Sherlock only smiled, nearly benevolently, though it didn't reach his eyes.

Small, tiny circles traced by finger tips, never ceasing, in small rapid succession. Of course the chair did nothing. Could do nothing. It was human contact he needed.

"Come on, Edward." His baritone was smooth as silk. "Work it out. I know you can." His eyes glimmered, slightly. He wanted Edward to work it out. Wanted him to deduce it. He craved the answer to the challenge nearly as much as he craved the touch. "My behavior's changed. How?"