again and again. Alice and Melanie could only watch as Kate and Alex humped the air in a frenzy and expelled more seed.
A new surprise awaited everyone, however, when Alex's new breasts began squirting milk. As the milk continued to squirt, the bulge in Alex's trunks began diminishing in size. Alice and Melanie's optimism that the changes may be reverting, however, was ended when a long tail burst from the back of Alex's trunks. It was a cow tail.
Meanwhile, as Alex's bulge decreased, his mother's increased. The swelling in her pants was was now causing her some major discomfort as she continued to thrust and ejaculate everywhere. With one large thrust, her swelling penis punched through her zipper and ejaculated all over Alex. Some clarity returned to Kate as she looked down in horror at the large bull penis and testicles hanging from her crotch. Her relief was only temporary as her next changes took hold.
Similarly to Alex, a long cow tail punched through the back of Kate's pants. Her breasts also began squirting milk, but unlike Alex's began to deflate in size. Before long, Kate was left with a flat chest in her milk soaked button shirt, her bra hanging awkwardly. The loss of her breasts allowed the new testosterone in her bull testicles to take full force.
Melanie and Alice watched with hands over mouths, as Kate walked behind Alex and grabbed his behind. Alex, whose new breasts were starting to form into an udder, began bending over enticingly for his mother. For her part, Kate was able to hold herself back for a short moment before giving into her new urges.
A low moo escaped Kate's mouth as it began forming into a cow muzzle and horns grew on top of her head. She reached down and pulled Alex's swim trunks off, exposing his new cow pussy. Alex's mother wasted no time in straddling her now female son, thrusting her equipment hard into his new pussy.
Pops and cracks were heard from both mother and son as Kate and Alex's bodies changed to reflect the livestock they were becoming. Fur began creeping over their bodies. Before long, other than the belted pants enveloping Kate's lower half and shirt covering her chest, it was not clear that the two livestock had been formerly a mother and son.
With one last thrust and moo, Kate ejaculated into her son. A goofy expression crossed her face as her remaining clothes burst from her body as it grew to bull proportions, fully exposing her still erect penis and testicles. Alex meanwhile walked away, seed dripping from his new cow vagina, and began feeding on grass as he came down from his post orgasmic state.
"Mom! Alex!" Melanie cried towards her new bull mother and cow brother. "You're still in there right? Please say something!"
"It's spreading" Alice could only whisper.