I forgot to include this bit but really wanted to mention it.

“You’re a parasite, Sherlock.” Mycroft’s voice, ice-cold and tight with anger, cut across Sherlock’s tirade. Sherlock closed his mouth with a snap. “Dear God in heaven, look at yourself. All that ferocious intelligence...

...

“I’m not a parasite,” Sherlock whispered.

I saw Violet from the first chapter reflected in Mycroft's words to Sherlock, and the same in Sherlock's response. Just fantastic.