Appropriate

'“I was just typing this case up - ” Of course, the blog. Always the blog. “ – and I noticed the date. I moved in here exactly a year ago today, you know,” says John.

Sherlock doesn’t see how this is relevant to either their latest case, which John is currently making a complete hash of writing about, or to Sherlock’s very important experiments about fungal decay, so he merely raises an eyebrow. John looks slightly embarrassed.

“Just thought I’d point it out,” he mumbles. “I wasn’t expecting a bloody bouquet of roses or anything.”

“Good,” says Sherlock. Neither of them says anything else for a few moments, and Sherlock turns to check on the progress of his fungus.'

Or, in which Sherlock realises he has missed an important anniversary and attempts to subtly find out how to rectify the situation. Situations are rectified. Shameless fluff.