Sherlock is ignoring him, as he typically does. Mycroft can hem and haw on and on about how he's the boss, but it makes no difference to him. He'll do what he wants either way. Still, he can feel it when it happens. More he can feel the surprise from Mycroft when his command is broken.

By this human. Just a human, a human who's hardly young in years, though John isn't old either, still...

The younger Holmes will turn on his heel, looking back.

"Oh this just got interesting." There is the slightest little curve of one side of his mouth up, knowing his brother must be so very peeved by this. If not amazed as well. This just doesn't happen.

"Funny, Mycroft, it seems along with me, Doctor Watson doesn't want to listen to you either. We might get along better than I thought." Why yes, he did just say that as if he planned on taking him now.