It's a pity that Sherlock needed Mycroft's help at all; by going to him it implied that he was forgiven, and after his betrayal (the worst kind possible) Mycroft doesn't deserve even the hope of being forgiven or redeemed. He willingly betrayed the one person he claimed to care about (and with all of his manipulations in his life that really is a terrible lie to have spoken), he never deserves to lose the guilt he feels.

Well, that's... Decent. So what does CH3COOH in the title got to do with any of the story?

Excellent! You've got Mycroft spot on. Keep going I want to know what's next.

Please continue! :)

OY. I am so over the "it's all Mycroft's fault" POV in this fandom.