She doesn't look quite so angry after your apology/explanation, instead adopting a superior look and nodding primly.

"Daddy made Desco in a lab by splicing together demon DNA."

She pauses to consider your question.

"Desco was created to place Big Sis on the throne of the entire world. So Desco has to make sure that the human race survives so that Big Sis can have her ideal world of luxury chocolates and beautiful men pandering to her every whim!"