This is cute and all, but I fear for the future of the country. What's going to happen when Gran does? Because he obviously can't make an heir. Unless there's magical ways which would be fine because why not. And yes I know that's a whole lot of world building expectations for some smut but usually it does come up as a plot point and it makes me curious.
Be honest, how many of use cried not just because we feel like Aoi but because we have lost hope of ever finding someone who would understand us and love us anyway?