Chameleon

"Sherlock grabbed Watson’s wrists and press them to the door on either side of his head. Pinning him. And now nothing was stopping him. He breathed deeply at his ear, then ducked his head to lick that spot right under the angle of his chin where the Guide scent was strongest. He could taste it on his tongue. Oh marvelous!" From a fic titled Chameleon.

haven't read it yet but GOD I plan to.