This made it Christy's turn to tease. "You bragging or complaining?"
"Just telling the truth, Sis," Denny said. "You're the best!"
"Then," Christy chuckled through the towel, "I'd better keep living up to my reputation."
She began rocking back and forth on her knees so her tight asshole tugged and hauled her brother's cock. In the process, something gave way within her, in much the same way it did in her cunt when her cherry had been popped. Only this time, rather than blood, the sticky flow which seeped around the cock fucking her was more like female fudge.
"Oooooh, can you feel it?" Christy asked, picking up on the slimy sensation at once. "Feel my fucked ass leaking? Getting your cock so dirty with you know what?"
Denny tested his sister's slippery asshole with what was now his thoroughly lubed cock, sliding back and then lurching forward in to the hilt.
"Yeah, brother dear, that's right, you did it. Kept your promise," Christy said. "Fucked the shit out of me…"
She interrupted herself by shuddering from head to toe.
"… got me shitting and coming at the same time," she moaned with ecstasy. "Coming and shitting."
By now the towel that was supposed to gag Christy had fallen away from her face. So she put it to another use, wadding it in her hand and reaching behind to dab the excess shit which leaked down her inner thighs from her fucked ass. Then she brought the stained towel back to her face and sniffed it, getting high on her own funky aroma.
"Soooo dirty," she joyously murmured. "Just makes me wanna get even nastier."
"Don't see how it could get any dirtier than this, Sis," Denny said.
That was like a dare to Christy in her current frame of mind, and she readily accepted the challenge.
"Can't get any dirtier?" she scoffed. "We'll find out about that."
Denny was curious about where his sister was leading the next. However, to his surprise, Christy now told him to take his cock out of her ass.
"Huh?" He gulped, puzzled why she'd pick this moment to end the butt-fuck just when it was as its filthiest.
"Just do what I say!" Christy snapped.
Denny reluctantly withdrew. Fresh from his sister's shit-pit, his rigid cock looked as if it had been smeared with chocolate.
"Mmmmmm, disgusting, isn't it?" Christy asked over her shoulder as she and her brother both looked at his butt-fucked cock.
"Now what am I supposed to do with my cock?" Denny asked.
"Well, what else?" giggled Christy. "Clean your cock off. I told you, it's disgusting."
"Give me the towel, then…"
"No, silly, I mean clean your cock off the dirtiest way there is," Christy said, continuing to confuse her brother.
"'Fraid you're gonna have to explain better than that, Sis," Denny mumbled. "Dunno what you're talking about."
"Well, actions always speak louder than words, don't they?"
That said, Christy was abruptly no longer kneeling over the john. Instead, she'd bobbed up and around to perch herself on the seat. And, next, one leg angled over so she could prop her foot in the sink. After that, the other leg stretched to rest on the dirty clothes hamper. Her clit seemed to jump out at her brother from between her spread thighs – her wide-open cunt.
Danny reacted, glancing at his filthy cock as he muttered, "You mean you want this…"
His gaze then darted to his sister's yawning cunt.
"… in there?"
"Can't think of a better place to wash your cock clean." Christy giggled some more. "A better, wetter place than my juicy cunt."
But Denny hesitated about filling that pink cunt with a cock so gross as his. Then, as he stalled, Christy lost her patience. Those long legs of hers reached out and seized her startled brother, pulling him tightly into fucking range.
"Remember this?" she asked, waving the towel in Denny's face. "Well, it's not gagging me anymore. So if I start screaming that you really did rape me, everyone'll hear."
"Th-that's not fair, Sis." Denny choked on the threat. "I'd go to jail."
"Not if you play ball by balling my cunt with your dirty cock," Christy said.
Trapped, Denny had to stick his dirty cock into his sister's demanding cunt. And, as soon as he had, Christy slung the towel around his ass, tugging an end in each of her hands to guide the movement of his hips so they'd roll to her liking.
"Oooooh, yes this is how I wanna finish up." Christy moaned, making Denny's cock pump nonstop in her grinding cunt. "Fucked up the ass and then in my cunt by the same big, hard prick! How could any horny little sister ask for anything more from her big, hung brother?"
She was getting awfully loud at this point. Denny broke into a cold sweat worrying about her being overheard by the rest of the family. And what about when she came again? The way she was going, she might raise the roof.
She read his mind. "Still afraid about going to jail, brother dear?"
An ashen Denny nodded.
"Relax," Christy told him. "Relax and enjoy it. You can trust me. Nobody'll know how much I come except me and you."
Then Christy whipped the towel free from her brother's ass, startling him by snapping it in the air. From there, Denny watched her stuff a corner of it in her mouth. And only then did she begin coming.
Sighing with relief as his sister's wails of pleasure were muffled by the towel while she came, Denny took Christy's advice and relaxed and enjoyed the rest of the fuck. Enjoyed it so much that when he shot his wad, he had to grab the other end of the towel and stuff it in his mouth too, silently screaming along with his sister in perfect harmony.
CHAPTER THREE
"Do you think Denny and Elise are happy?" Helen Conway asked her husband when they were on the road again. "They seemed… I don't know… kind of distant from each other, I guess. Maybe it's because Elise is so pregnant and Denny's frustrated. You know how that can be. No…"
Helen quickly glanced over her shoulder, making sure her daughter was still asleep.
"… sex," she said.
Brad Conway promptly laughed out loud.
"What's so funny?" Helen defensively asked.
"You wouldn't worry about their sex life if you'd heard what I did last night." Brad explained his amusement. "Elise might be knocked up as big as a house, but Denny's still getting laid one way or another. If that wasn't him fucking her I was listening to, I don't know what else it could've been."
"Oh, Brad," Helen huffed. "Really. Your language…"
"Think they were screwing in the bathroom, too," Brad said, enjoying the way his wife squirmed. "Maybe Elise leans over the john so that big belly won't get in the way, and Denny balls her doggie-style."
"Will you please stop?" Helen hissed. "I'm sorry I brought it up."
Brad was on a roll, though, merrily adding, "Or maybe Elise takes after her mother-in-law. You always liked my cock up your ass when you were knocked up with our kids. So what do you mean, no sex? You always got your share of cock right up to the ninth month. Why should Elise be any different?"
Helen Conway's whole attitude abruptly changed with her husband's mention of back-door sex. She was a lot more interested in her own sex life than she was in her son and daughter-in-law's.
"Gee, it's been a long time since you did that to me." She sighed.
"Did what?" Brad asked with a smirk.
"You know."
"But maybe I want to hear you actually say it."
"You bastard."
"Say it."
"Give me one good reason."
"Maybe I'll make up for lost time if I hear out loud how much you want it again."
"Would you… really?"
"Try me."
So Helen Conway told her husband what he wanted to hear.
"Fuck me in the ass," she purred, rubbing against her husband in the front seat of the car.
"Tell me more," Brad coaxed.
"I want your big, hard cock ramming into me where I shit," Helen crooned in his ear, while stroking his bulging cock.