Gladly

"I was just going to read. You guys wouldn't want me ruining your party atmosphere, I'll get out of your way."

"Sure we do! Come on, you have to join us."

I was genuinely surprised she wanted me to join them, but I wasn't going to decline an invitation to jump in a spa with 5 hot bikini clad women, even if one of them was my sister. In hindsight, it may have only been Dawn that wanted me to stay.

I went back inside and a few minutes later I was wearing my swimming shorts and lowering myself into the already warm spa. It was a decent size hexagonal spa that easily fits 6 people, although their knees tend to touch. Everyone else was already there and the only empty spot was between the twins so I eased myself in between them. Amanda was wearing a pink bikini that was otherwise identical to Dawns. Good thing they were colour coded, or I wouldn't have known one from the other. Kara, Melissa and Paige sat opposite us and behind them was the sweeping vista of the valley below, still lit by moonlight.

"Ok," announced Melissa, "Justin's here so we can resume out little game of truth or dare."

"What? You guys have been playing truth or dare?" I asked, surprise. Why would they ask me to join a game like that?

"Oh yeah. We've been having lots of fun. Kara was even dared to show us her boobs." Amanda announced.

What? I couldn't believe she would do that, and then be willing to continue playing with a guy. Then again I could tell Melissa and Kara were already pretty drunk so perhaps this wasn't so strange.

Dawn reached out of the spa and picked up a wooden arrow that I hadn't noticed before.

"I believe it was my turn," she said. Then Dawn threw the arrow lightly into the air and spun it. It spun around and landed in the water with a small splash, pointing toward Paige. "Truth or dare?" Dawn asked her.

"Truth."

"Hmm, Have you ever had sex, and with whom?" asked Dawn.

Wow, this had well and truly escalated into the dirty stuff it seemed. I kept my mouth shut so as to not risk reminding Paige that her brother was here. My fear was baseless.

"Gee Dawn, you don't want to ease back into it?" said Paige.

"What? We eased into it earlier, and Justin is probably loving this." She was right, I was loving it.

"Fine. Yes. I fucked Leon Hanks last year."

Leon Hanks, I knew that name. He was that guy Paige went out with for a couple weeks the year before. She fucked him after just a couple dates? Paige grabbed the arrow and spun it into the air. It landed on Amanda.

"Truth." said Amanda, before anybody could ask.

"Have you ever experimented with a girl? if you catch my meaning." Paige asked her.

Hearing my sister ask such a sexy question was quite a turn on. I hadn't heard her talk like that before.

Amanda paused for a while and looked at Dawn, who nodded and said "What the hell, go for it."

Amanda finally answered, and I noticed I was holding my breath, "Actually, yes. We both have," she signaled towards Dawn, "We're bisexual."

Everyone erupted into chaos at the revelation, the sudden squealing and yelling from the other three girls hurt my ears, while simultaneously the thought of some girl on girl action made my shorts begin to stir.

Dawn interrupted everyone almost yelling to put a stop to the other voices, "I prefer men though, just to make that clear."

"But I prefer pussy." added Amanda, with a twinkle in her eye before making her fingers into a “V” and bringing them to her mouth while wildly flicking her tongue around. I was startled at her crassness and realized she was more drunk that I had first thought. I hoped she wouldn't regret coming out of the closet during a game of truth or dare.

When everyone calmed down Amanda picked up the arrow next and spun, it landed on me.