The Protagonist is confronted by Val, who has been freed from his/her control in the streets.
The Protagonist decides to set the rest of the slaves free.
That's all there is to it.
Note that this is just a general outline for the route. It is not a walkthrough.
Meeting Valerie in the Streets
After having enslaved at least three people - of which one must be Ms. Rack and another must be Val - as well as having seen the second of Jane's Private Classes, Val will confront you in the streets, where she'll explain that she was freed from your control and says she refuses to stay around for much longer. Instead, she hurries off.
Realizing that the others might be unhappy as slaves as well, the Protagonist heads to the school to speak to Dr. Tiff.
Freeing the Slaves
Dr. Tiff asks the Protagonist who s/he wants to free.
Sarah will be grateful to be free, warning the Protagonist that s/he is on thin ice but won't leave the party.
However, if the Protagonist refused to heal Sarah in the hallway early on in the game, after having confronted the Protagonist about his/her behavior in the streets, Sarah calls the Protagonist an asshole and storms off.
Originally, she would not leave the party even if you didn't heal her in the streets. However, after a suggestion from a fan, it was added in as it would make more sense.
If you had sex with Sarah (or used the Grapple spell to enslave her), she'll speak to the Protagonist in the hallway where the Protagonist can either deny it (which pisses Sarah off) or confirm it, which she's thankful for that s/he does, as it means that the Protagonist at least has the decency to admit it.
Julia says she'd prefer to speak with the Protagonist in private in the library.
Cassandra says "Fuck you" and "Fuck off" before storming off.
Molly apologises and quickly hurries off.
Ms. Rack teases Dr. Tiff for a while before being freed, causing Dr. Tiff to grow increasingly angry at her.
Jane, meanwhile, tries to enslave Dr. Tiff using one of her modified Chakrams. If you tell her not to do so, she'll willingly be released by Dr. Tiff and leaves the room.
Once one or more slave is freed, Val meets with the Protagonist in the school hallway. She asks if the Protagonist has started releasing his/her slaves, to which the Protagonist confirms that s/he has. Val tries to cheer him/her up, saying she's there in case s/he needs someone to talk to. The Protagonist thanks her before leaving.
If you attend Dr. Tiff's secret class, she'll quietly tell the Protagonist that s/he is lucky that s/he started releasing his/her slaves before coming to the class.
If the Protagonist speaks to Sarah and enslaved her using the Grapple spell or played with her while she was a slave, the Protagonist can either deny it, causing Sarah to remark that she has memories of it happening. She gets angry at the Protagonist for doing it and then not admitting to it.
Should the Protagonist confirm that s/he did in fact play with Sarah - or used the Grapple spell - Sarah is relieved that the Protagonist at least admits to it and admits she thought it was pretty hot.
Talking to Dr. Tiff
After freeing the slaves, the Protagonist may speak with Dr. Tiff for a bit. She'll remark that she's glad that the Protagonist released his/her slaves, but warns him/her about pushing his/her luck about it again.
If the Protagonist uses flirt, after a short conversation, Dr. Tiff's eyes becomes blank - implying she's in her Mindless form - and says that one shouldn't get too attached to students. She quickly snaps out of it and when asked by the Protagonist what happened, she says that nothing happened and that the Protagonist should hurry on instead. The Protagonist leaves, but is confused about the scene to begin with.
If the Protagonist is KO'd after having used Flirt on her, the Protagonist can cast Flirt on her again in order to start dating her.
Unfreeable
Currently, only Angie is unfreeable due to Dr. Tiff being unable to do so in good conscience.