One thing that me and my wife have done in the past is to play a game with the questions. Say you ask one, then he asks one. It promotes honesty and it helps inspire topics to talk about.

Plus you'd be able to "secretly" find out how each other feel about something before deciding if it's a safe topic or not.

I personally prefer the "what would you do if..." style XD

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As for her... maybe kiss her on the cheek if she doesn't believe you? XD
But first step would be telling your boyfriend about it, stage 2 isn't that important if stage 1 isn't completed right?
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Honestly... while I may be a bit weird with things like that... I would be more comfortable knowing before her fantasies overwhelmed her rather than after.

I think making sure he knows you love him and that you will never leave him would be a good first step before telling him about it, and asking him if he's ever had thoughts like that might help him relate if he has? o.o

Just throwing possible ideas out there =)

Ping ya just in case Rochiel Silverfire: