He does tilt his head slightly, eyeing Sebastian suspiciously. "Unless, it's some sort of operation in which I'm assisting the police. Trying to look for a suspect in particular for a crime, to prove a point." It would have been a wonderful reason, if it had been true and it wasn't.
He finally takes the money, slipping it into a small lock box before getting up from the chair he'd been in behind the booth. "I suppose I'll take that as a compliment, Moran." Sherlock smooths his shirt before taking initative to kiss him over the booth's tabletop.