It needs to be noted that this story contains futanari so readers aren't surprised. I picked the incest/taboo category because I could only choose one.
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Ashley's eighteenth birthday came and went with great fanfare. Her parents and older sister took her to her favorite restaurant where the waitstaff sang Happy Birthday and the other patrons clapped for her.
After arriving back home Ashley was in her room changing into a comfortable pair of sweatpants when her sister knocked and entered.
"Ready for this weekend Ash?" inquired her older sister Kate.
The female members of the family had a longstanding tradition where when a girl turned eighteen, they would meet at the family cabin for a "girls only" weekend.
"I sure am," Ashley responded, "why did I have to wait until I was eighteen to go? Do you guys get drunk on wine or something? Hire a male stripper?"
Kate laughed. "No, nothing like that. You'll find out. It's a blast!"
Two days later the three Anderson women were in Ashley's mom's SUV heading up to the family cabin located at a pristine lake in the foothills. Ashley's grandmother, aunt, and cousin were coming up in a different car to meet them there.
Arriving at the cabin, Ashley and Kate helped their mother Leslie carry in the supplies that would last them the weekend. Ashley's other relatives arrived a half-hour later bringing in some additional supplies.
Being early October, it was too early for the really cold weather but there was a little chill in the cabin air. Ashley's Aunt Christy used some of the stacked firewood to start a cozy fire in the living room fireplace. While this was going on Leslie and her mother Janet were in the small kitchen whipping up a simple dinner.
After eating while talking and laughing, Janet disappeared into the kitchen and soon brought out a tray of six tall glasses filled with a reddish liquid.
"Alright!" squealed Ashley's cousin Jessica, "time for grandma's famous fruit punch!"
Ashley had drunk plenty of her grandma's fruit punch over the years. She didn't understand why her nineteen-year-old cousin was so enthusiastic. Was there booze in it? Ashley grew excited at the thought that her straitlaced mother was going to allow her to consume alcohol in her presence. It made her feel grown up.
"Grandma is there alcohol in it? Is that why no one under eighteen can participate in these weekends? Ashley was sure this was the answer.
Oh, no sweetheart," answered her grandmother, "what's in this is much better than alcohol."
At that the rest of her family giggled. Ashley was confused and decided that it was just the energy of them being together with no family men traipsing underfoot.
"Alright everyone, grab a glass and chug it."
Six hands grasped six glasses and fruit punch was consumed.
The punch didn't taste like her grandma's usual fruit punch Ashley decided. It wasn't bad per se, just different.
"Now close your eyes baby so you can receive your present from all of us," Mom coaxed. Ashley obediently closed her eyes. Around her she heard her relatives' giggles and the rustle of clothing. Ashley couldn't figure out the rustling noises. The delay was killing her. Finally, her mom said, "open your eyes baby and welcome to the birthday tradition."
Ashley eagerly opened her eyes and was shocked by what she saw. Everyone but her was naked.
"What the hell?"
"Well sis you can't have your birthday without being in your birthday suit," exclaimed Kate. This caused her Aunt Christy and cousin Jessica to burst into laughter. Ashley looked at her mom for support.
"It's okay Ashley, I promise," Ashley's mom said soothingly, "go ahead and take your clothes off."
"Go ahead Ash you'll be happy you did," added Grandma Janet.
Ashley was stunned. Were her family a bunch of nudists? It would be weird to be naked around them. Of course, being the only one with clothes on was weird too. Finally coming to a decision, Ashley swiftly divested herself of her t-shirt, shorts, and underclothes. She modestly covered her pussy and tits.
"Just in time honey," said Ashley's grandma.
Ashley was about to respond when a sudden pressure caught her by surprise. The pressure was centered at the top of her private area. She lifted her hand away to look down and was amazed at what happened next. Ashley's clitoris began to grow out until it became a fully formed penis. A fully formed large penis. It was much bigger than her boyfriends.
"Fuck yeah," came a voice to her right. Ashley looked at her sister Kate who was also growing a large penis. One by one her female relatives all grew penises. Not penises, she thought. Cocks. Big, thick cocks.
"Mom, how is this possible?"
"A wonderful secret passed down from female family member to female family member. At eighteen all female members are let in on the family tradition."
"Mom it is not possible for women to just grow dicks. It is scientifically impossible."
Her grandmother spoke up. "Some things in nature cannot be explained by science. Besides, don't you believe you own eyes?"
Ashley reached out and touched her penis. No doubt it was real. "So, we all came up here so we could all grow dicks?"
"Well that is the first step," her grandmother replied. She quickly knelt before her granddaughter. Before Ashley could stop her, Grandma Janet engulfed Ashley's dick into her mouth.
"Grandma what are you -- oh wow."
"Enjoy baby," said Ashley's mom, "your grandma can suck a mean dick."
The other relatives crowded around to get a good look at Ashley's blowjob. Looking to her right Ashley could see that her Aunt and cousin were slowly stroking each other's dicks. Meanwhile her mother was squeezing her older sister's ass while her sister repaid the favor by stroking her mother's nipples.
Ashley had never felt anything so good in all her life. No wonder guys were always trying to get blowjobs. After about two minutes her grandma stopped, and Ashley's mother took her place. Her mom looked up at her with pure love in her eyes as she sucked and licked. After her mother it was her sister, then her aunt, and finally her cute cousin. Each one brought Ashley unbelievable pleasure. As her cousin was blowing her, Ashley felt an urgency in her dick. Instinctively she knew she was about to come.