Kiwi and Kaoruko seem to have some backstory together, maybe she's her ex?
And Kaoruko feeling good when she goes all out is intriguing, it's different to Utena going sadist but at the same time similar.
Sayo just gets tied up on purpose now.
but we can just pretend it's neglect play for the readers.
People complaining about no BDSM scene, here I am glad we got to see character development.