Yay Mike! I liked how he was done in A Study in Pink, and those little smiles he got on his face when Sherlock analyzed John with a glance. I'm not entirely sure what their relationship is, but I like to think that Mike knows Sherlock very well. I mean, he does come into Bean There several times a week, so Mike sees him a lot; he's bound to learn a little about his customers. But more than that, it was implied that they talked often.
Innocent Until Proven Guilty
Mike, one of John's classmates who also part-timed at Bean There, leaned against the counter when there was a break in customers. "What did you do to piss off Sherlock Holmes?"
"Who?"
"The tall one with the suit and dark hair," Mike supplied, glancing over at the window seat. John followed his gaze, taking in the silver-haired man with him. They were speaking in low voices, poring over folders and photographs. The one called Sherlock was having what he'd ordered yesterday- Earl Grey tea and a white chocolate biscuit.
"So, what did you do?"
"I have no idea."
Prompt was #95: silver