Alan, Susan, and Katherine gathered in Susan's bedroom, so they could have a really big bed to use.
All of them were surprised to discover that the "stealth fucking" idea actually more or less worked. Susan and Alan lay naked, face-up and side to side, while Katherine was face down, on top of Alan. His erection poked up into Katherine's pussy. She nestled her head into his neck and closed her eyes.
Susan managed to snake one of her hands under Alan's thigh, so that she could hold his balls in the palm of her cupped hand and gently stroke his testicles and scrotum, while Katherine "massaged" his cock with her talented pussy.
He couldn't get much traction for fucking in that position, as she wasn't riding him cowgirl, or pushing up and down on him. But that was just fine for what they wanted. She had been practicing her Kegel exercises, so this was a great chance for her to try out various pussy squeezing techniques for real on her brother's cock.
He loved what was happening, because he was able to relax and exert no effort at all, while his dick stayed constantly hard and got expertly massaged by her tight and silky slick sheath.
As Katherine started to squeeze, she said, "Big Concorde Jet Brother, you know, over the past two weeks or so, Aims and I have been doing our Kegel exercises every day in school. While the teacher drones on and on, we just squeeze and release, squeeze and release. It totally helps pass the time, especially since I have the most naughty fantasies about you while I'm doing it. But doing it on you is a million times more fun! What do you think? Am I getting better?"
He groaned, "Much! But, uh, chill out a bit though, okay? Where's the stealth part?"
She reluctantly eased up a bit.
Before long, he was able to hold a reasonably normal conversation with both of them, even as they worked their magic in tandem on his genitals. At first, he didn't even try to direct the topic, because they were both too excitable.
With Katherine focusing her attention on squeezing his boner with her pussy muscles, Susan did most of the talking at first. "Son, I can't tell you how happy I am about what happened today! The collars, of course. The collars!" She squealed with glee. "But perhaps more importantly, you've made so much progress bringing Christine and Glory to heel. Angel, can't you just picture both of them happily enslaved and living with us permanently?"
Katherine paused in her squeezing to consider that. "Wow. That would be weird. I have a hard time picturing Christine fully tamed and collared. She's just so stubborn. And living with my history teacher? That would be really weird. Sharing a stealth blowjob with her under the table while Brother eats breakfast, and then sitting in her class several hours later, acting like just another student? Seriously weird. But cool."
"You've gotta believe!" Susan said emphatically.
As Katherine resumed her squeezing, Alan asked, "Mom, why are you so big on the harem? Sometimes, it seems like you're more excited than I am about adding more busty hotties to our group."
She sighed. She had a hand pinned between her children, so she could gently squeeze his balls as she talked. "Son, as you know, when things started to change two months ago, I resisted reality for far too long. I was always clueless about what was really happening as you slowly seduced and tamed me and the rest of our family, and made us love serving your cock. But now that I've fully embraced my position as one of your sex slaves, I honestly feel like I'm actually a step or two ahead of most others, including you, who haven't really thought through all the implications of our new lifestyle. I've spent a LOT of time thinking about the harem life, and I love absolutely everything about it!"
"Like right now." She moved her trapped hand until she felt where her children were joined. "I almost feel as good as if I'm the one being fucked, just knowing that Angel is. And with each new voluptuous vixen you tame, it's like I gain a new sister and best friend! For instance, look at Brenda. When Suzanne began to rope her into the harem, not that many weeks ago, I didn't know what to think. Maybe I was a little bit jealous about her enormous boobs, and I had a hard time liking her. But now, we're like soul sisters! I'm already closer to her than I am to any of my real sisters, since they obviously can't be allowed to know what my life is really like anymore."
She continued, "As you know, I'm all about family. Despite everything that's happened, I still have those old fashioned family values. The nuclear family unit is dying in this country. Two months ago, I was despairing that you and Angel would soon move away to college and leave me all alone. So imagine my delight when our family bonds suddenly firmed up, strengthening with each new blowjob, and then the family started growing and growing with loving and beautiful people. So even if I weren't a bisexual, I'd still love the harem! I grew up in a big family, with lots of sisters, and now I have that big family again."
