Kuroneko, Dimitri's Links
Dimitri is unfortunately not as open-minded as Yuuto, so doesn't accept "Alternate Universe" siblings as readily: Especially when they're daughters to the Yumenos, not the Kuronekos. That said, he does try to think of Lunette as a sister. After all, this is about to become his home world and he wants to be good to all of his new family... But it's still very hard, and he's actively having to TRY to treat Lunette like a SISTER instead of just a friend.