Reunited love

3,000 years ago, Y/N, princess of the Demon race had betrayed her own along with her older brother Meliodas, prince of the Demon race and started a Holy War. Although there was nothing Holy about it. Bloodshed was everywhere, and many were lost.

While her brother had betrayed their clan out of love for the Supreme Deity's daughter, Y/N did not have a reason. She only followed Meliodas wherever he went.

Though she soon found the reason. Y/N didn't care anymore about why she or her brother betrayed the Demon clan as long as she had him everything would be fine.

And he was Fairy King Gloxinia. King of the Fairies.

He and Elizabeth then and there had deemed the eldest children of the Demon King, Meliodas and Y/N, their very lovers.

She kept every promise Gloxinia made her keep.

Only if they knew back then that one promise would separate them for thousands of years.

+++
"If something ever happens to me or I do something stupid, I want you to protect Gerheade for me. You two are precious to me; I don't want to see either of you hurt."

"I-Idiot, you shouldn't say stuff like that!"
+++

But Y/N kept that promise anyway and is still keeping it. Vowing to protect all that he loved.

But what Gloxinia and Y/N didn't know was that they both made a promise to themselves. Promising that if either of them ever did anything stupid they would save each other.

+++
"I promise you this. I swear I'm going to save you"
+++