i'm stuck with Carl i don't find anyway to complete the C2
As you explore other characters, you may come across situations wwhere you 'burn' them. Effectively disabling the character for the rest of the run.
For Alex, forcing her head down during a blowjob in the forest. For Lina, groping her when she doesn't want you too... And others
You need to ask Carla for advice about a girl, and then burn them in the same run.