Eclipse Kingdom

Prologue;
The two emperors have been secretly conversing together for months. Hisashi, the emperor of the night was already preparing the many details, as he sent some of his personal construction workers to continue making a castle. The empress woke up in the middle of the day and rubbed her eyes.
"Darling, what are you doing?" She asked. "I have decided to end the feud with the kingdom of the day." He hummed, making her smile and excited.
"Oh? How so?" She asked as she went to her husband and hugged him. "We marry our youngest sons, that's how. Izuku will marry shinno Shoto to fully unite the two kingdoms." He hummed as he continued on blueprints.
"What is that for then?" Inko inquired, pointing to the castle. "My dear, we can't claim one castle or the other without causing a stir. So we agreed that throughout the cycle of night and day, we combine to create the eclipse castle." Hisashi explained.
"I see, a true reunion of day and night..." she hummed as she played with his hair.
"My darling, this will truly be a magnificent experience to see. The eclipse kingdom is soon to be upon us. And we will see as the sun and the moon align to create it." He hummed as he gave his wife a loving kiss.