They fucking love each other and it's hidden behind this facade of divinity.
Some Kayle quotes that mess me up emotionally:
Upon killing Morgana:
Kayle: "This world did not deserve you"
Walking near Morgana:
Morgana: "Remember stroling together in the woods, when we were girls?"
Kayle: "Hmph. You never had any fear..."
Morgana: "Huh, funny I remember it differently."
Kayle: "If I... Could see my sister..."