You don't need to be friends with Diego in order to get the Karen scenes. You may need to have already met Eddie, you can do that during Maria's story. At Stage 1 of Maria, talk to Diego and ask him if he fucked Maria yet. He invites you to hang out with him, Eddie, Maria, and Sandra. After that event you can continue Maria's story to stage 9 or 10.Is there any way to become friends with Diego AND reach stage 9-10 with Maria?
I'm asking because I want to see the scenes with Karen at Eddie's Appartment, but Karen only appears when you have a high stage with Maria(9 or 10). Or am I wrong?