- A horny young man has sex with Barbara who tells him about her affair with her son. He wonders what it'd be like to hook up with his beautiful sister and their gorgeous mother, while the sister starts thinking about their manly father.
- The film opens with a recap of the original Taboo film, introducing the characters of Barbara Scott, her friend Gina, Barbara's son (and eventual lover) Paul, and Paul's girlfriend Sherry McBride.
As the second film begins, Sherry and her brother Greg Jr. (just called Junior) are driving down the highway. Junior keeps tickling or carressing Sherry's legs and breasts, much to her annoyance. Eventually, she tells him to pull over so that she can go into a card shop and purchase a birthday card for their father's birthday. As it turns out, the card shop, where Barbara is presently employed, is closing for the day, but Barbara agrees to let them come in anyway. Sherry belatedly recognizes Barbara as the mother of her old boyfriend, and inquires about him, as he and Barbara abruptly moved out of their old house some time ago. Barbara tells Sherry that Paul is living with his father. Sherry introduces her brother to Barbara, and goes off to pick out a card while Junior talks (and flirts) with Barbara. He offers to return some tools that Paul left with him to her, and she agrees, giving him her address. She also lets Sherry take the card she's selected without paying for it. As they leave, Barbara is visibly aroused.
In the car, Sherry asks Junior about his behavior towards Barbara. He dismisses her concerns. They arrive home, and Junior lets her out of the car, telling her he'll see her later, and that she should tell their father that the card is from both of them. Sherry asks him where he's going, and he obliquely tells her that he's off to see Barbara.
Barbara is at her house, receiving a naked massage from Gina, who claims that she just wants Barbara to enjoy herself sexually. Gina is throwing a party, and wants Barbara to come. Pursuant to that, she begins rubbing Barbara's vaginal lips. Noting that Barbara is very aroused, Gina realizes that Barbara must have had something sexy happen to her. Barbara confesses about meeting with Junior, and Gina becomes aroused as well. Meanwhile, Junior arrives outside the house. Gina begins performing oral sex on Barbara, and is interrupted by the doorbell. Gina goes to answer it, and lets Junior in, inviting him to help her massage Barbara. During the massage, Barbara opens Junior's pants and begins rubbing Junior's erection. Gina asks Barbara whether Junior reminds her of Paul, letting Junior know about that secret. Junior begins to perform oral sex on Barbara.
At the McBride house, mother Joyce brings out the birthday cake to Sherry and father Greg. Greg starts to blow out the candles, Sherry reminds him to make a wish, and Joyce mutters that she knows what she'd wish for. As a present, Greg receives a shirt, and notes that the card (allegedly from both his children) wasn't signed by Junior. He asks where Junior is, and Joyce defends his absence.
Gina and Barbara are performing oral sex on Junior, and then Barbara has sex with him while he performs oral sex on Gina, who also kisses and caresses Barbara.
Joyce is waiting up for Junior when he returns home later that night. He apologizes for missing the party. She asks about his activities, but when he begins to tell her, she abruptly changes her mind about wanting to know. They say good night, casually kiss on the lips, and Junior watches her ascend the stairs.
In her room, Sherry is doing some exercises while in her chemise. Junior enters without knocking at a moment that gives him a clear view of Sherry's vagina, much to her irritatation. She jumps into bed, but he follows her, and she begins fending off his advances, calling him an oversexed weirdo. Amused by this, he hints at Paul's activities, making her curious to know more. Sherry agrees to let him lick and suckle at one of her breasts if he'll tell her more.
The next day, Sherry is visibly depressed as she speaks with her mother in the kitchen, but says that she can't talk about what's upset her. She will say that she never wants to hear Paul's name again. To cheer her up, Joyce offers to speak with Greg again about getting Sherry a car. Sherry, cheerful again, heads out with a newspaper (checking out used car listings) to the side of the pool. Junior comes out into the kitchen and flirts with his mother, before heading out to talk with Sherry. He begins tickling her again, much to her annoyance, and tells her that he has an erection. Sherry tells him to go masturbate, and he says that he has a better idea.
In the next scene, Junior is having oral sex performed on him by his girlfriend Marylou, who then has sex with him. After climaxing, he asks her whether she'd have sex with her brother if she had one. She says she doesn't know. He tells her that he's been trying to do it with Sherry, but that she hasn't gone for it. He asks her to help her with something that he whispers into her ear. She initially refuses, but gives in momentarily.
Marylou and Sherry are seen walking together and talking about something, but the details of their conversation aren't revealed.
That night, Joyce is aroused while her husband is asleep. She rubs her vagina, and wakes him up to have sex. Unbeknownst to them, Junior comes out of his room to watch them having sex for a moment. Greg achieves climax before Joyce is ready, leaving her unsatisfied. Junior creeps downstairs. Joyce attempts to perform oral sex on Greg, but he stops her as he finds that vulgar.
In her room, Sherry is getting undressed for bed when Junior bursts in on her. She tells him to get out, but he throws himself on her as though they're about to have sex. Sherry threatens to scream and alert their father to what he's doing. Irritated, Junior backs off and leaves after putting all the responsibility for his actions onto Sherry's allegedly provocative behavior.
The next day, Sherry gets off a bus and walks into the building where her father's office is situated. She walks in on him kissing and caressing his secretary, who is sent away while Sherry and Greg talk. Sherry wonders if he thinks the secretary is prettier than she is, and Greg assures her that no one is prettier than his little girl. Sherry asks him about the car again, and he reminds her that her grades must improve first, ascribing her poor academic record to the time she spends with boys who are too old for her. She claims to only be attracted to older men. Greg becomes nostalgic for the past when Sherry was young and sweet. Sherry sits on his lap and claims to still be sweet, even if she is now old enough to have a car. He agrees to go with her and look at cars. Sherry kisses him on the lips and leaves. He resumes his intimacies with the secretary as soon as Sherry goes, though it doesn't become sexually explicit.
