You have to hack into Alettas PC in the morning af few times. Ask Aletta, Audrey and Lavish for help. It's an option in the conversation menu. Place the spy cam in your office before the talk at night with Cassidy. Call the accountant from your office when it's available.
Get 100% + spy cam footage to get Cassidy as a pet slave. It's still buggy in my opinion. (No booty call possible) and LP won't go over 40%.
You can also download the walkthrough from this site.