I personally don't want to see siwoo and byul's sex scene but honestly who cares it's fictional characters not actual underage human being, obviously it's disturbing if adult characters who look too baby faced doing 18+ stuffs not to mention actual middle schooler characters like that implied smut in "suki desu suzuki-kun", that was disgusting, but 18+ yaoi with high school characters are everywhere, if people don't mind watching euphoria or any movie/tv show with adult actors as teenagers doing sex, why would people get judged to read sex scene between two adult looking 2D drawn characters. It doesn't matter that the actors are 25, they're 'fictionally' teenagers in the movie, just like comic characters, they're 'fictional'. But 'adult comic character with teenager comic character' is different case, even a slightest bit romantic interaction is already uncomfortable, not to mention sexual scene.
For a person who honestly didn't want to see it , you wrote a god damn essay. But no matter what you say, Byul himself doesn't feel comfortable & he indeed believes that he is not an adult to have sex , So wanting to see his sex scenes atleast in this age of his is WRONG .One involved doesn't feel comfortable, who are you to say it's valid .

I wanna see byul's story in 18+ now