Zack and Chloe volunteer to go

"Well, I think I'm gonna head back and check up on my sister," Zack said, walking out of the water. "Anyone need anything from inside?"

"I do," Chloe jumped to her feet. "But I'm gonna go with you."

Zack smiled at his best friend. "Well, c'mon, then."

The duo walked side by side back to the deck, and contrary to Ashley's theory, Hannah wasn't there.

"Huh, Hannah isn't here," Chloe noticed before looking at the cabin through the glass double doors. "And none of them seem to be inside either."

"Maybe they're still at their room," Zack commented as they went inside. "What did you wanted to come back for?"

"Oh, I just wanted to drop off this guide here." The redhead replied, placing the magazine on the dining table.

Zack grinned. "So, enjoying the trip so far?" He asked. "I know you had some reservations about coming."

"I was just worried that someone was going to pressure me into doing something I didn't want to, such as swimming in a bikini," Chloe smiled at him. "But the girls have been really understanding for now."

"I'm glad, it'd be the same without you and Gavin, you know?" Zack admitted.

Chloe chuckled. "I doubt it, you would've just kept yourself occupied by chasing after Victoria." She teased.

Zack shook his head with a small smile. "Yeah, go there and hurt the wounded man," He said playfully before he looked in the direction of the hallway where the lake bedroom was located. "Think they're somewhere in here?"

"Let's go check in their room." Chloe shrugged.

The two best friends went over to the girls' room. "Huh, it's closed, I think they're in there." Zack raised his hand to knock, but at the last second, Chloe held off his arm.

"No!" The blue-eyed redhead whispered. "Didn't you see the socks on the door?"

Zack looked at the doorknob and indeed, there a pair of socks tied in there. "Oh yeah, I wonder why it's here."

Chloe started to feel uneasy at that. "Well, remember when Hannah suggested to put a sock on the doorknob if someone wanted to..." She paused, blushing at the thought. "You know?"

Zack raised his eyebrow, taking a few seconds to understand Chloe's meaning. "Oh!" He remembered, turning his eyes to the door again. "But why'd they put this in here?"

"Maybe they're doing it inside?" Chloe guessed.

Zack's eyes widened. "All three of them?" He felt himself harden at the thought of Hannah being naked, a fact that somehow obscured the possibility of his sister also being naked with the older blonde. "I know you've said once that you suspected my sister and Hannah were girlfriends, but to drag Heather in there too?"

"Well, they don't seem to be anywhere else." Chloe whispered, looking at the door again.

At that moment, a loud female moan could be heard coming from inside the room. Chloe's eyes widened as Zack's cock gave a twitch in his swimming trunks.

"Holy fuck!" He said in a low volume, his hands starting to sweat. "They're really doing it!"

"Zack?" Chloe asked in a warning tone once she saw that her best friend was slowly reaching for the doorknob. "Zack, what are you doing? Stop!"