Rick and his sister hurried over to his mother's side, eager to help the obviously shaken woman. After a couple minutes of fussing, the woman eventually pushed her children away.
Rick's mom tried to reassure her children. "I'm fine kids. Really. Is Aunt Karen all right? Where's your father?"
Rick frowned as he looked for his dad. He found the man standing where he had been earlier, this time staring intently at his wife's crotch. As Rick looked closer, he could see dark wet spots all down the man's pants. The prominent bulge that Rick had noticed earlier was gone.
Rick and his sister helped his mother up and the three went over to check on his aunt. Similarly to his mom, Rick's aunt seemed to have mostly recovered from her recent orgasm.
"Girls, round up your father. We need to go get this looked at. Oh Jennifer! Are you alright? I can't believe what happened to us." Rick's aunt went to embrace her sister as his cousins went in search of their father. As the sisters embraced, Rick's aunt slightly rubbed against his mom's crotch. Rick watched as his mom's eyes bulged at the sensation sweeping over her new member. Within an instant the woman's new cock was rock hard and straining against her jeans. A grunt could be heard from Rick's mom as she immediately shot a hot load into her sister's midsection. The woman immediately pulled away from her sister, shaking as her straining genitals fired a second and third load through her jeans. "Karen" Rick's mom panted, "I'm so sorry..." The apology was cut short by a squirting noise from behind the two women.
Everyone turned around to see Rick's dad. The man moaned softly as a jet of liquid shot through the crotch of his pants. A second and third stream quickly followed.
"Dad, what's wrong?" Rick's sister worriedly asked.
The only response was a wet sucking sound from the man's crotch. Rick's dad had a pained expression as the noise continued. Eventually with a shudder and one last spray of fluid, the man seemed to relax. The dazed look on the Rick's dad's face did not fade. The display, however, had an effect on the two mature women.
Rick's mom's cock, just recently soft, had rocketed forward in her jeans. The woman looked down in amazement at the cock now seriously tenting out her jeans. Rick's aunt was experiencing her own boner, with the woman's pant leg struggling to hold her massive member. Rick's mom came to her senses first.
"Don't touch it Karen! I think it's changing us. We have to resist or things will only get worse."
Rick's aunt shook her head and forced a smile at her sister. "You're right sis, we're not going to let this beat us. Let's skip the hugs this time though."
Despite the circumstances, the women laughed. Rick forced himself to chuckle with the women. The mirth was cut short by a scream from the house.
Rick turned towards the open patio door as his cousins ran out as fast as they could. "Mom, it's dad. Something's wrong with him." Before Rick's aunt could question her daughters, she was cut short by her husband appearing at the door. Or at least what used to be her husband.
Rick's uncle appeared to have gone through several crazy variations of his own changes. The man's hair was wild and he had a crazy look in his eye. As Rick looked closer, he noticed that sizeable mounds had developed on the man's chest. The back of the man's pants had also rounded out, showing a curvy feminine ass. Rick then noticed the most shocking changes. A tail could be seen swaying between Rick's uncle's legs. As Rick looked closer, he could see other animalistic traits surrounding his uncle. Teeth were sharp and crooked, fur could be seen tufting out from exposed skin, and fingernails were long and pointed. It was clear Rick's uncle was turning into some sort of rat creature.
"Oh my god Will, what happened to you!" cried Rick's aunt.
"So horny Karen, need release. Help me please." Will mumbled as he stumbled towards Karen. The man began licking his lips as he got closer, clearly eyeing the bulge in his wife's trousers. A cry of warning came from Rick's mom, but it was too late. Rick's uncle, now within arm's reach of his wife, lunged towards her knocking her backward.
Rick's uncle landed on top of Karen and immediately began grinding his crotch against his wife's new member. "Oh my goodness!" Rick's aunt exclaimed as her eyes bulged and she was overcome by pleasure. Will's grinding motions quickly pushed the woman's new male hormones into overdrive. Instead of fighting her husband's advances, Rick's aunt eventually began thrusting her equipment urgently at her husband's crotch. An eruption of cum sprayed from the woman's pant leg as she thrust relentlessly, drenching her pants and her husband. An answering spray followed from Rick's uncle as a jet of liquid shot from his crotch, coating his wife. Before he could drive more changes, Rick's mom rushed in and pushed the man away from her sister. Rick ran to help his mom, watching as his rat-like uncle scuttled off.
"Mom are you ok?"
"I think I'm good. Oh my! Hnggg" was the only response Rick got from his mom before she fell onto her hands and knees.
Cock now fully tenting out its confines again, Rick's mom groaned as her own appendage erupted hot spunk over the patio. The woman's eyes rolled back as she fell to the ground and began humping madly. It was clear she was desperate to get herself off.
"Rick and his remaining family members watched in horror as their mothers pushed themselves closer together. Rick's mom leaned in and gave her sister a long kiss, stoking the hormones further. Before long, both women were humping desperately at each other's crotches. With one final cry, both women erupted a stream of cum from their appendages before collapsing onto the deck.
Silence fell as Rick and his family reeled from the nightmare that his birthday had become.