You might want to look into the group's tumblr. https://oyajidesukara.tumblr.com/post/611802438287196160/your-post-confused-me-as-someone-who-was-born
I think based on what the wife says that she wasn't planning on getting married at all to the biological father, I can see it was a case of wham-bam-thank-you-mister for your semen and that was it.
Agree. They were together all that time as well. Completely in each other’s lives.
Also, the fact that she wanted the child to be legitimate before the law and society, they also say that he is fully Maiko's brother despite having a different father because they are in the same family register.
She pretty much didn't want her child to be seen as an affair child, sibling with different names is not a good look, she wanted to conform to what society want and got away with that.
RIN IS SO CUTE WTF MY OVARIES.
Why do comments say they wasted their years? The only thing missing from their relationship was sex and candy. They still had a meaningful relationship. They were still sweet to each other and still spent every available waking (and sometimes sleeping, apparently) moment they can together. It's probably why it lasted that long with no change because they were satisfied with sharing their time together with someone not them.