BDSM is really all about communication
gotta build up to it and practice with the rope tying, maybe it can just be foreplay and the actual sex is more 'vanilla' for the guy to not always focus on trying to act more sadistic, they haven't even established a safeword yet as far as i know (tho it wouldn't surprise me if she was satisfied with just the bondage aspect of it or like using toys/blindfolds too)Haha, I was waiting for that nonsense to drop.
Also they never actually had sex? What is this, shonen?