Family Therapy
Copyright© 2026 by Vanpeebles
Chapter 4: Aftereffects
Incest Sex Story: Chapter 4: Aftereffects - Upon discovering their eldest son and daughter are having sex, a couple consults a therapist, who plots to have the whole family, as well as her own, join them.
Caution: This Incest Sex Story contains strong sexual content, including Ma/Fa mt/ft Ma/ft mt/Fa Fa/Fa ft/ft Fa/ft Ma/Ma Mult Teenagers Consensual BiSexual Fiction Incest Mother Son Brother Sister Father Daughter Group Sex Orgy Anal Sex Analingus Cream Pie First Masturbation Oral Sex
Molly couldn’t get that last therapy session out of her head. She may have been inexperienced when it came sex, but she wasn’t naïve or stupid; she knew that things like that didn’t usually go on in therapy. She knew it was wrong. But it was so much fun. (And it being wrong was part of the fun.) All that evening and the next day in school she found herself thinking of sex with Thea. And it didn’t escape her notice that Thea looked so much like Alex. Was Dr. Wilson hinting that she should have sex with Alex? It clearly had something to do with Alex and Zach having sex, after all, that was why they were all going to therapy in the first place.
She diddled herself to sleep that night and stumbled through school the next day in a daze of illicit thoughts and fantasies.
She walked home from school and found the house empty. Then she remembered her parents had a session with Dr. Wilson that afternoon. Was Dr. Wilson telling them what she had done with Thea? She wasn’t supposed to; there was confidentiality and all that, but she had concluded the good doctor was a bit crazy; sexy and nice, but crazy. If she was setting up sexual encounters with her patients in her office, she might do anything. But Molly didn’t think that was likely. Her parents were acting somewhat differently than usual, more touchy-feely, but if they knew what had gone on Dr. Wilson’s office, they would be acting way differently.
Molly decided to try to put it out of her mind. She made a snack and took it up to her room. A few minutes later, she heard Alex come home and go to her room. Then she hit on the idea of talking to her older sister. Maybe such things were going on during Alex’s sessions. Talking to Alex might help her make sense of things.
She went to her sister’s room. The door was open and Alex was lying on the bed, a textbook open before her. Molly knocked gently on the door, and Alex looked up.
“Hey, can we talk?” Molly asked.
Alex shrugged and said, “Sure, what’s up?”
Molly walked over and sat on the bed next to her sister. “Did anything weird happen in your therapy sessions?”
From the expression on Alex’s face Molly could tell something had. “Yeah, why do you ask?” said Alex. She wasn’t giving anything up easily.
“There was this girl in the last session with me, and...” Molly trailed off.
“Dr. Wilson had you hug and kiss her, right?”
“How did you know?”
“It happened in Zach and my last session, only it was this older man, Dad’s age. We hugged and kissed him and Dr. Wilson. She even made Zach kiss him.”
“Oh, wow! Was it weird?”
“Yeah, but it was kinda fun. And watching Zach kiss Bill was kinda sexy. Did you kiss the girl and Dr. Wilson?”
“I kissed the girl, but not Dr. Wilson.” Molly decided to go for broke. “Dr. Wilson showed me her pussy, and we both played with ourselves.”
“Oh, my God!”
“You didn’t do anything like that?”
“No, we just hugged and kissed a little. Did you like it?” Then Alex suddenly became concerned for her little sister. The idea that Dr. Wilson was some kind of sexual predator flashed into her mind. “If you didn’t like it or didn’t want to do it, you can tell me.”
“No, it was nothing like that. I liked it. And I played with Thea’s pussy; she’s the girl. And she went down on me.”
Alex’s eyes were wide. “Did you go down on her?”
“No, I just played with her pussy a little with my fingers.”
“Do you think you’re a lesbian? It’s okay if you are. That’s totally cool.”
“I don’t think so. I don’t know. I just know I liked it. But I still think about boys.”
