The boys were scared that Betty was going to blackmail them. Ruthie, however, knew better than that.
Smirking back, she saucily called to her big sister, "Well, Betty, what're you waiting for? Isn't it awful hot in here for and those clothes you're wearing?"
"You're right at that," Betty said.
"Yeah, guess you're right at that." Betty answered, just this side of snickering but holding it in to keep the boys in suspense.
Betty lifted her ratty sweatshirt over her head. Her braless tits bobbed free. Carl and Len gulped, their hard-ons, which had collapsed from shock, starting to come back.
Then Betty kicked off her dirty sneakers and filled with her faded jeans. They were so tight she had to squirm to force them down her shapely hips. Underneath, her skimpy panties were caught up in her crotch, revealing bushy clusters of blonde pussy hair.
"Funny thing about the temperature in here," she said, somehow keeping a straight face as she stepped from her fallen jeans. "The more I take off, the hotter I get."
"Well, keep trying," Ruthie suggested. "You're not bare-assed yet."
Betty hooked her thumbs under the elastic of the panties, which were all she still wore. Her brothers hung on her every move, their hard-ons restored and throbbing with anticipation.
Now, sexily stalling on the brink of total nudity, Betty sighed, "I love the way it feels when I take my panties off. Like I'm peeling away an extra layer of skin. Like to take my time and do it real slow. Sorta tease myself – and anybody else who's interested."
She folded the elastic over at the waistband, then doubled it again. And again. The soft roll of her lower belly sloped in exposure, downy with golden fuzz which get up from her still-hidden pussy. Gradually, the panties crept down, folded a fraction of an inch at a time. Now the wispy curls of Betty's bush showed.
"Don't think this is gonna cool me off a bit," she said to Ruthie. "I'm getting hotter every second."
"Here, maybe I can help," Ruthie said, stifling her giggles while the boys followed the strange proceedings in silence.
Ruthie left the bed and went to her practically nude big sister. The panties sagged halfway down Betty's hips now, revealing more than a teasing hint of her cunt's blonde triangle.
"You just relax, Sis," Ruthie cooed. "Let me do the rest."
Kneeling before her sister, Ruthie took over the removal of Betty's panties. Bit by bit they dipped, then finally they no longer covered anything of importance. But Carl and Len couldn't see Betty's cunt because Ruthie's head was directly in front of it.
"See if this cools you down," kid sister said to big sister.
Ruthie blew on Betty's cunt. In response, Betty's hips jerked.
"Ooooh, that makes me hottest of all," Betty moaned.
"I was hoping you'd say that," Ruthie answered, finally allowing herself to giggle out loud.
Without hesitation, Ruthie now planted her mouth on Betty's cunt. Betty's loins began to circle sensually, the way they would if she were getting fucked – for, in a sense, indeed she was.
She murmured. "Oh, yes, Ruthie, yes. Tongue, tongue, tongue. Keep moving it inside my cunt. Feels almost like a cock. Fuck my pussy with your tongue, Sis, and I'll come in your mouth."
Ruthie's slurping filled the room. Then Betty's orgasmic moaning temporarily drowned it out, as she climaxed in her kid sister's face. And, after that, Ruthie's slurping took over again, signaling her thirst for the female cum oozing from her big sister's pussy.
And finally one of the boys found his voice. "Jeez, Ruthie and Betty are gay!"
"No," Len answered Carl, "they're only gay if they only make it with other chicks. When they swing both ways between cock and pussy, they're bi, I read about it in a magazine."
Overhearing them, Betty called, "That's right, boys. Bi's the word. 'Course for a girl to go both ways while she's having her pussy eaten by another girl, she needs the, uh, right kinda input from the other side."
Carl and Len turned toward one another, simultaneously whispering, "She wants some cock!"
"You bet I want some cock. And if I know Ruthie, she wants some too. So how about it, boys?"
Carl and Len jumped to their feet, their jutting cocks twanging. Then, approaching their sisters, they breathlessly discussed who would do what to whom.
They quickly agreed that Carl would take on Ruthie, with Len trying on Betty for size. Betty said that sounded super to her. Ruthie was too busy eating pussy to speak, but she shifted onto all fours so she could be dog-fucked.
Carl went first, slipping his prick into Ruthie's pussy from behind her. She immediately began tossing her hips, giving him plenty of the movement and friction he craved.
"Well, I'm in solid," he called to Len. "Now it's your turn."
Len approached Betty from in back. However, when he arrived within the length of his dick, he realized he'd miscalculated.
"Shit!" he blurted. "How can I fuck her pussy when Ruthie's already eating it?"
And, over her shoulder, Betty calmly answered him, "Since when is a girl's pussy the only place she can take a cock? If you read enough dirty magazines, Len, you ought to know that."
Catching on, Len stammered, "Y-you… mean?"
