It's one thing to be able to do a ballet lift, it's another entirely to have studied the art. It's the difference between her being impressed and her falling in love with him again. She pictures a young Sherlock in studio in dance clothes, practicing, or on stage in tights and costume executing leaps and turns and lifts.

"I had no idea," she says, still breathless, but now it's because she's getting turned on. Christ. Whether it's intentional or not, he's practically seducing her with ballet.