Later, Sherry is naked in a hottub with Marylou (implicitly at Marylou's home) and claims that she doesn't understand the other girl's attraction to her brother. Marylou explains it in purely physical terms, and then begins licking and sucking at one of Sherry's breasts, and kisses her. Aroused, Sherry suggests that they go inside.
Sherry lies on a couch while Marylou performs oral sex on her. After a while of this, Sherry opens her eyes to discover that Marylou has traded places with Junior, who is performing oral sex on her. She protests momentarily, but stops before Junior crawls up to begin having sex with her, while Marylou caresses his buttocks and Sherry's breasts. Marylou comments that she's never seen a brother and sister have sex before. After climax, Junior asks Sherry if she's mad at him, and she claims that she's not, but that she's mad at herself. Junior wonders why, as she clearly enjoyed doing it. Sherry says that's why she's mad.
Later, Greg is packing for a business trip while Joyce models some new lingerie. Junior and Sherry come home, and Greg calls her up to ask her about her activities. She says that she was with Junior, and Greg is appeased, saying that it's better that she was with him than some of the other men she's been associating with lately. Greg then returns to his own room, where Joyce asks him about having sex. He claims to be too fatigued. Joyce then asks whether she can go with him on the business trip, but he says she'd just be bored.
Sherry is asleep in her bed when Junior comes into her room and begins fingering her vagina. She wakes up and tells him to stop. He asks why, as they've already had sex. She tells him that it was wrong, and that he should leave. When he stands to go, however, and Sherry sees his exposed erection, she changes her mind and invites him back to bed. Sherry performs oral sex on him before they have sex.
The next day, Joyce and Greg head to the airport. Still in bed with Sherry, Junior gets a phone call from Gina, who's performing oral sex on some guy as she talks to Junior. She invites Junior to the party she told Barbara about, and suggests that he bring his sister as well. Junior wakes Sherry, and they begin having sex again. Joyce returns home, and hears noises coming from Sherry's room. She walks in to ask why they aren't in school, and sees them having sex together. Joyce runs to the phone and tries to call their father, but is told that he isn't available yet. Junior and Sherry flee in his car, as Joyce pours the first of several glasses of vodka.
At Marylou's house, Junior and Marylou are involved in kissing each other while Sherry paces and worries about what her mother will do. She's afraid that Joyce will call their father, and then she'll never get a car. She tells Junior that this is all his fault, and that she won't leave Marylou's place until he fixes matters.
That night, Joyce rehearses what she's going to tell Greg about their children, drinking steadily and growing somewhat inebriated. She goes upstairs and draws herself a bubble bath, carressing herself as she talks to "Greg", but she is actually starting to fantasize about her son. Junior returns home. Joyce has changed into the lingerie she wore earlier. She and Junior talk, and he tries to take full responsibility for what happened by claiming that he couldn't help himself, and begs her not to tell their father. Joyce seems unconcerned by all of this, as she's now quite drunk. She asks Junior to dance with her to a recording that she started earlier. They dance, and then begin kissing and caressing, with Joyce rubbing her son's erection. She has second thoughts about it, but they vanish as she takes a look at the erection, and she performs oral sex on him. They then go up into her room to have sex.
The next day, Joyce is alone in bed when she's awakened by a phone call from Greg, who wants to know about the messages he received. She tells him that she's taken care of it, and he hangs up. She then muses about what she's done.
The party that Gina is holding is an orgy, and she encourages one reluctant couple to get into the swing of things. Barbara is also holding back, and asks Gina if she thinks that Junior and Sherry are really coming to the party. Gina assures her that they will. And, sure enough, Junior, Sherry and Marylou all show up at the door. Barbara greets them, paying particular attention to Sherry while Gina steals Junior away. Barbara comments that there's something different about Sherry, and Sherry replies that she didn't know that it showed. They watch the orgy while Gina sets up a daisy chain. Gina then chooses one man to have sex with her. Barbara caresses Sherry's naked body, and then performs oral sex on her while Junior is having sex with an anonymous woman beside them. They're interrupted by an anonymous man, who performs oral sex on Sherry before having sex with her.
The next day, Greg comes downstairs in his bathrobe to find Sherry making breakfast. (Well, trying to make breakfast, as she doesn't do very well.) Sherry takes a phone call from Greg's secretary, but tells the other woman that Greg is too tired to talk to her. Sherry wants to go out and look at cars with her father, but first he insists on having a talk about how boys only want one thing, and sits her on his lap to do so. She asks him whether he was like the boys that he's describing, whether he did "it" with their mother before they were married, and whether he does "it" with his secretary. Upset by this, Greg asks her to get off his lap, and Sherry says that she likes it on his lap, and that, judging by the bulge that she can feel there, he likes it too. He forces her off and tells her to stop being vulgar. Sherry protests that she just wants to do what they both want, and Greg slaps her. Sherry tearfully apologizes, and he hugs her ... which prompts her to tell him that she can feel his erection again. Greg storms off, unsure whether to be upset or aroused.
That night, Sherry is still sexually excited, and tries to masturbate with one of her stuffed animals. She eventually gets tired of it, and slips out of her room to creep up to her parents room. Being very quiet so as not to wake her mother, she begins performing oral sex on her father. This wakes Greg up, and while he's obviously shocked, he helps her to continue, and has sex with her. Sherry sneaks away again after climax, but Greg is still aroused. So he begins to perform oral sex on Joyce, waking her up, and receiving oral sex from her before they also have sex. Joyce asks what's brought this on ... but before Greg can say anything, she presses a finger to his lips and says that she doesn't want to know.
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