"Straight up my ass, brother dear," Betty confirmed. "I just took a shit before I wandered down the hall, so the muscles are still nice and stretched. Your big cock'll just slide right up my ass."
"Jesus!" Len gulped. "Losing my cherry with one sister and fucking the other one's ass, all in the same day. Unreal!"
While Ruthie continued to eat her pussy, Betty reached behind herself and spread her rear cheeks. The dusky eye of her asshole seemed to wink at her brother, especially when she playfully failed.
As the aroma made hit nostrils flare, Len choked to Betty, "Could I eat it a little bit first, Sis?"
"Only if you use plenty of tongue," Betty replied. "And ill fart some more, you've got to promise to suck it up."
"Damn, I'd eat your shit, Sis," Len recklessly vowed.
"Don't worry, you'll get a taste if you give my ass a rim-job," Betty chuckled.
Len knelt, immediately wedging his face between the cheeks of Betty's ass. Then his tongue briefly swirled around the rim of her asshole.
"Stick it in!" Betty urged.
She failed again, opening up the narrow ass tunnel so Len's tongue could surge inside. And the instant he was rimming her ass, he could feel the bump from Ruthie's tongue a notch away in Betty's pussy.
"Ooooh, that's it," Betty moaned, "rub your tongues together. Make me come in both holes at the same time."
Len and Ruthie strained to satisfy Betty's orgasmic craving. Within seconds they had succeeded.
"Fantastic coming!" Betty swooned.
And, all at once, Ruthie was coming too. For as she'd been tonguing Betty's pussy, her own cunt had been steadily dog-fucked by Carl from behind. The friction built until Ruthie's senses exploded.
"Mmmm, I know my kid sister's coming," Betty sighed. "I can feel the vibes."
Then Betty held Ruthie's head while the latter clutched her big sister's loins and they lingered in the glory of their shared orgasms. For a moment it was almost as if Carl and Len had been forgotten. But the boys were too horny to remain ignored for long.
"Hey, Ruthie, I'm the one fucking you," Carl snapped. "You're only coming 'cause it's my prick in your cunt. Like this!"
He thrust his prick so hard and deep in Ruthie's cunt that she reared up from Betty's cunt and squealed. Then, after temporarily pulling out until only his cockhead remained, he rammed her again.
"Oh, you're right… so right, Carl," Ruthie croaked.
"It's your cock in my cunt that's got me coming like this. As long as you fuck me, you're the boss. All I want to do is keep coming, coming for you!"
"Hear that Len?" Carl called to his brother. "I shaped the bitch up fast. And unless you're a wimp, you'll do the same thing to Betty. Give her your cock back there and make her beg for more!"
"Yes, yes," Betty agreed with Carl. "Fuck me where I shit, Len. Fuck my butt with your big, hard cock!"
Len got to his feet. He shoved his prick between Betty's asscheeks while he and his sister were both standing.
"Higher, just a little bit higher," Betty rasped, directing his cockhead toward her tightest fuck-hole. "There, that's it! All you have to do is shove your cock in and you'll be fucking my ass."
Len gripped her hips, spreading her plump asscheeks as he set his loins, then surged. His rigid cock shot into her ass chute, not inch by inch but the whole thing in a single thrust.
"Ooooh, you're ripping me! Ripping me so fucking good!" Betty groaned with welcome pain. "Nothing gets me off like a big, mean cock up my butt."
She climaxed on the spot, rubbing her pussy to go along with the prick in her ass. Female cum dripped through her fingers and trickled like piss down her inner thighs.
Then Betty called down to Ruthie, "Hope you're coming as much from Carl's cock in your cunt, Sis, as I am from Len's cock in mine."
"God, Sis!" Ruthie called back. "If I was coming any harder I'd pass out. What a couple of studs!"
Betty enthusiastically agreed that Carl and Len were true cocksmen. Then, making a comparison, she blurted, "Neither Matt or Barry fucked me any better than this."
With their big sister's surprise mention of their cousins, Carl and Len abruptly froze in mid-fuck. Ruthie just shook her head, sighing in response to the can of worms Betty had now recklessly opened.
"Oops, maybe I should've kept my mouth shut," Betty sighed, recognizing the shock-wave she'd launched.
"Your timing isn't the greatest," Ruthie told her sister. "But as long as Carl and Len are involved, they had to find out about the rest of it sooner or later anyway."
"The rest of what?" Carl demanded to know. "What've Matt and Barry got to do with Len and me?"
"You heard Betty," Ruthie said, no nonsense now.
"Me, too," Ruthie revealed. Then she dropped the biggest bombshell yet. "And right now they're off someplace fucking Mom. And after she hears about what you guys have been up to with Betty and me, she'll probably want you to suck and fuck her too."
"Fuck my own mother?" Len choked.
"Mom's a dynamite piece of ass," Ruthie assured her brothers. "Betty and I can swear to that."
It was Carl's turn to choke. "You two made it with Mom?"
