@54viruses and I had a conversation in this post about Mycroft having a social stand-in who talked for him so he could stay in the back room and do Mycroft things rather than deal with people. This has been burning in the back of my brain ever since, and since we're on a 12 hour car ride, I have nothing to do except write. XD
Charles Higgins steeled himself before stepping into his shared office. Though they had space for four desks, Mr. Thurston had only yet hired two clerks. Unfortunately, Mycroft Holmes's sullen silence and haughty disapproval were enough to make the wide room feel uncomfortably close. When Mr. Thurston had introduced them six weeks ago, Higgins had held out his hand in greeting, hoping that his fellow clerk would be an amiable sort. Holmes had frowned down at his hand, grunted, and then brushed past him. Since that day, they had barely spoken two words to each other despite sharing a workroom, Higgins's every attempt at friendly conversation firmly rebuffed with an impatient, impetuous wave of a hand. Higgins couldn't help but come to the conclusion that Holmes had found him wanting in some way and resented his very presence.