Sherlock's shoulders stiffened. It was enough to draw his attention away from John's mobile, at the very least. "Yeeeeees?" He held onto his mug with both hands, almost defensively, and narrowed his eyes a bit at the man across from him. "We work from home, and if you begin writing more in earnest, you'll need an office for yourself. I imagine Harry wouldn't object to her own rooms, and it ... reminded me of Baker Street." He braced himself for John's disapproval, not because he expected it from the man, but because Sherlock was conditioned to think he was always upsetting everyone around him — even when he tried not to.