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It was Nikki’s birthday and she was super excited. Her friends always planned her wild and extravagant parties that usually ended with a sexy surprise. This wasn’t typical of most friend groups she knew, but Nikki’s friends were all poly, and so was she. Her friends had been hyping up this year's party like it would be one of the best yet. Nikki was thrilled as she made her way over to where the party was to be held.

Her excitement waned a bit as she pulled up to the address. Seemed like a regular old house to her. Not much of a party destination in her mind, but oh well. Maybe they were just meeting here. Nikki stepped inside and was instantly greeted by all of her friends. They handed her a drink and started catching up. It had been a while since she had seen them.

“So, where are we going tonight?” Nikki eventually asked.

“This is it,” said one of her friends. “We’re staying right here.”

“Well, I don’t mean to sound indignant, but this isn't really what you hyped it up to be.”

“How about you open your gift and see if that changes your mind.”

“Okay!” Nikki shouted excitedly.

One of her friends went into the other room and came back holding a small box wrapped in pink paper. Thoughts about what could be inside raced through her mind. Maybe they were plane tickets to a tropical resort, or concert tickets for a concert next month, or maybe some extravagant jewelry that cost the whole budget for the party. Nikki couldn't wait anymore, and she ripped through the wrapping paper to reveal a small black box. Carefully, she removed the lid and but was completely puzzled at what she saw. It appeared to be a little circle with an emoji of a dick on it with the letters XXXL written underneath.

“What is it?” Nikki asked, puzzled.

“It’s a sticker,” replied one of her friends, holding in a chuckle.

“A sticker? Okay, now I’m really confused. What would I want with a weird sticker like this?”

“Put it on and find out,” replied another friend. “You’ll have to get naked first though, and stick to your crotch.”

At this point, Nikki assumed she was being pranked, but whatever, she would go with it for now. Nikki stripped all of her clothes off and tossed them in a pile on the floor. This wouldn't be the first time they had all seen her naked. Next, she removed the little adhesive backing on the sticker. Carefully, she patted it down on her crotch so that it nearly covered her pussy completely.

“There, you guys happy now?” Nikki asked a bit indignantly.

Before anyone could answer though, Nikki began to feel something bizarre. The sticker felt like it was melting onto her. She looked down to see that it kind of was. The plastic face of the sticker was changing to resemble the color of her skin while also… growing? She watched in awe as the sticker grew outwards further and further, now fully matching her own skintone. The edges of the sticker no longer existed, but instead melded perfectly into her own skin. Two large balls began to form under the long shaft of the sticker as it approached its final length. Then, it began to grow in girth, getting wider and wider around. It began to get heavy, and Nikki grabbed it with both hands to support its weight.

She gasped. She could feel the sticker as if it were her own skin, and as she held it, the sticker even began to feel like skin. The balls were now the size of her head, and the tip of the sticker had formed to be the head of a penis. Nikki was now holding a cock, her cock, and it was MASSIVE. Her mouth hung open in surprise and excitement as she rested it on the edge of the counter. Nikki had always wanted to have a dick, but she hadn’t known anything like this existed.

“Oh my god, you guys, this is crazy! How did you know I would want this?” asked Nikki.

“You told me last year when you were drunk,” said one of her friends. “I did some research and found this product. The best part is that it's fully functional and lasts an entire year!”

“Can we try it out?” Nikki asked. “I think I’ll need everyone's help to stroke this monster off.”

“We thought you’d never ask,” replied everyone in unison.

And so began Nikki’s year-long adventure as an overly endowed futa. She spent most of her days having sex and cumming gallons of jizz all over the house that her friends had rented for her. The very house she found herself in on the night of her birthday party. They had gone to the liberty of having some custom sex toys made that would accommodate her massive dick that she made full use of. It was the best birthday ever.