I read this a long time ago and was just looking around and reading some stuff today and thought I'd re-visit it. I actually really like this one. The uncertain, casual relationship the two have over the three years after they first went on a date was interesting. The fact that Yoshino couldn't handle the lack of commitment and left, pretty much without a word, really suggests that, while she realized she was in love with Yae, she didn't think that Yae would return that love in an exclusive manner. She hadn't had any reason to think that she would, frankly, and she had every reason to believe that her relationship with Yae was on the level of sex friend and that Yae was really hetero and not someone who would commit to a lesbian relationship. She may not have thought that Yae could commit to any relationship. It was unclear, but I got the feeling that Yoshino also dated other women during that time, right?
In any event, getting pregnant, despite supposedly not being able to have children changed Yae. (That DOES happen folks. I know a family with four children and the first two were in the same year in school. They were told that she couldn't have children and so they adopted a baby. By the time the adoption was complete, she was already about 6 months pregnant... My grandmother was told she couldn't have anymore kids after having my mom. Nine years later she was totally shocked and I have an aunt...) I think that the part about Yae wishing that Yoshino would have asked for commitment when they were younger is interesting. The fact that she realized that SHE should have made the first move shows maturity. They both grew up and found each other again... That makes for a nice story.