Topher was used to cold smiles being sent his way; he wasn't much of a people person and didn't try to hide that fact, something that bothered more that a few people. This didn't mean that the smile he shot at Sherlock was just as cold. No, Topher's grin was genuine, mostly because he was talking to Sherlock-freaking-Holmes.

"Right." He leaned in and lowered his voice. "Can't you deduce my answer?"