Why does Uriel love Dokja?

To be clear: Dokja is one of the best protagonists I've ever read about. He's the best.

But Uriel is said to be a righteous Angel of Eden, enemy of evil. A hard, no nonsense killer except in Dokja's world line.

In Dokja's line though, she's a blushing, giggling teenager. Obsessed with her "husband".

Why such a stark contrast?