Note: It is probably a good idea to read the first two chapters of this story, in order to get somewhat more enjoyment from the tale below. Thank you, PE.
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"How the hell did you start having sex with Mommy and Daddy?" Paul said shaking his head incredulously.
Paul, a tall good looking boy of 20 sat in the jeans and t-shirt he came home in about three hours earlier, talking to his younger sister Clarissa, an innocent but very attractive young girl of 18 with long red hair and blue eyes. Clarissa had a light sweater on over the t-shirt she had been wearing when three hours before the current conversation; she had seduced her brother into fucking her within an inch of her life. She could still feel a flush on her face and though it almost felt like she felt her brothers very large cock still buried inside her cunt. The pair of shorts she now wore was much looser and more casual than the pair she had worn then, and she sat with her knees tightly drawn together, hands clasped together in her lap; she appeared to be the picture of demure ladylike innocence. Quite a contrast to the earlier slutty persona her brother Paul had been exposed to, to say the least. Clarissa loved her brother just as she loved her mom and dad, but she was also a very sexual being, and she had been slowly over the last couple of months been discovering just how much of one she was. It was strange, she thought, to feel like such a slut much of the time, and like plain old former Girl Scout Clarissa the rest. But after talking to her mom, she had found that her mom was much like her: a thoroughly nice person, who was also an insatiable nymph.
"It kind of started with Daddy, and from there well ... it grew," said the young teen.
"Grew? Well I would say it grew alright," Paul said with a smile, as he reached over and patted his sister on the back lovingly. Paul leaned back and laughed and drew his sister down into his arms, holding her snuggly against the side of his chest.
"Sis? ... Did you really suck off a bunch of guys at my school?"
Clarissa looked up sheepishly at Paul. "How did you find out?"
"Well some guys said, 'Hey Hill, we got blow jobs from your sister,' and as you might think would happen, I took a punch at one guy, and called him a liar."
Clarissa grimaced and spoke in a whisper, "I'm sorry. Did anyone get hurt?"
"Yeah, me," said Paul.
"Really," Clarissa said, in an even smaller voice.
"Well there were like five of them and one of me."
"Maybe I should stop that now; you know now that I have better guys to do."
As Clarissa said this, she ran her small soft hand down over her brother jeans and felt his rapidly growing cock jump as her hand passed over it.
Paul grabbed her hand and pulled it away and as his sister pouted up at him he looked at her and spoke in a tone of reproach. "Mommy and Daddy will be home soon, and I don't think we should start anymore funny business right now."
"But Pauly, Daddy and Mommy like this stuff. I know they want to play with us both. Mommy said she wants to see what you have in your pants," Clarissa said in a sexy little girlish voice that only made things worse for the older brother she scrunched up to on the sofa.
Paul sat up more on the couch and using his considerable muscle lifted his petite sister onto his lap and felt her squirm on his, now stiff rod. Paul groaned slightly feeling his sweet little sis's tight firm ass move on his cock. He curled his arms around her.
"You know it's just ... I don't know if I am ready for ... you know, with them."
Clarissa twisted her neck to look at her big brother and saw he still looked a little shy about this whole thing, and looking at him, seeing him feeling that way, just reminded her all over why she adored him as a brother and as a friend. She kissed his nose, and pressed back against his chest.
"You mustn't feel like that Paul," said Clarissa, "Mom and dad make everything seem just so natural, really."
Paul loved his sis but couldn't get the nagging thought from his mind that this was un-natural; it did seem to be the opposite of all he had ever been taught. Even by his parents. But sitting there like that with her warm sexy butt pressed on his lap, it was hard to deny that -- at least right now -- this all seemed so very right, both for him, and certainly for her.
Paul looked at his sexy sister and, unable to help resist, began to caress her firm breasts through her sweater. Her sweet firm breasts caused him to think about his mom's somewhat larger, but no less sexy rack. Paul wondered how many times he had lain in bed thinking about his mom's tits. It was probably hundreds.
Clarissa purred in her throat as her brother felt her tits up. She knew he was going to get worked up once more and hoped he would be ready to make a move on Mommy later.
The teen-aged girl also was still wondering if her brother had a thing for her best friend, Lindsey. Lindsey was the sexiest girl she knew, and also just like a sister to Clarissa, and -- at least she thought so -- the perfect girl for her brother.
"Paul do you think you might still ask out Lindsey?"
'What?" Paul paused his feeling of his sister's tits and looked at her strangely.
"Lindsey, Paul. Would you ask her out now?"
"Clarissa I just fucked you, and you just basically said, 'Oh goody, now I can fuck you all I want,' and you come and ask me if I still want to date your friend."
"Of course I still want you to date Lindsey. Paul just because you fuck me doesn't mean we are getting married. After all the way I see it Lindsey is just right for you, and I like her, and Mommy likes her, and Daddy likes her, so what could be better.
"Look at it this way, imagine if you guys got married and she became part of the family, why then we could all fuck and be one big happy, right? What could beat that?"
Paul listened to his little sisters strange logic, and then sat and stared of into space for a minute, as his brain processed the strange but somehow compelling argument Clarissa made. It was true that he did indeed think of Lindsey as his ideal girlfriend; and in many ways as real future plan making settle down material. He did however find it odd how his sweet little sister just automatically assumed Lindsey would be just totally into living a life of incest and promiscuity. Of course when his sister talked about her best friend she had always seemed able to almost read her mind, in the past. So anything was possible, Paul thought as he rubbed his sisters' chest gently.
The siblings both heard the front door open simultaneously and both jumped and straightened out their clothes to seem as if nothing untoward was going on. To Clarissa this seemed particularly amusing, especially after she had just finished telling her brother how into playing with them both, her parents would be.