Where do you two consider "home" to be?
Holmes: Oh, dear.
Watson: What?
Holmes: John, this is a blatant ploy to elicit a treacly sentiment from us. It's my cue to say something like "Home is wherever John is" and look at you with hearts in my eyes.
Watson: ...
Holmes: You're thinking about "hearts in my eyes" literally, aren't you?
Watson: Yes. It's very disturbing.
Holmes: I have no doubt.
Watson: Shall we give this question an actual answer?
Holmes: Oh, I suppose. We spend the most time in Los Angeles at your house.
Watson: I think it's our house by now.
Holmes: I keep a flat in London. We're there a goodish amount of time.
Watson: We have been discussing selling my house and buying or building a new one on L.A., one that would be more our home together, rather than mine which you moved into.
Holmes: This hasn't made it past the discussion phase.
Watson: Frankly, I rather dread the arguments we'd inevitably have about where to buy and what sort of house to get.
Holmes: Yes, because we never argue now, over such things as who borrowed my favorite tie and got wine on it.
Watson: Or who threw away my autographed Hitchcock script!
Holmes: Yes. Such arguments never occur in our happy bungalow of domestic bliss.
Watson. No, never.