Going with the cliche' "I don't usually like BSDM but . . . " I very quickly warmed to this. I think mostly that is because of Silence's behavior with Harry. They were playing and naturally the S&M roles established, but afterward he was so kind and when Harry called out his safeword they stopped and he didn't push him to continue, which seems to not happen in fic often enough, IMO. The level of detail and description you used were wonderful from the ropes to Harry feeling like he was flying. It's interesting to imagine what will happen once they realize who the other is. Great job.