To me it kinda feels like the Milkken family is just entirely fucked up lmao, its like Dexter expects her to try to kill him and is disappointed if she doesnt try or fails to achieve it.
Xanthe even told Dexter that Deus said that Tiffany will be the end of Dexter but Dexter just dismissed it like he knows about it already and expects it (and is proud about it? lol).
My guess is Dexter killed his father too and thats kinda how leadership switches are supposed to happen in this family, attain as much Power as possible, get more powerful than your parent and take what you "deserve" instead of getting it handed over. Like if she isnt able to kill him to aquire power, Dexter considers her a failure (like her sister because shes too soft in his perspective).
A dialoge like "If you want to decide who your husband is yourself, get into the position to make the decisions" from dexter to tiffany wouldnt surprise me at all
Unrelated but one of my most liked renders and scenes:
View attachment 3334958
I just love Bernhardt's attitude lol, no long talks, no bragging around, no flexing. Just deadly, merciless and superior with such ease, im already curious who or what will be able to kill him at some point.