"Show me… show me more," Denny urged.
"Mmmmm-hmmmmmmm," crooned Christy, poking her middle finger into her cunt. "Feels good. 'Specially now that I get to look at your big cock while I'm finger-fucking myself."
"I-I'll jack off along with you, Sis," Denny said.
"No, I've got a better idea."
"Yeah, Sis?"
"I'll suck you instead."
"You sure, Sis?"
"Just put that big cock in my mouth and try me, stud."
Denny sprang off the john. Christy's mouth was wide open. Denny took aim and filled the target with his surging cock. Christy did the rest, deep-throating him to his balls while she continued finger-fucking her own cunt.
"God, Sis, you're terrific!" Denny praised Christy's expert cock-sucking. "Always knew that if you ever gave me one it'd be the best blow-job I ever got."
Christy, though, had just begun to bend her brother's mind with her sexy ways. First, she'd tangle up his spurs some by seeming to go in the opposite direction than the one in which she was actually headed. This occurred when, all at once, she separated her mouth from Denny's hard-on.
"What's wrong, Sis?" he anxiously asked. "You were sucking my prick so good."
"But," Christy said, "I know what'd make me suck it even better."
Denny nervously waited for an explanation.
"This…"
Christy popped her finger out of her cunt and passed it under her brother's nose.
"Smell sweet?" she asked.
Denny nodded.
Then Christy put the same sticky finger in her brother's mouth.
"Taste even sweeter?" she asked.
Denny nodded again.
"Then go for it where it's sweetest," Christy said. "Eat my cunt if you really want your cock sucked as good as it gets."
To get into position to make good on her suggestion, Christy took advantage of what was available on the spot. Leaving her perch, she slithered down into his tub as if it were a sunken bed and spread herself out in all her glory.
"Sixty-nine!" she said.
Denny followed her into the tub without further delay. Facing in the opposite direction, he dangled his cock and balls above her head while looking down at her reeking cunt.
"Go for it!" Christy cried.
Her brother burrowed between her parted thighs, mouth flush with cunt-lips, tongue surging into cunt-gash.
"Mmmmm, that's more like it." Christy moaned with pleasure.
Then she acted to double that pleasure, guiding her brother's cock back into her mouth and down her deep throat.
From there it was prime suction at both ends of the action as if brother and sister had been sixty-nining since they were little kids. Christy came first, feeding Denny all the orgasmic cunt-juice he could swallow. But within moments he'd caught up, his prick unloading with gushing force.
Christy's thirst for her brother's jizz proved to be as much or more than it had been for her cousin Jake's. She couldn't get enough of his cum. Not a precious drop would escape her hunger, as she clung to Denny's cock until his balls were totally drained.
"If you want my cock to stay hard, Sis, you got it," Denny said when Christy had sucked him clean. "You got all my cum this time, but I'll have more to shoot if that's what you want."
"God, do I!" Christy slurped, finally releasing her sucking hold on Denny's cock. "And someplace even better than my mouth the next time you come for me."
"Fuck you, Sis?" Denny eagerly asked.
"Like you're trying to split me in two!" Christy declared.
Then she pushed her brother away so she could move into a better position to get fucked.
When Denny had given her room, Christy slithered out of the tub and then crawled over to the john. There she knelt with her face resting on the lid and her ass raised, in the classic dog-fucking stance.
"Get the idea, stud?" she called.
"You better believe it, Sis!"
That said, Denny moved in behind his sister. In each of his hands he took an ass-cheek and yanked them apart, exposing the yawning splendor of Christy's rear-spread cunt.
"You like it rough, don't you, Sis?" he said.
"What makes you think that?" Christy asked.
"Your tits," Denny said. "Started noticing how bruised they are. You must've really let the last guy who fucked you do a job on you."
"How do you know I wasn't raped?"
"If you were, bet you wound up begging for more."
Christy suddenly had a whim that was more reckless than anything that had gone before. Rape was the key. She'd never been forced into sex before, but like any normal girl she'd always wondered what it would be like. And since her brother was so sure he knew how she'd react, why not make him prove it?
"If I begged for more before, then you ought to be able to make me do it again even more," she said.
"You're really asking for it, Sis," warned her brother.
"So do you have the balls to give it to me?"
Denny reacted to Christy's challenge by squeezing her ass-cheeks so they'd be even more bruised than her tits already were.
"You can be meaner than that." Christy egged him on.
One hand went to her head. Denny grabbed a fistful of her hair and snapped her head back. Then his other hand went for another kind of hair. The wispy thatch at Christy's cunt. He tugged her cunt so her cunt-lips stretched from between her ass-cheeks like pink flaps of rubber.
"Now what do you think, Sis? Am I giving it to you rough enough?"
Christy reacted to the pain by coming on the spot.
"God, you mean it, don't you? You goddamned horny bitch in heat!"
"You raping bastard!"
"Okay, if this is what you really want, it's gonna get worse," Denny said.
"Then pour it on! Treat me like I deserve! Rough as it gets! Rape the shit out of me!" Christy wildly pleaded for the worst.
"Rape the shit out of you, huh?" Denny chuckled. "Baby sister, I just ought to take you at your word on that. Teach you a lesson you'll never forget."
"What's stopping you?" Christy replied.
"You know what that means, Sis?"
"Try me!"
"Damn, then, you got it!"
Once again, Denny was prying apart his sister's ass-cheeks. But this time he didn't focus on her cunt. The much tighter opening had his attention. Denny nudged his chunky cock-head against the puckered dent, ready to go for broke.
"Mmmmm it's like being cherry all over again." Christy panted with anticipation.
"Then you know it's gonna hurt."
"It damned well better!"
"Then take this and put it in your mouth, so you don't wake up everybody in the apartment when you start to scream," Denny said, reaching for a towel.
"You do it for me. Gag me just like you're honest to God raping me." Christy said.
His throbbing cock-head remained poised in striking position. Denny wrapped the towel around his sister's face the way a genuine rapist would do to keep his victim quiet. Then his hands returned to Christy's ass-cheeks as he steadied himself to finally take the plunge.
"No backing out now," he exclaimed, speaking for himself as well as his sister as his crotch violently lurched to force his huge cock into its narrow target.
And so Christy was brutally introduced to backdoor sex. With the towel gagging her, she couldn't cry out as she wanted to, but at least she managed to make herself heard.
"Owwww! Feels like you're ripping me in half, Denny!" she moaned. "Getting my ass fucked for the first time hurts twice as much as when I got my cherry cunt full of cock!"
"You bragging or complaining, Sis?" Denny taunted, shoving even more cock into Christy's rear chute.
Christy responded to his mocking question by coming on the spot. Her orgasmic asshole rippled along the length of her brother's buried cock, letting Denny know for certain that he'd plugged into a keg of female dynamite. For her, twice as much pain equaled twice as much pleasure.
"You're the real goods, Sis. Hell, forget about me raping you. More like the other way around – your ass raping my prick."