Ashley answers that question for them

The three teens in the cave breathed heavily as they pondered their situation. Heather gave Zack an uneasy look as she recovered from the blissful orgasm she just experienced. Zack couldn’t help but stare at the brunette’s bountiful rack as his cock strained in his bathing suit. Ashley clumsily got to her feet and peered out towards where her boyfriend was. Even though the waterfall obscured her view, she could still feel his eyes on her. She was about to exit the cave when she shook the vision of Brandon from her head and moved towards her two friends.

“A..Ash? What are you doing?” Heather muttered as she realized the blonde was stepping towards her and Zack.

“I’m making sure you two don’t stop on my account!” Ashley replied as she nudged Zack back in between Heather’s legs.

“Ash, we can’t do this to Brandon!” Zack protested.

“Brandon will be fine, Zack. He’s a big boy and he knows I’ve wanted to do something like this for a while. Besides, I’m letting him be with another girl anyway.” Ashley smiled at the boy.

“But Ash, aren’t you afraid of hurting him?” Heather asked.

“Right now, the only one we’re hurting is Zack. Look at how hard he is, Heather.” The younger Woodsen girl pointed towards Zack’s erection as it strained in his bathing suit. “If we leave him in that condition, his balls will be so blue; he won’t be able to walk back to the cabin. Besides, I really want, no, NEED to see you two fuck!”

With that, Ashley began untying Zack’s bathing suit. Unsure of what to do, he looked to Heather for suggestions. He was dismayed to see her looking at him the same way. He was brought back to reality when he felt a hand jerking him off. A hand that was clearly NOT Heather’s.