Glancing down at his watch, he saw that it was already nine o'clock. His parents were probably already asleep after all their exercise this afternoon, he jealously thought. God, if it could only be me lying beside my mother in her bed, he groaned to himself. But that would be an impossibility on so many levels. The first being that he wouldn't be lying beside her, he would be on top of her humping away at her pussy. He wanted her so bad his rock-hard cock was aching for her. Maybe it was all in his mind, but it had been difficult controlling his urges before they got to the island. Now it was all he could do to keep from sneaking into her cabana and raping her...

Fuck, I guess I might as well hit the sack, too. Maybe Laura and I can go visit the idol tomorrow and see if it really works for us like it worked for mom and dad. Wouldn't it be something to have his mother wanting his cock as much as he wanted her pussy? Why, the battle would be over then.

Kicking sand over the last few coals, he turned and slowly trudged over to his cabana. Slipping out of his clothes, he flopped down on the bed wondering whether to jack off or not. Maybe he should, so if he and Laura did it tomorrow, he would be able to last longer. If not, as horny as he was, he'd probably blow his wad as soon as he got his cock inside her pussy. But that wouldn't really be a problem either, he laughed to himself. He'd been able to go three or four times in one night before. He just didn't want Laura to think he was a wimp.

Reaching down, he grabbed hold of his cock and began to stroke it. Whacking it harder and harder, he could already feel a burning tickle down in his balls warning him of their imminent eruption.

Suddenly, there was a faint rapping at his door...

"Fuck," he muttered, grabbing the sheet and pulling it up over himself.

Who could it be, he wondered? Was it his mother? Or his father? What did they want? Then it dawned on him that it might be Laura.

"Uh, yeah, come on in," he said, watching the door.

The door quickly opened and he saw the outline of his sister in the faint glow of the moon as she slipped inside and closed the door behind her.

"Laura," he grinned as a ray of light from her flashlight swept across him and then stopped on the silhouette of his cock jutting up against the sheet.

"I'd given up on you," he muttered.

"Well, I'm here now," she said.

Then he watched her as she leaned down and groped his cock through the sheet.

"Jeez, Larry, are you hard all the time?" she giggled.

"I didn't think you were coming so I was taking the problem in hand," he snickered.

"Well, you're going to have to get out from under the sheet," she laughed.

Reaching down, he jerked the sheet back off him as the bed jiggled and shook. As soon as the sheet was gone, he felt her hot hand find his rock-hard cock once again.

"Well, it certainly is hard," she stated as she shined the light down on his rock-hard cock.

"I was thinking about you," he grinned as she slowly worked her hand up and down his cock.

"Uh, uh, before we do anything," he grunted, reaching down and pushing her fist away from his cock, "why don't we sacrifice my hard-on on the goddess's altar and see if it works for us."

"You really think it might work?" she asked him.

"Can you explain what happened while we were watching them fuck?" he grunted.

"Well, no, but maybe it was just the fact it was so exciting watching them fuck," she argued.

"Whatever, let's try it," he grinned into the dark. ......(cont)