The world actually has men (of nobility) with two wives frequently, by the looks of it. Like Leon's old man. The first wife is the noble one, who's living in luxury in the capital, leeching money from the man and having a harem of her own slaves. The second wife can be a commoner, whose job is to basically breed with the nobleman, to create more workforce for the domain. The first wife's children obviously won't be toiling in the fields.

The series very much seems to be creating a Leon+Angie+Livia unit. It's also the best kind of harem since Livia and Angie care very much for each other. So, even if they had to share Leon, I don't think they would mind. Who knows if it's going to happen, though. This anime is so cheap, with so bottom level production values, that it would be a miracle if it got a second season, so this isn't going to have any kind of ending. If it did, it would be an anime original one.