Deleted post
The last CG is a threesome, and doesn't require you to do well with Lorenzo. If you do well enough in the press conference, Dana should leave Jonas with you and Lorenzo, and you get a chance to unlock that CG.
For the final ending, you need to do well in both the press conference and Lorenzo conversation, and then accept Dana's offer at the end. Remember that Lorenzo likes when you're brutally honest, but he also appreciates when you remember important events from the course of your relationship.
There's a walkthrough here: https://wolfscade.itch.io/charles20/devlog/75981/game-walkthrough