I thought that was already in the game? I'm pretty sure I remember seeing a scene where they drag sammy to the locker room and bring in some other schoolboys to fuck her, lying about how it was her idea in the first place. It was pretty far along the bully path tho, so to get there you need to never talk to the soccer boys, never obtain any poison, and maintain really low willpower while still going to school every day. Or go into the cheat menu and press the 'bully event' button over and over.
Edit: just tested by spamming the 'bully event' button over and over in a new playthrough, and I never got the pimping scene while I was inside the school building itself, but when I randomly ran into them right outside the entrance on my way in it triggered. So the scene is definitely in the game, but I'm not sure what exactly the triggers are to prompt it.