Jane's Private Classes are secret classes between Jane, the Protagonist and Molly.
The classes are available on all routes.
In the first class, the Protagonist uses Suppress on Molly.
If you're on the Heroic Route and told Jane that you're worried about abusing your powers, Molly joins your party.
In the second class, you need access to the Charm spell.
If you're on the Tempted Hero route, Molly joins your party after this class.
In the third class, you need access to the Flirt spell.
In the fourth class, you need access to the Transform spell.
If you transform into Jane during this class and then use Confuse on her, you enslave both Jane and Molly at the same time. This allows you to add Molly into your party from the bedroom as well as changing her personalities.