Sherlock had been doing a series of tests on you to see your reaction. At first, it was just small things like simple changes in his behavior around you. Now he had been testing how you react to his different touches. He did this all without your knowledge, of course. So, while you were making dinner in the flat, he walked up behind you and gently placed his hands on your hips. He just let them sit there and waited for your reaction, observing you closely