Sherlock's not being too obvious, right?
A Difference in Semantics
"I'll bring a candle for your table, Sherlock," said Angelo as he walked away. "More romantic."
John looked at Sherlock in mild alarm. "We're not dating. This isn't a date."
Sherlock scoffed. "Oh please, John. What do you mean, 'date'?"
"A date. You know, where two people who like each other go out and have fun."
Sherlock's eyebrows knit together and he gave John a puzzled look. "That's what we're doing."
"No, it's not. At least, I hope it's not."
Sherlock stared at one of the portraits in sepia lining the walls. "Differences in semantics, I like to think."
Prompt was #68: sepia
"Semantics" is a vocab word, and definitely one of my favorites! For those who aren't familiar with the word/its uses, when Sherlock says "Differences in semantics, I like to think", he's basically saying that John's interpretation of the word "date" isn't quite Sherlock's interpretation, and by his translation of it, yes, they're on a date.