Disclaimer: This story is fictitious and so are the characters. Any resemblance to persons living or dead is strictly coincidental. All characters are 18-years-old or older. All rights reserved.
This story is a fantasy. That means people don't always behave as they would in real life. It leans more towards reluctant than non-consensual sex, but even reluctant sex is truly nonconsensual. It definitely includes incestuous sex. If that bothers you, don't read it. You've been warned. In real life, all non-consensual sex is immoral and illegal, and not condoned by the author.
*****
KRISTINA FALLS
Early the next morning in the kitchen, Kate and her little sister shared a cup of coffee.
"Um, Katie, can we talk about something?" Kristina asked with a tinge of concern edging her voice.
"Sure hon, I'm an open book," Kate answered easily as she took a sip, the first strands of light breaking through the window as the sun was just rising on the warm autumn morning. "What's on your mind?"
"It's just, well, things seem different around here. Looser, you know?" Kristina explained her observations since her arrival the previous day. "I mean, I've known you all my life, sis. You're pretty formal by nature. Running around braless, even at home, isn't exactly your M.O."
"It is a bit unusual, I know," the former gymnast and older sister conceded illusively.
"More than a bit," Kristina replied sarcastically.
"It's just that, there've been some changes here, and David has really grown," Kate hedged on the truth, but hinted at the profound sexual disfunction controlling the Thornton household since David first dominated Allison over two months prior.
"He's really become a man and taken charge of the family since George is absent so often," she suggested.
"So that's why you and the girls are running around with your boobs half on display?" Kristina queried doubtfully. "I mean, I get it with Brit, she's always been a free spirit, but you and Allison?"
Kate looked at her silently, uncertain how to answer the probing inquisition.
"Let's not kid ourselves, Katie, you're too uptight for that," the skeptical sister questioned, "and Allison is well, um, frankly, Allison is just too damn busty to go without support."
"I know. It's been an adjustment, to be sure," Kate excused her behavior inadequately, "but, well, David likes it, and it has been a warm autumn."
"I'm sure David likes it," Kristina acknowledged, eyeballing her discomfited sister warily. "He's 18-years-old, for goodness sakes. What teenage boy wouldn't like women running around the house with their boobs bouncing everywhere?"
"Even their mother and sisters?" she followed disparagingly.
"I get it," Kate said without apology. "You just have to be around him. He's very commanding. When he says something, you just feel like you should do it."
"You mean like wearing tight pants and form-fitting shirts like last night?" Kristina asked with a raised brow.
"Well, yes. He likes us that way, and he really has done a good job of taking care of our, um, needs," the older sister stated cryptically, indirectly alluding to much more than her words indicated.
"Really?" the suspect younger woman doubted.
"Yes, really. He's become the man of the house now," Kate promoted with the hope of her little sister's understanding due to the circumstances of their shared childhood, "and you know how daddy raised us. The man of the house gets things the way he wants them."
"I understand that," Kristina responded with a knowing nod. "Still, daddy is daddy. David's just a kid."
"You'd think so," Kate chided Kristina with a perceptive insight into her submissive sister's future, perhaps recognizing more about David's intent despite her earlier admonition to leave her sister alone, "but you'll see. David takes after dad. He's willful that way. He gets what he wants, or he just takes it."
"Yeah, well, I'll believe that when I see it," Kristina guffawed, ignorantly denying her fate in her nefarious nephew's hands.
*****************************
It was past midnight and the twins were in Brit's room talking openly about their goals for Aunt Kristina and Grandpa Sam's extended visit. David plotted how best to approach his emotionally wounded and intrinsically weak-willed Aunt Kristina, whose slimmed-down body and big tits had undoubtedly caught his attention at the dinner table.
"Shit, she looks better than last year," he commented. "It's hard to tell with what she was wearing, but it looks like she's lost a good fifteen pounds, and not where it counts."
The young wrestler worried particularly about their rugged ex-soldier grandfather's presence.
"You know, we've already planted the idea in grandpa's mind about what's going on around here," Brit offered, not having revealed to her brother that she'd just blown their grandfather. "You know, with the three of us running around with our tits bouncing about and all."
