Wrath looks at Five as he explains that he hasn't told Allison yet, and he simply nods at the explanation. It is not Wrath's job to judge when it comes to things like emotions, like revealing one's self. He tends to be as reserved as possible - even with his wife. There were things he did not tell her because of the curse, could not tell her, and other things he chose to keep to himself.

He cannot begin to navigate mortal emotions, relationships, family.

"I will talk to Emilia and let you know when the ritual is ready."

Then he'll have time to talk to his sister about it.