As to saying it to Vaughn, well, it's not supposed to be an issue anymore, and I just wanted to show that Vaughn and Prynn are really getting along well now.
I don't mean the past problems between them. It's just that I don't think their sexuality is a subject that women would discuss with their fathers. Some might--I don't claim it's impossible--but I'd also expect the father to be disturbed by such a conversation.
But maybe it's just me not following the modern world