You'll probably get lots of suggestions.

Personally, I'd explore further with her on the phone first...if she's into BDSM...I'd be planning out a lengthy session. If it it strictly the "rape" that is her fantasy...I'd make it fairly quick and hard then boot her out the door. She should definately be restrained the minute she walks in the door either way.

If her main thing is the rape...I'd gag her right off the bat, so she can't object to anything after that. But thats just me.