He was a prince and you were a princess, two lonely souls who belong together.

The night was silent, the moon was shining, Kaeya and you were waiting for the pavilion where the Fateful Encounter was.

"If I died, what would you do?"

You ask him while you were looking at the moon.

"You are my soulmate, my heart is in your hands. I would throw myself to my death if you were no more."

That was his answer, which he meant seriously.