Sherlock's interest became confusion for a moment, and then, a bit of pity. He honestly had not been expecting that. Had John never had a good experience being fucked?

"You've never had someone open you up slowly, teasing you and winding you up more and more before they finally fill you up and fuck you?" He asked, genuinely surprised. 'To feel one finger, then two, then three, and maybe even four, slowly opening you up more and more, spreading you wider and wider. " He faded off into a groan... he was going to bend John over and fuck him here,the way this was going.