[Oh, good. A topic he has no real emotional connection to. Far, far easier to talk about, and there's the subtle shift in his posture to show the slide into an easier manner of speaking. There's less strain, more presumptive arrogance.]

Well, I need some name to go under if I'm going to keep my head down in this city. People put so much meaning into names, even on internet-like networks where they've no guarantee as to the person's identity.

[...And because he's Sherlock, he'll do it whether Mycroft is there or not. Really, despite his mun's own plotting, he feels it would be far easier to get away with if Mycroft isn't there to say something to contradict what he was doing under his name.

He's more than capable of functioning without someone looking out for him.]