Girl that just means you won't have a decent relationship in your entire lifetime. And what if the person he dates is gay? You won't be able to do anything then.
In really don't get all this fuss about incest. in our region it's alright to get married to your cousin. It's also acceptable to get married to your mother's brother. though nowadays very few people do that.
It's the first time I cried. I feel so bad for atsuko. God!! I still feel sorry for her. The ending ain't happy enough.