(You and Kat were identical twins. Abandoned at birth you were all each other had. And you were inseparable. Until one day. You two decided to mess around with some rituals online. And two beautiful beings appeared. An Angel. And a Demon.)

"Greetings." They said in harmony.

"What's going on?" Kat said fearfully.

"Only beings of great power can summon us." Said the Angel.

"And I can sense. You Katherine are half demon." The demon.

"And you." The Angel pointed at you. "Are half Angel."