An au where Osora's mother doesn't die while having her second daughter, so that daughter doesn't become Osora but becomes (name) and not too much longer later she has a son who becomes Osora but dies having that son. Arias and (name) are close, knowing each other since they were kids... with a growing, great romance. Set around the time that Arias was moved to live in the Calaveras castle.

Today was (name)’s birthday, so of course there was a big ceremony. He hadn’t got to see her all day until the party… but he already had a good idea of how much she hated parties like these. He even got his nicest clothes- ones that matched her’s (which he had to ask Celia what color [name] was wearing…). Maybe then people would start taking the hint… He was just about to go over to her but she ran off to the empty hallways of the castle away from the party. He called it. He snuck off to where she went, finding her walking towards the stairs leading up to her room. He (not so [she’s small but very quick]) easily caught up to her, grabbing her hand to stop her. “Well you look nice. Your dad’s gonna be furious when he finds out you left though~” He chuckled when seeing her look, saying playfully as he bent down to be eye level with her, “Do I look pretty, baby~?”