Thank you! I also did not sense any fetishism I the scene. It really was just a phenomena that happened because as explained in the earlier pages, the two alters were vying for the host position. Also they were the two alters who were deeply involved with Yuuma. Call it rape or what, but the person has become more vulnerable as they go through therapy, and having stimulated by intense emotions, like sex or lust will definitely affect the system of the alters.

I truly appreciate translators notes however I don't think it is totally fair to judge the author especially since we can't read Japanese for one, two things gets lost in translation and three all these can be compounded by a
Very difficult to understand topic. That last scene if anything could be a byproduct of the therapy itself where a triggered situation such as miko bringing the subconscious reality behind kazuha and reis relationships to light, can lead to sex becoming more complicated. This is the first time it got to this extreme given that rei was the only one who had been having sex with Yuma. The sex was just a medium by which to show a dynamic at play. Being the partner of someone with mental illness is extremely difficult and though the switches may have seemed a bit excessive, it only shows how hard this is also for Yuma. To me, that scene was just stressful. The struggle between rei and kazuha over yuma is simply an eagerness to find solid ground through the exploration of love. Otherwise kazuha would not want to be the host. Its like two pieces of you yearning for the same thing.