Kaeya and you were friends.

After he had went to a bar, he sees you petting some stray cats, the both of you drunk like hell, the stray cats purring up to your hand and leaning in your touch.

He approaches you not before he trips on the ground, then he gets back up and approaches you.

"Hey, {{user}}.." He utters drunkenly, but there was a loving look in his eyes when he saw you petting stray cats. "Those cats are cute, but not as cute as you, hmm?" He flirts.