maybe the character Kate in her questline is better described as a novice/virgin introduced in a situation, where she is more or less subtly from friends/family and hidden organisations (like the club, extensions of it = school) introduced into a bsdm-live.
But Kate is openminded enough to play a very clever submissive form, giving the "innocent victim" but having great fun and is being paid for sex, better as the ordinary whore. She is able to win her goals even against strong obstacles, giving others the opionion that they have won even if it is the other round (for example, staying inside the school after solving the quest with the missing sister, such be paid further on, having much more leeway for living her life (maybe even later on having her own team of playing around).
On the other side (Maxquest) Kate is drastically changing from a good described character to a meaningless one.... always jumping without clever backgroundtext or explications to satisfy Max... playing a difference between the struggle of Max and Alice? Not even possible since the changes, which give Max the greater authority are much easier to fullfill as helping Alice... staying school? Oh, Max has a lifechanging problem with the pills.... quick, help him out since everybody know that permanent sex is healthy
As always, it is a personal observation and depends on the implementations of quests from the author... with putting the focus on Max it might be the natural way of life, that "unnoticed ones" are going down (pun intended).