After their third time, they were both so tired that they instantly fell asleep.
Half an hour later, Kim had to come in and wake them up.
"Sleepyheads," she said as she shook them, "you're missing out on your very limited fuck time. You only have another half hour before you need to take a shower and get cleaned up. S-Club meetings can only last so long, even fake ones, and my mom will be getting home soon."
"Okay, Mom!" they both said in whining voices at the same time, because it was the kind of thing they would have joked around about at home.
Alan decided to run with the idea and pleaded, "Can't we fuck just a little bit longer, Mom? Pleeeeeasse?"
Kim stood naked above them, playing the role of a stern and tut-tutting mother. She folded her arms under her medium-sized tits and glared disapprovingly. "I'm sorry. I don't go for all this sibling fucking stuff. You two need to get back to your Service Club meeting." The sight was almost comical because her pussy dripped with her own juices as a visual betrayal of just how aroused she was.
Katherine joked, "But Service Club is all about service. Alan hasn't serviced me nearly enough yet!" She rubbed Alan's now-flaccid penis suggestively and imagined that her true mother, Susan, was the one standing in front of her. Such a racy and erotic thought did wonders for her own libido. She very much wanted her mother to watch. She had visions of Susan crying, "It's so improper!" even as she looked down on her children and frigged herself frantically as they fucked before her eyes.
"I'm sorry, kids," said Kim. "You two are only allowed to fuck each other six times a day. Those are the rules!"
Both Katherine and Alan laughed a bit nervously, because neither had yet told Kim of Alan's medical treatment of needing to orgasm six times a day. Apparently Kim had picked the number out at random, thinking it was an improbably high target.
Katherine turned towards Alan lying beside her and said, "Wouldn't it be delicious if Kim really was our mother instead, standing there like that?"
They both grinned widely.
Katherine reached behind herself and found his dick. "What do you think Mom would think about this?" she said as she guided it into her slit, even while Kim watched her do this with intense interest and longing.
Katherine then said to Kim as a way of explanation, "We haven't really talked about it with each other much, but I think it's safe to say that both Alan and I have fantasies about fucking our very fuckable mother."
That statement came as quite a surprise to Alan. Whoa! I had no idea Sis feels that way towards Mom! But now that I think about it, why should I be surprised? For one, Sis appears to be getting into other women, and for two, Mom is such perfect centerfold material that any female with any bisexual or lesbian tendencies whatsoever would lust after her. Hell, statues would lust after her!
He didn't let the surprise distract him for too long, however, and continued to slowly push his meat into Katherine from behind.
"Now there's a fantasy I can get into," said Kim as she absent-mindedly grabbed one of her own nipples and gently twisted it. "I've seen her at some school functions. I don't think anyone's ever failed to notice her. How can they? She's like a giantess. She must be six feet tall, and she's perfectly built. She's so stacked! With the way she looks, it seems bizarre that she's just a housewife. I'm surprised she hasn't been kidnapped by a rich Arab sheik or something, to add to his collection."
He naughtily suggested as he ran a hand over his sister's left breast, "Well, if the Arab sheik isn't going to do it, maybe the three of us should kidnap her and make her OUR sex slave." Thinking about his mother made him think about tits, so he played with Katherine's.
Katherine added with a devilish smile, "Imagine her all tied up and yelling, 'Help me! Help me get fucked by your big cock, Son!'" She bucked up against his thrusting hips and added, "Just like you're doing to me now, Big ICBM Brother."
Follow on NovᴇlEnglish.nᴇt"ICBM?"
"Inter-Continental Ballistic Missile." She giggled as she suggested, "Or maybe Inter-cunt-inental Ball-slapping Muffin-stuffer. I'm not sure."
He laughed. "But you know, about Mom, it's like you read my mind." He thrust himself forcefully into his sister's cunt some more. "How did you know I've been having fantasies about her?"
"Bro, sometimes you're so thick, and I'm not talking about your dick for once. If you weren't having fantasies about her until recently, then that made you the only one in town. It's like we've got Jayne Mansfield for our mom." She wanted to tease him about how their mother was helping him, but she decided to wait until she knew Kim better before mentioning that in front of her.
"I guess I'm a bit slow at times, Sis," he huffed and puffed. "Hey, why'd you pick Jayne Mansfield of all people?"
"I was trying to think of a famous actress with really, really big tits. With a few exceptions, you kind of have to go back to another era to find the really full-bodied ones." She reached up and tweaked one of her own nipples. A shiver went down her spine, which caused her body to shudder and made her pussy throb even as he continued to plow her slowly and deeply.
"Oh. Good point. Anyway, of course I'd never do anything with her, since she's too prudish, but imagine her coming to pick us up one day and finding the three of us in a three-way. And then instead of getting mad, she rips off her clothes and joins in! I could imagine that actually happening!"
Then he remembered that Kim was listening, so he felt obliged to belatedly add, "Of course these are just fantasies. I would never really think of actually doing anything..."
Kim interrupted, "You two are getting me so hot again! How about we trade moms? Mine's a dear, but she's really let her body go to pot. Anyway, do you mind if I watch this time? I mean, since I kinda am already."
"Sweet Little Sis, do you mind?" he asked. "It's fine with me."
"No prob, Big Hunky Brother. Pull up a chair, Kim, and imagine him pounding into you on Monday."
Kim smiled broadly at Alan. "I think you just might convert me from being a lesbian. But then Katherine is bound to convert me back all over again."
All three fucked and fingered each other and themselves for what seemed like an endless amount of time.
Alan was worked up to his fourth ejaculation of the afternoon. It seemed like he could stay hard forever as he lazily fucked his sister on the bed. The powerful scent of sex in the air grew even thicker with each passing moment.
