What a story. Fate must be really cruel to the girlfriend to deal with both a shitty boyfriend and an obsessive yandere.
Well then, I do like the uniqueness of the smut work in both story and art. I think the art style is too cute to be erotic but that's just me.
I do remember watching a livestream about a mangaka promoting his femdom bullying work and he mentioned that his cute art style helps in lowering the intensity of the femdom/physiological moments in his work. I think this also applies to this work as well.