"Unheard of does not mean impossible," Arella argued, sitting up straighter in the bath. The water rippled with her movement, and her wings shifted slightly in the water. She tried to keep her holy power steady to prevent the call from dropping.
"It means impossible, Arella. Our kind and their kind simply do not function the same way." Castiel's voice was low. Arella knew that tone he was using. It was the tone he used whenever she was being difficult. Although he could not see her, she pouted, "Stop pouting, Ella. Think about it logically. The bonds formed by demons help to strengthen and balance out their magic, to draw power from the bond and protect what they hold dear. Angels do not function the same. Our essence is holy, already balanced. Bonds simply aren't in our nature."