Amanda and Claire wander off...so you follow.

"A body of water, you say," Amanda says, "After setting up our tents, that might feel nice. Don't you think so, Claire?"
"Oh, of course," she replies, "That sounds great."
"Then it's settled. You two set up your tents and get stuff ready. We'll go cool off."

The two quickly run off, not even stopping to grab their swimsuits, a towel or anything else.
You and Lacey share a look that says 'Something is up!'

"What were they really doing while we were gone," you ask, "I mean, their tents are up, but..."
"Yours is probably up to. You're thinking what I'm thinking," Lacey says, "They were having fun without us."
"So...they're into girls?"
"Don't knock it," Lacey says, "I've done my fair share of it. Although, it's only a diversion from cock for me."
"Oh, I get it. Girls are hot. If I notice and feel it, I'm sure that you do too," you reply, "Speaking of which..."
"You want to go see them, don't you?"
"Hell yeah."
"I do too...but we already interrupted them once today. Do we want to do that again?"
"I didn't say anything about that," you say, "I just want to watch. In fact, after they finish, maybe we can let them sneak a peek at us."
"Now your true motivation is clear," replies Lacey, "You dirty, dirty boy."

You smile.

"You didn't say 'no' though."
"I didn't. Let's go, dirty boy."

You two take the familiar trail down towards the water.
You go up to the same rock formation, being much more careful this time.
You get down low and hide behind a bush. The two of you glance down at the water...

Amanda and Claire and completely naked, their clothes thrown into two piles on the ground. They are standing right in front of each other and making out. Amanda's hand is rubbing Claire's ass, while Claire's is rubbing Amanda's breasts.

"Damn," you whisper to Lacey.
"I know," she replies in kind.

After a couple of minutes, the two break off their kiss. They share a look of pure, unadulterated passion.

"I've wanted to kiss you like this for so long," Amanda says.
"Me too," Claire replies, "Lacey told me that you were a great kisser. She wasn't lying."

You look over at Lacey, who appears to be blushing.
You whisper 'Tell me later' in her ear, to which she nods.

"Let's get in the water," Amanda says, "I have a special treat for you."

The two walk hand-in-hand into the water and wade in a bit.
Amanda gives Claire a sultry look and suddenly submerges under the water.

"What did you have in mi-OH SHIT," Claire exclaims, reacting to some unseen stimulation, "Oh yeah- right there."

"Is she," you start to whisper.
"Yes, she is," Lacey says, answering your unfinished question, "I taught her proper breath control in our pool a while back."
"Naughty girl."

You focus your attention back on the others. Judging by the array of sounds and faces that she is making, you gather that Claire is close to orgasm.

"Oh shit, oh shit, oh shit," she cries out, "Make me cum. Make me cu-uuuumm!"

You and Lacey enjoy the sight of the young lady's explosion of pure bliss. It's breath-taking.

After about a minute, a fully-wet Amanda re-emerges from the water. Claire grabs her and kisses her hard on the mouth.

"I owe you big time for that," she says, "Whatever you want, I'll do it."