Fortuitous
"It is time to fulfill your duties as princess.”
“Yes, Mother. You know I take my duties very seriously," Caitlyn said, hesitantly.
“I am so pleased to hear you say that. As you know, tensions between Piltover and Zaun have been…high…and, while there is a peace treaty between us, nothing is assured.”
Oh no. Oh no, no, no.
“So, due to the potential for instability, and your commendable commitment to your kingdom, your father and I have decided that the fact that you are both unmarried and eligible is quite fortuitous.”
Caitlyn’s eyes widened a fraction farther, and she could not contain her whispered, “No” as her stomach dropped to her toes and her chest constricted like she had just been thrown from her horse.
“Three days hence, you will marry the eldest child of the Hound of the Underground, and your union will fully secure the peace between our two nations.”
OR
The arranged marriage AU: Caitlyn is princess of Piltover, Vi is nobility in Zaun, and they marry to secure the peace.