[Benny1]

The truly significant thing here is

Spoiler for Ep 5 speculation:

Natsuhi-sama is being addressed by Virgilia. Natsuhi is fully unrelated to the Ushiromiya family. She has no golden eagle on her clothing. However, Kinzo has always been very tolerant of her. Even though she was unable to conceive for a very long time, half of the reason she was married into the family. Not to mention the entire "wearing the golden eagle on your heart" deal from episode 1.

Kinzo is trying to tell her to "overcome her hardships," so he still seems rather tolerant of her troubles, which he isn't for any of the siblings. Is it possible that though we've been led to believe she has no magic capabilities since she was not from the Ushiromiya family, she was rather pulled into the family because she had spectacular power?

That's about all of the blind speculation I want to give because blind speculation is rather blind.