Not sure why/if you’re really asking for advice on FWz but hey.

If you want to marry her yadda yadda, don’t do it. Sounds like she has a fantasy (a more common one than you’d expect) and she’d feel safe enough with you to try it out. Since this is happening “on hiatus” it seems like she’s just not worried about offending you or what you might think. It’s one thing to explore your sexuality within a relationship.. but it’s another to try freaky stuff on the way out of one.

Now if you don’t have grand plans with her and you’re both cool with that.. **** her til she screams my name.. video tape it.. post on internets.