Ruthie and Betty both nodded. "The three of us took turns fucking with a dildo. Then Betty and I turned Mom onto Matt and Barry," Ruthie said.
Carl choked again. "What kind of crazy family is this?"
"One I wouldn't trade for any other family in the world!" Betty stated. "I've fucked around plenty the last few years, but sucking and fucking with my own family is the best trip there is."
"Betty's right," Ruthie agreed. "I'd still be cherry if it wasn't for family fucking. And so would you boys."
Carl and Len couldn't argue with their situ's last point. Earlier today they'd been nothing more than a couple of frustrated jack-off artists, and now Carl had his cock in Ruthie's cunt and Len was fucking Betty's asshole.
The boys looked at one another, silently trying to make up their minds where to go from here. Their sisters helped them decide, rolling their hips so Carl's prick moved in Ruthie's pussy and Len felt the rippling friction from Betty's tugging shitpit.
"And what happens after we're finished fucking you here today?" Carl asked.
"We hang together," Ruthie said. "All for one and one for all – no jealousy, no squealing on each other, up double-crosses. And no outsiders! One, big, happy fucking family."
"But what about Dad?" Len asked. "And if Matt and Barry are into it too, what about Uncle Bob and Aunt Aggie?"
"Right now they're the enemy," Ruthie said. "But as long as they're still family, you never know! Blood is thicker than water, and jizz and pussy juice are thickest of all."
It was the first time Betty had thought of their father, uncle and aunt as possible converts to incest. But by now she'd had enough experience with her kid sister not to sell Ruthie short. Therefore, she automatically backed Ruthie up.
"You can't lose with the stuff we use," Betty joked.
"Trust us!" Ruthie said.
"And fuck us!" Betty eagerly added.
Carl and Len were sold. "I'd rather sign on with the devil than go back to being cherry. Let's fuck!" Len cried.
So, their hard cocks in motion again, Carl and Len respectively resumed fucking Ruthie's clit in Betty's ass. Since each boy was operating from behind his sister, the girls faced one another. Ruthie took advantage of it by beginning to eat Betty's pussy once more.
"Mmmm," Len reported, "I can feel Ruthie's tongue in Betty's pussy while I'm fucking butt. It's practically like getting my cock licked at the same time I'm fucking!"
"I wouldn't mind trying something like that myself," Carl readily admitted.
"Well, the way we've got ourselves ganged up on each other now I can't get to Ruthie with my tongue," Betty told Carl. "But if you switch your cock to her ass, I can sure reach down and finger-fuck her cunt. It'll be like I'm jacking you off while you're fucking her butt."
Carl needed no further persuasion. Abruptly he yanked his prick from Ruthie's cunt. Then his cockhead mashed into the dent of the much tighter opening a notch away. After setting his hips he shoved, drilling his prickmeat into his sister's ass tunnel.
"Damn, I just love a cock up my ass!" Ruthie squealed, temporarily interrupting her pussy-eating. "Now finger-fuck my cunt, Betty, like you said you would."
Betty's hand was immediately down between her sister's legs, digging into Ruthie's pussy.
"Ooooh, can I feel that!" Ruthie rasped. "How about you, Carl? Betty finger-fucking my pussy deep enough so you can feel it with your cock in my ass?"
"Sure as hell," Carl answered. "It's a butt fuck and a hand-job at the same time."
"Then let's make sure Len gets the same treatment," Ruthie said.
She went back to eating her sister's cunt. The thin wall between Betty's pussy and asshole hardly seemed to exist, as Ruthie's tongue simultaneously stimulated her brother's prick and sister's cunt…
"Come twice as much is right," Len agreed. "And it won't be long for me."
"Me neither," Carl called back. "How about it, wanna shoot our wads in them together?"
"If you mean you gonna come now, I'm right there with you."
"Then here goes."
The twins strained, jamming their pricks to the balls up their sisters' assholes. At the same time in the girls' cunts, Betty swapped her finger-fucking for Ruthie's tongue-fucking.
The boys groaned with erotic release. The girls orgasmically moaned. All four of them were now coming at the same time. Hot jizz poured into female assholes from spurting cocks and pussies overflowed with bubbling honey.
The hung on to their climaxes along as they could but finally it was over. Their naked bodies gradually untangled, sagging in a row on the bedroom floor.
"Mmmm, that was utterly fabulous," Betty sighed. "Just wish Mom could've been here too. Can't wait to toil her when she gets back from fucking Matt and Barry." And suddenly Ruthie popped up. "Wait, I've got an idea. Let's not tell Mom about Carl and Len, after all."
"You mean keep these studs all to ourselves," Betty giggled. Then, getting serious, she added, "It's tempting, but we can't go behind Mom's back now…"
"Not a double-cross, silly," Ruthie said. "I mean that instead of just telling main about Carl and Len, what if she found out what studs they are first-hand? Now listen to this…"