Later that evening

You and Christina return to the cabin. It’s past dark before your father returns. By then, the two of you have showered and had dinner. You've abandoned bikinis in favour of light tank tops and shorts, and you're both sitting on the couch, your legs sprawled atop each other, watching one of your favourite movies on a laptop.

You look up when your father comes in and say, "Hi, Daddy. How was work?"

"Very productive. How was your day? Did you two manage to find something interesting to do?"

You and Christina share a conspiratorial look before you reply. "Oh yes, we did. Don't worry about us."

Something from the tone of your voice must not have been convincing, because your father comes round the back of the couch. He puts his large, strong hands on your shoulders and begins rubbing them gently. "Look, Ally, I know this wasn't your first choice for a vacation. But try to take it for what it is--an amazing island getaway. And if my work keeps going this smoothly, I promise that I'll be able to spend more time with you before we leave.

You squirm happily under his ministrations. "Mmm, that feels good." Absentmindedly you repeat, "Don't worry about us. We'll make our own fun."

"Good. I have to say, you certainly sound a lot happier than you were this morning."

The shoulder rub is having an unusual side effect. You're getting quite wet. Now, you're not surprised that you're getting turned on by it. But you're surprised that you're getting turned on this much. Your breathing has become heavier, and your pussy feels ... tight. Ready. You find yourself unable to stop picturing what your father's cock must look like in his trousers, what it would look like as it slowly comes erect in your hand before sliding between your lips.

"Mmm."

"Ally, what the fuck?"

You open your eyes. You realize that you've started touching yourself through your shorts. In front of Christina and your father.

"Uh ..."

Christina giggles. Your father sighs. "Really, Ally. What's gotten into you?"