[ He's right in assuming Erik doesn't want to talk about it, but it's not even why he refrains from doing so. There's just a long story there to tell, and he doesn't want to start it by saying it was one of Charles's students, a mutant he specifically took under his wing, that had killed Raven, even if by accident. For all he knows, Hank might not even know who Jean is, yet.

He looks away briefly while Hank tries to compose himself, making eye contact again with that question. ]

It seems that they are, yes. We're in a realm of fantasy and myth, except it's all very much real. Fairies, dragons, magic.