I thought this was going to be a straight forward, cute piece, It's shaping up to be a surprisingly complicated, and slightly dark story, though.
I'm liking the post gender apocalypse anatomy lessons. Even if they are a tad heavy handed. I especially liked Kohane accidentally opening her anatomy book, during her history lesson. That was cute.
So many stories, with women only worlds, leave reproduction an abstract concept. It's nice to see a more clinical approach, for a change. I'm a nerd at heart, after all.
The only thing I didn't like, was the fact that size determines who gets pregnant. It allows a pseudo male/female dynamic, to develop within the relationship. Plus it reminds my of spiders. I would have preferred, if who got pregnant was based on which girl was fertile at the time. Maybe making it possible for both girls to get pregnant at the same time.