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Okay so I skimed through the novel a little, hmm spoiler I guess . . . barely.
I'm just answering your question.
There isn't any FL. To be perfectly honest, there's no romance really, the novel is slice of life more than anything. As of right now at least there's none. Let me reassure you though, this isn't incest. I'm pretty sure the author isn't gonna go there. Like in one chapter, someone asks them seriously about it and Diana and Cain both laugh at their face, and eveyone confirm that it's not a thing.
Unfortunetly, the perveted face thing is just supposed to be a running gag. I agree that it's not really funny. But that's it.
Cain and Diana are just sibbling that are overprotective of each other and nothing more.
There isn't any FL in sight yet.
There's some bit of baiting between Cain and Ilverno but largely there'isnt any romance. As of now the novel is still ongoing.
Does anyone know if this has an FL? Atp I'm starting to be concerned Cain might actually end up with Diana. I get that he adores her but his supposedly "perverted" faces paint a more sinister story.