NEXUS wrote...
I don't know why Shougo can't just explain to his mysterious little sister how they can't get married. Like he could tell her that if they have a child it will have high risks of developing deformities and other serious health problems.
Its anime logic lol. In this kind of situations its either the protagonist gives a vague/not solid statements or creates a misunderstanding. By saying the scientific issues, it might end up the struggle/situation easily.
Another sample of this is why dont they lock the door? why didn't she dress up on the CR? Why the hell didn't he knock first? why didn't she/he confessed right away? why didn't he/she tell her about this to clear the misunderstanding?(hentai) Why didn't she shout when she groped the first time?