It didn't occur to Bell that wooing was a thing that Sherlock ever did; Joan had only mentioned prostitutes once, but it was the sort of thing that stuck in Bell's memory.

But Sherlock doesn't stop texting him between cases, and even though Bell really isn't into trivia, he's starting to look forward to Sherlock's commentary on the day - his jokes about Joan, his low opinion of anyone whose brain doesn't move at the speed of lightning, his nearly incomprehensible abbreviations.

DTTKU, Sherlock sends ('do try to keep up,' a fairly frequent observation), trying to flirt w/ u, dinner 2nite?, and Bell shakes his head and hems and haws over it, but finally he texts back yes.