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"Get out, or I'll throw you out." Eddie was snarling.
"Umm, hold on Eddie," Mindy purred, eyeing her little brother's straining crotch. "Roy may be right. Maybe he is old enough to join us. And besides, he knows what we've been doing. If he told Mom and Dad, we'd be in some serious trouble, right?.. So, I think we'd better be nice to him."
Eddie got the message and shut up, but he still looked very angry. Roy didn't care. His beautiful, sexy sister had come to his rescue, and now she was looking at his bulging crotch with great interest. Roy moved even closer to give her a better view. His cock gave a lusty lurch, and she grinned even more, licking her lips hungrily.
"Mmmm, MMMMM, little brother, you've really grown up, haven't you?" she cooed.
"Yeah, Sis, I have," Roy leered, dropping his pants.
He wasn't wearing shorts, and Mindy got an instant view of his incredibly stiff teenage cock. This was no little kid standing before her. This was another eager well-hung stud, ready and willing to be her lover. Mindy could hardly believe her luck. Now she had TWO hard cocks to enjoy all vacation.
"Mmmmmmm, now that's what I call a cock!" she murmured.
"You gonna get it on with him?" Eddie growled.
"I sure am," she smiled. "Face it. Eddie, we have to let Roy in on the fun, otherwise he'll have every reason to tell the folks about us. Right, Roy?"
"Right," said their little brother, grinning fiendishly.
In fact, Roy wouldn't have dreamed of telling on his brother and sister, but he could tell Mindy wanted him to say that. She wanted to use every weapon possible to mellow Eddie out and get him to accept a threesome. Now Eddie was looking resigned to what was happening, but far from happy about it.
"Shit," he said, "I suppose you're right. But I get to watch, don't I, Sis?"