Satomine Night
The Power of Z!
Also noticed that Lillie referred to Delia as okaasama, which is a very polite and respectful way of saying "mother".
I noticed that, too. It's just another example of how extremely formal she is. (She does use watakushi, which is the most formal way of saying "I.") It also makes her a stark, rather amusing contrast to super casual Ash.