I'm loving the mental images of the other Primarchs meeting their Sister-In-Law. And the Word Bearers meeting their new Alien Goddess!Step Mother.
Lion: "... but why tho?"
Fulgrim: "How do you get so much volume in your hair?"
Perty: "... but *why* tho?"
Khan: "I am both impressed and disappointed."
Russ: "Begone thot!"
Dorn: "I like it and find its form pleasurable. This is not a good thing." (Perty changes his answer to "I instantly hate it but also think we should trust it. Fuck you, Dorn.")
Konrad: Is dead.
Sanguinius: "Well met, I look forward to a hopeful and prosperous cooperation. But if you break my brother's heart I will kill you."
Ferrus: "But WHY tho"
Guilliman: "I feel a strange sense of kinship with you for the first time, Lorgar."
Mortarion: "I AM GOING TO WEAR HER ENTRAILS AS SWEAT BANDS!!"
Magnus: "A purely warp-constructed intelligence? Fascinating! Do you know how you were created, miss?" *pulls out paper to take notes*
Horus: "BUT WHY THO?!?!"
Vulkan: "Well met, goddess of healing."
Corvus: "BUT! WHY! THO!!!"
Alpharius and Omegon: They don't say it, but they're thinkin' it