It depends on the sub's regular dom and there level of power exchange and trust.

I'd want something "contractual" an signed by both... something on the order of "...will provide a fantasy adventure... safety assured... etc" Actually, a video clip would also prove to me who the 'victim' is to be.

The point being the sub won't realize what kind of fantasy is involved... nor the timeframe. I'm actually in early negotiations with a local dom for some kind of scene... this being one of the alternatives.

Tom, your point is well taken... but there are ways to meet and still provide an authentic seeming experience. Afterall, if she's been told her dom is "leasing" her services out and then I, hooded and "anonymous," tell her she's been "sold" for the evening and she has no idea what the scene is going to be... I guarantee I can make it as close to real as SSC can get.