All of them!

The feminine gasp is clearly Emma! She's definitely the shyest of the three girls, so I figure if I pretend I'm still asleep, she'll just walk away and act like she didn't see anything.

...I figured wrong.

My eyes are still closed and I'm carefully controlling my breathing to mimic the slow, deep breaths of sleep, but the floodlights from the parking lot are still shining into the room. The door closes and I assume Emma has left, but instead the light switches on. I reflexively groan and Emma lets out another audible gasp. Mustering any and all acting skills I have, I pretend that the light turning on merely stirred me in my sleep, but didn't wake me. Hopefully Emma is just coming into the room to do something.

"Wow..."

With my eyes closed, it's easier to pinpoint the direction of that voice. Lying on my side like I am, I can tell Emma is behind me. So was that wow...? Couldn't be. No way a pure girl like Emma was staring at my bare ass, let alone impressed by it.

Footsteps let me know she's moving. "I shouldn't stare, I shouldn't stare... I was just relieved that he was asleep when I took my bikini off... Now I'm doing what I was afraid he was doing? Bad, Emma..." She's talking to herself? And she's naked?! Wait, what time is it? Were the girls out swimming in the pool? Did I miss my chance to see them in swimsuits?

The door slams open. "Oi, Emma, where-"

"SHHHHH!!!"

It's Amy, but Emma just shushed her!

"What's going-Oh!" That's Natasha and she seems to catch on sooner than Amy, since the 'oh' was nearly whispered.

"Is he...?" Amy asks.

"He's asleep," Emma whispers.

"Really, Ems? You're naked and alone with a boy?" Natasha asks, a smirk clear in her voice.

"I-I-I forgot he was in here! A-And I'm glad he was asleep and can't see me!"

"Wow, dude's out like a light. He can't see us... but we can see him."

"Amy, what're you-"

Emma is cut off by something I can't see and I hear the carpet rustling. "I heard from his sisters. Georgie may be kinda scrawny, but he has a massive cock!"

The sharp intake of breath I involuntarily make is masked by Emma gasping and Natasha snickering. "Seriously? Georgie? What, we talkin' like an above-average six inches?" Natasha asks.

"Ha! Maybe when he's soft. No, I heard from his sisters that this thing is massive! And he's a grower, at that!"

"Seriously?" Natasha asks. "I wanna see him hard, then!"

"Well, Nat? Go rub that thing."

"What? No, you rub it!"