Alex went back into big sister mode. “Look, if anything happens that makes you uncomfortable or if you think you’re being pressured into doing something you don’t want to, you can tell them to stop. If they don’t, walk out and tell me or mom and dad.”
“No, it was nothing like that. I wanted to ... badly. But that’s not the weird part.”
“It gets weirder?”
“Thea looks just like you. Same age, same body, same long, dark hair. She could be your twin, only her eyes are blue. I think Dr. Wilson was trying to get me to think about having sex with you.”
“Oh.”
“I mean, we’re all going to therapy because of you and Zach having sex, and maybe she’s trying to encourage it or maybe it’s some reverse psychology to stop us from having sex. I don’t know what’s going on.”
So, Molly knew about her and Zach, Alex thought. That wasn’t really a surprise. Molly was young, but not stupid. Alex often thought that of the three siblings, she was the most perceptive.
“Yeah, I don’t know either. Both Zach and I thought the hugging and kissing was weird, but we didn’t go as far as you.” Alex paused and thought about what her sister had said about the girl resembling her. “You said you thought Dr. Wilson wanted you to have sex with me; have you ever thought about that?”
“Not until yesterday, now I can’t think about anything else.”
“Come here. Give me a hug,” said Alex.
The two sisters hugged. Molly felt secure and comfortable in her sister’s arms. For the moment, at least, her confusion dissipated. Admitting to what had happened and what she had been thinking had brought relief.
The girls broke the hug, their faces inches away from each other. They looked into each other’s eyes. Then they kissed.
Molly felt Alex’s tongue penetrate her lips, and the two girls intertwined their tongues in an extended open-mouthed kiss. Alex’s hands started roaming over her sister’s body as Molly’s hands slipped down and grasped her sister’s buttocks. After a few moments of reveling in the kiss and her sister’s embrace, Molly broke the kiss and, reaching down, started to tug her sister’s shirt up and over her head. Having tossed the shirt on the floor with the bra quickly following, Molly gave Alex a gentle push until she was lying on the bed.
Then she paused, admiring her sister’s body: pert breasts topped with pink nipples, now hardened until the tips resembled pencil erasers; a slim, lithe torso with a gentle womanly curve that widened ever so slightly into sexy hips. Then as she unfastened the waistband of Alex’s skirt and started tugging it off, Alex raised her legs into the air, allowing Molly to remove it. Her panties followed in short order. For the first time, Molly took a good look at her sister’s pussy. It was beautiful, she thought, pink and partially engorged inner lips protruding ever so slightly topped with a small triangle of black, downy hair.
Molly leaned down and kissed her sister again, then slipped down and took one of her nipples into her mouth.
Alex was amazed. She was the older one, and she had thought she was the more experienced when it came to sex, but clearly, after her experiences in Dr. Wilson’s office Molly knew what she was doing when it came to lesbian stuff. And her little, fourteen-year-old sister, normally so shy and demure, was a tigress in bed. Alex shivered with pleasure as Molly continued suckling at her breast. She could feel herself getting wet down there as Molly switched over to the other breast. Alex closed her eyes and moaned slightly.
She luxuriated in her little sister’s suckling at her breasts for a while, but eventually Alex felt Molly’s lips slowly kissing down her torso. Alex spread her legs as her sister started planting kisses on her pubic mound. But Molly tortured her a little while longer, slipping down to kiss her big sister’s inner thighs.
Then, finally, Molly started licking at Alex’s snatch. The older teen shook gently and moaned as Molly attacked her pussy.
“Oh, my God, Sis! That’s perfect,” moaned Alex.
For her part, Molly didn’t really know what she was doing. She just did what she would enjoy herself. When she masturbated, she like touching her nipples at the beginning. It got her excited and wet. So she started with Alex’s breasts. And she didn’t like having her clit touched until she was good and excited, so she started with her sister’s thigh, working her way to the bud at the center.
But the musky goodness of her sister’s quim was irresistible. Molly had heard other girls, and even boys, in school talking about how dirty and disgusting pussies were, but it wasn’t so, at least from her sample of three. They smelled nice, maybe a little pungent, but not unpleasantly so. And her sister’s tasted clean, just a little tangy. And she liked giving pleasure, almost as much as receiving it.
