He finds he can't bring himself to be disappointed at all--in fact, he's been sort of hoping his first blowjob and intercourse would be two separate experiences, so he can compare and contrast them more accurately later. (Sherlock will always be something of a scientist no matter what he's doing; by now he can't help it.)

When she touches him, running her long warm fingers over sensitive skin, he lets out a quiet sigh and his eyes flutter shut.