The next night...

Eventually night did come. We ate at a local pub which was absolutely packed, then headed home at around 9pm. I went to my room to change and headed to the spa. Dawn was already there, and had a surprise for me. At least, I assumed it was Dawn but didn't know for sure since she was completely naked and indistinguishable from her sister without her color coded bikini bottoms. She greeted me with a hug, then did a little spin to show herself off. Her pussy was completely bald, ass nice and round, hips wide. She had a classic hourglass figure with perfect tits and pussy to match. My cock grew to its full length in seconds.

"Wow!" I said, "You're incredibly game tonight."

"I told you I was excited about tonight. I want to suck you off again." she gave me a wink and spun around again to show me her ass, giving it a little slap as she did so. Then she stepped down into the spa and I joined her.

The others came out together, all topless and took their seats in the spa. Amanda sat next to me, placing me once again between 2 smoking hot twins, one of them completely nude. It wasn't long before someone noticed Dawn's condition. The bubbling water obstructs a clear view pretty easily, but the unbroken expanse of pale skin was pretty noticeable.

Paige noticed first, "Dawn! Are you nude?". My sister's tits bounced lightly as she said it.

"Oh yeah. I couldn't be bothered putting something back on after getting undressed." The little exhibitionist then stood up and showed off her ass and pussy to her friends.

Amanda squealed "Woo, go sis. Show off that ass. It's a good one if I do say so myself." Then Amanda stood up and wiggled her hips out of her own bikini bottoms. They dropped to the water revealing her own completely bald pussy. Then she sat on the edge of the spa and lifted her legs out of the water so she could completely remove the rest of her clothing. Once she was done she stood back up and showed us her firm ass, it was identical to Dawns of course. I realized that now they were both nude and side by side, there was absolutely no way to tell them apart. At least not for my untrained eye.

Paige had a hand in front of her agape mouth as her friend completely stripped in front of her.

"One of you needs to grow their pubes out or something so we can tell who's who." I said. They laughed.

As soon as Dawn was done stripping, Melissa stood up and shouted "Yeah, Partaaaaay!", then faster than you could say nudity, the rest of her bathing suit was lying on the balcony as well. Her pussy was the opposite of the twins, darker and covered in wild hair, only trimmed on the sides to prevent anything showing out the sides of her bikini. Kara immediately stood and joined Melissa in getting her kit off. Kara's twat was lovely as well, neatly trimmed into a strip of blonde hair above her slit.

"What about you Paige?" Dawn asked, "feel like a little exposure?"

"Perhaps not, but don't let me bring the party down." she said. Damn, my heart sank slightly. I could see my sister's breasts but I found I now wanted to see what was between her legs as well. Was she shaved? Or wild and bushy?

While I was staring at the bubbly area between my sister's legs, Dawn grabbed my cock in her hand.

"Okay, get back up on the edge so I can suck this beautiful dick again." she commanded me.

"Holy shit, Dawn," Melissa said as I lifted myself out of the water and onto the edge like the night before, "You're becoming a bit of a slut aren't you Dawn? Let me suck him off."