But they won't let me.
They are too freakin' competent, it is ridiculous. I keep trying to put them in dangerous situations or a dramatic setting, and they just sort of deal with it in the first two paragraphs and move along. Without Sherlock there to be a source of drama to work around, they just grit their teeth and do what they need to and carry on.
I think it's because both Mycroft and Q are quiet. They make a point of not drawing attention to themselves, and deal with things without being noticed. So, where Sherlock instantly wants the attention and makes a noise and throws a spanner in the works, Mycroft and Q just get on with things, and even if they don't get along, put that aside and carry on. Which is great for them, but absolutely rubbish for a story. They are boring together, and I can't even manufacture drama.
Dammit, functional relationships!