He shakes his head at that. (It will always be his business. Someone needs to keep an eye on Sherlock, John is the best candidate. If he leaves who else would fill that gap?)

"Oh come now Sherlock, it is so."

Because what effected Sherlock did Mycroft. Sherlock just never seemed to understand that.

"You say that as if your memory is the best thing possible in this circumstance." Trauma, stress, while their minds were amazing, things could happen unexpectedly. And Mycroft just rounds shakes his head at that, another sip of tea. His room isn't divided into seperate rooms, easy enough to watch Sherlock as he makes breakfast. "I believe I will start trusting you as soon as you start to trust me."