Kim sat in her chair and worked on her own orgasms. Or at least she tried to sit in her chair. Sometimes she would get so excited that she'd stand up and be practically over them next to the bed while she masturbated herself furiously.
He was half-convinced that Kim would end up in bed with them in a matter of minutes, which prospect didn't bother him at all.
However, she restrained herself. She knew that Alan was too nice to turn her away if she wanted to join them, but also that this needed to mainly be Alan's and Katherine's special time with each other.
Kim grew more vocal as their play continued, acting more and more like the cheerleader that she was. "Come on, Alan! Fuck your sister's pussy!" she cried while she frigged herself. "Show her how good you are, what a good brother you are. Slip it in and fuck her hard! Fuck her deep! Take your big bone and ram it into her. Plant your cock in her cunt!"
"That's what I'm doing, already!" Alan cried out in amused frustration. He and his sister had moved back into the doggy-style position so that he could hammer into her more aggressively.
"Well, keep doing it!" Kim yelled back. "Give her the fucking of her life! Fuck her tight, steamy twat with your monster boner! Stick that bone! You're her brother; fuck her like you mean it!"
Kim liked to point out every few sentences how the two of them were brother and sister, as if they didn't know that fact already. But that encouragement helped keep everyone steamy hot.
At one point, Alan's energy flagged, and he had to take a breather.
Kim, though, was ready to help. "Hey, I am a cheerleader after all. I think you two could use some inspiration." She disappeared for a minute and then came back with her pom-poms. Still naked, she started jumping around, shaking the pom-poms. She made up an improvised cheer:
"Fuck her hard
Fuck her deep
Make her cum
And make her weep!"
Alan and Katherine burst into laughter. Katherine in particular got the "sillies" - she just couldn't stop laughing. Kim's presence was most definitely appreciated.
The whole time Kim had been in the next room, she'd been imagining that it was her instead of Katherine getting fucked. She continued to think along those lines: Katherine is so fucking lucky! Imagine having Alan as a brother! And then Susan as a mother! Fuck! Insane! I never knew I could get off this much on incest until these two came along. Hell, I never seriously even thought about sex with a guy. Now I'm soooo jealous. I honestly want him to fuck me. Fuuuuuccckkk! Oh God! Fuck each other! Ah! Yeah! Fuck me!
Katherine began to have little orgasms, until finally they all merged into one massive orgasm. Just as she began to wildly buck under Alan, he shot his hot seed deep into her vagina.
Kim, too, came with them and staggered back into her chair.
Eventually they all shook themselves out of their reverie.
Kim looked around until her eyes fell on the clock. "It's been more than thirty minutes!" she yelled in sudden agitation. "We're running late. And how am I going to get these sheets cleaned up in time? I wasn't expecting a lake of cum. Shit! I guess I'll have to start the washing machine right now."
"Should we shower together?" Katherine asked her brother in a sexy voice. They dripped with sweat and cum.
He replied, "That would be nice, but I'm totally spent. I don't think I'd be any fun. I have no idea how I'm going to get it up for Nurse Akami tomorrow."
"What's that all about?" asked Kim, very curiously.
Alan realized he shouldn't have said that, and answered vaguely, "That's a secret we'll probably tell you later. We'll have to decide that. It's the story about how this sexual stuff all began. In any case, we don't have any time for stories now. Sis, why don't you and Kim take a shower together? You women can keep going long after us guys are all worn out."
"I don't know about that," said Katherine. She got up, but she obviously had trouble just standing, so she leaned against the wall. "You fucked me so hard, I don't know if I can walk. Kim, you'll just have to help me tend my wounds in the shower."
Follow on Novᴇl-Onlinᴇ.cᴏm"With pleasure!" She threw her pom-poms over her shoulder, glad to forget them when faced with such a tasty proposition. She wondered what it would be like to suck Alan's cum out of Katherine's cunt, if there was enough left.
The showers were quick, since Alan and Katherine were exhausted, sore, and in a hurry.
Kim did help "tend Katherine's wounds" though, and it did turn out there was some cum left to suck out. She was happy to do it.
Everyone got dressed.
Alan and Katherine both spent many minutes kissing Kim goodbye one after the other, just inside her front door. The three of them eventually moved into a group hug and grope.
Private parts began to get uncovered again as the kissing and fondling intensified. But Kim finally said, "My mom is going to be here any minute. Let's save something for next time."
The two Plummer siblings finally and reluctantly disengaged after they had thanked Kim profusely for the use of her house and for her great hospitality.
Alan literally had to hold Katherine up as she walked to the car, she was so wobbly and her crotch was so sore from her first fucking.
As Alan took the wheel of the car, he asked his sister very seriously, "Any regrets?"
She replied without hesitation, "No. None. That was a dream come true. Fuck social convention. Together you and I can overcome anything. What about you?"
"I feel the same. No regrets. I feel like I should be feeling way guilty, but how could anything that feels that good be bad? That was awesome. Thank you, Sis. Thanks for encouraging this... We're a team. We'll stick together and deal with whatever may come."
They held hands and connected deeply as they stared into each other's eyes. It was the most romantic moment either of them had ever experienced.
He said, "I know I said this earlier, but I love you so very, very much!"
She replied, "I know."
He laughed, because he knew that was a reference to a famous line Han Solo told Princess Leia in the Star Wars movies. The fact that they knew each other so well that she knew that he'd catch the reference and really appreciate it just made the sexual intimacy between them that much more satisfying.
Katherine thought, My fuck toy fantasy is a total rush, but this is even better! What I wouldn't give to be his wife and share moments like this forever and ever. It almost makes me sad that the one thing I most want I'll never get. But this is no day for sadness.
And so the most mind-blowing sexual experience that either Katherine or Alan had had in their short lives came to an end.
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