So I forgot about Mermay ANOTHER year but.Little mermaid AU with Arata as the prince and Aoi as the mermaid but Shun (The witch) is actually trying to set them up but fails, because they are idiots and don't act. So Aoi goes back to the ocean and when he is near the land he sings

Arata is late to meet him every time, so he starts singing too when he is on a ship. This goes on until a storm hits the ship he is in and You is drowning. He gets saved by Yoru, who brings them to Aoi. They set it all up since the two were too dramatic to just ask them for help

You and Yoru knew each other since childs. Aoi and Arata get sad about being apart again, BUT the King makes an annoucement about marrying the Witch of the sea, Shun. He knew about a spell to let them meet in each other realm but was playing with them. Everyone ends happy!