Alex lifted her head and opened her eyes to look at her little sister munching away between her legs. The girl was focused, determinedly licking away. Then Molly glanced up and their eyes locked. Alex was transported. With that image, her little sister staring into her eyes and mouth buried in her pussy, seared into her brain, Alex closed her eyes again and lay back, letting the orgasm wash over her.
When she was done, she found Molly lying on top of her again, her face inches from her own.
“How was that for a first time?” asked Molly. “Was I good?”
“That wasn’t the first. You did it in Dr. Wilson’s office.”
“No, Thea ate me out. I just played with her pussy.”
“Well, you’re very good, better than you’re brother, and he was pretty good.”
Molly smiled and leaned in. The sisters kissed again.
“Now it’s my turn to try it,” said Alex.
Molly smiled wider and stood up, quickly stripping off her clothes.
Alex looked at her little sister’s body. She was starting to mature. Her breasts were small, but distinct, topped with pert little nipples like her own. Her torso was still like a boy’s but there was now a hint of curve in her slim hips. Her pussy was hairless—almost, a few wisps of light brown hair could be seen above the labia, which were fully engorged with excitement and protruding forth.
The younger girl lay back down on the bed, and her sister climbed on top. They kissed again. Then Alex returned the favor, slipping down to suckle her sister’s breasts before moving down to her quim.
She paused there, taking a good look at her first pussy other than her own. She breathed in, enjoying her little sister’s tangy musk. What would it taste like? There was only one way to tell.
She leaned in and took a lick. Like her sister, Alex found it pleasurable, tangy and a tad salty, but mostly tasteless. The scent, however, excited her like nothing she had ever experienced, except maybe the scent of her brother’s cock, although that was much muskier and stronger than Molly’s quim.
Alex started licking in earnest, and Molly registered her pleasure with moans. Alex lapped at her sister’s slit, thrusting her tongue into her vagina as deep as it would go, and licked up, coming up and over her clit. Each time she did so, Molly moaned. So she concentrated on that, circling her sister’s clit with her tongue.
“Ummm,” moaned Molly, “I want your fingers inside me.”
This surprised Alex, but it made sense. Alex knew from experience that a cock inside her felt wonderful. She didn’t have a cock, but she did have fingers. She slipped one, then two fingers into her little sis while continuing to tongue her clit. Molly’s vagina was tight, but warm and yielding. She started thrusting her fingers in and out as she licked.
Molly could feel the orgasm building. She looked down at her sister resolutely working away at her pussy. It looked very much like it had with Thea the other day, except this was really her sister, not a lookalike.
She leaned back and let the waves of pleasure take her.
When the shaking stopped, the pair cuddled and kissed. But their reverie was interrupted.
“What do we have here?” a male voice proclaimed.
The sister’s looked up in surprise to find Zach at the foot of the bed, a bulge in his crotch. Clearly, their brother had been watching for some time.
“What are doing, Alex?” continued Zach. “Teaching our little sister how to be a lezbo?”
“No, she’s the one who has been initiating me into the sapphic sisterhood.”
Alex had been joking; now he was just confused. “You’re kidding, right?”
“No, our little sister is surprisingly experienced,” said Alex. “And you’ll never guess who’s been teaching her.”
“Really?”
“Yes, but sadly, she’s never even been kissed by a boy.” Turning to Molly, Alex asked, “Do you want Zach to be your first? He’s very good, and gentle.”
Both Molly’s and Zach’s eyes went wide.
“Are you serious?” asked Zach.
“Why not? You fucked me,” said Alex. “What’s another sister? Of course, only if you want to, Molly. You don’t have to.”
Molly nodded vigorously.
“Get your clothes off, big brother,” said Alex.
Zach quickly stripped, and in a moment, he stood before his two sisters completely nude, cock already fully at attention.
