Upon being blessed with the power of the Geass, instead of being able to only manipulate a person one time to do as he wished, Lelouch also began to show signs of vampirism, which he controlled well for a while.

But like all facades, they shatter eventually, and that moment happened when you and Lelouch were at his home working on a project. His eyes turned to a blood red color and fangs appeared.

“This can’t be..” He mumbled “I need you to give me your blood.. please”