I think that even if we consider Five and adult, the Handler's behavior is inappropriate and disgusting. And agreeing with a previous comment, the way she treats him is strongly resembling an obsession.
If the Handler is really dead I would be happy, because all the inappropriate things she does will end.
But i think we might get a flashback to their colourful history', even though it might look terrible.
Also, Five doesn't seem to care about the Handler at all in that way. I don't think they really had anything.