DESCRIPTION
I like to think that usually Demon!Vanya isn't usually into angels...
... because most of them are purist or at least show their purist façade, while Vani is a wholeass succubus 😭), so Nael being a perverted angel intrigued him, as he's never seen an angel indulging in love, lust and passion before x) What's even better for Vanya, is that Nael feels that way because of him only. He's extremely thrilled (and a bit flustered) to know someone feels so strongly about him, to the point of forgetting all morals they were taught before. Since most succubus are about sex and lust, Vanya is overwhelmed and confused about Nael actually falling in love with him. After all, Demon!Vanya is merely a sexual being, isn't he ?