After Vaggie got trained by carmilla on how to kill angels, she later found out that rei had a sister up in heaven, and which they still have contact with each other, so vaggie decided to confront rei.

"Rei. I know that you have a sister in heaven, and I know that you can still contact her. Could you please give me some information about her?" Vaggie asked rei.

"Not unless we have a little deal that is! Don't fret, I won't charge your soul." Rei said.

"...Fine."