Alan found that response very illuminating.
Katherine chimed in, "I agree. It's funny; I never really wanted another sister. But now, Aims and I are so close, and it's great. What would I do without her? And having Aunt Suzy as a second mom totally rocks. It already feels so right, like it's always been that way. So I love the harem for lots of reasons, but that's an important one. And once Brother starts knocking us up, think about how cool it'll be to have all of us share with the mothering!"
Susan thought, Oh boy! That WILL be great. Even though I can't have one of my own, I can live vicariously through my daughters. And others!
Alan groaned with disapproval for that pregnancy line of thinking.
Katherine continued, undeterred, "Now, if you were bringing in selfish bitches like Heather, that would be a whole different thing. It would be a major pain dealing with her 24/7. But the women you pick are real winners. Take Brenda. I mean, she's not just all big tits, bubble butt, and gushing pussy. I've been talking a lot to her lately, and she keeps surprising me with the things she's done, and places she's been, and all kinds of stuff. You'll see what I mean as you get to know her better. So keep it up, Bro!"
He asked, "But isn't there such a thing as too much of a good thing?"
Surprisingly, Susan answered, "Yes. Obviously, the harem can't keep expanding forever. But it won't; don't worry. Just a few more, and then we'll be complete. Our new family." She looked very smug and satisfied with that.
He thought with worry, How many is a few? Who is she thinking of, exactly? And why didn't she say "a couple more" if she's only thinking of Glory and Christine? However, he was afraid to ask her at the moment, for fear that she'd rattle off a long list of names.
Instead, he thought, That reminds me of what Suzanne told me before dinner: "You're at the center of an extended family now, and keeping your cock happy at all times is a big part of what binds us all together." It's strange, but true.
The stealth fucking felt great. The only difficulty that he was having was finding a non-sexual topic and staying on it, because if the women started to get aroused, he knew that the stealth fucking would quickly get a lot more energetic.
He kept trying to direct the conversation to safe areas, but it was remarkable how every topic seemed to lead back to something sexual, and to collars in particular. For instance, he was describing a funny episode of Friends he'd watched some weeks earlier (it had been a long time since he'd had much time to watch TV at all!), when Katherine interrupted, "You know what? That show has three guys basically living with three beautiful women, two of them pretty busty. The guys should just pair off and fuckin' COLLAR the women! Turn 'em into their slaves! That'd fix everything. Like that Ross guy and Rachel. They're always breaking up and getting back together, like every other show. Let him collar her and that'll take care of that problem!"
Susan interjected, "Wait a minute. I don't watch that show very much, but aren't Ross and Monica brother and sister?"
"Yeah?" Katherine asked, with rising excitement. She could guess where her mother was going with this.
Susan grinned enthusiastically. "Well then, I think we should accept Ross as the dominant male and have him collar all three of 'em! After all, when a brother has a sexy, big-titted sister like that, it goes without saying that she needs to spread her legs for her him so she can get seriously FUCKED! And collared!"
"Woo-hoo! Right on!" Katherine squeezed Alan's cock to show her enthusiasm for that idea.
Susan continued, "The other two guys are handsome enough; let them get their own harems. Think about how the ratings of that show would soar if the three women were constantly naked and collared, with dog leashes attached to their collars, all worshipping their master's cock every week."
"Totally!" Katherine exclaimed. "I'd watch every show!"
Alan was forced to say, "Hey, you two, if I hear the word 'collar' one more time, I'm gonna scream. And Sis, you're starting to churn your hips. Be careful. Now, I'm gonna have to pick something different to talk about, because I can't think of that show without getting even more aroused. What should we talk about, this time?"
Katherine suggested, "I know! Let's talk about things women wear around their necks, and how those things, some colored black and starting with the letter 'C', help enslave them to their wonderful brother-masters." She giggled, and then added, "Or son-masters, as the case may be."
Susan smiled as she said, "Angel, thanks for that last part." Mother and daughter high-fived each other.
Alan just groaned. He was both amused and chagrined.