The final chapter, wherein Maddie finds out Leila's pregnancy is kind of hyper, and might take as little as 8 weeks. Dana tries to cope with her transformation to a weredog, but by moonrise she's entirely sheepdog. Cassie agrees to Sally's plan to seduce more of their teammates, if only to distract the girl from continuing to dominate her with petplay. And then, Leila's animalistic features spread to the other women she's slept with when her fourth trait triggers.

Maddie and Leila visit Tina and Ruth, and much milking ensues. Cassie makes a wager and wins it, involving some public sex and a new permanent nudist. The petplay ladies gather at Jenny's home for a lesbian orgy, but they get gate-crashed by the man she and Hoshi met at the BDSM club, toting a gun and threatening blackmail and rape. Madelyn hatches a desperate plan that leads her to a kind of enlightenment.

Tina has her date with Allie and spreads the milk. Dana gets the heat again, and Allie happily succumbs to it when she visits after escort duties. Maddie and Leila play house with adult baby Ruth. Jenny and Hoshi visit a 'pet-friendly' BDSM club but find it isn't quite what they're looking for. Kara edges toward cowdom, in a behavioral sense.

Many of the characters come to decision points about where they want their lives to lead. Cassie tries to explain the device to Miguel and Dana, recruiting them against Leila, but before the confrontation can happen she winds up fucking a teammate. Maddie has a taste of public humiliation, but it helps her come to terms with her mental dilemma, and she devises a plan.

Cassie trades sex for info with Allie, while Miguel and Dana discuss their mutual roommate issues and have loud sex. Baby Ruth visits Maddie and Leila at the nudist campground and endears herself somewhat to her new Mommies. Jenny and Hoshi have a falling-out with their Owners, and AllieCat convinces Katrina to become KittyKat for a livestream petplay.

Maddie starts to realize that some traits seem contagious. Tina gets zapped again, making her lactation spreadable as well. Maddie and Leila decide to ditch school for a few days to figure things out, but a new function of the device reveals itself, and Leila winds up zapping an old bully of theirs, who they chance to meet on their mini-vacation. Meanwhile, Cassie starts putting the pieces together, but wrongly, while Dana and Miguel have issues at home thanks to their new nudism.

Maddie, Leila, and Cassie engage in a petplay threesome, after which Cassie gets a more advanced form of nudism. Meanwhile, Jenny, Allie, and Hoshi are having a lesbian pet threesome of their own, and spreading their fetishes to the puppy girl. The following day sees Cassie finding the device, but making the same mistake as Leila did, uses it on her friends Dana and Miguel, bringing them into the fold.

Cassie goes permanently nude, Maddie trances her girlfriend and her sister, and Jenny has a petplay date.

Maddie gets involved with her mom and sister's sex games, while Leila starts succumbing to a blackmail attempt by their milky boss Tina. Maddie falls into the trap, too, but turns out to be a bit more clever and ruthless than Tina expected. Their victory celebration is sweet, but results in Leila unwittingly using the device on Maddie while she sleeps.

Maddie turns her roommate Cassie into a nudist (who then seduces some classmates), turns her boss into a lactating breastmilk fetishist, and turns her girlfriend into even more of a bunny.