Prom is coming up, of course, and none of the girls have dates. Carrie and Sebastian broke up because they didn't talk after they had a fight. Mouse has racist Chinese parents who don't want her dating her black boyfriend. Maggie sucks.
Dorrit has a date, though, if she were to go to the prom. She is dating an 18-year old named Miller and has decided she's ready to have sex with him. He sets up some rose petals, she cries, and they do have sex. Dorrit does the '80s better than the rest of these characters.
Sebastian and Carrie apologize, and get back together briefly. She gets to tell him she loves him. Then, Maggie tells Carrie that she and Sebastian saw her dad making out with some woman in a car, and Carrie misplaces her anger toward Sebastian for not telling her. They fight, and Carrie says they are perhaps too different and she doesn't want to live a life of pain. They break up again. Sebastian is upset with Maggie, and tells her that Walt is probably gay.
Maggie confronts Walt about his homosexuality in the diner. She handles it very poorly, embarrassing him and making it all about her.
Carrie and Walt decide to go to Larissa's going away party in the city on the night of junior prom. Walt can be as gay as he wants to be in the city, and gets to hang out with Bennett, his crush. Larissa gives Carrie some real talk about how being a wife with a white picket fence is not the life for Carrie Bradshaw. This somehow inspires Carrie to love Sebastian with all her might. She leaves the city to tell him she's ready to try again.
Maggie and Sebastian, lonely with their fake IDs, meet in a bar and drown their sorrows. Then, they make out. Carrie arrives later at Sebastian's house and we are denied the dramatic moment of Maggie showing up in just a football jersey and no pants. Maggie is not there, Sebastian lets Carrie tell him all her feelings. He holds her for the rest of the night.
Mouse decides to introduce West to her parents, after a disaster prom date with 14-year old Eugene, a Chinese boy of her parents' choosing. Tom keeps calling the woman he's dating, Deb, "the gym," but eventually accepts that he's ready to date again and his daughters tell him they're OK with it.
The next morning, Maggie visits Carrie and tells her what happened. Carrie tells Maggie how shitty she is as a friend (and as a character), and dumps Maggie. She also refuses to see Sebastian. Instead, in a very satisfying conclusion, Carrie and Walt live together in Larissa's loft for the summer, writing and eating brunch and being fabulous. No idiot boyfriends, fake girlfriends, or picket fences, just city living and an ambiguous future for the show.
We've made it to the finale and Carrie Bradshaw is still a virgin. Now Carrie is a miserable virgin, because she and Sebastian broke up. The plus side is that we get to hear "Missing You" by John Waite. Mouse and Maggie tell Carrie she wasn't even that happy with Sebastian, which is actually true. Sebastian made her life a lot worse, but Mouse and Maggie believe they are lying to make Carrie feel better.
Carrie laments that breaking up before prom might actually be worse than getting dumped on Valentine's Day. Oh my god, PROM. Prom was a big deal in the '80s. Then, we learn that Mouse hasn't told her parents about West because he's black. Her parents are xenophobic, and hate anyone who isn't Chinese. They don't even care that West is as smart as a Chinese person. Mouse's parents want her to date some unfortunate Chinese guy named Eugene. Parents, never name your child Eugene. Everyone will assume he is ugly and lame.
Just when the trio decides to go to prom together and be totally revolutionary, Maggie's sex-cop hookup walks into the diner with a girl. It's not just any girl, it's his fiancé. They leave, and Maggie says they should also invite Walt.
Tom heads to "the gym" (making out with Deb), and Carrie notices that he's wearing cologne. Tom says that it feels good to have a release like working out. Cut to Tom and Deb getting it on. Tom says sex is so much better than going to the gym, and Deb notes that they just did it three times. Tom is like, "I hope I last long enough," and Deb broaches the subject of telling the kids they're dating. Tom is like, "nope!" and that's the end of the conversation for now.
At Interview Magazine, it turns out Larissa is going to Kyoto for the summer to study being a Geisha. So no internship? No, of course there's a job for Carrie. She's going to be the full-time receptionist for no pay. Larissa offers her loft to stay in for the summer along with Walt. Carrie isn't ready to leave because of Sebastian. Whatever.
Carrie goes home to find Dorrit and Miller on the couch, and Sebastian lurking in the corner. Dorrit and her boyfriend character go upstairs, and Sebastian and Carrie talk. Carrie learns that Sebastian and Miller went to the same private school (that he got kicked out of for pot smoking) and Miller is a year older. He's 18, Dorrit is 14. Carrie can't believe her sister is happy, in love, doing sex, and she is none of those things. Sebastian apologizes, and Carrie apologizes back. They confess their love for one another, and I guess prom is back on. Yusssssssssssss.