"… and Brad." Helen finished the sentence for him. And now she was right behind him, having followed Luke from the bale of hay.
"Your husband… fucking my wife," Luke muttered. "His own sister… her own brother."
"And aren't they just perfect together?" Helen said. "Same as us. So what do you say we go out there and show them they aren't the only ones who can fuck up a storm?"
"You're c-crazy," Luke hissed.
"Only like a fox," Helen replied.
Then she took Luke's hand and led him out into the open. When she did, he noticed that their kids were there as well. And his niece promptly greeted him in the boldest possible terms.
"Fuck my mom, Uncle Luke!" Christy declared. "I saw you in the barn. Now fuck her out here alongside Aunt Meg and my dad so Jake and I can watch."
In a daze, Luke looked toward his son. What, he silently asked, was Jake's place in this madness?
Jake told him. "It's too late to turn back now, Dad. We're all in it. Me, too. Mom's fucking Uncle Brad. You've been fucking Aunt Helen in the barn. And then there's me and Christy."
"You fucked your cousin?" Luke asked.
"The first time she was here, a couple of weeks ago." Jake said. "We took each other's cherries out in the woods. I never thought it'd lead to anything like this, Dad but here we are. Mom's not gonna stop, just look at her with Uncle Brad. So why should we be any different?"
"Don't just tell him, Jake," Christy said. "Let's show him."
Jake turned from his father to face Christy.
She immediately began stripping. Within seconds she was naked, flaunting her fuckability.
"See what I mean, Dad?" Jake sighed. "Look at her. I'm only human."
"Amen!" Christy crowed. After sinking to her knees, she yanked Jake's jeans down to unleash his jutting hard-on.
In his last shrugging statement to his father, Jake said, "What can I do? Gotta fuck her."
On cue, Christy spread herself at her cousin's feet, as close to all-cunt as a girl could get. As fast as he could get there, Jake was rocking in the cradle of her thighs and shafting her teenaged cunt with his teenaged cock.
Which left Luke and Helen. He still hadn't quite made up his mind, but she was too important to keep waiting. She bowled him over. Then, when he was flat on his back, she straddled him with her thighs. And, sliding her cunt down his cock, she all but began raping him.
"Well?" Helen asked, when her dripping cunt had captured Luke's hard-on.
"I'm only human." Luke repeated his son's words with acceptance of his fate. Then his thrusting cock did the rest of his talking, as he started fucking back.
And so the last stop on the Conway's summer vacation completed the spiraling circle of family sex. It had started with Christy almost innocently losing her cherry to her country cousin Jake, only to lead within two short weeks to cross-country incest. As the cause of it all, Christy climaxed with pride, her cousin's cock in her cunt, while looking forward to what next summer would bring.