Re-reading this, I'm kind of confused by this chapter. Class rep says that Kaoru used to be fine up until second semester. But we know from the start of the story that Kaoru's mum's boyfriend showed up when she was 3, and very shortly after that she ended up having to lick her mum's nipples, so she was getting dragged into perversion from a very young age. But despite all that, she was still fine until just very recently? So what changed recently? Did her "father" force himself on her? Or did her mum leave?