Does she just constantly have erect nipples throughout the story or something?
Edit: This story is pretty trashy anyway. If they're going to censor clothed nipples, and it's going for a fanservice-y ecchi harem route, I think everyone's better off reading something a little more blatant. Like Yuuragi Inn, To-Love-Ru Darkness, or just genuine episodic(Tag: "Story Arc$") porn.