Really enjoyed the story. One of the longest that I've read on the Plaza in one sitting, but I couldn't stop reading.
I especially like the character development of Samantha. And I thought you explained her psychology well.
If I have one small constructive suggestion, more time exploring Tony's rather abrupt change of behavior would have been good. Perhaps a few paragraphs more of soul searching on his part where he comes to realize WHY he treated Sam so harshly?
Other than that, the bondage, the corporal, the setting all felt real. It felt like a story that could have actually happened.
Well done.