So in the end, it's just with Cecilia that's recommended to behave. With everyone else it's better to be a creep/psycho in order to get more content, plot, scenes...right?With Cecillia there was a consensual scene where you meet her in the caravan and have sex, and a version of it on the "Dark" route where you blackmail/rape her though I'm not sure if that is still in the game, if it is, it's become really difficult to trigger. On the nice route at the party if you get BF drunk and her tipsy you can talk her into wearing her bikini and fucking you on the table next to her passed out BF.
The only other "Nice" content that I'm aware off is extremely limited, Andrea had some really basic stuff with her basketball date (I haven't played the latest nice content that expanded this scene), and Brenda would sext you a couple of photo's if you went nice with her.