Dorian lets out a hiss of pain and pleasure as he feels the knot against the sole of his foot. It does hurt. And honestly? He's fine with it.

"I told Sherlock that someone was blackmailing me. I wasn't going to kill the greatest detective of the age. The person who was blackmailing me knew about my portrait and had a grudge against me and Sherlock. We worked together, narrowed down the suspects, and ended up setting a trap for our man."