I have read Manhwas. Actually a lot have good art and erotic and creative scenes. The problem is most manhwas have these heavy themes and artificial dramas. It is good to have drama to enhance a sense of taboo or forbidden/unfufilled desire but in manhwas the drama is most of the time poorly done and distracts from the erotism.
Erotic stories in the end are love stories. 2 necessary things love stories are emotional connection and forbidden desire. In the case of netorare/netorase, there would be a love story of the Female lead and the NTRguy where they gradually connect emotionally and increases the desire for each other and the opposite happens with the female lead and the main character. Most stories skip the emotional connection and forbidden desire part and goes straight to sex. In the end, it just is a matter of personal preference how much authors put in the build up phase.
Erotic stories in the end are love stories. 2 necessary things love stories are emotional connection and forbidden desire. In the case of netorare/netorase, there would be a love story of the Female lead and the NTRguy where they gradually connect emotionally and increases the desire for each other and the opposite happens with the female lead and the main character. Most stories skip the emotional connection and forbidden desire part and goes straight to sex. In the end, it just is a matter of personal preference how much authors put in the build up phase.