"That's pretty tame in the greater scheme of things, Brit," David discounted his sister, unknowing yet the extent of her 'efforts' with their gramps in the easy chair downstairs.
"I don't think you'll be having any problems with grandpa," she told him assuredly. "I know I saw him checking out my chest, and I'm pretty sure he spied Allison's too."
"I know, he couldn't keep his eyes off any of you," David agreed, but still fretted about the rough and tumble old man.
"Don't be, brother," Brit confided, "it's under control. I just visited grandpa in the den, and let's just say, 'I made his dreams come true.'"
"What?" David asked, puzzled.
"I took care of him, if you know what I mean," the coquettish teen teased. "By the way, grandpa has a big cock, just like you. I'd say you get that big boy from mom's side, ya know?"
"I don't get it," David queried uncertainly.
"Jeez, don't be so stupid, David! I blew him," Brit finally stated it plainly. "I gave the old guy head."
"Shit! Seriously?" the startled youth exclaimed. "You really sucked off grandpa?"
"Absolutely!" Brit chided her brother. "Would I kid about something like that?"
"Well, I, uh, it's just so bold," David said with admiration.
"Yeah, well, let me tell you, grandpa has a big cock," Brit taunted her proud brother. "Maybe even bigger than you. He could give you a run for the money with the ladies of the house."
"Fuck that noise," David retorted, before considering the lurid possibilities after her scandalous admission. "Honestly though, you think he'd be on board? He won't give us shit?"
"Let's just say, I'm putting my money on grandpa getting into mom's panties by tomorrow night," Brit replied with a cold-hearted assuredness. "Maybe sooner."
"That would be awesome to watch," David sincerely expressed his fervent amoral desire to his enterprising twin.
"I've got an idea that's even more fun right now, brother," Brit suggested, anxiously yanking her baby doll nightie over her head to stand naked in front of David. "I gotta say, thinking of mom fucking grandpa is making me horny. I really need a good hard cock, and you've got just the tool for the job."
The athletic soccer star wasted no time in grabbing David's thick prick through his white briefs, giving it a tug and waiting for it to swell in her hand.
"I can't say no to that offer," David grinned, always ready for a romp with his hard-bodied twin sister while leading her over to the bed.
"A good hard fuck and then a good night's sleep," he advised, dipping his mouth to suckle on the teen beauty's rigid pink nipple, before dropping onto Brit's prostrate form as she spread her muscular tanned thighs to accept his dense meat into her steaming hot cunt.
"I have a lot planned for tomorrow and I need to get up early," he reminded simply.
Sliding the head of his spongy crown against the wet opening of Brit's soaking wet twat to slicken the tip with the free-flowing juices glazing the blossoming lips of her puffy labia, David then affirmatively punched the flared knob through to slip effortlessly into the dark channel of his adorable twin sister's delightful cock sheath.
"Unnghh! Well, don't worry about grandpa," Brit reiterated, groaning deeply as her brother eagerly plowed his solid 8" shaft into the very depths of her ready pussy to initiate a vigorous pummeling of the young girl's embracing fuck hole.
"I bet he won't give you any shit if you, ohhh, fuck yesssss," she groaned, "take down Aunt Kristina."
"UNGGH, UGHH," David's only response was a guttural grunt as he gripped Brit's shoulders for leverage to roughly shove his thick meat into her waiting cunt.
"Awwhhh, shit, pound me hard like that, David," the heavily breathing teen beauty snorted around her words as her brother slammed his fat cock fiercely into her nubile twat while laboring to finish her thoughts. "Ughh, fuck, that's good!"
"Just bring gramps in first, unnhhh," Brit sighed between deep gasps. "Maybe send Allie for his wake-up call in the morning. That would do it."
"Great, ungh, idea, Brit," David grunted his approval, certain their brainy big-titted sister sucking their grandfather to consciousness in the morning would be just the trick to gain the tough old man's acceptance of the new order.
"Hell, with the proper motivation, uhhh, grandpa might even, ohh, help you get into Aunt Kristina's panties," the eclipsing girl suggested salaciously as she lost herself in the strong rhythm of her brother's hammering cock, "at least if it gets him a taste too."
