I think you need to heed this advice. Very important what's being said. "Savor" the moment, don't gulp it down. The build-up can, and should, take months, if not years.
I suggest instead of having a black man show up at the hotel room while she's restrained to a bed, let her be swooned at a hotel bar. Let there be conversation, intrigue, eye contact, sexual tension. Let that build on it's own. Let the man (hopefully a smooth talker) do his thing. That stuff right there will be etched in her mind for life. You have to nurture the mental aspect of this as much as, if not more so, than the physical.
You could suggest a black friend or acquaintance come "seduce" her at a lounge. I'd steer clear of actually sitting at the bar (too many eyes, too many ears). More like a high-top or cocktail table IN a bar. Let him work his magic, if he has any. And even if nothing materializes that evening, it'll still be an exciting building block for the next step.
Save the blind-folded, handcuffed idea for one of the middle rounds.