The look in John's eyes. He knew that the man was absolutely serious. He believed John when he said it.

But his heart skipped when John said those three little words. This was so new for both of them. And it wasn't that Sherlock didn't care for him, and love him, but it was harder for him to say those little words.

"John.." He said softly. It was all he could say and he was quiet for a moment before he repeated the word. "John." What was it about this man that drove him to speechlessness? No one else in his life could render him speechless like John cold in three little words.