Corruption Catharsis

what's a kiss that feels good? we'll end up kissing like this again tomorrow, won't we…? her boyfriend's extremely controlling behavior is making shuna emotionless. that's when a tutor is hired to teach her at home. “i'll teach you about more than just schoolwork.” huh? what is he saying? what do kusunoki-sensei's fascinating words and behaviors end up making shuna do?