Molly couldn’t help but stare at his cock. To her inexperienced eyes, it looked huge. Suddenly she wanted to touch it, to stroke it and see what it felt like. She now saw her big brother in a different light. Molly had seen him naked a few weeks ago, when he was fucking Alex, but she hadn’t gotten a good look at him while he was intwined with their sister. She had always known he was good-looking but never had considered him an object of desire. Here he was, something like a statue of an ancient Greek god, slim and lightly muscled, a nice round butt, and that gorgeous phallus rising out of a patch of pubic hair.
Zach moved to the bed and took Molly’s hands into his own. “Do you want me to kiss you?”
Molly nodded. “Yes,” she whispered. She closed her eyes, and their lips met. The kiss was closed mouth, but hardly chaste, a charge of sexual energy passed between the siblings. They kissed again, this time their tongues intertwined, and the energy was raw and insistent.
Alex leaned back, gently rubbing her pussy and watching her brother and sister. Happy to take herself out of the picture for the moment, as long as she could enjoy the view.
Zach leaned into Molly, and the pair tumbled over onto the bed. They continued to kiss as their hands ran over each other’s body.
Zach felt different than either Alex or Thea, Molly thought. The girls were softer, more yielding, while he was hard and firm. The kissing, while not rough in the least, was also firmer. Kissing Alex and Thea was an exchange; Zach was taking her, and Molly liked it.
In her groping Molly had avoided touching his cock at first, but her wrist absently brushed against it, and something like an electric shock ran through her. She had to have it in her hands, so she reached out and took it in her hand. It was smooth and warm, firm yet pliant. She began to slowly stroke it.
Zach was quickly brought near to orgasm, and he didn’t want to cum this quickly. He broke the kiss, and slipping down so that his cock was out of his sister’s reach, he began to run his tongue around his Molly’s nipples. Her breasts were barely developed, smaller than Alex’s.
Molly enjoyed this, but she really wanted to see his cock up close. She pushed him off her and onto his back and slipped down to his crotch. Inches from her face, his penis looked even bigger than before. It still stood at attention, a glistening drop of pre-cum at the tip.
She looked her older sister and asked, “How do I suck it?”
“Just lick it or put it in your mouth,” said Alex. “I don’t think there’s a wrong way to do it. Just don’t bite down. The underside is especially sensitive.”
Molly decided licking was easier to start with, and she started with a lick at the tip, taking that drop of pre-cum onto her tongue. It was salty. The taste and the pungent, masculine scent of Zach’s groin excited her. When she licked down the shaft and then back up, and when she reached the tip again, she took it into her mouth swallowing about three inches before she felt like she was about to gag. Heeding what her big sister said, she wiggled her tongue back and forth along the underside as she began to bob up and down. Zach moaned lightly in response, and Molly was pleased that she was getting it right.
Then suddenly, Zach erupted, spewing cum into his little sister’s mouth. Molly gagged, and the teen boy’s juices leaked out of her mouth and dripped down over his crotch.
“Geez, Zach,” said Alex. “Give the girl some warning, won’t you. It was her first time. You don’t want to put her off giving blowjobs.”
“Sorry, Molly,” said Zach.
Molly swallowed hard. “That’s okay. It wasn’t so bad, and I like the taste.” But the girl was disappointed to see her brother’s dick rapidly deflate. She wanted to play with it more.
The three siblings cuddled. They talked as the two sisters absent-mindedly stroked their brother’s cock, half hoping to get it hard again.
“So Molly, where did you learn to lick pussy?”
Molly told him about the events in Dr. Wilson’s office. Zach was wide-eyed. He would have dismissed it as her having him on, if he and Alex hadn’t experienced a less extreme version in their session.
“What do you think Dr. Wilson is doing?” asked Zach.
“Molly has two theories,” said Alex. “Tell him, Moll.”
“One is that she just wants us all to have sex with each other,” said Molly. “The other is that it is some kind of reverse psychology to get us to not to have sex with each other.”
“If it’s the second, then it’s obviously not working. Now she’s got Molly roped into it. So I vote for the first one.”
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